add imageview into simpleexoplayerview to display subtitles that are image based

library/src/main/java/com/google/android/exoplayer2/text/ImageCue.java

+package com.google.android.exoplayer2.text;
+
+import android.graphics.Bitmap;
+
+public class ImageCue extends Cue {
+
+    public ImageCue() { super(""); }
+
+    public Bitmap getBitmap() { return null; }
+    public int getX() { return 0; }
+    public int getY() { return 0; }
+    public int getWidth() { return 0; }
+    public int getHeight() { return 0; }
+    public boolean isForcedSubtitle() { return false; }
+}

library/src/main/java/com/google/android/exoplayer2/ui/SimpleExoPlayerView.java

@@ -40,6 +40,7 @@ import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.metadata.id3.ApicFrame;
 import com.google.android.exoplayer2.source.TrackGroupArray;
 import com.google.android.exoplayer2.text.Cue;
+import com.google.android.exoplayer2.text.ImageCue;
 import com.google.android.exoplayer2.text.TextRenderer;
 import com.google.android.exoplayer2.trackselection.TrackSelection;
 import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
@@ -171,6 +172,7 @@ public final class SimpleExoPlayerView extends FrameLayout {
   private final View surfaceView;
   private final ImageView artworkView;
   private final SubtitleView subtitleView;
+  private final ImageView subtitleImageView;
   private final PlaybackControlView controller;
   private final ComponentListener componentListener;
   private final FrameLayout overlayFrameLayout;
@@ -178,6 +180,7 @@ public final class SimpleExoPlayerView extends FrameLayout {
   private SimpleExoPlayer player;
   private boolean useController;
   private boolean useArtwork;
+  private boolean subtitlesEnabled = false;
   private int controllerShowTimeoutMs;
 
   public SimpleExoPlayerView(Context context) {
@@ -253,6 +256,8 @@ public final class SimpleExoPlayerView extends FrameLayout {
       subtitleView.setUserDefaultTextSize();
     }
 
+    subtitleImageView = (ImageView) findViewById(R.id.exo_subtitles_image);
+
     // Playback control view.
     View controllerPlaceholder = findViewById(R.id.exo_controller_placeholder);
     if (controllerPlaceholder != null) {
@@ -523,14 +528,26 @@ public final class SimpleExoPlayerView extends FrameLayout {
       return;
     }
     TrackSelectionArray selections = player.getCurrentTrackSelections();
+    boolean quickExit = false;
     for (int i = 0; i < selections.length; i++) {
-      if (player.getRendererType(i) == C.TRACK_TYPE_VIDEO && selections.get(i) != null) {
+      switch(player.getRendererType(i)) {
+        case C.TRACK_TYPE_VIDEO:
+          if (selections.get(i) != null) {
             // Video enabled so artwork must be hidden. If the shutter is closed, it will be opened in
             // onRenderedFirstFrame().
+
             hideArtwork();
-        return;
+            quickExit = true;
           }
+          break;
+        case C.TRACK_TYPE_TEXT:
+          if (selections.get(i) != null)
+            subtitlesEnabled = true;
+          break;
       }
+    }
+    if (quickExit)
+      return;
     // Video disabled so the shutter must be closed.
     if (shutterView != null) {
       shutterView.setVisibility(VISIBLE);
@@ -597,20 +614,85 @@ public final class SimpleExoPlayerView extends FrameLayout {
   private final class ComponentListener implements SimpleExoPlayer.VideoListener,
       TextRenderer.Output, ExoPlayer.EventListener {
 
+
+    private int sourceWidth = 0;
+    private int sourceHeight = 0;
+
     // TextRenderer.Output implementation
 
     @Override
     public void onCues(List<Cue> cues) {
-      if (subtitleView != null) {
+
+      boolean skipNormalCues = false;
+      if (subtitleImageView != null) {
+
+        final ImageCue cue = (cues != null && !cues.isEmpty() && cues.get(0) instanceof ImageCue) ? (ImageCue) cues.get(0) : null;
+        skipNormalCues = (cue != null);
+        if (cue == null || (!subtitlesEnabled && !cue.isForcedSubtitle())) {
+          subtitleImageView.setImageBitmap(null);
+          subtitleImageView.setVisibility(View.INVISIBLE);
+        }
+        else {
+          handleImageCue(cue);
+        }
+      }
+      if (!skipNormalCues && subtitleView != null) {
         subtitleView.onCues(cues);
       }
     }
 
+    private void handleImageCue(ImageCue cue) {
+      Bitmap bitmap = cue.getBitmap();
+      if (bitmap != null && surfaceView != null) {
+        int surfaceAnchorX = (int) surfaceView.getX();
+        int surfaceAnchorY = (int) surfaceView.getY();
+        int surfaceWidth = surfaceView.getWidth();
+        int surfaceHeight = surfaceView.getHeight();
+        int subAnchorX = cue.getX();
+        int subAnchorY = cue.getY();
+        int subScaleWidth = cue.getWidth();
+        int subScaleHeight = cue.getHeight();
+
+        // they should change together as we keep the aspect ratio
+        if ((surfaceHeight != sourceHeight || surfaceWidth != sourceWidth)
+         && sourceHeight > 0 && sourceWidth > 0) {
+          double scale;
+          if (surfaceWidth != sourceWidth)
+            scale = (double) surfaceWidth / (double) sourceWidth;
+          else
+            scale = (double) surfaceHeight / (double) sourceHeight;
+          subScaleHeight = (int) (scale * subScaleHeight);
+          subScaleWidth = (int) (scale * subScaleWidth);
+        }
+        if (surfaceAnchorX != 0)
+          subAnchorX += surfaceAnchorX;
+        if (subAnchorY != 0)
+          subAnchorY += surfaceAnchorY;
+
+        ViewGroup.LayoutParams params = subtitleImageView.getLayoutParams();
+        params.width = subScaleWidth;
+        params.height = subScaleHeight;
+        subtitleImageView.setX(subAnchorX);
+        subtitleImageView.setY(subAnchorY);
+        subtitleImageView.setLayoutParams(params);
+        subtitleImageView.setImageBitmap(bitmap);
+        subtitleImageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
+        subtitleImageView.setVisibility(View.VISIBLE);
+      }
+      else {
+        subtitleImageView.setImageBitmap(null);
+        subtitleImageView.setVisibility(View.INVISIBLE);
+      }
+    }
+
     // SimpleExoPlayer.VideoListener implementation
 
     @Override
     public void onVideoSizeChanged(int width, int height, int unappliedRotationDegrees,
         float pixelWidthHeightRatio) {
+
+      sourceWidth = width;
+      sourceHeight = height;
       if (contentFrame != null) {
         float aspectRatio = height == 0 ? 1 : (width * pixelWidthHeightRatio) / height;
         contentFrame.setAspectRatio(aspectRatio);

library/src/main/res/layout/exo_simple_player_view.xml

@@ -36,6 +36,12 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>
 
+    <ImageView
+        android:id="@+id/exo_subtitles_image"
+        android:visibility="invisible"
+        android:layout_height="0dp"
+        android:layout_width="0dp" />
+
   </com.google.android.exoplayer2.ui.AspectRatioFrameLayout>
 
   <View android:id="@id/exo_controller_placeholder"