Add setBackgroundColor() in VideoPreference

- Add setBackgroundColor() to allow changed background
  color of VideoPreference.
- Add test case.

Bug: 149974597
Test: make -j42 RunSettingsRoboTests
Change-Id: I14f849d54657dc0ccbd599c393de6f430e9352d4

tests/robotests/src/com/android/settings/widget/VideoPreferenceTest.java

@@ -32,6 +32,7 @@ import android.view.LayoutInflater;
 import android.view.TextureView;
 import android.view.View;
 import android.widget.ImageView;
+import android.widget.LinearLayout;
 
 import androidx.preference.PreferenceFragmentCompat;
 import androidx.preference.PreferenceViewHolder;
@@ -60,6 +61,9 @@ public class VideoPreferenceTest {
     private ImageView fakePreview;
     @Mock
     private ImageView fakePlayButton;
+    @Mock
+    private LinearLayout mAnimationView;
+
     private Context mContext;
     private VideoPreference mVideoPreference;
     private PreferenceViewHolder mPreferenceViewHolder;
@@ -73,6 +77,7 @@ public class VideoPreferenceTest {
                 new MediaAnimationController(mContext, R.raw.accessibility_screen_magnification));
         mVideoPreference = new VideoPreference(mContext, null /* attrs */);
         mVideoPreference.mAnimationController = mAnimationController;
+        mVideoPreference.mAnimationView = mAnimationView;
         when(mAnimationController.getVideoWidth()).thenReturn(VIDEO_WIDTH);
         when(mAnimationController.getVideoHeight()).thenReturn(VIDEO_HEIGHT);
 
@@ -157,6 +162,13 @@ public class VideoPreferenceTest {
         assertThat(vp2.mAnimationController instanceof VectorAnimationController).isTrue();
     }
 
+    @Test
+    public void setBackgroundColor_shouldBeCalled() {
+        mVideoPreference.setBackgroundColor(1111);
+
+        assertThat(mVideoPreference.mBackgroundResId).isEqualTo(1111);
+    }
+
     public static class TestFragment extends PreferenceFragmentCompat {
         @Override
         public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {