Show long-press-magnify in sticker preview screen.

res/layout/sticker_preview_list_item.xml

@@ -4,4 +4,5 @@
     android:id="@+id/sticker_install_item_image"
     android:layout_width="match_parent"
     android:layout_height="@dimen/sticker_preview_sticker_size"
+    android:layout_marginTop="6dp"
     android:scaleType="centerInside"/>

res/layout/sticker_preview_popup.xml

@@ -1,14 +1,35 @@
 <?xml version="1.0" encoding="utf-8"?>
 <FrameLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:background="?sticker_popup_background">
 
-    <ImageView
-        android:id="@+id/sticker_popup_image"
-        android:layout_width="200dp"
-        android:layout_height="200dp"
-        android:layout_gravity="center"/>
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:orientation="vertical"
+        android:gravity="center">
+
+        <org.thoughtcrime.securesms.components.emoji.EmojiTextView
+            android:id="@+id/sticker_popup_emoji"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:padding="8dp"
+            android:gravity="center"
+            android:maxLines="1"
+            android:textSize="22sp"
+            tools:text=":)"/>
+
+        <ImageView
+            android:id="@+id/sticker_popup_image"
+            android:layout_width="200dp"
+            android:layout_height="200dp"
+            android:layout_gravity="center"
+            tools:src="@drawable/ic_contact_picture"/>
+
+    </LinearLayout>
 
 </FrameLayout>

src/org/thoughtcrime/securesms/stickers/StickerKeyboardPageAdapter.java

@@ -45,8 +45,7 @@ final class StickerKeyboardPageAdapter extends RecyclerView.Adapter<StickerKeybo
   }
 
   @Override
-  public @NonNull
-  StickerKeyboardPageViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
+  public @NonNull StickerKeyboardPageViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
     return new StickerKeyboardPageViewHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.sticker_keyboard_page_list_item, viewGroup, false));
   }
 

src/org/thoughtcrime/securesms/stickers/StickerKeyboardPageFragment.java

@@ -1,7 +1,6 @@
 package org.thoughtcrime.securesms.stickers;
 
 import androidx.lifecycle.ViewModelProviders;
-import android.content.Context;
 import android.content.res.Configuration;
 import android.graphics.Point;
 import android.os.Bundle;
@@ -11,9 +10,7 @@ import androidx.annotation.Px;
 import androidx.fragment.app.Fragment;
 import androidx.recyclerview.widget.GridLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
-import android.view.Gravity;
 import android.view.LayoutInflater;
-import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 
@@ -21,15 +18,18 @@ import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.database.DatabaseFactory;
 import org.thoughtcrime.securesms.database.model.StickerRecord;
 import org.thoughtcrime.securesms.logging.Log;
+import org.thoughtcrime.securesms.mms.DecryptableStreamUriLoader;
 import org.thoughtcrime.securesms.mms.GlideApp;
 import org.thoughtcrime.securesms.mms.GlideRequests;
 import org.thoughtcrime.securesms.stickers.StickerKeyboardPageAdapter.StickerKeyboardPageViewHolder;
-import org.thoughtcrime.securesms.util.ViewUtil;
+import org.whispersystems.libsignal.util.Pair;
 
 /**
  * An individual page of stickers in the {@link StickerKeyboardProvider}.
  */
-public final class StickerKeyboardPageFragment extends Fragment implements StickerKeyboardPageAdapter.EventListener {
+public final class StickerKeyboardPageFragment extends Fragment implements StickerKeyboardPageAdapter.EventListener,
+                                                                           StickerRolloverTouchListener.RolloverStickerRetriever
+{
 
   private static final String TAG = Log.tag(StickerKeyboardPageFragment.class);
 
@@ -43,7 +43,7 @@ public final class StickerKeyboardPageFragment extends Fragment implements Stick
 
   private StickerKeyboardPageViewModel viewModel;
   private EventListener                eventListener;
-  private ListTouchListener            listTouchListener;
+  private StickerRolloverTouchListener listTouchListener;
 
   private String                       packId;
 
