Add QR group link share.

app/src/main/java/org/thoughtcrime/securesms/components/qr/QrView.java

@@ -0,0 +1,93 @@
+package org.thoughtcrime.securesms.components.qr;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Bitmap;
+import android.graphics.Color;
+import android.util.AttributeSet;
+import android.util.Log;
+
+import androidx.annotation.ColorInt;
+import androidx.annotation.Nullable;
+import androidx.annotation.WorkerThread;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.WriterException;
+import com.google.zxing.common.BitMatrix;
+import com.google.zxing.qrcode.QRCodeWriter;
+
+import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.components.SquareImageView;
+import org.thoughtcrime.securesms.qr.QrCode;
+import org.thoughtcrime.securesms.util.Stopwatch;
+import org.thoughtcrime.securesms.util.concurrent.SerialMonoLifoExecutor;
+import org.thoughtcrime.securesms.util.concurrent.SignalExecutors;
+import org.thoughtcrime.securesms.util.concurrent.SimpleTask;
+
+import java.util.concurrent.Executor;
+
+/**
+ * Generates a bitmap asynchronously for the supplied {@link BitMatrix} data and displays it.
+ */
+public class QrView extends SquareImageView {
+
+  private static final @ColorInt int DEFAULT_FOREGROUND_COLOR = Color.BLACK;
+  private static final @ColorInt int DEFAULT_BACKGROUND_COLOR = Color.TRANSPARENT;
+
+  private @Nullable Bitmap qrBitmap;
+  private @ColorInt int    foregroundColor;
+  private @ColorInt int    backgroundColor;
+
+  public QrView(Context context) {
+    super(context);
+    init(null);
+  }
+
+  public QrView(Context context, AttributeSet attrs) {
+    super(context, attrs);
+    init(attrs);
+  }
+
+  public QrView(Context context, AttributeSet attrs, int defStyleAttr) {
+    super(context, attrs, defStyleAttr);
+    init(attrs);
+  }
+
+  private void init(@Nullable AttributeSet attrs) {
+    if (attrs != null) {
+      TypedArray typedArray = getContext().getTheme().obtainStyledAttributes(attrs, R.styleable.QrView, 0, 0);
+      foregroundColor = typedArray.getColor(R.styleable.QrView_qr_foreground_color, DEFAULT_FOREGROUND_COLOR);
+      backgroundColor = typedArray.getColor(R.styleable.QrView_qr_background_color, DEFAULT_BACKGROUND_COLOR);
+      typedArray.recycle();
+    } else {
+      foregroundColor = DEFAULT_FOREGROUND_COLOR;
+      backgroundColor = DEFAULT_BACKGROUND_COLOR;
+    }
+
+    if (isInEditMode()) {
+      setQrText("https://signal.org");
+    }
+  }
+
+  public void setQrText(@Nullable String text) {
+    setQrBitmap(QrCode.create(text, foregroundColor, backgroundColor));
+  }
+
+  private void setQrBitmap(@Nullable Bitmap qrBitmap) {
+    if (this.qrBitmap == qrBitmap) {
+      return;
+    }
+
+    if (this.qrBitmap != null) {
+      this.qrBitmap.recycle();
+    }
+
+    this.qrBitmap = qrBitmap;
+
+    setImageBitmap(this.qrBitmap);
+  }
+
+  public @Nullable Bitmap getQrBitmap() {
+    return qrBitmap;
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/qr/QrCode.java

@@ -5,33 +5,57 @@ import android.graphics.Color;
 
 import androidx.annotation.ColorInt;
 import androidx.annotation.NonNull;
-import org.thoughtcrime.securesms.logging.Log;
+import androidx.annotation.Nullable;
 
 import com.google.zxing.BarcodeFormat;
 import com.google.zxing.WriterException;
 import com.google.zxing.common.BitMatrix;
 import com.google.zxing.qrcode.QRCodeWriter;
 
-public class QrCode {
+import org.thoughtcrime.securesms.logging.Log;
+import org.thoughtcrime.securesms.util.Stopwatch;
 
-  public static final String TAG = QrCode.class.getSimpleName();
+public final class QrCode {
 
-  public static @NonNull Bitmap create(String data) {
+  private QrCode() {
-    return create(data, Color.BLACK);
   }
 
-  public static @NonNull Bitmap create(String data, @ColorInt int foregroundColor) {
+  public static final String TAG = Log.tag(QrCode.class);
-    try {
-      BitMatrix result = new QRCodeWriter().encode(data, BarcodeFormat.QR_CODE, 512, 512);
-      Bitmap    bitmap = Bitmap.createBitmap(result.getWidth(), result.getHeight(), Bitmap.Config.ARGB_8888);
 
