Removing unrequired APi checks (#1620)

* Removing unrequired APi checks

* Bumping min sdk to 26 and further cleaning version checks

* More clean ups

* Removed unused class

app/src/main/AndroidManifest.xml

@@ -291,10 +291,6 @@
             android:name="org.thoughtcrime.securesms.scribbles.StickerSelectActivity"
             android:configChanges="touchscreen|keyboard|keyboardHidden|orientation|screenLayout|screenSize"
             android:theme="@style/Theme.Session.ForceDark" />
-        <activity
-            android:name="com.theartofdev.edmodo.cropper.CropImageActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat" />
         <activity
             android:name="org.thoughtcrime.securesms.ShortcutLauncherActivity"
             android:configChanges="touchscreen|keyboard|keyboardHidden|orientation|screenLayout|screenSize"

app/src/main/java/org/thoughtcrime/securesms/BaseActivity.java

@@ -4,12 +4,8 @@ import android.app.ActivityManager;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
-import android.os.Build;
+
-import android.os.Build.VERSION;
-import android.os.Build.VERSION_CODES;
-import androidx.annotation.NonNull;
 import androidx.fragment.app.FragmentActivity;
-import android.view.KeyEvent;
 
 import org.session.libsession.utilities.TextSecurePreferences;
 import org.session.libsession.utilities.dynamiclanguage.DynamicLanguageActivityHelper;

app/src/main/java/org/thoughtcrime/securesms/MediaOverviewActivity.java

@@ -39,7 +39,9 @@ import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.view.ActionMode;
 import androidx.appcompat.widget.Toolbar;
+import androidx.core.content.ContextCompat;
 import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentActivity;
 import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentStatePagerAdapter;
 import androidx.loader.app.LoaderManager;
@@ -421,11 +423,13 @@ public class MediaOverviewActivity extends PassphraseRequiredActionBarActivity {
         mode.getMenuInflater().inflate(R.menu.media_overview_context, menu);
         mode.setTitle("1");
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+        FragmentActivity activity = getActivity();
-          Window window = getActivity().getWindow();
+        if (activity == null) return false;
+
+        Window window = activity.getWindow();
         originalStatusBarColor = window.getStatusBarColor();
-          window.setStatusBarColor(getResources().getColor(R.color.action_mode_status_bar));
+        window.setStatusBarColor(ContextCompat.getColor(activity, R.color.action_mode_status_bar));
-        }
+
         return true;
       }
 
@@ -455,11 +459,12 @@ public class MediaOverviewActivity extends PassphraseRequiredActionBarActivity {
       public void onDestroyActionMode(ActionMode mode) {
         actionMode = null;
         getListAdapter().clearSelection();
-        ((MediaOverviewActivity) getActivity()).onExitMultiSelect();
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+        MediaOverviewActivity activity = ((MediaOverviewActivity) getActivity());
-          getActivity().getWindow().setStatusBarColor(originalStatusBarColor);
+        if(activity == null) return;
-        }
+
+        activity.onExitMultiSelect();
+        activity.getWindow().setStatusBarColor(originalStatusBarColor);
       }
     }
   }

app/src/main/java/org/thoughtcrime/securesms/MediaPreviewActivity.java

@@ -17,7 +17,6 @@
 package org.thoughtcrime.securesms;
 
 import android.annotation.SuppressLint;
-import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.Intent;
 import android.database.Cursor;
@@ -26,7 +25,6 @@ import android.net.Uri;
 import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Build.VERSION;
-import android.os.Build.VERSION_CODES;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
@@ -57,6 +55,9 @@ import androidx.recyclerview.widget.RecyclerView;
 import androidx.viewpager.widget.PagerAdapter;
 import androidx.viewpager.widget.ViewPager;
 
+import com.bumptech.glide.Glide;
+import com.bumptech.glide.RequestManager;
+
 import org.session.libsession.messaging.messages.control.DataExtractionNotification;
 import org.session.libsession.messaging.sending_receiving.MessageSender;
 import org.session.libsession.messaging.sending_receiving.attachments.DatabaseAttachment;
@@ -72,8 +73,6 @@ import org.thoughtcrime.securesms.database.loaders.PagingMediaLoader;
 import org.thoughtcrime.securesms.database.model.MmsMessageRecord;
 import org.thoughtcrime.securesms.mediapreview.MediaPreviewViewModel;
 import org.thoughtcrime.securesms.mediapreview.MediaRailAdapter;
-import com.bumptech.glide.Glide;
-import com.bumptech.glide.RequestManager;
 import org.thoughtcrime.securesms.mms.Slide;
 import org.thoughtcrime.securesms.permissions.Permissions;
 import org.thoughtcrime.securesms.util.AttachmentUtil;

app/src/main/java/org/thoughtcrime/securesms/audio/AudioCodec.java

@@ -1,22 +1,19 @@
 package org.thoughtcrime.securesms.audio;
 
-import android.annotation.TargetApi;
 import android.media.AudioFormat;
 import android.media.AudioRecord;
 import android.media.MediaCodec;
 import android.media.MediaCodecInfo;
 import android.media.MediaFormat;
 import android.media.MediaRecorder;
-import android.os.Build;
-import org.session.libsignal.utilities.Log;
 
 import org.session.libsession.utilities.Util;
+import org.session.libsignal.utilities.Log;
 
 import java.io.IOException;
 import java.io.OutputStream;
 import java.nio.ByteBuffer;
 
-@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
 public class AudioCodec {
 
   private static final String TAG = AudioCodec.class.getSimpleName();

app/src/main/java/org/thoughtcrime/securesms/audio/AudioSlidePlayer.java

@@ -46,7 +46,7 @@ public class AudioSlidePlayer implements SensorEventListener {
   private final @NonNull  Handler           progressEventHandler;
   private final @NonNull  AudioManager      audioManager;
   private final @NonNull  SensorManager     sensorManager;
-  private final @NonNull  Sensor            proximitySensor;
+  private final Sensor            proximitySensor;
   private final @Nullable WakeLock          wakeLock;
 
   private @NonNull  WeakReference<Listener> listener;
@@ -132,7 +132,9 @@ public class AudioSlidePlayer implements SensorEventListener {
                 mediaPlayer.seekTo((long) (mediaPlayer.getDuration() * progress));
               }
 
+              if(proximitySensor != null) {
                 sensorManager.registerListener(AudioSlidePlayer.this, proximitySensor, SensorManager.SENSOR_DELAY_NORMAL);
+              }
 
               setPlaying(AudioSlidePlayer.this);
             }

app/src/main/java/org/thoughtcrime/securesms/components/AttachmentTypeSelector.java

@@ -2,15 +2,10 @@ package org.thoughtcrime.securesms.components;
 
 import android.Manifest;
 import android.animation.Animator;
-import android.annotation.TargetApi;
 import android.app.Activity;
 import android.content.Context;
 import android.graphics.drawable.BitmapDrawable;
 import android.net.Uri;
-import android.os.Build;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.loader.app.LoaderManager;
 import android.util.Pair;
 import android.view.Gravity;
 import android.view.LayoutInflater;
@@ -26,8 +21,12 @@ import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.PopupWindow;
 
-import org.thoughtcrime.securesms.permissions.Permissions;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.loader.app.LoaderManager;
+
 import org.session.libsession.utilities.ViewUtil;
+import org.thoughtcrime.securesms.permissions.Permissions;
 
 import network.loki.messenger.R;
 
@@ -126,15 +125,10 @@ public class AttachmentTypeSelector extends PopupWindow {
       public void onGlobalLayout() {
         getContentView().getViewTreeObserver().removeGlobalOnLayoutListener(this);
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
         animateWindowInCircular(anchor, getContentView());
-        } else {
-          animateWindowInTranslate(getContentView());
-        }
       }
     });
 
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
     animateButtonIn(imageButton, ANIMATION_DURATION / 2);
     animateButtonIn(cameraButton, ANIMATION_DURATION / 2);
 
@@ -145,7 +139,6 @@ public class AttachmentTypeSelector extends PopupWindow {
     animateButtonIn(contactButton, 0);
     animateButtonIn(closeButton, 0);
   }
-  }
 
   private void updateHeight() {
     int thresholdInDP = 120;
@@ -159,11 +152,7 @@ public class AttachmentTypeSelector extends PopupWindow {
 
   @Override
   public void dismiss() {
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
     animateWindowOutCircular(currentAnchor, getContentView());
-    } else {
-      animateWindowOutTranslate(getContentView());
-    }
   }
 
   public void setListener(@Nullable AttachmentClickedListener listener) {
@@ -182,7 +171,6 @@ public class AttachmentTypeSelector extends PopupWindow {
     button.startAnimation(animation);
   }
 
-  @TargetApi(Build.VERSION_CODES.LOLLIPOP)
   private void animateWindowInCircular(@Nullable View anchor, @NonNull View contentView) {
     Pair<Integer, Integer> coordinates = getClickOrigin(anchor, contentView);
     Animator animator = ViewAnimationUtils.createCircularReveal(contentView,
@@ -201,7 +189,6 @@ public class AttachmentTypeSelector extends PopupWindow {
     getContentView().startAnimation(animation);
   }
 
-  @TargetApi(Build.VERSION_CODES.LOLLIPOP)
   private void animateWindowOutCircular(@Nullable View anchor, @NonNull View contentView) {
     Pair<Integer, Integer> coordinates = getClickOrigin(anchor, contentView);
     Animator               animator    = ViewAnimationUtils.createCircularReveal(getContentView(),

app/src/main/java/org/thoughtcrime/securesms/components/ComposeText.java

@@ -1,7 +1,6 @@
 package org.thoughtcrime.securesms.components;
 
 import android.content.Context;
-import android.os.Build;
 import android.os.Bundle;
 import android.text.InputType;
 import android.text.Spannable;
@@ -16,15 +15,14 @@ import android.view.inputmethod.InputConnection;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.annotation.RequiresApi;
 import androidx.core.os.BuildCompat;
 import androidx.core.view.inputmethod.EditorInfoCompat;
 import androidx.core.view.inputmethod.InputConnectionCompat;
 import androidx.core.view.inputmethod.InputContentInfoCompat;
 
-import org.thoughtcrime.securesms.components.emoji.EmojiEditText;
-import org.session.libsignal.utilities.Log;
 import org.session.libsession.utilities.TextSecurePreferences;
+import org.session.libsignal.utilities.Log;
+import org.thoughtcrime.securesms.components.emoji.EmojiEditText;
 
 public class ComposeText extends EmojiEditText {
 
@@ -136,7 +134,6 @@ public class ComposeText extends EmojiEditText {
             editorInfo.imeOptions &= ~EditorInfo.IME_FLAG_NO_ENTER_ACTION;
         }
 
-        if (Build.VERSION.SDK_INT < 21) return inputConnection;
         if (mediaListener == null)      return inputConnection;
         if (inputConnection == null)    return null;
 
@@ -154,7 +151,6 @@ public class ComposeText extends EmojiEditText {
         }
     }
 
-    @RequiresApi(api = Build.VERSION_CODES.HONEYCOMB_MR2)
     private static class CommitContentListener implements InputConnectionCompat.OnCommitContentListener {
 
         private static final String TAG = CommitContentListener.class.getSimpleName();

app/src/main/java/org/thoughtcrime/securesms/components/ConversationItemAlertView.java

@@ -1,9 +1,7 @@
 package org.thoughtcrime.securesms.components;
 
-import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.res.TypedArray;
-import android.os.Build.VERSION_CODES;
 import android.util.AttributeSet;
 import android.view.View;
 import android.widget.ImageView;
@@ -27,7 +25,6 @@ public class ConversationItemAlertView extends LinearLayout {
     initialize(attrs);
   }
 
-  @TargetApi(VERSION_CODES.HONEYCOMB)
   public ConversationItemAlertView(final Context context, AttributeSet attrs, int defStyle) {
     super(context, attrs, defStyle);
     initialize(attrs);

app/src/main/java/org/thoughtcrime/securesms/components/HidingLinearLayout.java

@@ -1,9 +1,6 @@
 package org.thoughtcrime.securesms.components;
 
-import android.annotation.TargetApi;
 import android.content.Context;
-import android.os.Build;
-import androidx.interpolator.view.animation.FastOutSlowInInterpolator;
 import android.util.AttributeSet;
 import android.view.animation.AlphaAnimation;
 import android.view.animation.Animation;
@@ -11,6 +8,8 @@ import android.view.animation.AnimationSet;
 import android.view.animation.ScaleAnimation;
 import android.widget.LinearLayout;
 
