Fix video playback starting when off screen in media viewer.

app/src/main/java/org/thoughtcrime/securesms/mediapreview/MediaPreviewFragment.java

@@ -29,36 +29,6 @@ public abstract class MediaPreviewFragment extends Fragment {
   private   AttachmentId attachmentId;
   protected Events       events;
 
-  public static MediaPreviewFragment newInstance(@NonNull Attachment attachment, boolean autoPlay) {
-    return newInstance(attachment.getUri(), attachment.getContentType(), attachment.getSize(), autoPlay, attachment.isVideoGif());
-  }
-
-  public static MediaPreviewFragment newInstance(@NonNull Uri dataUri, @NonNull String contentType, long size, boolean autoPlay, boolean isVideoGif) {
-    Bundle args = new Bundle();
-
-    args.putParcelable(MediaPreviewFragment.DATA_URI, dataUri);
-    args.putString(MediaPreviewFragment.DATA_CONTENT_TYPE, contentType);
-    args.putLong(MediaPreviewFragment.DATA_SIZE, size);
-    args.putBoolean(MediaPreviewFragment.AUTO_PLAY, autoPlay);
-    args.putBoolean(MediaPreviewFragment.VIDEO_GIF, isVideoGif);
-
-    MediaPreviewFragment fragment = createCorrectFragmentType(contentType);
-
-    fragment.setArguments(args);
-
-    return fragment;
-  }
-
-  private static MediaPreviewFragment createCorrectFragmentType(@NonNull String contentType) {
-    if (MediaUtil.isVideo(contentType)) {
-      return new VideoMediaPreviewFragment();
-    } else if (MediaUtil.isImageType(contentType)) {
-      return new ImageMediaPreviewFragment();
-    } else {
-      throw new AssertionError("Unexpected media type: " + contentType);
-    }
-  }
-
   @Override
   public void onAttach(@NonNull Context context) {
     super.onAttach(context);
@@ -78,6 +48,7 @@ public abstract class MediaPreviewFragment extends Fragment {
     checkMediaStillAvailable();
   }
 
+  public void autoPlayIfNeeded() {}
   public abstract void cleanUp();
   public abstract void pause();
   public abstract void setBottomButtonControls(MediaPreviewPlayerControlView playerControlView);

app/src/main/java/org/thoughtcrime/securesms/mediapreview/MediaPreviewV2Adapter.kt

@@ -28,7 +28,7 @@ class MediaPreviewV2Adapter(fragment: Fragment) : FragmentStateAdapter(fragment)
       MediaPreviewFragment.DATA_URI to attachment.uri,
       MediaPreviewFragment.DATA_CONTENT_TYPE to contentType,
       MediaPreviewFragment.DATA_SIZE to attachment.size,
-      MediaPreviewFragment.AUTO_PLAY to true,
+      MediaPreviewFragment.AUTO_PLAY to attachment.isVideoGif,
       MediaPreviewFragment.VIDEO_GIF to attachment.isVideoGif,
     )
     val fragment = if (MediaUtil.isVideo(contentType)) {

app/src/main/java/org/thoughtcrime/securesms/mediapreview/MediaPreviewV2Fragment.kt

@@ -297,6 +297,7 @@ class MediaPreviewV2Fragment : LoggingFragment(R.layout.fragment_media_preview_v
       forward(currentItem)
     }
     currentFragment?.setBottomButtonControls(binding.mediaPreviewPlaybackControls)
+    currentFragment?.autoPlayIfNeeded()
   }
 
   private fun bindAlbumRail(albumThumbnailMedia: List<Media>, currentItem: MediaTable.MediaRecord) {

app/src/main/java/org/thoughtcrime/securesms/mediapreview/VideoMediaPreviewFragment.java

@@ -31,14 +31,7 @@ public final class VideoMediaPreviewFragment extends MediaPreviewFragment {
   private boolean     isVideoGif;
 
   @Override
-  public void onCreate(@Nullable Bundle savedInstanceState) {
-    super.onCreate(savedInstanceState);
-  }
-
-  @Override
-  public View onCreateView(LayoutInflater inflater, ViewGroup container,
-                           Bundle savedInstanceState)
-  {
+  public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
     View    itemView    = inflater.inflate(R.layout.media_preview_video_fragment, container, false);
     Bundle  arguments   = requireArguments();
     Uri     uri         = arguments.getParcelable(DATA_URI);
@@ -111,13 +104,6 @@ public final class VideoMediaPreviewFragment extends MediaPreviewFragment {
     cleanUp();
   }
 
-  @Override
-  public void cleanUp() {
-    if (videoView != null) {
-      videoView.cleanup();
-    }
-  }
-
   @Override
   public void onResume() {
     super.onResume();
@@ -131,6 +117,20 @@ public final class VideoMediaPreviewFragment extends MediaPreviewFragment {
     }
   }
 
+  @Override
+  public void autoPlayIfNeeded() {
+    if (videoView != null && videoView.getPlaybackPosition() < videoView.getDuration()) {
+      videoView.play();
+    }
+  }
+
+  @Override
+  public void cleanUp() {
+    if (videoView != null) {
+      videoView.cleanup();
+    }
+  }
+
   @Override
   public void pause() {
     if (videoView != null) {