@@ -70,7 +70,7 @@ public final class StickerKeyboardPageFragment extends Fragment implements Stick
     this.list              = view.findViewById(R.id.sticker_keyboard_list);
     this.adapter           = new StickerKeyboardPageAdapter(glideRequests, this);
     this.layoutManager     = new GridLayoutManager(requireContext(), 2);
-    this.listTouchListener = new ListTouchListener(requireContext(), glideRequests);
+    this.listTouchListener = new StickerRolloverTouchListener(requireContext(), glideRequests, eventListener, this);
     this.packId            = getArguments().getString(KEY_PACK_ID);
 
     list.setLayoutManager(layoutManager);
@@ -101,6 +101,18 @@ public final class StickerKeyboardPageFragment extends Fragment implements Stick
     }
   }
 
+  @Override
+  public @Nullable Pair<Object, String> getStickerDataFromView(@NonNull View view) {
+    if (list != null) {
+      StickerKeyboardPageViewHolder holder = (StickerKeyboardPageViewHolder) list.getChildViewHolder(view);
+      if (holder != null && holder.getCurrentSticker() != null) {
+        return new Pair<>(new DecryptableStreamUriLoader.DecryptableUri(holder.getCurrentSticker().getUri()),
+                          holder.getCurrentSticker().getEmoji());
+      }
+    }
+    return null;
+  }
+
   public void setEventListener(@NonNull EventListener eventListener) {
     this.eventListener = eventListener;
   }
@@ -146,69 +158,7 @@ public final class StickerKeyboardPageFragment extends Fragment implements Stick
     return (int) ((screenWidth - ((columnCount + 1) * multiplier)) / columnCount);
   }
 
-  private final class ListTouchListener implements RecyclerView.OnItemTouchListener {
-
-    private final StickerPreviewPopup popup;
-
-    private boolean hoverMode;
-
-    ListTouchListener(@NonNull Context context, @NonNull GlideRequests glideRequests) {
-      this.popup = new StickerPreviewPopup(context, glideRequests);
-      popup.setAnimationStyle(R.style.StickerPopupAnimation);
-    }
-
-    @Override
-    public boolean onInterceptTouchEvent(@NonNull RecyclerView recyclerView, @NonNull MotionEvent motionEvent) {
-      return hoverMode;
-    }
-
-    @Override
-    public void onTouchEvent(@NonNull RecyclerView recyclerView, @NonNull MotionEvent motionEvent) {
-      switch (motionEvent.getAction()) {
-        case MotionEvent.ACTION_UP:
-        case MotionEvent.ACTION_CANCEL:
-          hoverMode = false;
-          popup.dismiss();
-          eventListener.onStickerPopupEnded();
-          break;
-        default:
-          for (int i = 0, len = recyclerView.getChildCount(); i < len; i++) {
-            View child = recyclerView.getChildAt(i);
-
-            if (ViewUtil.isPointInsideView(recyclerView, motionEvent.getRawX(), motionEvent.getRawY()) &&
-                ViewUtil.isPointInsideView(child, motionEvent.getRawX(), motionEvent.getRawY()))
-            {
-              showStickerForView(recyclerView, child);
-            }
-          }
-      }
-    }
-
-    @Override
-    public void onRequestDisallowInterceptTouchEvent(boolean b) {
-    }
-
-    void enterHoverMode(@NonNull RecyclerView recyclerView, View targetView) {
-      this.hoverMode = true;
-      showStickerForView(recyclerView, targetView);
-    }
-
-    private void showStickerForView(@NonNull RecyclerView recyclerView, @NonNull View view) {
-      StickerKeyboardPageViewHolder holder = (StickerKeyboardPageViewHolder) recyclerView.getChildViewHolder(view);
-
-      if (holder != null && holder.getCurrentSticker() != null) {
-        if (!popup.isShowing()) {
-          popup.showAtLocation(recyclerView, Gravity.NO_GRAVITY, 0, 0);
-          eventListener.onStickerPopupStarted();
-        }
-        popup.presentSticker(holder.getCurrentSticker());
-      }
-    }
-  }
-
-  interface EventListener {
+  interface EventListener extends StickerRolloverTouchListener.RolloverEventListener {
     void onStickerSelected(@NonNull StickerRecord sticker);
-    void onStickerPopupStarted();
-    void onStickerPopupEnded();
   }
 }

src/org/thoughtcrime/securesms/stickers/StickerPackPreviewActivity.java

@@ -1,5 +1,6 @@
 package org.thoughtcrime.securesms.stickers;
 