+import androidx.interpolator.view.animation.FastOutSlowInInterpolator;
+
 public class HidingLinearLayout extends LinearLayout {
 
   public HidingLinearLayout(Context context) {
@@ -21,7 +20,6 @@ public class HidingLinearLayout extends LinearLayout {
     super(context, attrs);
   }
 
-  @TargetApi(Build.VERSION_CODES.HONEYCOMB)
   public HidingLinearLayout(Context context, AttributeSet attrs, int defStyleAttr) {
     super(context, attrs, defStyleAttr);
   }

app/src/main/java/org/thoughtcrime/securesms/components/InputPanel.java

@@ -1,13 +1,12 @@
 package org.thoughtcrime.securesms.components;
 
-import android.annotation.TargetApi;
 import android.content.Context;
 import android.net.Uri;
-import android.os.Build;
-import androidx.annotation.NonNull;
 import android.util.AttributeSet;
 import android.widget.LinearLayout;
 
+import androidx.annotation.NonNull;
+
 public class InputPanel extends LinearLayout {
 
     public InputPanel(Context context) {
@@ -18,7 +17,6 @@ public class InputPanel extends LinearLayout {
         super(context, attrs);
     }
 
-    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
     public InputPanel(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
     }

app/src/main/java/org/thoughtcrime/securesms/components/KeyboardAwareLinearLayout.java

@@ -16,26 +16,25 @@
  */
 package org.thoughtcrime.securesms.components;
 
-import android.annotation.TargetApi;
 import android.content.Context;
 import android.graphics.Rect;
-import android.os.Build;
-import android.os.Build.VERSION_CODES;
 import android.preference.PreferenceManager;
-import androidx.appcompat.widget.LinearLayoutCompat;
 import android.util.AttributeSet;
-import org.session.libsignal.utilities.Log;
 import android.view.Surface;
 import android.view.View;
 
-import network.loki.messenger.R;
+import androidx.appcompat.widget.LinearLayoutCompat;
+
 import org.session.libsession.utilities.ServiceUtil;
 import org.session.libsession.utilities.Util;
+import org.session.libsignal.utilities.Log;
 
 import java.lang.reflect.Field;
 import java.util.HashSet;
 import java.util.Set;
 
+import network.loki.messenger.R;
+
 /**
  * LinearLayout that, when a view container, will report back when it thinks a soft keyboard
  * has been opened and what its height would be.
@@ -95,7 +94,7 @@ public class KeyboardAwareLinearLayout extends LinearLayoutCompat {
   }
 
   private void updateKeyboardState() {
-    if (viewInset == 0 && Build.VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) viewInset = getViewInset();
+    if (viewInset == 0) viewInset = getViewInset();
 
     getWindowVisibleDisplayFrame(rect);
 
@@ -118,7 +117,6 @@ public class KeyboardAwareLinearLayout extends LinearLayoutCompat {
     }
   }
 
-  @TargetApi(VERSION_CODES.LOLLIPOP)
   private int getViewInset() {
     try {
       Field attachInfoField = View.class.getDeclaredField("mAttachInfo");

app/src/main/java/org/thoughtcrime/securesms/components/MediaView.java

@@ -3,24 +3,24 @@ package org.thoughtcrime.securesms.components;
 
 import android.content.Context;
 import android.net.Uri;
-import android.os.Build;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.annotation.RequiresApi;
 import android.util.AttributeSet;
 import android.view.View;
 import android.view.Window;
 import android.widget.FrameLayout;
 
-import network.loki.messenger.R;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
 import com.bumptech.glide.RequestManager;
+
+import org.session.libsession.utilities.Stub;
 import org.thoughtcrime.securesms.mms.VideoSlide;
 import org.thoughtcrime.securesms.video.VideoPlayer;
 
-import org.session.libsession.utilities.Stub;
-
 import java.io.IOException;
 
+import network.loki.messenger.R;
+
 public class MediaView extends FrameLayout {
 
   private ZoomingImageView  imageView;
@@ -41,12 +41,6 @@ public class MediaView extends FrameLayout {
     initialize();
   }
 
-  @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
-  public MediaView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
-    super(context, attrs, defStyleAttr, defStyleRes);
-    initialize();
-  }
-
   private void initialize() {
     inflate(getContext(), R.layout.media_view, this);
 

app/src/main/java/org/thoughtcrime/securesms/components/RecentPhotoViewRail.java

@@ -1,19 +1,11 @@
 package org.thoughtcrime.securesms.components;
 
 
-import android.annotation.TargetApi;
 import android.content.Context;
 import android.database.Cursor;
 import android.net.Uri;
 import android.os.Bundle;
 import android.provider.MediaStore;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.loader.app.LoaderManager;
-import androidx.loader.content.Loader;
-import androidx.recyclerview.widget.DefaultItemAnimator;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -21,16 +13,24 @@ import android.view.ViewGroup;
 import android.widget.FrameLayout;
 import android.widget.ImageView;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.loader.app.LoaderManager;
+import androidx.loader.content.Loader;
+import androidx.recyclerview.widget.DefaultItemAnimator;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.bumptech.glide.Glide;
 import com.bumptech.glide.load.Key;
 import com.bumptech.glide.load.engine.DiskCacheStrategy;
 import com.bumptech.glide.signature.MediaStoreSignature;
 
-import network.loki.messenger.R;
+import org.session.libsession.utilities.ViewUtil;
 import org.thoughtcrime.securesms.database.CursorRecyclerViewAdapter;
 import org.thoughtcrime.securesms.database.loaders.RecentPhotosLoader;
-import com.bumptech.glide.Glide;
 
-import org.session.libsession.utilities.ViewUtil;
+import network.loki.messenger.R;
 
 public class RecentPhotoViewRail extends FrameLayout implements LoaderManager.LoaderCallbacks<Cursor> {
 
@@ -130,14 +130,12 @@ public class RecentPhotoViewRail extends FrameLayout implements LoaderManager.Lo
 
     }
 
-    @TargetApi(16)
     @SuppressWarnings("SuspiciousNameCombination")
     private String getWidthColumn(int orientation) {
       if (orientation == 0 || orientation == 180) return MediaStore.Images.ImageColumns.WIDTH;
       else                                        return MediaStore.Images.ImageColumns.HEIGHT;
     }
 
-    @TargetApi(16)
     @SuppressWarnings("SuspiciousNameCombination")
     private String getHeightColumn(int orientation) {
       if (orientation == 0 || orientation == 180) return MediaStore.Images.ImageColumns.HEIGHT;

app/src/main/java/org/thoughtcrime/securesms/components/SearchToolbar.java

@@ -94,15 +94,11 @@ public class SearchToolbar extends LinearLayout {
 
       searchItem.expandActionView();
 
-      if (Build.VERSION.SDK_INT >= 21) {
       Animator animator = ViewAnimationUtils.createCircularReveal(this, (int)x, (int)y, 0, getWidth());
       animator.setDuration(400);
 
       setVisibility(View.VISIBLE);
       animator.start();
-      } else {
-        setVisibility(View.VISIBLE);
-      }
     }
   }
 
@@ -116,7 +112,6 @@ public class SearchToolbar extends LinearLayout {
 
       if (listener != null) listener.onSearchClosed();
 
-      if (Build.VERSION.SDK_INT >= 21) {
       Animator animator = ViewAnimationUtils.createCircularReveal(this, (int)x, (int)y, getWidth(), 0);
       animator.setDuration(400);
       animator.addListener(new AnimationCompleteListener() {
@@ -126,9 +121,6 @@ public class SearchToolbar extends LinearLayout {
         }
       });
       animator.start();
-      } else {
-        setVisibility(View.INVISIBLE);
-      }
     }
   }
 

app/src/main/java/org/thoughtcrime/securesms/components/SquareFrameLayout.java

@@ -1,10 +1,7 @@
 package org.thoughtcrime.securesms.components;
 
-import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.res.TypedArray;
-import android.graphics.BitmapFactory;
-import android.os.Build.VERSION_CODES;
 import android.util.AttributeSet;
 import android.widget.FrameLayout;
 
@@ -24,7 +21,7 @@ public class SquareFrameLayout extends FrameLayout {
     this(context, attrs, 0);
   }
 
-  @TargetApi(VERSION_CODES.HONEYCOMB) @SuppressWarnings("unused")
+  @SuppressWarnings("unused")
   public SquareFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
     super(context, attrs, defStyleAttr);
 

app/src/main/java/org/thoughtcrime/securesms/components/camera/CameraView.java

@@ -15,7 +15,6 @@
 
 package org.thoughtcrime.securesms.components.camera;
 
-import android.annotation.TargetApi;
 import android.app.Activity;
 import android.content.Context;
 import android.content.pm.ActivityInfo;
@@ -28,26 +27,26 @@ import android.hardware.Camera.Parameters;
 import android.hardware.Camera.Size;
 import android.os.AsyncTask;
 import android.os.Build;
-import android.os.Build.VERSION;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
 import android.util.AttributeSet;
-import org.session.libsignal.utilities.Log;
 import android.view.OrientationEventListener;
 import android.view.ViewGroup;
 
-import network.loki.messenger.R;
+import androidx.annotation.NonNull;
-import org.thoughtcrime.securesms.util.BitmapUtil;
+import androidx.annotation.Nullable;
-import org.session.libsignal.utilities.guava.Optional;
 
 import org.session.libsession.utilities.TextSecurePreferences;
 import org.session.libsession.utilities.Util;
+import org.session.libsignal.utilities.Log;
+import org.session.libsignal.utilities.guava.Optional;
+import org.thoughtcrime.securesms.util.BitmapUtil;
 
 import java.io.IOException;
 import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
 
+import network.loki.messenger.R;
+
 @SuppressWarnings("deprecation")
 public class CameraView extends ViewGroup {
   private static final String TAG = CameraView.class.getSimpleName();
@@ -91,7 +90,6 @@ public class CameraView extends ViewGroup {
     addView(surface);
   }
 
-  @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
   public void onResume() {
     if (state != State.PAUSED) return;
     state = State.RESUMED;
@@ -255,26 +253,9 @@ public class CameraView extends ViewGroup {
     return Camera.getNumberOfCameras() > 1;
   }
 
-  public boolean isRearCamera() {
-    return cameraId == CameraInfo.CAMERA_FACING_BACK;
-  }
-
-  public void flipCamera() {
-    if (Camera.getNumberOfCameras() > 1) {
-      cameraId = cameraId == CameraInfo.CAMERA_FACING_BACK
-                 ? CameraInfo.CAMERA_FACING_FRONT
-                 : CameraInfo.CAMERA_FACING_BACK;
-      onPause();
-      onResume();
-      TextSecurePreferences.setDirectCaptureCameraId(getContext(), cameraId);
-    }
-  }
-
-  @TargetApi(14)
   private void onCameraReady(final @NonNull Camera camera) {
     final Parameters parameters = camera.getParameters();
 
-    if (VERSION.SDK_INT >= 14) {
     parameters.setRecordingHint(true);
     final List<String> focusModes = parameters.getSupportedFocusModes();
     if (focusModes.contains(Parameters.FOCUS_MODE_CONTINUOUS_PICTURE)) {
@@ -282,7 +263,6 @@ public class CameraView extends ViewGroup {
     } else if (focusModes.contains(Parameters.FOCUS_MODE_CONTINUOUS_VIDEO)) {
       parameters.setFocusMode(Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
     }
-    }
 
     displayOrientation = CameraUtils.getCameraDisplayOrientation(getActivity(), getCameraInfo());
     camera.setDisplayOrientation(displayOrientation);
@@ -465,7 +445,7 @@ public class CameraView extends ViewGroup {
     }
     final float newWidth  = visibleRect.width()  * scale;
     final float newHeight = visibleRect.height() * scale;
-    final float centerX   = (VERSION.SDK_INT < 14 || isTroublemaker()) ? previewWidth - newWidth / 2 : previewWidth / 2;
+    final float centerX   = (isTroublemaker()) ? previewWidth - newWidth / 2 : previewWidth / 2;
     final float centerY   = previewHeight / 2;
 
     visibleRect.set((int) (centerX - newWidth  / 2),

app/src/main/java/org/thoughtcrime/securesms/conversation/v2/Util.kt

@@ -16,15 +16,9 @@
  */
 package org.thoughtcrime.securesms.conversation.v2
 
-import android.annotation.TargetApi
-import android.app.ActivityManager
-import android.content.ClipData
-import android.content.ClipboardManager
 import android.content.Context
 import android.graphics.Typeface
 import android.net.Uri
-import android.os.Build.VERSION
-import android.os.Build.VERSION_CODES
 import android.text.Spannable
 import android.text.SpannableString
 import android.text.TextUtils
@@ -33,22 +27,16 @@ import android.view.View
 import com.annimon.stream.Stream
 import com.google.android.mms.pdu_alt.CharacterSets
 import com.google.android.mms.pdu_alt.EncodedStringValue
-import network.loki.messenger.R
 import org.session.libsignal.utilities.Log
 import org.thoughtcrime.securesms.components.ComposeText
 import java.io.ByteArrayOutputStream
 import java.io.IOException
 import java.io.UnsupportedEncodingException
 import java.util.Collections
-import java.util.concurrent.TimeUnit
-import kotlin.math.max
-import kotlin.math.min
 
 object Util {
     private val TAG: String = Log.tag(Util::class.java)
 