-      for (int y = 0; y < result.getHeight(); y++) {
+  public static @NonNull Bitmap create(@Nullable String data) {
-        for (int x = 0; x < result.getWidth(); x++) {
+    return create(data, Color.BLACK, Color.TRANSPARENT);
-          if (result.get(x, y)) {
+  }
-            bitmap.setPixel(x, y, foregroundColor);
+
-          }
+  public static @NonNull Bitmap create(@Nullable String data,
+                                       @ColorInt int foregroundColor,
+                                       @ColorInt int backgroundColor)
+  {
+    if (data == null || data.length() == 0) {
+      Log.w(TAG, "No data");
+      return Bitmap.createBitmap(512, 512, Bitmap.Config.ARGB_8888);
+    }
+
+    try {
+      Stopwatch    stopwatch    = new Stopwatch("QrGen");
+      QRCodeWriter qrCodeWriter = new QRCodeWriter();
+      BitMatrix    qrData       = qrCodeWriter.encode(data, BarcodeFormat.QR_CODE, 512, 512);
+      int          qrWidth      = qrData.getWidth();
+      int          qrHeight     = qrData.getHeight();
+      int[]        pixels       = new int[qrWidth * qrHeight];
+
+      for (int y = 0; y < qrHeight; y++) {
+        int offset = y * qrWidth;
+
+        for (int x = 0; x < qrWidth; x++) {
+          pixels[offset + x] = qrData.get(x, y) ? foregroundColor : backgroundColor;
         }
       }
+      stopwatch.split("Write pixels");
+
+      Bitmap bitmap = Bitmap.createBitmap(pixels, qrWidth, qrHeight, Bitmap.Config.ARGB_8888);
+
+      stopwatch.split("Create bitmap");
+      stopwatch.stop(TAG);
 
       return bitmap;
     } catch (WriterException e) {

app/src/main/java/org/thoughtcrime/securesms/recipients/ui/sharablegrouplink/GroupLinkBottomSheetDialogFragment.java

@@ -18,6 +18,7 @@ import com.google.android.material.bottomsheet.BottomSheetDialogFragment;
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.groups.GroupId;
 import org.thoughtcrime.securesms.groups.LiveGroup;
+import org.thoughtcrime.securesms.recipients.ui.sharablegrouplink.qr.GroupLinkShareQrDialogFragment;
 import org.thoughtcrime.securesms.util.BottomSheetUtil;
 import org.thoughtcrime.securesms.util.ThemeUtil;
 import org.thoughtcrime.securesms.util.Util;
@@ -77,8 +78,10 @@ public final class GroupLinkBottomSheetDialogFragment extends BottomSheetDialogF
         dismiss();
       });
 
-      viewQrButton.setOnClickListener(v -> dismiss()); // Todo [Alan] GV2 Add share QR within signal
+      viewQrButton.setOnClickListener(v -> {
-      viewQrButton.setVisibility(View.GONE);
+        GroupLinkShareQrDialogFragment.show(requireFragmentManager(), groupId);
+        dismiss();
+      });
 
       shareBySystemButton.setOnClickListener(v -> {
           ShareCompat.IntentBuilder.from(requireActivity())

app/src/main/java/org/thoughtcrime/securesms/recipients/ui/sharablegrouplink/qr/GroupLinkShareQrDialogFragment.java

@@ -0,0 +1,92 @@
+package org.thoughtcrime.securesms.recipients.ui.sharablegrouplink.qr;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.widget.Toolbar;
+import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.lifecycle.ViewModelProviders;
+
+import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.components.qr.QrView;
+import org.thoughtcrime.securesms.groups.GroupId;
+import org.thoughtcrime.securesms.logging.Log;
+import org.thoughtcrime.securesms.util.BottomSheetUtil;
+import org.thoughtcrime.securesms.util.ThemeUtil;
+
+import java.util.Objects;
+
+public class GroupLinkShareQrDialogFragment extends DialogFragment {
+
+  private static final String TAG = Log.tag(GroupLinkShareQrDialogFragment.class);
+
+  private static final String ARG_GROUP_ID = "group_id";
+
+  private GroupLinkShareQrViewModel viewModel;
+  private QrView                    qrImageView;
+  private View                      shareCodeButton;
+
+  public static void show(@NonNull FragmentManager manager, @NonNull GroupId.V2 groupId) {
+    DialogFragment fragment = new GroupLinkShareQrDialogFragment();
+    Bundle         args     = new Bundle();
+
+    args.putString(ARG_GROUP_ID, groupId.toString());
+    fragment.setArguments(args);
+
+    fragment.show(manager, BottomSheetUtil.STANDARD_BOTTOM_SHEET_FRAGMENT_TAG);
+  }
+
+  @Override
+  public void onCreate(@Nullable Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+
+    setStyle(STYLE_NO_FRAME, ThemeUtil.isDarkTheme(requireActivity()) ? R.style.TextSecure_DarkTheme
+                                                                      : R.style.TextSecure_LightTheme);
+  }
+
+  @Override
+  public @Nullable View onCreateView(@NonNull LayoutInflater inflater,
+                                     @Nullable ViewGroup container,
+                                     @Nullable Bundle savedInstanceState)
+  {
+    return inflater.inflate(R.layout.group_link_share_qr_dialog_fragment, container, false);
+  }
+
+  @Override
+  public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+    initializeViewModel();
+    initializeViews(view);
+  }
+
+  private void initializeViewModel() {
+    Bundle                            arguments  = requireArguments();
+    GroupId.V2                        groupId    = GroupId.parseOrThrow(Objects.requireNonNull(arguments.getString(ARG_GROUP_ID))).requireV2();
+    GroupLinkShareQrViewModel.Factory factory    = new GroupLinkShareQrViewModel.Factory(groupId);
+
+    viewModel = ViewModelProviders.of(this, factory).get(GroupLinkShareQrViewModel.class);
+  }
+
+  private void initializeViews(@NonNull View view) {
+    Toolbar toolbar = view.findViewById(R.id.group_link_share_qr_toolbar);
+
+    qrImageView     = view.findViewById(R.id.group_link_share_qr_image);
+    shareCodeButton = view.findViewById(R.id.group_link_share_code_button);
+
+    toolbar.setNavigationOnClickListener(v -> dismissAllowingStateLoss());
+
+    viewModel.getQrUrl().observe(getViewLifecycleOwner(), this::presentUrl);
+  }
+
+  private void presentUrl(@Nullable String url) {
+    qrImageView.setQrText(url);
+
+    shareCodeButton.setOnClickListener(v -> {
+      // TODO [Alan] GV2 Allow qr image share
+    });
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/recipients/ui/sharablegrouplink/qr/GroupLinkShareQrViewModel.java