+import androidx.annotation.Nullable;
 import androidx.lifecycle.ViewModelProviders;
 import android.content.Intent;
 import android.content.res.Configuration;
@@ -22,11 +23,13 @@ import org.thoughtcrime.securesms.ApplicationContext;
 import org.thoughtcrime.securesms.PassphraseRequiredActionBarActivity;
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.ShareActivity;
+import org.thoughtcrime.securesms.database.model.StickerRecord;
 import org.thoughtcrime.securesms.dependencies.ApplicationDependencies;
 import org.thoughtcrime.securesms.jobs.StickerPackDownloadJob;
 import org.thoughtcrime.securesms.logging.Log;
 import org.thoughtcrime.securesms.mms.DecryptableStreamUriLoader;
 import org.thoughtcrime.securesms.mms.GlideApp;
+import org.thoughtcrime.securesms.mms.GlideRequests;
 import org.thoughtcrime.securesms.stickers.StickerManifest.Sticker;
 import org.thoughtcrime.securesms.util.DynamicNoActionBarTheme;
 import org.thoughtcrime.securesms.util.DynamicTheme;
@@ -40,7 +43,11 @@ import org.whispersystems.libsignal.util.guava.Optional;
  * Shows the contents of a pack and allows the user to install it (if not installed) or remove it
  * (if installed). This is also the handler for sticker pack deep links.
  */
-public final class StickerPackPreviewActivity extends PassphraseRequiredActionBarActivity {
+public final class StickerPackPreviewActivity extends    PassphraseRequiredActionBarActivity
+                                              implements StickerRolloverTouchListener.RolloverEventListener,
+                                                         StickerRolloverTouchListener.RolloverStickerRetriever,
+                                                         StickerPackPreviewAdapter.EventListener
+{
 
   private static final String TAG = Log.tag(StickerPackPreviewActivity.class);
 
@@ -57,8 +64,9 @@ public final class StickerPackPreviewActivity extends PassphraseRequiredActionBa
   private View         shareButton;
   private View         shareButtonImage;
 
-  private StickerPackPreviewAdapter adapter;
-  private GridLayoutManager         layoutManager;
+  private StickerPackPreviewAdapter    adapter;
+  private GridLayoutManager            layoutManager;
+  private StickerRolloverTouchListener touchListener;
 
   public static Intent getIntent(@NonNull String packId, @NonNull String packKey) {
     Intent intent = new Intent(Intent.ACTION_VIEW, StickerUrl.createActionUri(packId, packKey));
@@ -105,6 +113,32 @@ public final class StickerPackPreviewActivity extends PassphraseRequiredActionBa
     onScreenWidthChanged(getScreenWidth());
   }
 
+  @Override
+  public void onStickerLongPress(@NonNull View view) {
+    if (touchListener != null) {
+      touchListener.enterHoverMode(stickerList, view);
+    }
+  }
+
+  @Override
+  public void onStickerPopupStarted() {
+  }
+
+  @Override
+  public void onStickerPopupEnded() {
+  }
+
+  @Override
+  public @Nullable Pair<Object, String> getStickerDataFromView(@NonNull View view) {
+    if (stickerList != null) {
+      StickerPackPreviewAdapter.StickerViewHolder holder = (StickerPackPreviewAdapter.StickerViewHolder) stickerList.getChildViewHolder(view);
+      if (holder != null) {
+        return new Pair<>(holder.getCurrentGlideModel(), holder.getCurrentEmoji());
+      }
+    }
+    return null;
+  }
+
   private void initView() {
     this.coverImage       = findViewById(R.id.sticker_install_cover);
     this.stickerTitle     = findViewById(R.id.sticker_install_title);
@@ -115,11 +149,13 @@ public final class StickerPackPreviewActivity extends PassphraseRequiredActionBa
     this.shareButton      = findViewById(R.id.sticker_install_share_button);
     this.shareButtonImage = findViewById(R.id.sticker_install_share_button_image);
 
-    this.adapter       = new StickerPackPreviewAdapter(GlideApp.with(this));
+    this.adapter       = new StickerPackPreviewAdapter(GlideApp.with(this), this);
     this.layoutManager = new GridLayoutManager(this, 2);
+    this.touchListener = new StickerRolloverTouchListener(this, GlideApp.with(this), this, this);
     onScreenWidthChanged(getScreenWidth());
 
     stickerList.setLayoutManager(layoutManager);
+    stickerList.addOnItemTouchListener(touchListener);
     stickerList.setAdapter(adapter);
   }
 

src/org/thoughtcrime/securesms/stickers/StickerPackPreviewAdapter.java

@@ -1,6 +1,7 @@
 package org.thoughtcrime.securesms.stickers;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -19,10 +20,12 @@ import java.util.List;
 public final class StickerPackPreviewAdapter extends RecyclerView.Adapter<StickerPackPreviewAdapter.StickerViewHolder>  {
 
   private final GlideRequests                 glideRequests;
+  private final EventListener                 eventListener;
   private final List<StickerManifest.Sticker> list;
 