-    private val BUILD_LIFESPAN = TimeUnit.DAYS.toMillis(90)
-
     fun <T> asList(vararg elements: T): List<T> {
         val result = mutableListOf<T>() // LinkedList()
         Collections.addAll(result, *elements)
@@ -104,19 +92,6 @@ object Util {
         return sb.toString()
     }
 
-    fun rightPad(value: String, length: Int): String {
-        if (value.length >= length) {
-            return value
-        }
-
-        val out = StringBuilder(value)
-        while (out.length < length) {
-            out.append(" ")
-        }
-
-        return out.toString()
-    }
-
     fun isEmpty(value: Array<EncodedStringValue?>?): Boolean {
         return value == null || value.size == 0
     }
@@ -133,64 +108,6 @@ object Util {
         return charSequence == null || charSequence.length == 0
     }
 
-    fun hasItems(collection: Collection<*>?): Boolean {
-        return collection != null && !collection.isEmpty()
-    }
-
-    fun <K, V> getOrDefault(map: Map<K, V>, key: K, defaultValue: V): V? {
-        return if (map.containsKey(key)) map[key] else defaultValue
-    }
-
-    fun getFirstNonEmpty(vararg values: String?): String {
-        for (value in values) {
-            if (!value.isNullOrEmpty()) { return value }
-        }
-        return ""
-    }
-
-    fun emptyIfNull(value: String?): String {
-        return value ?: ""
-    }
-
-    fun emptyIfNull(value: CharSequence?): CharSequence {
-        return value ?: ""
-    }
-
-    fun getBoldedString(value: String?): CharSequence {
-        val spanned = SpannableString(value)
-        spanned.setSpan(
-            StyleSpan(Typeface.BOLD), 0,
-            spanned.length,
-            Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
-        )
-
-        return spanned
-    }
-
-    fun toIsoString(bytes: ByteArray?): String {
-        try {
-            return String(bytes!!, charset(CharacterSets.MIMENAME_ISO_8859_1))
-        } catch (e: UnsupportedEncodingException) {
-            throw AssertionError("ISO_8859_1 must be supported!")
-        }
-    }
-
-    fun toIsoBytes(isoString: String): ByteArray {
-        try {
-            return isoString.toByteArray(charset(CharacterSets.MIMENAME_ISO_8859_1))
-        } catch (e: UnsupportedEncodingException) {
-            throw AssertionError("ISO_8859_1 must be supported!")
-        }
-    }
-
-    fun toUtf8Bytes(utf8String: String): ByteArray {
-        try {
-            return utf8String.toByteArray(charset(CharacterSets.MIMENAME_UTF_8))
-        } catch (e: UnsupportedEncodingException) {
-            throw AssertionError("UTF_8 must be supported!")
-        }
-    }
-
     fun wait(lock: Any, timeout: Long) {
         try {
             (lock as Object).wait(timeout)
@@ -225,20 +142,6 @@ object Util {
         return parts
     }
 
-    fun combine(vararg elements: ByteArray?): ByteArray {
-        try {
-            val baos = ByteArrayOutputStream()
-
-            for (element in elements) {
-                baos.write(element)
-            }
-
-            return baos.toByteArray()
-        } catch (e: IOException) {
-            throw AssertionError(e)
-        }
-    }
-
     fun trim(input: ByteArray?, length: Int): ByteArray {
         val result = ByteArray(length)
         System.arraycopy(input, 0, result, 0, result.size)
@@ -251,26 +154,6 @@ object Util {
         else Uri.parse(uri)
     }
 
-    @TargetApi(VERSION_CODES.KITKAT)
-    fun isLowMemory(context: Context): Boolean {
-        val activityManager = context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
-
-        return (VERSION.SDK_INT >= VERSION_CODES.KITKAT && activityManager.isLowRamDevice) ||
-                activityManager.largeMemoryClass <= 64
-    }
-
-    fun clamp(value: Int, min: Int, max: Int): Int {
-        return min(max(value.toDouble(), min.toDouble()), max.toDouble()).toInt()
-    }
-
-    fun clamp(value: Long, min: Long, max: Long): Long {
-        return min(max(value.toDouble(), min.toDouble()), max.toDouble()).toLong()
-    }
-
-    fun clamp(value: Float, min: Float, max: Float): Float {
-        return min(max(value.toDouble(), min.toDouble()), max.toDouble()).toFloat()
-    }
-
     /**
      * Returns half of the difference between the given length, and the length when scaled by the
      * given scale.
@@ -280,74 +163,6 @@ object Util {
         return (length - scaledLength) / 2
     }
 
-    fun readTextFromClipboard(context: Context): String? {
-        run {
-            val clipboardManager =
-                context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
-            return if (clipboardManager.hasPrimaryClip() && clipboardManager.primaryClip!!.itemCount > 0) {
-                clipboardManager.primaryClip!!.getItemAt(0).text.toString()
-            } else {
-                null
-            }
-        }
-    }
-
-    fun writeTextToClipboard(context: Context, text: String) {
-        writeTextToClipboard(context, context.getString(R.string.app_name), text)
-    }
-
-    fun writeTextToClipboard(context: Context, label: String, text: String) {
-        val clipboard = context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
-        val clip = ClipData.newPlainText(label, text)
-        clipboard.setPrimaryClip(clip)
-    }
-
-    fun toIntExact(value: Long): Int {
-        if (value.toInt().toLong() != value) {
-            throw ArithmeticException("integer overflow")
-        }
-        return value.toInt()
-    }
-
-    fun isEquals(first: Long?, second: Long): Boolean {
-        return first != null && first == second
-    }
-
-    @SafeVarargs
-    fun <T> concatenatedList(vararg items: Collection<T>): List<T> {
-        val concat: MutableList<T> = ArrayList(
-            Stream.of(*items).reduce(0) { sum: Int, list: Collection<T> -> sum + list.size })
-
-        for (list in items) {
-            concat.addAll(list)
-        }
-
-        return concat
-    }
-
-    fun isLong(value: String): Boolean {
-        try {
-            value.toLong()
-            return true
-        } catch (e: NumberFormatException) {
-            return false
-        }
-    }
-
-    fun parseInt(integer: String, defaultValue: Int): Int {
-        return try {
-            integer.toInt()
-        } catch (e: NumberFormatException) {
-            defaultValue
-        }
-    }
-
-    // Method to determine if we're currently in a left-to-right or right-to-left language like Arabic
-    fun usingRightToLeftLanguage(context: Context): Boolean {
-        val config = context.resources.configuration
-        return config.layoutDirection == View.LAYOUT_DIRECTION_RTL
-    }
-
     // Method to determine if we're currently in a left-to-right or right-to-left language like Arabic
     fun usingLeftToRightLanguage(context: Context): Boolean {
         val config = context.resources.configuration

app/src/main/java/org/thoughtcrime/securesms/conversation/v2/input_bar/InputBarButton.kt

@@ -148,11 +148,8 @@ class InputBarButton : RelativeLayout {
 
     private fun onDown(event: MotionEvent) {
         expand()
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
         performHapticFeedback(HapticFeedbackConstants.CONTEXT_CLICK)
-        } else {
+
-            performHapticFeedback(HapticFeedbackConstants.LONG_PRESS)
-        }
         longPressCallback?.let { gestureHandler.removeCallbacks(it) }
         val newLongPressCallback = Runnable { onLongPress?.invoke() }
         this.longPressCallback = newLongPressCallback

app/src/main/java/org/thoughtcrime/securesms/conversation/v2/input_bar/InputBarEditText.kt

@@ -3,7 +3,6 @@ package org.thoughtcrime.securesms.conversation.v2.input_bar
 import android.content.Context
 import android.content.res.Resources
 import android.net.Uri
-import android.os.Build
 import android.util.AttributeSet
 import android.view.inputmethod.EditorInfo
 import android.view.inputmethod.InputConnection
@@ -57,7 +56,7 @@ class InputBarEditText : AppCompatEditText {
                 InputConnectionCompat.OnCommitContentListener { inputContentInfo, flags, opts ->
                     val lacksPermission = (flags and InputConnectionCompat.INPUT_CONTENT_GRANT_READ_URI_PERMISSION) != 0
                     // read and display inputContentInfo asynchronously
-                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1 && lacksPermission) {
+                    if (lacksPermission) {
                         try {
                             inputContentInfo.requestPermission()
                         } catch (e: Exception) {

app/src/main/java/org/thoughtcrime/securesms/crypto/AttachmentSecretProvider.java

@@ -59,9 +59,6 @@ public class AttachmentSecretProvider {
   {
     AttachmentSecret attachmentSecret = AttachmentSecret.fromString(unencryptedSecret);
 
-    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
-      return attachmentSecret;
-    } else {
     KeyStoreHelper.SealedData encryptedSecret = KeyStoreHelper.seal(attachmentSecret.serialize().getBytes());
 
     TextSecurePreferences.setAttachmentEncryptedSecret(context, encryptedSecret.serialize());
@@ -69,16 +66,11 @@ public class AttachmentSecretProvider {
 
     return attachmentSecret;
   }
-  }
 
   private AttachmentSecret getEncryptedAttachmentSecret(@NonNull String serializedEncryptedSecret) {
-    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
-      throw new AssertionError("OS downgrade not supported. KeyStore sealed data exists on platform < M!");
-    } else {
     KeyStoreHelper.SealedData encryptedSecret = KeyStoreHelper.SealedData.fromString(serializedEncryptedSecret);
     return AttachmentSecret.fromString(new String(KeyStoreHelper.unseal(encryptedSecret)));
   }
-  }
 
   private AttachmentSecret createAndStoreAttachmentSecret(@NonNull Context context) {
     byte[]       secret = new byte[32];
@@ -91,12 +83,8 @@ public class AttachmentSecretProvider {
   }
 
   private void storeAttachmentSecret(@NonNull Context context, @NonNull AttachmentSecret attachmentSecret) {
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
     KeyStoreHelper.SealedData encryptedSecret = KeyStoreHelper.seal(attachmentSecret.serialize().getBytes());
     TextSecurePreferences.setAttachmentEncryptedSecret(context, encryptedSecret.serialize());
-    } else {
-      TextSecurePreferences.setAttachmentUnencryptedSecret(context, attachmentSecret.serialize());
-    }
   }
 
 }

app/src/main/java/org/thoughtcrime/securesms/crypto/BiometricSecretProvider.kt

@@ -42,9 +42,8 @@ class BiometricSecretProvider {
             builder.setUnlockedDeviceRequired(true)
         }
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
         builder.setInvalidatedByBiometricEnrollment(true)
-        }
+
         keyGenerator.initialize(builder.build())
         keyGenerator.generateKeyPair()
     }

app/src/main/java/org/thoughtcrime/securesms/crypto/DatabaseSecretProvider.java

@@ -36,29 +36,21 @@ public class DatabaseSecretProvider {
     try {
       DatabaseSecret databaseSecret = new DatabaseSecret(unencryptedSecret);
 
-      if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
-        return databaseSecret;
-      } else {
       KeyStoreHelper.SealedData encryptedSecret = KeyStoreHelper.seal(databaseSecret.asBytes());
 
       TextSecurePreferences.setDatabaseEncryptedSecret(context, encryptedSecret.serialize());
       TextSecurePreferences.setDatabaseUnencryptedSecret(context, null);
 
       return databaseSecret;
-      }
     } catch (IOException e) {
       throw new AssertionError(e);
     }
   }
 
   private DatabaseSecret getEncryptedDatabaseSecret(@NonNull String serializedEncryptedSecret) {
-    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
-      throw new AssertionError("OS downgrade not supported. KeyStore sealed data exists on platform < M!");
-    } else {
     KeyStoreHelper.SealedData encryptedSecret = KeyStoreHelper.SealedData.fromString(serializedEncryptedSecret);
     return new DatabaseSecret(KeyStoreHelper.unseal(encryptedSecret));
   }
-  }
 
   private DatabaseSecret createAndStoreDatabaseSecret(@NonNull Context context) {
     byte[]       secret = new byte[32];
@@ -66,12 +58,8 @@ public class DatabaseSecretProvider {
 