@@ -0,0 +1,41 @@
+package org.thoughtcrime.securesms.recipients.ui.sharablegrouplink.qr;
+
+import androidx.annotation.NonNull;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.Transformations;
+import androidx.lifecycle.ViewModel;
+import androidx.lifecycle.ViewModelProvider;
+
+import org.thoughtcrime.securesms.groups.GroupId;
+import org.thoughtcrime.securesms.groups.LiveGroup;
+import org.thoughtcrime.securesms.groups.v2.GroupLinkUrlAndStatus;
+
+public final class GroupLinkShareQrViewModel extends ViewModel {
+
+  private final LiveData<String> qrData;
+
+  private GroupLinkShareQrViewModel(@NonNull GroupId.V2 groupId) {
+    LiveGroup liveGroup = new LiveGroup(groupId);
+
+    this.qrData = Transformations.map(liveGroup.getGroupLink(), GroupLinkUrlAndStatus::getUrl);
+  }
+
+  LiveData<String> getQrUrl() {
+    return qrData;
+  }
+
+  public static final class Factory implements ViewModelProvider.Factory {
+
+    private final GroupId.V2 groupId;
+
+    public Factory(@NonNull GroupId.V2 groupId) {
+      this.groupId = groupId;
+    }
+
+    @Override
+    public @NonNull <T extends ViewModel> T create(@NonNull Class<T> modelClass) {
+      //noinspection ConstantConditions
+      return modelClass.cast(new GroupLinkShareQrViewModel(groupId));
+    }
+  }
+}

app/src/main/res/layout/group_link_share_qr_dialog_fragment.xml

@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <androidx.appcompat.widget.Toolbar
+        android:id="@+id/group_link_share_qr_toolbar"
+        android:layout_width="0dp"
+        android:layout_height="?attr/actionBarSize"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:navigationIcon="@drawable/ic_arrow_left_24"
+        app:title="@string/GroupLinkShareQrDialogFragment__qr_code" />
+
+    <org.thoughtcrime.securesms.components.qr.QrView
+        android:id="@+id/group_link_share_qr_image"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:scaleType="fitXY"
+        app:layout_constraintBottom_toTopOf="@+id/group_link_share_code_button"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/group_link_share_qr_toolbar"
+        app:layout_constraintVertical_bias="0.35"
+        app:layout_constraintWidth_percent="0.75"
+        app:qr_background_color="?android:windowBackground"
+        app:qr_foreground_color="?title_text_color_primary" />
+
+    <TextView
+        android:id="@+id/group_link_share_explain"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="24dp"
+        android:labelFor="@id/group_link_share_qr_image"
+        android:paddingStart="32dp"
+        android:paddingEnd="32dp"
+        android:text="@string/GroupLinkShareQrDialogFragment__people_who_scan_this_code_will"
+        android:textAlignment="center"
+        app:layout_constraintBottom_toTopOf="@+id/group_link_share_code_button"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/group_link_share_qr_image"
+        app:layout_constraintVertical_bias="0" />
+
+    <Button
+        android:id="@+id/group_link_share_code_button"
+        style="@style/Button.Primary"
+        android:layout_width="0dp"
+        android:layout_height="64dp"
+        android:layout_marginStart="24dp"
+        android:layout_marginEnd="24dp"
+        android:layout_marginBottom="16dp"
+        android:text="@string/GroupLinkShareQrDialogFragment__share_code"
+        android:visibility="gone"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        tools:visibility="visible" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/attrs.xml

@@ -562,6 +562,11 @@
         <attr name="background_tint" format="color" />
     </declare-styleable>
 
+    <declare-styleable name="QrView">
+        <attr name="qr_foreground_color" format="color" />
+        <attr name="qr_background_color" format="color" />
+    </declare-styleable>
+
     <declare-styleable name="WebRtcAudioOutputToggleButtonState">
         <attr name="state_speaker_on" format="boolean" />
         <attr name="state_speaker_off" format="boolean" />