-  public StickerPackPreviewAdapter(@NonNull GlideRequests glideRequests) {
+  public StickerPackPreviewAdapter(@NonNull GlideRequests glideRequests, @NonNull EventListener eventListener) {
     this.glideRequests = glideRequests;
+    this.eventListener = eventListener;
     this.list          = new ArrayList<>();
   }
 
@@ -33,7 +36,7 @@ public final class StickerPackPreviewAdapter extends RecyclerView.Adapter<Sticke
 
   @Override
   public void onBindViewHolder(@NonNull StickerViewHolder stickerViewHolder, int i) {
-    stickerViewHolder.bind(glideRequests, list.get(i));
+    stickerViewHolder.bind(glideRequests, list.get(i), eventListener);
   }
 
   @Override
@@ -41,6 +44,11 @@ public final class StickerPackPreviewAdapter extends RecyclerView.Adapter<Sticke
     return list.size();
   }
 
+  @Override
+  public void onViewRecycled(@NonNull StickerViewHolder holder) {
+    holder.recycle();
+  }
+
   void setStickers(List<StickerManifest.Sticker> stickers) {
     list.clear();
     list.addAll(stickers);
@@ -51,17 +59,42 @@ public final class StickerPackPreviewAdapter extends RecyclerView.Adapter<Sticke
 
     private final ImageView image;
 
+    private Object currentGlideModel;
+    private String currentEmoji;
+
     private StickerViewHolder(@NonNull View itemView) {
       super(itemView);
       this.image = itemView.findViewById(R.id.sticker_install_item_image);
     }
 
-    void bind(@NonNull GlideRequests glideRequests, @NonNull StickerManifest.Sticker sticker) {
-      Object model = sticker.getUri().isPresent() ? new DecryptableStreamUriLoader.DecryptableUri(sticker.getUri().get())
-                                                  : new StickerRemoteUri(sticker.getPackId(), sticker.getPackKey(), sticker.getId());
-      glideRequests.load(model)
+    void bind(@NonNull GlideRequests glideRequests, @NonNull StickerManifest.Sticker sticker, @NonNull EventListener eventListener) {
+      currentEmoji      = sticker.getEmoji();
+      currentGlideModel = sticker.getUri().isPresent() ? new DecryptableStreamUriLoader.DecryptableUri(sticker.getUri().get())
+                                                       : new StickerRemoteUri(sticker.getPackId(), sticker.getPackKey(), sticker.getId());
+      glideRequests.load(currentGlideModel)
                    .transition(DrawableTransitionOptions.withCrossFade())
                    .into(image);
+
+      image.setOnLongClickListener(v -> {
+        eventListener.onStickerLongPress(v);
+        return true;
+      });
+    }
+
+    void recycle() {
+      image.setOnLongClickListener(null);
+    }
+
+    @Nullable Object getCurrentGlideModel() {
+      return currentGlideModel;
+    }
+
+    @Nullable String getCurrentEmoji() {
+      return currentEmoji;
     }
   }
+
+  interface EventListener {
+    void onStickerLongPress(@NonNull View view);
+  }
 }

src/org/thoughtcrime/securesms/stickers/StickerPreviewPopup.java

@@ -2,14 +2,15 @@ package org.thoughtcrime.securesms.stickers;
 
 import android.content.Context;
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
 import android.view.LayoutInflater;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.PopupWindow;
+import android.widget.TextView;
 
 import org.thoughtcrime.securesms.R;
-import org.thoughtcrime.securesms.database.model.StickerRecord;
-import org.thoughtcrime.securesms.mms.DecryptableStreamUriLoader.DecryptableUri;
 import org.thoughtcrime.securesms.mms.GlideRequests;
 
 
@@ -20,6 +21,7 @@ final class StickerPreviewPopup extends PopupWindow {
 
   private final GlideRequests glideRequests;
   private final ImageView     image;
+  private final TextView      emojiText;
 