     DatabaseSecret databaseSecret = new DatabaseSecret(secret);
 
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
     KeyStoreHelper.SealedData encryptedSecret = KeyStoreHelper.seal(databaseSecret.asBytes());
     TextSecurePreferences.setDatabaseEncryptedSecret(context, encryptedSecret.serialize());
-    } else {
-      TextSecurePreferences.setDatabaseUnencryptedSecret(context, databaseSecret.asString());
-    }
 
     return databaseSecret;
   }

app/src/main/java/org/thoughtcrime/securesms/crypto/IdentityKeyUtil.java

@@ -129,9 +129,6 @@ public class IdentityKeyUtil {
   }
 
   private static String getUnencryptedSecret(String key, String unencryptedSecret, Context context) {
-    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
-      return unencryptedSecret;
-    } else {
     KeyStoreHelper.SealedData encryptedSecret = KeyStoreHelper.seal(unencryptedSecret.getBytes());
 
     // save the encrypted suffix secret "key_encrypted"
@@ -141,23 +138,17 @@ public class IdentityKeyUtil {
 
     return unencryptedSecret;
   }
-  }
 
   private static String getEncryptedSecret(String encryptedSecret) {
-    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
-      throw new AssertionError("OS downgrade not supported. KeyStore sealed data exists on platform < M!");
-    } else {
     KeyStoreHelper.SealedData sealedData = KeyStoreHelper.SealedData.fromString(encryptedSecret);
     return new String(KeyStoreHelper.unseal(sealedData));
   }
-  }
 
 
   public static void save(Context context, String key, String value) {
     SharedPreferences preferences   = context.getSharedPreferences(MASTER_SECRET_UTIL_PREFERENCES_NAME, 0);
     Editor preferencesEditor        = preferences.edit();
 
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
     boolean isEncryptedSuffix = key.endsWith(ENCRYPTED_SUFFIX);
     if (isEncryptedSuffix) {
       preferencesEditor.putString(key, value);
@@ -165,9 +156,7 @@ public class IdentityKeyUtil {
       KeyStoreHelper.SealedData encryptedSecret = KeyStoreHelper.seal(value.getBytes());
       preferencesEditor.putString(key+ENCRYPTED_SUFFIX, encryptedSecret.serialize());
     }
-    } else {
+
-      preferencesEditor.putString(key, value);
-    }
     if (!preferencesEditor.commit()) throw new AssertionError("failed to save identity key/value to shared preferences");
   }
 

app/src/main/java/org/thoughtcrime/securesms/database/AttachmentDatabase.java

@@ -966,11 +966,6 @@ public class AttachmentDatabase extends Database {
 
     @SuppressLint("NewApi")
     private ThumbnailData generateVideoThumbnail(AttachmentId attachmentId) {
-      if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
-        Log.w(TAG, "Video thumbnails not supported...");
-        return null;
-      }
-
       DataInfo dataInfo = getAttachmentDataFileInfo(attachmentId, DATA);
 
       if (dataInfo == null) {

app/src/main/java/org/thoughtcrime/securesms/database/helpers/SQLCipherOpenHelper.java

@@ -252,11 +252,9 @@ public class SQLCipherOpenHelper extends SQLiteOpenHelper {
       NotificationManager notificationManager = context.getSystemService(NotificationManager.class);
       String channelId = context.getString(R.string.NotificationChannel_failures);
 
-      if (NotificationChannels.supported()) {
       NotificationChannel channel = new NotificationChannel(channelId, channelId, NotificationManager.IMPORTANCE_HIGH);
       channel.enableVibration(true);
       notificationManager.createNotificationChannel(channel);
-      }
 
       NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId)
         .setSmallIcon(R.drawable.ic_notification)
@@ -266,10 +264,6 @@ public class SQLCipherOpenHelper extends SQLiteOpenHelper {
         .setContentText(context.getString(R.string.ErrorNotifier_migration_downgrade))
         .setAutoCancel(true);
 
-      if (!NotificationChannels.supported()) {
-        builder.setPriority(NotificationCompat.PRIORITY_HIGH);
-      }
-
       notificationManager.notify(5874, builder.build());
 
       // Throw the error (app will crash but there is nothing else we can do unfortunately)

app/src/main/java/org/thoughtcrime/securesms/home/PathActivity.kt

@@ -15,6 +15,7 @@ import android.widget.RelativeLayout
 import android.widget.TextView
 import android.widget.Toast
 import androidx.annotation.ColorRes
+import androidx.core.content.ContextCompat
 import androidx.localbroadcastmanager.content.LocalBroadcastManager
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
@@ -38,7 +39,6 @@ import org.thoughtcrime.securesms.util.disableClipping
 import org.thoughtcrime.securesms.util.fadeIn
 import org.thoughtcrime.securesms.util.fadeOut
 import org.thoughtcrime.securesms.util.getAccentColor
-import org.thoughtcrime.securesms.util.getColorWithID
 
 class PathActivity : PassphraseRequiredActionBarActivity() {
     private lateinit var binding: ActivityPathBinding
@@ -283,7 +283,7 @@ class PathActivity : PassphraseRequiredActionBarActivity() {
         private fun expand() {
             dotView.animateSizeChange(R.dimen.path_row_dot_size, R.dimen.path_row_expanded_dot_size)
             @ColorRes val startColorID = if (UiModeUtilities.isDayUiMode(context)) R.color.transparent_black_30 else R.color.black
-            val startColor = context.resources.getColorWithID(startColorID, context.theme)
+            val startColor = ContextCompat.getColor(context, startColorID)
             val endColor = context.getAccentColor()
             GlowViewUtilities.animateShadowColorChange(dotView, startColor, endColor)
         }
@@ -292,7 +292,7 @@ class PathActivity : PassphraseRequiredActionBarActivity() {
             dotView.animateSizeChange(R.dimen.path_row_expanded_dot_size, R.dimen.path_row_dot_size)
             @ColorRes val endColorID = if (UiModeUtilities.isDayUiMode(context)) R.color.transparent_black_30 else R.color.black
             val startColor = context.getAccentColor()
-            val endColor = context.resources.getColorWithID(endColorID, context.theme)
+            val endColor = ContextCompat.getColor(context, endColorID)
             GlowViewUtilities.animateShadowColorChange(dotView, startColor, endColor)
         }
 

app/src/main/java/org/thoughtcrime/securesms/home/PathStatusView.kt

@@ -9,6 +9,7 @@ import android.graphics.Paint
 import android.util.AttributeSet
 import android.view.View
 import androidx.annotation.ColorInt
+import androidx.core.content.ContextCompat
 import androidx.lifecycle.coroutineScope
 import androidx.localbroadcastmanager.content.LocalBroadcastManager
 import kotlinx.coroutines.Dispatchers
@@ -17,7 +18,6 @@ import kotlinx.coroutines.withContext
 import network.loki.messenger.R
 import org.session.libsession.snode.OnionRequestAPI
 import org.thoughtcrime.securesms.conversation.v2.ViewUtil
-import org.thoughtcrime.securesms.util.getColorWithID
 import org.thoughtcrime.securesms.util.toPx
 
 class PathStatusView : View {
@@ -104,7 +104,7 @@ class PathStatusView : View {
                     sessionShadowColor = hasPathsColor
                 } else {
                     setBackgroundResource(R.drawable.paths_building_dot)
-                    val pathsBuildingColor = resources.getColorWithID(R.color.paths_building, context.theme)
+                    val pathsBuildingColor = ContextCompat.getColor(context, R.color.paths_building)
                     mainColor = pathsBuildingColor
                     sessionShadowColor = pathsBuildingColor
                 }

app/src/main/java/org/thoughtcrime/securesms/jobmanager/Constraint.java

@@ -8,11 +8,6 @@ public interface Constraint {
 
   boolean isMet();
 
-  @NonNull String getFactoryKey();
-
-  @RequiresApi(26)
-  void applyToJobInfo(@NonNull JobInfo.Builder jobInfoBuilder);
-
   interface Factory<T extends Constraint> {
     T create();
   }

app/src/main/java/org/thoughtcrime/securesms/jobmanager/impl/NetworkConstraint.java

@@ -28,17 +28,6 @@ public class NetworkConstraint implements Constraint {
     return activeNetworkInfo != null && activeNetworkInfo.isConnected();
   }
 
-  @Override
-  public @NonNull String getFactoryKey() {
-    return KEY;
-  }
-
-  @RequiresApi(26)
-  @Override
-  public void applyToJobInfo(@NonNull JobInfo.Builder jobInfoBuilder) {
-    jobInfoBuilder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY);
-  }
-
   public static final class Factory implements Constraint.Factory<NetworkConstraint> {
 
     private final Application application;

app/src/main/java/org/thoughtcrime/securesms/logging/LogSecretProvider.java

@@ -32,24 +32,16 @@ class LogSecretProvider {
   }
 
   private static byte[] parseEncryptedSecret(String secret) {
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
     KeyStoreHelper.SealedData encryptedSecret = KeyStoreHelper.SealedData.fromString(secret);
     return KeyStoreHelper.unseal(encryptedSecret);
-    } else {
-      throw new AssertionError("OS downgrade not supported. KeyStore sealed data exists on platform < M!");
-    }
   }
 
   private static byte[] createAndStoreSecret(@NonNull Context context) {
     byte[]       secret = new byte[32];
     SECURE_RANDOM.nextBytes(secret);
 
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
     KeyStoreHelper.SealedData encryptedSecret = KeyStoreHelper.seal(secret);
     TextSecurePreferences.setLogEncryptedSecret(context, encryptedSecret.serialize());
-    } else {
-      TextSecurePreferences.setLogUnencryptedSecret(context, Base64.encodeBytes(secret));
-    }
 
     return secret;
   }

app/src/main/java/org/thoughtcrime/securesms/mediasend/MediaRepository.java

@@ -1,6 +1,5 @@
 package org.thoughtcrime.securesms.mediasend;
 
-import android.annotation.TargetApi;
 import android.content.Context;
 import android.database.Cursor;
 import android.net.Uri;
@@ -200,14 +199,12 @@ class MediaRepository {
     }).toList();
   }
 
-  @TargetApi(16)
   @SuppressWarnings("SuspiciousNameCombination")
   private String getWidthColumn(int orientation) {
     if (orientation == 0 || orientation == 180) return Images.Media.WIDTH;
     else                                        return Images.Media.HEIGHT;
   }
 
-  @TargetApi(16)
   @SuppressWarnings("SuspiciousNameCombination")
   private String getHeightColumn(int orientation) {
     if (orientation == 0 || orientation == 180) return Images.Media.HEIGHT;

app/src/main/java/org/thoughtcrime/securesms/notifications/AbstractNotificationBuilder.java

@@ -50,8 +50,8 @@ public abstract class AbstractNotificationBuilder extends NotificationCompat.Bui
   }
 
   public void setAlarms(@Nullable Uri ringtone, VibrateState vibrate) {
-    Uri     defaultRingtone = NotificationChannels.supported() ? NotificationChannels.getMessageRingtone(context) : TextSecurePreferences.getNotificationRingtone(context);
+    Uri     defaultRingtone = NotificationChannels.getMessageRingtone(context);
-    boolean defaultVibrate  = NotificationChannels.supported() ? NotificationChannels.getMessageVibrate(context)  : TextSecurePreferences.isNotificationVibrateEnabled(context);
+    boolean defaultVibrate  = NotificationChannels.getMessageVibrate(context);
 
     if      (ringtone == null && !TextUtils.isEmpty(defaultRingtone.toString())) setSound(defaultRingtone);
     else if (ringtone != null && !ringtone.toString().isEmpty())                 setSound(ringtone);

app/src/main/java/org/thoughtcrime/securesms/notifications/MultipleRecipientNotificationBuilder.java

@@ -37,10 +37,6 @@ public class MultipleRecipientNotificationBuilder extends AbstractNotificationBu
     setContentIntent(PendingIntent.getActivity(context, 0, new Intent(context, HomeActivity.class), PendingIntent.FLAG_IMMUTABLE));
     setCategory(NotificationCompat.CATEGORY_MESSAGE);
     setGroupSummary(true);
-
-    if (!NotificationChannels.supported()) {
-      setPriority(TextSecurePreferences.getNotificationPriority(context));
-    }
   }
 
   public void setMessageCount(int messageCount, int threadCount) {

app/src/main/java/org/thoughtcrime/securesms/notifications/NotificationChannels.java

