Fade out video player controls on playback.

2 second delay, cancelable if the video is paused or finished.

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

@@ -98,6 +98,8 @@ public abstract class MediaPreviewFragment extends Fragment {
     boolean singleTapOnMedia();
     void onMediaNotAvailable();
     void onMediaReady();
+    void onPlaying();
+    void onStopped();
     default @Nullable VideoControlsDelegate getVideoControlsDelegate() {
       return null;
     }

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

@@ -41,6 +41,7 @@ import org.thoughtcrime.securesms.mms.PartAuthority
 import org.thoughtcrime.securesms.permissions.Permissions
 import org.thoughtcrime.securesms.recipients.Recipient
 import org.thoughtcrime.securesms.util.DateUtils
+import org.thoughtcrime.securesms.util.Debouncer
 import org.thoughtcrime.securesms.util.FullscreenHelper
 import org.thoughtcrime.securesms.util.LifecycleDisposable
 import org.thoughtcrime.securesms.util.MediaUtil
@@ -49,6 +50,7 @@ import org.thoughtcrime.securesms.util.StorageUtil
 import org.thoughtcrime.securesms.util.ViewUtil
 import java.util.Locale
 import java.util.Optional
+import java.util.concurrent.TimeUnit
 
 class MediaPreviewV2Fragment : Fragment(R.layout.fragment_media_preview_v2), MediaPreviewFragment.Events {
   private val TAG = Log.tag(MediaPreviewV2Fragment::class.java)
@@ -56,6 +58,8 @@ class MediaPreviewV2Fragment : Fragment(R.layout.fragment_media_preview_v2), Med
   private val lifecycleDisposable = LifecycleDisposable()
   private val binding by ViewBinderDelegate(FragmentMediaPreviewV2Binding::bind)
   private val viewModel: MediaPreviewV2ViewModel by viewModels()
+  private val debouncer = Debouncer(2, TimeUnit.SECONDS)
+
 
   private lateinit var fullscreenHelper: FullscreenHelper
 
@@ -337,6 +341,14 @@ class MediaPreviewV2Fragment : Fragment(R.layout.fragment_media_preview_v2), Med
     viewModel.setMediaReady()
   }
 
+  override fun onPlaying() {
+    debouncer.publish { fullscreenHelper.hideSystemUI() }
+  }
+
+  override fun onStopped() {
+    debouncer.clear()
+  }
+
   private fun forward(mediaItem: MediaDatabase.MediaRecord) {
     val attachment = mediaItem.attachment
     val uri = attachment?.uri

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

@@ -74,10 +74,12 @@ public final class VideoMediaPreviewFragment extends MediaPreviewFragment {
         if (!isVideoGif && activity instanceof VoiceNoteMediaControllerOwner) {
           ((VoiceNoteMediaControllerOwner) activity).getVoiceNoteMediaController().pausePlayback();
         }
+        events.onPlaying();
       }
 
       @Override
       public void onStopped() {
+        events.onStopped();
       }
 
       @Override

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

@@ -107,7 +107,11 @@ public class VideoPlayer extends FrameLayout {
           switch (playbackState) {
             case Player.STATE_READY:
               playerCallback.onReady();
-              if (playWhenReady) playerCallback.onPlaying();
+              if (playWhenReady) {
+                playerCallback.onPlaying();
+              } else {
+                playerCallback.onStopped();
+              }
               break;
             case Player.STATE_ENDED:
               playerCallback.onStopped();