   StickerPreviewPopup(@NonNull Context context, @NonNull GlideRequests glideRequests) {
     super(LayoutInflater.from(context).inflate(R.layout.sticker_preview_popup, null),
@@ -27,12 +29,14 @@ final class StickerPreviewPopup extends PopupWindow {
           ViewGroup.LayoutParams.MATCH_PARENT);
     this.glideRequests = glideRequests;
     this.image         = getContentView().findViewById(R.id.sticker_popup_image);
+    this.emojiText     = getContentView().findViewById(R.id.sticker_popup_emoji);
 
     setTouchable(false);
   }
 
-  void presentSticker(@NonNull StickerRecord stickerRecord) {
-    glideRequests.load(new DecryptableUri(stickerRecord.getUri()))
+  void presentSticker(@NonNull Object stickerGlideModel, @Nullable String emoji) {
+    emojiText.setText(emoji);
+    glideRequests.load(stickerGlideModel)
                  .into(image);
   }
 }

src/org/thoughtcrime/securesms/stickers/StickerRolloverTouchListener.java

@@ -0,0 +1,91 @@
+package org.thoughtcrime.securesms.stickers;
+
+import android.content.Context;
+import android.view.Gravity;
+import android.view.MotionEvent;
+import android.view.View;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.recyclerview.widget.RecyclerView;
+
+import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.mms.GlideRequests;
+import org.thoughtcrime.securesms.util.ViewUtil;
+import org.whispersystems.libsignal.util.Pair;
+
+public class StickerRolloverTouchListener implements RecyclerView.OnItemTouchListener {
+  private final StickerPreviewPopup      popup;
+  private final RolloverEventListener    eventListener;
+  private final RolloverStickerRetriever stickerRetriever;
+
+  private boolean hoverMode;
+
+  StickerRolloverTouchListener(@NonNull Context context,
+                               @NonNull GlideRequests glideRequests,
+                               @NonNull RolloverEventListener eventListener,
+                               @NonNull RolloverStickerRetriever stickerRetriever)
+  {
+    this.eventListener    = eventListener;
+    this.stickerRetriever = stickerRetriever;
+    this.popup            = new StickerPreviewPopup(context, glideRequests);
+    popup.setAnimationStyle(R.style.StickerPopupAnimation);
+  }
+
+  @Override
+  public boolean onInterceptTouchEvent(@NonNull RecyclerView recyclerView, @NonNull MotionEvent motionEvent) {
+    return hoverMode;
+  }
+
+  @Override
+  public void onTouchEvent(@NonNull RecyclerView recyclerView, @NonNull MotionEvent motionEvent) {
+    switch (motionEvent.getAction()) {
+      case MotionEvent.ACTION_UP:
+      case MotionEvent.ACTION_CANCEL:
+        hoverMode = false;
+        popup.dismiss();
+        eventListener.onStickerPopupEnded();
+        break;
+      default:
+        for (int i = 0, len = recyclerView.getChildCount(); i < len; i++) {
+          View child = recyclerView.getChildAt(i);
+
+          if (ViewUtil.isPointInsideView(recyclerView, motionEvent.getRawX(), motionEvent.getRawY()) &&
+              ViewUtil.isPointInsideView(child, motionEvent.getRawX(), motionEvent.getRawY()))
+          {
+            showStickerForView(recyclerView, child);
+          }
+        }
+    }
+  }
+
+  @Override
+  public void onRequestDisallowInterceptTouchEvent(boolean b) {
+  }
+
+  void enterHoverMode(@NonNull RecyclerView recyclerView, View targetView) {
+    this.hoverMode = true;
+    showStickerForView(recyclerView, targetView);
+  }
+
+  private void showStickerForView(@NonNull RecyclerView recyclerView, @NonNull View view) {
+    Pair<Object, String> stickerData = stickerRetriever.getStickerDataFromView(view);
+
+    if (stickerData != null) {
+      if (!popup.isShowing()) {
+        popup.showAtLocation(recyclerView, Gravity.NO_GRAVITY, 0, 0);
+        eventListener.onStickerPopupStarted();
+      }
+      popup.presentSticker(stickerData.first(), stickerData.second());
+    }
+  }
+
+  public interface RolloverEventListener {
+    void onStickerPopupStarted();
+    void onStickerPopupEnded();
+  }
+
+  public interface RolloverStickerRetriever {
+    @Nullable Pair<Object, String> getStickerDataFromView(@NonNull View view);
+  }
+}