Transferring to a cast device should not close the output switcher

-Close panel only when on pause and stop
-Transfer device would set the play state to "STATE_NONE"
-Add test case

Bug: 152632226
Test: make -j42 RunSettingsRoboTests
Change-Id: Ibf6ce1454b1d5bf3facc07abec15b8735029f2cf

src/com/android/settings/panel/MediaOutputPanel.java

@@ -259,7 +259,9 @@ public class MediaOutputPanel implements PanelContent, LocalMediaManager.DeviceC
 
         @Override
         public void onPlaybackStateChanged(PlaybackState state) {
-            if (mCallback != null && state.getState() != PlaybackState.STATE_PLAYING) {
+            final int playState = state.getState();
+            if (mCallback != null && (playState == PlaybackState.STATE_STOPPED
+                    || playState == PlaybackState.STATE_PAUSED)) {
                 mCallback.forceClose();
             }
         }

tests/robotests/src/com/android/settings/panel/MediaOutputPanelTest.java

@@ -295,4 +295,19 @@ public class MediaOutputPanelTest {
 
         verify(mCallback).forceClose();
     }
+
+    @Test
+    public void onPlaybackStateChanged_stateFromPlayingToPaused_verifyCallForceClose() {
+        mPanel.onStart();
+        verify(mMediaController).registerCallback(mControllerCbs.capture());
+        final MediaController.Callback controllerCallbacks = mControllerCbs.getValue();
+        when(mPlaybackState.getState()).thenReturn(PlaybackState.STATE_PLAYING);
+        controllerCallbacks.onPlaybackStateChanged(mPlaybackState);
+        verify(mCallback, never()).forceClose();
+
+        when(mPlaybackState.getState()).thenReturn(PlaybackState.STATE_PAUSED);
+        controllerCallbacks.onPlaybackStateChanged(mPlaybackState);
+
+        verify(mCallback).forceClose();
+    }
 }