@@ -1,15 +1,12 @@
 package org.thoughtcrime.securesms.notifications;
 
-import android.annotation.TargetApi;
 import android.app.NotificationChannel;
 import android.app.NotificationChannelGroup;
 import android.app.NotificationManager;
 import android.content.Context;
-import android.content.Intent;
 import android.media.AudioAttributes;
 import android.net.Uri;
 import android.os.AsyncTask;
-import android.os.Build;
 import android.provider.Settings;
 import android.text.TextUtils;
 
@@ -24,7 +21,6 @@ import org.session.libsession.utilities.Address;
 import org.session.libsession.utilities.ServiceUtil;
 import org.session.libsession.utilities.TextSecurePreferences;
 import org.session.libsession.utilities.recipients.Recipient;
-import org.session.libsession.utilities.recipients.Recipient.VibrateState;
 import org.session.libsignal.utilities.Log;
 import org.thoughtcrime.securesms.database.RecipientDatabase;
 import org.thoughtcrime.securesms.dependencies.DatabaseComponent;
@@ -63,10 +59,6 @@ public class NotificationChannels {
    * ignored for API < 26.
    */
   public static synchronized void create(@NonNull Context context) {
-    if (!supported()) {
-      return;
-    }
-
     NotificationManager notificationManager = ServiceUtil.getNotificationManager(context);
 
     int oldVersion = TextSecurePreferences.getNotificationChannelVersion(context);
@@ -82,32 +74,6 @@ public class NotificationChannels {
     });
   }
 
-  /**
-   * Recreates all notification channels for contacts with custom notifications enabled. Should be
-   * safe to call repeatedly. Needs to be executed on a background thread.
-   */
-  @WorkerThread
-  public static synchronized void restoreContactNotificationChannels(@NonNull Context context) {
-    if (!NotificationChannels.supported()) {
-      return;
-    }
-
-    RecipientDatabase db = DatabaseComponent.get(context).recipientDatabase();
-
-    try (RecipientDatabase.RecipientReader reader = db.getRecipientsWithNotificationChannels()) {
-      Recipient recipient;
-      while ((recipient = reader.getNext()) != null) {
-        NotificationManager notificationManager = ServiceUtil.getNotificationManager(context);
-        if (!channelExists(notificationManager.getNotificationChannel(recipient.getNotificationChannel()))) {
-          String id = createChannelFor(context, recipient);
-          db.setNotificationChannel(recipient, id);
-        }
-      }
-    }
-
-    ensureCustomChannelConsistency(context);
-  }
-
   /**
    * @return The channel ID for the default messages channel.
    */
@@ -115,13 +81,6 @@ public class NotificationChannels {
     return getMessagesChannelId(TextSecurePreferences.getNotificationMessagesChannelVersion(context));
   }
 
-  /**
-   * @return Whether or not notification channels are supported.
-   */
-  public static boolean supported() {
-    return Build.VERSION.SDK_INT >= 26;
-  }
-
   /**
    * @return A name suitable to be displayed as the notification channel title.
    */
@@ -137,119 +96,18 @@ public class NotificationChannels {
     }
   }
 
-  /**
-   * Creates a channel for the specified recipient.
-   * @return The channel ID for the newly-created channel.
-   */
-  public static synchronized String createChannelFor(@NonNull Context context, @NonNull Recipient recipient) {
-    VibrateState vibrateState     = recipient.getMessageVibrate();
-    boolean      vibrationEnabled = vibrateState == VibrateState.DEFAULT ? TextSecurePreferences.isNotificationVibrateEnabled(context) : vibrateState == VibrateState.ENABLED;
-    Uri          messageRingtone  = recipient.getMessageRingtone() != null ? recipient.getMessageRingtone() : getMessageRingtone(context);
-    String       displayName      = getChannelDisplayNameFor(context, recipient.getName(), recipient.getProfileName(), recipient.getAddress());
 
-    return createChannelFor(context, recipient.getAddress(), displayName, messageRingtone, vibrationEnabled);
-  }
 
-  /**
-   * More verbose version of {@link #createChannelFor(Context, Recipient)}.
-   */
-  public static synchronized  @Nullable String createChannelFor(@NonNull Context context,
-                                                                @NonNull Address address,
-                                                                @NonNull String displayName,
-                                                                @Nullable Uri messageSound,
-                                                                boolean vibrationEnabled)
-  {
-    if (!supported()) {
-      return null;
-    }
-
-    String              channelId = generateChannelIdFor(address);
-    NotificationChannel channel   = new NotificationChannel(channelId, displayName, NotificationManager.IMPORTANCE_HIGH);
-
-    setLedPreference(channel, TextSecurePreferences.getNotificationLedColor(context));
-    channel.setGroup(CATEGORY_MESSAGES);
-    channel.enableVibration(vibrationEnabled);
-
-    if (messageSound != null) {
-      channel.setSound(messageSound, new AudioAttributes.Builder().setContentType(AudioAttributes.CONTENT_TYPE_UNKNOWN)
-                                                                  .setUsage(AudioAttributes.USAGE_NOTIFICATION_COMMUNICATION_INSTANT)
-                                                                  .build());
-    }
-
-    NotificationManager notificationManager = ServiceUtil.getNotificationManager(context);
-    notificationManager.createNotificationChannel(channel);
-
-    return channelId;
-  }
-
-  /**
-   * Deletes the channel generated for the provided recipient. Safe to call even if there was never
-   * a channel made for that recipient.
-   */
-  public static synchronized void deleteChannelFor(@NonNull Context context, @NonNull Recipient recipient) {
-    if (!supported()) {
-      return;
-    }
-
-    NotificationManager notificationManager = ServiceUtil.getNotificationManager(context);
-    String              channel             = recipient.getNotificationChannel();
-
-    if (channel != null) {
-      Log.i(TAG, "Deleting channel");
-      notificationManager.deleteNotificationChannel(channel);
-    }
-  }
-
-  /**
-   * Navigates the user to the system settings for the desired notification channel.
-   */
-  public static void openChannelSettings(@NonNull Context context, @NonNull String channelId) {
-    if (!supported()) {
-      return;
-    }
-
-    Intent intent = new Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS);
-    intent.putExtra(Settings.EXTRA_CHANNEL_ID, channelId);
-    intent.putExtra(Settings.EXTRA_APP_PACKAGE, context.getPackageName());
-    context.startActivity(intent);
-  }
-
-  /**
-   * Updates the LED color for message notifications and all contact-specific message notification
-   * channels. Performs database operations and should therefore be invoked on a background thread.
-   */
-  @WorkerThread
-  public static synchronized void updateMessagesLedColor(@NonNull Context context, @NonNull Integer color) {
-    if (!supported()) {
-      return;
-    }
-    Log.i(TAG, "Updating LED color.");
-
-    NotificationManager notificationManager = ServiceUtil.getNotificationManager(context);
-
-    updateMessageChannel(context, channel -> setLedPreference(channel, color));
-    updateAllRecipientChannelLedColors(context, notificationManager, color);
-
-    ensureCustomChannelConsistency(context);
-  }
 
   /**
    * @return The message ringtone set for the default message channel.
    */
   public static synchronized @NonNull Uri getMessageRingtone(@NonNull Context context) {
-    if (!supported()) {
-      return Uri.EMPTY;
-    }
-
     Uri sound = ServiceUtil.getNotificationManager(context).getNotificationChannel(getMessagesChannel(context)).getSound();
     return sound == null ? Uri.EMPTY : sound;
   }
 
   public static synchronized @Nullable Uri getMessageRingtone(@NonNull Context context, @NonNull Recipient recipient) {
-    if (!supported() || recipient.getNotificationChannel() == null) {
-      return null;
-    }
-
     NotificationManager notificationManager = ServiceUtil.getNotificationManager(context);
     NotificationChannel channel             = notificationManager.getNotificationChannel(recipient.getNotificationChannel());
 
@@ -265,9 +123,6 @@ public class NotificationChannels {
    * Update the message ringtone for the default message channel.
    */
   public static synchronized void updateMessageRingtone(@NonNull Context context, @Nullable Uri uri) {
-    if (!supported()) {
-      return;
-    }
     Log.i(TAG, "Updating default message ringtone with URI: " + String.valueOf(uri));
 
     updateMessageChannel(context, channel -> {
@@ -275,121 +130,23 @@ public class NotificationChannels {
     });
   }
 
-  /**
-   * Updates the message ringtone for a specific recipient. If that recipient has no channel, this
-   * does nothing.
-   *
-   * This has to update the database, and therefore should be run on a background thread.
-   */
-  @WorkerThread
-  public static synchronized void updateMessageRingtone(@NonNull Context context, @NonNull Recipient recipient, @Nullable Uri uri) {
-    if (!supported() || recipient.getNotificationChannel() == null) {
-      return;
-    }
-    Log.i(TAG, "Updating recipient message ringtone with URI: " + String.valueOf(uri));
-
-    String  newChannelId = generateChannelIdFor(recipient.getAddress());
-    boolean success      = updateExistingChannel(ServiceUtil.getNotificationManager(context),
-                                                 recipient.getNotificationChannel(),
-                                                 generateChannelIdFor(recipient.getAddress()),
-                                                 channel -> channel.setSound(uri == null ? Settings.System.DEFAULT_NOTIFICATION_URI : uri, getRingtoneAudioAttributes()));
-
-    DatabaseComponent.get(context).recipientDatabase().setNotificationChannel(recipient, success ? newChannelId : null);
-    ensureCustomChannelConsistency(context);
-  }
 
   /**
    * @return The vibrate settings for the default message channel.
    */
   public static synchronized boolean getMessageVibrate(@NonNull Context context) {
-    if (!supported()) {
-      return false;
-    }
-
     return ServiceUtil.getNotificationManager(context).getNotificationChannel(getMessagesChannel(context)).shouldVibrate();
   }
 
-  /**
-   * @return The vibrate setting for a specific recipient. If that recipient has no channel, this
-   *         will return the setting for the default message channel.
-   */
-  public static synchronized boolean getMessageVibrate(@NonNull Context context, @NonNull Recipient recipient) {
-    if (!supported()) {
-      return getMessageVibrate(context);
-    }
-
-    NotificationManager notificationManager = ServiceUtil.getNotificationManager(context);
-    NotificationChannel channel             = notificationManager.getNotificationChannel(recipient.getNotificationChannel());
-
-    if (!channelExists(channel)) {
-      Log.w(TAG, "Recipient didn't have a channel. Returning message default.");
-      return getMessageVibrate(context);
-    }
-
-    return channel.shouldVibrate();
-  }
-
   /**
    * Sets the vibrate property for the default message channel.
    */
   public static synchronized void updateMessageVibrate(@NonNull Context context, boolean enabled) {
-    if (!supported()) {
-      return;
-    }
     Log.i(TAG, "Updating default vibrate with value: " + enabled);
 
     updateMessageChannel(context, channel -> channel.enableVibration(enabled));
   }
 
-  /**
-   * Updates the message ringtone for a specific recipient. If that recipient has no channel, this
-   * does nothing.
-   *
-   * This has to update the database and should therefore be run on a background thread.
-   */
-  @WorkerThread
-  public static synchronized void updateMessageVibrate(@NonNull Context context, @NonNull Recipient recipient, VibrateState vibrateState) {
-    if (!supported() || recipient.getNotificationChannel() == null) {
-      return ;
-    }
-    Log.i(TAG, "Updating recipient vibrate with value: " + vibrateState);
-
-    boolean enabled      = vibrateState == VibrateState.DEFAULT ? getMessageVibrate(context) : vibrateState == VibrateState.ENABLED;
-    String  newChannelId = generateChannelIdFor(recipient.getAddress());
-    boolean success      = updateExistingChannel(ServiceUtil.getNotificationManager(context),
-                                                 recipient.getNotificationChannel(),
-                                                 newChannelId,
-                                                 channel -> channel.enableVibration(enabled));
-
-    DatabaseComponent.get(context).recipientDatabase().setNotificationChannel(recipient, success ? newChannelId : null);
-    ensureCustomChannelConsistency(context);
-  }
-
-  /**
-   * Updates the name of an existing channel to match the recipient's current name. Will have no
-   * effect if the recipient doesn't have an existing valid channel.
-   */
-  public static synchronized void updateContactChannelName(@NonNull Context context, @NonNull Recipient recipient) {
-    if (!supported() || recipient.getNotificationChannel() == null) {
-      return;
-    }
-    Log.i(TAG, "Updating contact channel name");
-
-    NotificationManager notificationManager = ServiceUtil.getNotificationManager(context);
-
-    if (notificationManager.getNotificationChannel(recipient.getNotificationChannel()) == null) {
-      Log.w(TAG, "Tried to update the name of a channel, but that channel doesn't exist.");
-      return;
-    }
-
-    NotificationChannel channel = new NotificationChannel(recipient.getNotificationChannel(),
-                                                          getChannelDisplayNameFor(context, recipient.getName(), recipient.getProfileName(), recipient.getAddress()),
-                                                          NotificationManager.IMPORTANCE_HIGH);
-    channel.setGroup(CATEGORY_MESSAGES);
-    notificationManager.createNotificationChannel(channel);
-  }
-
-  @TargetApi(26)
   @WorkerThread
   public static synchronized void ensureCustomChannelConsistency(@NonNull Context context) {
     NotificationManager notificationManager = ServiceUtil.getNotificationManager(context);
@@ -421,7 +178,6 @@ public class NotificationChannels {
     }
   }
 
