Release IllustrationVideoView in onStop. DO NOT MERGE

Based on the view's visibility, release or reattach
IllustrationVideoView as soon as it becomes invisible to avoid
media player resources being held on for a long time, and to avoid
multiple video views being released all at once at the end of setup
wizard.

Test: ./gradlew test connectedAndroidTest
Bug: 78360819
Bug: 117581782
Change-Id: Idc5af901122562d12ff3d7b1ee46012b7a60cf25
(cherry picked from commit 6ffb792f46)

library/main/src/com/android/setupwizardlib/view/IllustrationVideoView.java

@@ -64,6 +64,8 @@ public class IllustrationVideoView extends TextureView implements Animatable,
 
     @VisibleForTesting Surface mSurface;
 
+    protected int mWindowVisibility;
+
     public IllustrationVideoView(Context context, AttributeSet attrs) {
         super(context, attrs);
         final TypedArray a = context.obtainStyledAttributes(attrs,
@@ -124,7 +126,7 @@ public class IllustrationVideoView extends TextureView implements Animatable,
      * Creates a media player for the current URI. The media player will be started immediately if
      * the view's window is visible. If there is an existing media player, it will be released.
      */
-    private void createMediaPlayer() {
+    protected void createMediaPlayer() {
         if (mMediaPlayer != null) {
             mMediaPlayer.release();
         }
@@ -149,11 +151,35 @@ public class IllustrationVideoView extends TextureView implements Animatable,
         } else {
             Log.wtf(TAG, "Unable to initialize media player for video view");
         }
-        if (getWindowVisibility() == View.VISIBLE) {
+        if (mWindowVisibility == View.VISIBLE) {
             start();
         }
     }
 
+    protected void createSurface() {
+        if (mSurface != null) {
+            mSurface.release();
+            mSurface = null;
+        }
+        // Reattach only if it has been previously released
+        SurfaceTexture surfaceTexture = getSurfaceTexture();
+        if (surfaceTexture != null) {
+            setVisibility(View.INVISIBLE);
+            mSurface = new Surface(surfaceTexture);
+        }
+    }
+
+    @Override
+    protected void onWindowVisibilityChanged(int visibility) {
+        super.onWindowVisibilityChanged(visibility);
+        mWindowVisibility = visibility;
+        if (visibility == View.VISIBLE) {
+            reattach();
+        } else {
+            release();
+        }
+    }
+
     /**
      * Whether the media player should play the video in a continuous loop. The default value is
      * true.
@@ -178,14 +204,34 @@ public class IllustrationVideoView extends TextureView implements Animatable,
         }
     }
 
+    private void reattach() {
+        if (mSurface == null) {
+            initVideo();
+        }
+    }
+
+    private void initVideo() {
+        if (mWindowVisibility != View.VISIBLE) {
+            return;
+        }
+        createSurface();
+        if (mSurface != null) {
+            createMediaPlayer();
+        } else {
+            Log.w("IllustrationVideoView", "Surface creation failed");
+        }
+    }
+
+    protected void onRenderingStart() {
+    }
+
     /* SurfaceTextureListener methods */
 
     @Override
     public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) {
         // Keep the view hidden until video starts
         setVisibility(View.INVISIBLE);
-        mSurface = new Surface(surfaceTexture);
-        createMediaPlayer();
+        initVideo();
     }
 
     @Override
@@ -230,6 +276,7 @@ public class IllustrationVideoView extends TextureView implements Animatable,
         if (what == MediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START) {
             // Video available, show view now
             setVisibility(View.VISIBLE);
+            onRenderingStart();
         }
         return false;
     }

library/test/robotest/src/com/android/setupwizardlib/view/IllustrationVideoViewTest.java

@@ -16,6 +16,8 @@
 
 package com.android.setupwizardlib.view;
 
+import static com.google.common.truth.Truth.assertThat;
+
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.fail;
@@ -31,6 +33,7 @@ import android.media.MediaPlayer;
 import android.os.Build.VERSION_CODES;
 import android.support.annotation.RawRes;
 import android.view.Surface;
+import android.view.View;
 
 import com.android.setupwizardlib.R;
 import com.android.setupwizardlib.robolectric.SuwLibRobolectricTestRunner;
@@ -90,6 +93,30 @@ public class IllustrationVideoViewTest {
         }
     }
 
+    @Test
+    public void onVisibilityChanged_notVisible_shouldRelease() {
+        createDefaultView();
+        mView.onWindowVisibilityChanged(View.GONE);
+
+        verify(ShadowMockMediaPlayer.sMediaPlayer).release();
+        assertThat(mView.mSurface).isNull();
+        assertThat(mView.mMediaPlayer).isNull();
+    }
+
+    @Test
+    public void onVisibilityChanged_visible_shouldPlay() {
+        createDefaultView();
+
+        mView.onWindowVisibilityChanged(View.GONE);
+        assertThat(mView.mSurface).isNull();
+        assertThat(mView.mMediaPlayer).isNull();
+
+        mView.onWindowVisibilityChanged(View.VISIBLE);
+
+        assertThat(mView.mSurface).isNotNull();
+        assertThat(mView.mMediaPlayer).isNotNull();
+    }
+
     @Test
     public void testPausedWhenWindowFocusLost() {
         createDefaultView();
@@ -148,6 +175,7 @@ public class IllustrationVideoViewTest {
                         // Any resource attribute should work, since the media player is mocked
                         .addAttribute(R.attr.suwVideo, "@android:color/white")
                         .build());
+        mView.setSurfaceTexture(mock(SurfaceTexture.class));
         mView.onSurfaceTextureAvailable(mSurfaceTexture, 500, 500);
     }