-  @TargetApi(26)
   private static void onCreate(@NonNull Context context, @NonNull NotificationManager notificationManager) {
     NotificationChannelGroup messagesGroup = new NotificationChannelGroup(CATEGORY_MESSAGES, context.getResources().getString(R.string.NotificationChannel_group_messages));
     notificationManager.createNotificationChannelGroup(messagesGroup);
@@ -454,7 +210,6 @@ public class NotificationChannels {
     }
   }
 
-  @TargetApi(26)
   private static void onUpgrade(@NonNull NotificationManager notificationManager, int oldVersion, int newVersion) {
     Log.i(TAG, "Upgrading channels from " + oldVersion + " to " + newVersion);
 
@@ -469,7 +224,6 @@ public class NotificationChannels {
     }
   }
 
-  @TargetApi(26)
   private static void setLedPreference(@NonNull NotificationChannel channel, @NonNull Integer ledColor) {
     if ("none".equals(ledColor)) {
       channel.enableLights(false);
@@ -484,7 +238,6 @@ public class NotificationChannels {
     return CONTACT_PREFIX + address.serialize() + "_" + System.currentTimeMillis();
   }
 
-  @TargetApi(26)
   private static @NonNull NotificationChannel copyChannel(@NonNull NotificationChannel original, @NonNull String id) {
     NotificationChannel copy = new NotificationChannel(id, original.getName(), original.getImportance());
 
@@ -505,27 +258,7 @@ public class NotificationChannels {
     return MESSAGES_PREFIX + version;
   }
 
-  @WorkerThread
-  @TargetApi(26)
-  private static void updateAllRecipientChannelLedColors(@NonNull Context context, @NonNull NotificationManager notificationManager, @NonNull Integer color) {
-    RecipientDatabase database = DatabaseComponent.get(context).recipientDatabase();
 
-    try (RecipientDatabase.RecipientReader recipients = database.getRecipientsWithNotificationChannels()) {
-      Recipient recipient;
-      while ((recipient = recipients.getNext()) != null) {
-        assert recipient.getNotificationChannel() != null;
-
-        String  newChannelId = generateChannelIdFor(recipient.getAddress());
-        boolean success      = updateExistingChannel(notificationManager, recipient.getNotificationChannel(), newChannelId, channel -> setLedPreference(channel, color));
-
-        database.setNotificationChannel(recipient, success ? newChannelId : null);
-      }
-    }
-
-    ensureCustomChannelConsistency(context);
-  }
-
-  @TargetApi(26)
   private static void updateMessageChannel(@NonNull Context context, @NonNull ChannelUpdater updater) {
     NotificationManager notificationManager = ServiceUtil.getNotificationManager(context);
     int existingVersion                     = TextSecurePreferences.getNotificationMessagesChannelVersion(context);
@@ -539,7 +272,6 @@ public class NotificationChannels {
     }
   }
 
-  @TargetApi(26)
   private static boolean updateExistingChannel(@NonNull NotificationManager notificationManager,
                                                @NonNull String channelId,
                                                @NonNull String newChannelId,
@@ -559,20 +291,17 @@ public class NotificationChannels {
     return true;
   }
 
-  @TargetApi(21)
   private static AudioAttributes getRingtoneAudioAttributes() {
     return new AudioAttributes.Builder().setContentType(AudioAttributes.CONTENT_TYPE_UNKNOWN)
         .setUsage(AudioAttributes.USAGE_NOTIFICATION_COMMUNICATION_INSTANT)
         .build();
   }
 
-  @TargetApi(26)
   private static boolean channelExists(@Nullable NotificationChannel channel) {
     return channel != null && !NotificationChannel.DEFAULT_CHANNEL_ID.equals(channel.getId());
   }
 
   private interface ChannelUpdater {
-    @TargetApi(26)
     void update(@NonNull NotificationChannel channel);
   }
 }

app/src/main/java/org/thoughtcrime/securesms/notifications/NotificationState.java

@@ -51,8 +51,7 @@ public class NotificationState {
       Recipient recipient = notifications.getFirst().getRecipient();
 
       if (recipient != null) {
-        return NotificationChannels.supported() ? NotificationChannels.getMessageRingtone(context, recipient)
+        return NotificationChannels.getMessageRingtone(context, recipient);
-                                                : recipient.resolve().getMessageRingtone();
       }
     }
 

app/src/main/java/org/thoughtcrime/securesms/notifications/PendingMessageNotificationBuilder.java

@@ -32,9 +32,5 @@ public class PendingMessageNotificationBuilder extends AbstractNotificationBuild
     setContentIntent(PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_IMMUTABLE));
     setAutoCancel(true);
     setAlarms(null, Recipient.VibrateState.DEFAULT);
-
-    if (!NotificationChannels.supported()) {
-      setPriority(TextSecurePreferences.getNotificationPriority(context));
-    }
   }
 }

app/src/main/java/org/thoughtcrime/securesms/notifications/SingleRecipientNotificationBuilder.java

@@ -13,7 +13,6 @@ import android.graphics.Rect;
 import android.graphics.RectF;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
-import android.os.Build;
 import android.text.SpannableStringBuilder;
 
 import androidx.annotation.NonNull;
@@ -24,11 +23,10 @@ import androidx.core.app.NotificationCompat.Action;
 import androidx.core.app.RemoteInput;
 import androidx.core.content.ContextCompat;
 
+import com.bumptech.glide.Glide;
 import com.bumptech.glide.load.engine.DiskCacheStrategy;
 
-import org.session.libsession.avatars.ContactColors;
 import org.session.libsession.avatars.ContactPhoto;
-import org.session.libsession.avatars.ResourceContactPhoto;
 import org.session.libsession.messaging.contacts.Contact;
 import org.session.libsession.utilities.NotificationPrivacyPreference;
 import org.session.libsession.utilities.TextSecurePreferences;
@@ -38,7 +36,6 @@ import org.session.libsignal.utilities.Log;
 import org.thoughtcrime.securesms.database.SessionContactDatabase;
 import org.thoughtcrime.securesms.dependencies.DatabaseComponent;
 import org.thoughtcrime.securesms.mms.DecryptableStreamUriLoader;
-import com.bumptech.glide.Glide;
 import org.thoughtcrime.securesms.mms.Slide;
 import org.thoughtcrime.securesms.mms.SlideDeck;
 import org.thoughtcrime.securesms.util.AvatarPlaceholderGenerator;
@@ -69,10 +66,6 @@ public class SingleRecipientNotificationBuilder extends AbstractNotificationBuil
     setSmallIcon(R.drawable.ic_notification);
     setColor(ContextCompat.getColor(context, R.color.accent_green));
     setCategory(NotificationCompat.CATEGORY_MESSAGE);
-
-    if (!NotificationChannels.supported()) {
-      setPriority(TextSecurePreferences.getNotificationPriority(context));
-    }
   }
 
   public void setThread(@NonNull Recipient recipient) {
@@ -179,13 +172,11 @@ public class SingleRecipientNotificationBuilder extends AbstractNotificationBuil
 
       Action replyAction = new Action(R.drawable.ic_reply_white_36dp, actionName, quickReplyIntent);
 
-      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
       replyAction = new Action.Builder(R.drawable.ic_reply_white_36dp,
               actionName,
               wearableReplyIntent)
               .addRemoteInput(new RemoteInput.Builder(DefaultMessageNotifier.EXTRA_REMOTE_REPLY).setLabel(label).build())
               .build();
-      }
 
       Action wearableReplyAction = new Action.Builder(R.drawable.ic_reply,
               actionName,

app/src/main/java/org/thoughtcrime/securesms/permissions/Permissions.java

@@ -210,15 +210,8 @@ public class Permissions {
                  .toArray(new String[0]);
   }
 
-  public static boolean hasAny(@NonNull Context context, String... permissions) {
-    return Build.VERSION.SDK_INT < Build.VERSION_CODES.M ||
-        Stream.of(permissions).anyMatch(permission -> ContextCompat.checkSelfPermission(context, permission) == PackageManager.PERMISSION_GRANTED);
-
-  }
-
   public static boolean hasAll(@NonNull Context context, String... permissions) {
-    return Build.VERSION.SDK_INT < Build.VERSION_CODES.M ||
+    return Stream.of(permissions).allMatch(permission -> ContextCompat.checkSelfPermission(context, permission) == PackageManager.PERMISSION_GRANTED);
-        Stream.of(permissions).allMatch(permission -> ContextCompat.checkSelfPermission(context, permission) == PackageManager.PERMISSION_GRANTED);
 
   }
 

app/src/main/java/org/thoughtcrime/securesms/preferences/NotificationsPreferenceFragment.kt

@@ -56,14 +56,14 @@ class NotificationsPreferenceFragment : ListSummaryPreferenceFragment() {
 
                 true
             }
-        if (NotificationChannels.supported()) {
+
         prefs.setNotificationRingtone(
             NotificationChannels.getMessageRingtone(requireContext()).toString()
         )
         prefs.setNotificationVibrateEnabled(
             NotificationChannels.getMessageVibrate(requireContext())
         )
-        }
+
         findPreference<Preference>(TextSecurePreferences.RINGTONE_PREF)!!.onPreferenceChangeListener = RingtoneSummaryListener()
         findPreference<Preference>(TextSecurePreferences.NOTIFICATION_PRIVACY_PREF)!!.onPreferenceChangeListener = NotificationPrivacyListener()
         findPreference<Preference>(TextSecurePreferences.VIBRATE_PREF)!!.onPreferenceChangeListener =
@@ -99,7 +99,7 @@ class NotificationsPreferenceFragment : ListSummaryPreferenceFragment() {
                 true
             }
         initializeListSummary(findPreference<Preference>(TextSecurePreferences.NOTIFICATION_PRIVACY_PREF) as ListPreference?)
-        if (NotificationChannels.supported()) {
+
         findPreference<Preference>(TextSecurePreferences.NOTIFICATION_PRIORITY_PREF)!!.onPreferenceClickListener =
             Preference.OnPreferenceClickListener {
                 val intent = Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS)
@@ -110,7 +110,7 @@ class NotificationsPreferenceFragment : ListSummaryPreferenceFragment() {
                 startActivity(intent)
                 true
             }
-        }
+
         initializeRingtoneSummary(findPreference(TextSecurePreferences.RINGTONE_PREF))
         initializeMessageVibrateSummary(findPreference<Preference>(TextSecurePreferences.VIBRATE_PREF) as SwitchPreferenceCompat?)
     }

app/src/main/java/org/thoughtcrime/securesms/preferences/PrivacySettingsPreferenceFragment.kt

@@ -78,14 +78,9 @@ class PrivacySettingsPreferenceFragment : ListSummaryPreferenceFragment() {
                 title(R.string.CallNotificationBuilder_system_notification_title)
                 text(R.string.CallNotificationBuilder_system_notification_message)
                 button(R.string.activity_notification_settings_title) {
-                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                     Intent(Settings.ACTION_APP_NOTIFICATION_SETTINGS)
                         .putExtra(Settings.EXTRA_APP_PACKAGE, BuildConfig.APPLICATION_ID)
-                    } else {
+                        .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
-                        Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
-                            .setData(Uri.parse("package:" + BuildConfig.APPLICATION_ID))
-                    }
-                        .apply { addFlags(Intent.FLAG_ACTIVITY_NEW_TASK) }
                         .takeIf { IntentUtils.isResolvable(requireContext(), it) }.let {
                         startActivity(it)
                     }

app/src/main/java/org/thoughtcrime/securesms/preferences/SettingsActivity.kt

@@ -7,7 +7,6 @@ import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
 import android.net.Uri
-import android.os.Build
 import android.os.Bundle
 import android.os.Parcelable
 import android.util.SparseArray
@@ -210,7 +209,7 @@ class SettingsActivity : PassphraseRequiredActionBarActivity() {
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         menuInflater.inflate(R.menu.settings_general, menu)
-        if (BuildConfig.DEBUG && Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+        if (BuildConfig.DEBUG) {
             menu.findItem(R.id.action_qr_code)?.contentDescription = resources.getString(R.string.AccessibilityId_view_qr_code)
         }
         return true

app/src/main/java/org/thoughtcrime/securesms/preferences/widgets/SignalListPreference.java

@@ -2,14 +2,12 @@ package org.thoughtcrime.securesms.preferences.widgets;
 
 
 import android.content.Context;
-import android.os.Build;
-import androidx.annotation.RequiresApi;
-import androidx.preference.ListPreference;
-import androidx.preference.Preference;
-import androidx.preference.PreferenceViewHolder;
 import android.util.AttributeSet;
 import android.widget.TextView;
 
+import androidx.preference.ListPreference;
+import androidx.preference.PreferenceViewHolder;
+
 import network.loki.messenger.R;
 
 public class SignalListPreference extends ListPreference {
@@ -18,13 +16,11 @@ public class SignalListPreference extends ListPreference {
   private CharSequence              summary;
   private OnPreferenceClickListener clickListener;
 
-  @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
   public SignalListPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
     super(context, attrs, defStyleAttr, defStyleRes);
     initialize();
   }
 
-  @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
   public SignalListPreference(Context context, AttributeSet attrs, int defStyleAttr) {
     super(context, attrs, defStyleAttr);
     initialize();

app/src/main/java/org/thoughtcrime/securesms/scribbles/widget/VerticalSlideColorPicker.java

@@ -23,7 +23,6 @@
 package org.thoughtcrime.securesms.scribbles.widget;
 
 
-import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.res.TypedArray;
 import android.graphics.Bitmap;
@@ -34,7 +33,6 @@ import android.graphics.Paint;
 import android.graphics.Path;
 import android.graphics.RectF;
 import android.graphics.Shader;
-import android.os.Build;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.view.View;
@@ -98,12 +96,6 @@ public class VerticalSlideColorPicker extends View {
     init();
   }
 
-  @TargetApi(Build.VERSION_CODES.LOLLIPOP)
-  public VerticalSlideColorPicker(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
-    super(context, attrs, defStyleAttr, defStyleRes);
-    init();
-  }
-
   private void init() {
     setWillNotDraw(false);
 

app/src/main/java/org/thoughtcrime/securesms/util/DateUtils.java

@@ -18,17 +18,15 @@ package org.thoughtcrime.securesms.util;
 
 import android.annotation.SuppressLint;
 import android.content.Context;
+import android.text.format.DateFormat;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
-import android.os.Build;
-import android.text.format.DateFormat;
-
 import org.session.libsignal.utilities.Log;
 
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
-import java.util.Calendar;
 import java.util.Date;
 import java.util.Locale;
 import java.util.concurrent.TimeUnit;
@@ -127,11 +125,7 @@ public class DateUtils extends android.text.format.DateUtils {
   @SuppressLint("ObsoleteSdkInt")
   public static long parseIso8601(@Nullable String date) {
     SimpleDateFormat format;
-    if (Build.VERSION.SDK_INT >= 24) {
     format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssX", Locale.getDefault());
-    } else {
-      format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ", Locale.getDefault());
-    }
 
     if (date.isEmpty()) {
       return -1;

app/src/main/java/org/thoughtcrime/securesms/util/FileProviderUtil.java

@@ -14,10 +14,7 @@ public class FileProviderUtil {
   private static final String AUTHORITY = "network.loki.securesms.fileprovider";
 
   public static Uri getUriFor(@NonNull Context context, @NonNull File file) {
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
     return FileProvider.getUriForFile(context, AUTHORITY, file);
-    else
-      return Uri.fromFile(file);
   }
 
   public static boolean delete(@NonNull Context context, @NonNull Uri uri) {

app/src/main/java/org/thoughtcrime/securesms/util/GeneralUtilities.kt

@@ -1,20 +1,9 @@
 package org.thoughtcrime.securesms.util
 
 import android.content.res.Resources
-import android.os.Build
-import androidx.annotation.ColorRes
 import androidx.recyclerview.widget.RecyclerView
-import kotlin.math.max
 import kotlin.math.roundToInt
 
-fun Resources.getColorWithID(@ColorRes id: Int, theme: Resources.Theme?): Int {
-    return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-        getColor(id, theme)
-    } else {
-        @Suppress("DEPRECATION") getColor(id)
-    }
-}
-
 fun toPx(dp: Int, resources: Resources): Int {
     return toPx(dp.toFloat(), resources).roundToInt()
 }

app/src/main/java/org/thoughtcrime/securesms/util/GlowView.kt

@@ -11,7 +11,6 @@ import android.view.animation.AccelerateDecelerateInterpolator
 import android.widget.LinearLayout
 import android.widget.RelativeLayout
 import androidx.annotation.ColorInt
-import androidx.annotation.ColorRes
 import network.loki.messenger.R
 import kotlin.math.roundToInt
 
@@ -22,18 +21,6 @@ interface GlowView {
 
 object GlowViewUtilities {
 
-    fun animateColorIdChange(context: Context, view: GlowView, @ColorRes startColorID: Int, @ColorRes endColorID: Int) {
-        val startColor = context.resources.getColorWithID(startColorID, context.theme)
-        val endColor = context.resources.getColorWithID(endColorID, context.theme)
-        val animation = ValueAnimator.ofObject(ArgbEvaluator(), startColor, endColor)
-        animation.duration = 250
-        animation.addUpdateListener { animator ->
-            val color = animator.animatedValue as Int
-            view.mainColor = color
-        }
-        animation.start()
-    }
-
     fun animateColorChange(view: GlowView, @ColorInt startColor: Int, @ColorInt endColor: Int) {
         val animation = ValueAnimator.ofObject(ArgbEvaluator(), startColor, endColor)
         animation.duration = 250
@@ -44,18 +31,6 @@ object GlowViewUtilities {
         animation.start()
     }
 
-    fun animateShadowColorIdChange(context: Context, view: GlowView, @ColorRes startColorID: Int, @ColorRes endColorID: Int) {
-        val startColor = context.resources.getColorWithID(startColorID, context.theme)
-        val endColor = context.resources.getColorWithID(endColorID, context.theme)
-        val animation = ValueAnimator.ofObject(ArgbEvaluator(), startColor, endColor)
-        animation.duration = 250
-        animation.addUpdateListener { animator ->
-            val color = animator.animatedValue as Int
-            view.sessionShadowColor = color
-        }
-        animation.start()
-    }
-
     fun animateShadowColorChange(
         view: GlowView,
         @ColorInt startColor: Int,

app/src/main/java/org/thoughtcrime/securesms/util/LongClickCopySpan.java

@@ -1,74 +0,0 @@
-package org.thoughtcrime.securesms.util;
-
-import android.annotation.TargetApi;
-import android.content.ClipData;
-import android.content.Context;
-import androidx.annotation.ColorInt;
-import androidx.annotation.NonNull;
-import android.text.TextPaint;
-import android.text.style.URLSpan;
-import android.view.View;
-import android.widget.Toast;
-
-import network.loki.messenger.R;
-
-public class LongClickCopySpan extends URLSpan {
-  private static final String PREFIX_MAILTO = "mailto:";
-  private static final String PREFIX_TEL = "tel:";
-
-  private boolean isHighlighted;
-  @ColorInt
-  private int highlightColor;
-
-  public LongClickCopySpan(String url) {
-    super(url);
-  }
-
-  void onLongClick(View widget) {
-    Context context = widget.getContext();
-    String preparedUrl = prepareUrl(getURL());
-    copyUrl(context, preparedUrl);
-    Toast.makeText(context,
-            context.getString(R.string.ConversationItem_copied_text, preparedUrl), Toast.LENGTH_SHORT).show();
-  }
-
-  @Override
-  public void updateDrawState(@NonNull TextPaint ds) {
-    super.updateDrawState(ds);
-    ds.bgColor = highlightColor;
-    ds.setUnderlineText(!isHighlighted);
-  }
-
-  void setHighlighted(boolean highlighted, @ColorInt int highlightColor) {
-    this.isHighlighted = highlighted;
-    this.highlightColor = highlightColor;
-  }
-
-  private void copyUrl(Context context, String url) {
-    int sdk = android.os.Build.VERSION.SDK_INT;
-    if (sdk < android.os.Build.VERSION_CODES.HONEYCOMB) {
-      @SuppressWarnings("deprecation") android.text.ClipboardManager clipboard =
-              (android.text.ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
-      clipboard.setText(url);
-    } else {
-      copyUriSdk11(context, url);
-    }
-  }
-
-  @TargetApi(android.os.Build.VERSION_CODES.HONEYCOMB)
-  private void copyUriSdk11(Context context, String url) {
-    android.content.ClipboardManager clipboard =
-            (android.content.ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
-    ClipData clip = ClipData.newPlainText(context.getString(R.string.app_name), url);
-    clipboard.setPrimaryClip(clip);
-  }
-
-  private String prepareUrl(String url) {
-    if (url.startsWith(PREFIX_MAILTO)) {
-      return url.substring(PREFIX_MAILTO.length());
-    } else if (url.startsWith(PREFIX_TEL)) {
-      return url.substring(PREFIX_TEL.length());
-    }
-    return url;
-  }
-}

app/src/main/java/org/thoughtcrime/securesms/util/StickyHeaderDecoration.java

@@ -131,7 +131,7 @@ public class StickyHeaderDecoration extends RecyclerView.ItemDecoration {
                            int layoutPos)
   {
     int headerHeight = getHeaderHeightForLayout(header);
-    int top = getChildY(parent, child) - headerHeight;
+    int top = (int)child.getY() - headerHeight;
     if (sticky && layoutPos == 0) {
       final int count = parent.getChildCount();
       final long currentId = adapter.getHeaderId(adapterPos);
@@ -142,7 +142,7 @@ public class StickyHeaderDecoration extends RecyclerView.ItemDecoration {
           long nextId = adapter.getHeaderId(adapterPosHere);
           if (nextId != currentId) {
             final View next = parent.getChildAt(translatedChildPosition(parent, i));
-            final int offset = getChildY(parent, next) - (headerHeight + getHeader(parent, adapter, adapterPosHere).itemView.getHeight());
+            final int offset = (int)next.getY() - (headerHeight + getHeader(parent, adapter, adapterPosHere).itemView.getHeight());
             if (offset < 0) {
               return offset;
             } else {
@@ -162,16 +162,6 @@ public class StickyHeaderDecoration extends RecyclerView.ItemDecoration {
     return isReverseLayout(parent) ? parent.getChildCount() - 1 - position : position;
   }
 
-  private int getChildY(RecyclerView parent, View child) {
-    if (VERSION.SDK_INT < 11) {
-      Rect rect = new Rect();
-      parent.getChildVisibleRect(child, rect, null);
-      return rect.top;
-    } else {
-      return (int)ViewCompat.getY(child);
-    }
-  }
-
   protected int getHeaderHeightForLayout(View header) {
     return renderInline ? 0 : header.getHeight();
   }

app/src/main/java/org/thoughtcrime/securesms/video/EncryptedMediaDataSource.java

@@ -1,22 +1,20 @@
 package org.thoughtcrime.securesms.video;
 
 
-import android.annotation.TargetApi;
 import android.media.MediaDataSource;
-import android.os.Build;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
+import org.session.libsession.utilities.Util;
 import org.thoughtcrime.securesms.crypto.AttachmentSecret;
 import org.thoughtcrime.securesms.crypto.ClassicDecryptingPartInputStream;
 import org.thoughtcrime.securesms.crypto.ModernDecryptingPartInputStream;
-import org.session.libsession.utilities.Util;
 
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 
-@TargetApi(Build.VERSION_CODES.M)
 public class EncryptedMediaDataSource extends MediaDataSource {
 
   private final AttachmentSecret attachmentSecret;

app/src/main/java/org/thoughtcrime/securesms/webrtc/audio/AudioManagerCompat.java

@@ -8,10 +8,8 @@ import android.media.AudioDeviceInfo;
 import android.media.AudioFocusRequest;
 import android.media.AudioManager;
 import android.media.SoundPool;
-import android.os.Build;
 
 import androidx.annotation.NonNull;
-import androidx.annotation.RequiresApi;
 
 import org.session.libsession.utilities.ServiceUtil;
 import org.session.libsignal.utilities.Log;
@@ -116,14 +114,9 @@ public abstract class AudioManagerCompat {
     abstract public void abandonCallAudioFocus();
 
     public static AudioManagerCompat create(@NonNull Context context) {
-        if (Build.VERSION.SDK_INT >= 26) {
         return new Api26AudioManagerCompat(context);
-        } else {
-            return new Api21AudioManagerCompat(context);
-        }
     }
 
-    @RequiresApi(26)
     private static class Api26AudioManagerCompat extends AudioManagerCompat {
 
         private static AudioAttributes AUDIO_ATTRIBUTES = new AudioAttributes.Builder()
@@ -180,44 +173,4 @@ public abstract class AudioManagerCompat {
             audioFocusRequest = null;
         }
     }
-
-    @RequiresApi(21)
-    private static class Api21AudioManagerCompat extends AudioManagerCompat {
-
-        private static AudioAttributes AUDIO_ATTRIBUTES = new AudioAttributes.Builder()
-                .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
-                .setUsage(AudioAttributes.USAGE_VOICE_COMMUNICATION)
-                .setLegacyStreamType(AudioManager.STREAM_VOICE_CALL)
-                .build();
-
-        private Api21AudioManagerCompat(@NonNull Context context) {
-            super(context);
-        }
-
-        @Override
-        public SoundPool createSoundPool() {
-            return new SoundPool.Builder()
-                    .setAudioAttributes(AUDIO_ATTRIBUTES)
-                    .setMaxStreams(1)
-                    .build();
-        }
-
-        @Override
-        public void requestCallAudioFocus() {
-            int result = audioManager.requestAudioFocus(onAudioFocusChangeListener, AudioManager.STREAM_VOICE_CALL, AUDIOFOCUS_GAIN);
-
-            if (result != AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
-                Log.w(TAG, "Audio focus not granted. Result code: " + result);
-            }
-        }
-
-        @Override
-        public void abandonCallAudioFocus() {
-            int result = audioManager.abandonAudioFocus(onAudioFocusChangeListener);
-
-            if (result != AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
-                Log.w(TAG, "Audio focus abandon failed. Result code: " + result);
-            }
-        }
-    }
 }

build.gradle

@@ -69,7 +69,7 @@ allprojects {
     }
 
     project.ext {
-        androidMinimumSdkVersion = 23
+        androidMinimumSdkVersion = 26
         androidTargetSdkVersion  = 34
         androidCompileSdkVersion = 34
     }

libsession/src/main/java/org/session/libsession/snode/SnodeAPI.kt

@@ -73,8 +73,8 @@ object SnodeAPI {
     private const val maxRetryCount = 6
     private const val minimumSnodePoolCount = 12
     private const val minimumSwarmSnodeCount = 3
-    // Use port 4433 if the API level can handle the network security configuration and enforce pinned certificates
+    // Use port 4433 to enforce pinned certificates
-    private val seedNodePort = if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) 443 else 4443
+    private val seedNodePort = 4443
 
     private const val useTestnet = false
 

libsession/src/main/java/org/session/libsession/utilities/DecodedAudio.kt

@@ -5,17 +5,12 @@ import android.media.MediaCodec
 import android.media.MediaDataSource
 import android.media.MediaExtractor
 import android.media.MediaFormat
-import android.os.Build
-
-import androidx.annotation.RequiresApi
-
 import java.io.FileDescriptor
 import java.io.IOException
 import java.io.InputStream
 import java.nio.ByteBuffer
 import java.nio.ByteOrder
 import java.nio.ShortBuffer
-import kotlin.jvm.Throws
 import kotlin.math.ceil
 import kotlin.math.roundToInt
 import kotlin.math.sqrt
@@ -44,7 +39,6 @@ class DecodedAudio {
         }
 
         @JvmStatic
-        @RequiresApi(api = Build.VERSION_CODES.M)
         @Throws(IOException::class)
         fun create(dataSource: MediaDataSource): DecodedAudio {
             val mediaExtractor = MediaExtractor().apply { setDataSource(dataSource) }
@@ -69,15 +63,7 @@ class DecodedAudio {
 
     val samples: ShortBuffer
         get() {
-            return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N &&
+            return decodedSamples.asReadOnlyBuffer()
-                    Build.VERSION.SDK_INT <= Build.VERSION_CODES.N_MR1
-            ) {
-                // Hack for Nougat where asReadOnlyBuffer fails to respect byte ordering.
-                // See https://code.google.com/p/android/issues/detail?id=223824
-                decodedSamples
-            } else {
-                decodedSamples.asReadOnlyBuffer()
-            }
         }
 
     /**
@@ -128,7 +114,6 @@ class DecodedAudio {
         codec.start()
 
         // Check if the track is in PCM 16 bit encoding.
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
         try {
             val pcmEncoding = codec.outputFormat.getInteger(MediaFormat.KEY_PCM_ENCODING)
             if (pcmEncoding != AudioFormat.ENCODING_PCM_16BIT) {
@@ -137,7 +122,6 @@ class DecodedAudio {
         } catch (e: NullPointerException) {
             // If KEY_PCM_ENCODING is not specified, means it's ENCODING_PCM_16BIT.
         }
-        }
 
         var decodedSamplesSize: Int = 0  // size of the output buffer containing decoded samples.
         var decodedSamples: ByteArray? = null

libsession/src/main/java/org/session/libsession/utilities/ServiceUtil.java

@@ -6,13 +6,8 @@ import android.app.NotificationManager;
 import android.content.Context;
 import android.media.AudioManager;
 import android.net.ConnectivityManager;
-import android.os.Build;
 import android.os.PowerManager;
 import android.os.Vibrator;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.annotation.RequiresApi;
-import android.telephony.SubscriptionManager;
 import android.telephony.TelephonyManager;
 import android.view.WindowManager;
 import android.view.inputmethod.InputMethodManager;
@@ -54,8 +49,4 @@ public class ServiceUtil {
     return  (Vibrator)context.getSystemService(Context.VIBRATOR_SERVICE);
   }
 
-  @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP_MR1)
-  public static @Nullable SubscriptionManager getSubscriptionManager(@NonNull Context context) {
-    return (SubscriptionManager) context.getSystemService(Context.TELEPHONY_SUBSCRIPTION_SERVICE);
-  }
 }

libsession/src/main/java/org/session/libsession/utilities/ViewUtil.java

@@ -19,21 +19,16 @@ package org.session.libsession.utilities;
 import android.app.Activity;
 import android.content.Context;
 import android.graphics.drawable.Drawable;
-import android.os.Build.VERSION;
-import android.os.Build.VERSION_CODES;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.view.ViewStub;
 import android.view.animation.AlphaAnimation;
 import android.view.animation.Animation;
-import android.widget.LinearLayout.LayoutParams;
 
 import androidx.annotation.IdRes;
 import androidx.annotation.LayoutRes;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.core.view.ViewCompat;
 import androidx.interpolator.view.animation.FastOutSlowInInterpolator;
 
 import org.session.libsignal.utilities.ListenableFuture;
@@ -42,58 +37,7 @@ import org.session.libsignal.utilities.SettableFuture;
 public class ViewUtil {
   @SuppressWarnings("deprecation")
   public static void setBackground(final @NonNull View v, final @Nullable Drawable drawable) {
-    if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN) {
     v.setBackground(drawable);
-    } else {
-      v.setBackgroundDrawable(drawable);
-    }
-  }
-
-  public static void setY(final @NonNull View v, final int y) {
-    if (VERSION.SDK_INT >= 11) {
-      ViewCompat.setY(v, y);
-    } else {
-      ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams)v.getLayoutParams();
-      params.topMargin = y;
-      v.setLayoutParams(params);
-    }
-  }
-
-  public static float getY(final @NonNull View v) {
-    if (VERSION.SDK_INT >= 11) {
-      return ViewCompat.getY(v);
-    } else {
-      return ((ViewGroup.MarginLayoutParams)v.getLayoutParams()).topMargin;
-    }
-  }
-
-  public static void setX(final @NonNull View v, final int x) {
-    if (VERSION.SDK_INT >= 11) {
-      ViewCompat.setX(v, x);
-    } else {
-      ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams)v.getLayoutParams();
-      params.leftMargin = x;
-      v.setLayoutParams(params);
-    }
-  }
-
-  public static float getX(final @NonNull View v) {
-    if (VERSION.SDK_INT >= 11) {
-      return ViewCompat.getX(v);
-    } else {
-      return ((LayoutParams)v.getLayoutParams()).leftMargin;
-    }
-  }
-
-  public static void swapChildInPlace(ViewGroup parent, View toRemove, View toAdd, int defaultIndex) {
-    int childIndex = parent.indexOfChild(toRemove);
-    if (childIndex > -1) parent.removeView(toRemove);
-    parent.addView(toAdd, childIndex > -1 ? childIndex : defaultIndex);
-  }
-
-  @SuppressWarnings("unchecked")
-  public static <T extends View> T inflateStub(@NonNull View parent, @IdRes int stubId) {
-    return (T)((ViewStub)parent.findViewById(stubId)).inflate();
   }
 
   @SuppressWarnings("unchecked")
@@ -106,10 +50,6 @@ public class ViewUtil {
     return (T) parent.findViewById(resId);
   }
 
-  public static <T extends View> Stub<T> findStubById(@NonNull Activity parent, @IdRes int resId) {
-    return new Stub<T>((ViewStub)parent.findViewById(resId));
-  }
-
   private static Animation getAlphaAnimation(float from, float to, int duration) {
     final Animation anim = new AlphaAnimation(from, to);
     anim.setInterpolator(new FastOutSlowInInterpolator());
@@ -177,58 +117,4 @@ public class ViewUtil {
     return (int)((dp * context.getResources().getDisplayMetrics().density) + 0.5);
   }
 
-  public static void updateLayoutParams(@NonNull View view, int width, int height) {
-    view.getLayoutParams().width  = width;
-    view.getLayoutParams().height = height;
-    view.requestLayout();
-  }
-
-  public static int getLeftMargin(@NonNull View view) {
-    if (ViewCompat.getLayoutDirection(view) == ViewCompat.LAYOUT_DIRECTION_LTR) {
-      return ((ViewGroup.MarginLayoutParams) view.getLayoutParams()).leftMargin;
-    }
-    return ((ViewGroup.MarginLayoutParams) view.getLayoutParams()).rightMargin;
-  }
-
-  public static int getRightMargin(@NonNull View view) {
-    if (ViewCompat.getLayoutDirection(view) == ViewCompat.LAYOUT_DIRECTION_LTR) {
-      return ((ViewGroup.MarginLayoutParams) view.getLayoutParams()).rightMargin;
-    }
-    return ((ViewGroup.MarginLayoutParams) view.getLayoutParams()).leftMargin;
-  }
-
-  public static void setLeftMargin(@NonNull View view, int margin) {
-    if (ViewCompat.getLayoutDirection(view) == ViewCompat.LAYOUT_DIRECTION_LTR) {
-      ((ViewGroup.MarginLayoutParams) view.getLayoutParams()).leftMargin = margin;
-    } else {
-      ((ViewGroup.MarginLayoutParams) view.getLayoutParams()).rightMargin = margin;
-    }
-    view.forceLayout();
-    view.requestLayout();
-  }
-
-  public static void setTopMargin(@NonNull View view, int margin) {
-    ((ViewGroup.MarginLayoutParams) view.getLayoutParams()).topMargin = margin;
-    view.requestLayout();
-  }
-
-  public static void setPaddingTop(@NonNull View view, int padding) {
-    view.setPadding(view.getPaddingLeft(), padding, view.getPaddingRight(), view.getPaddingBottom());
-  }
-
-  public static void setPaddingBottom(@NonNull View view, int padding) {
-    view.setPadding(view.getPaddingLeft(), view.getPaddingTop(), view.getPaddingRight(), padding);
-  }
-
-  public static boolean isPointInsideView(@NonNull View view, float x, float y) {
-    int[] location = new int[2];
-
-    view.getLocationOnScreen(location);
-
-    int viewX = location[0];
-    int viewY = location[1];
-
-    return x > viewX && x < viewX + view.getWidth() &&
-           y > viewY && y < viewY + view.getHeight();
-  }
 }

libsession/src/main/java/org/session/libsession/utilities/recipients/Recipient.java

@@ -718,7 +718,7 @@ public class Recipient implements RecipientModifiedListener {
   }
 
   public synchronized @Nullable String getNotificationChannel() {
-    return !(Build.VERSION.SDK_INT >= 26) ? null : notificationChannel;
+    return notificationChannel;
   }
 
   public void setNotificationChannel(@Nullable String value) {