Add backgroundColor getter to View

Change-Id: I3a75169a2e91ec712fb1db4d130089a1261fc66b
diff --git a/api/current.txt b/api/current.txt
index 72cd85a..cacb557 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -33645,6 +33645,7 @@
     method public android.view.animation.Animation getAnimation();
     method public android.os.IBinder getApplicationWindowToken();
     method public android.graphics.drawable.Drawable getBackground();
+    method public int getBackgroundColor();
     method public android.content.res.ColorStateList getBackgroundTintList();
     method public android.graphics.PorterDuff.Mode getBackgroundTintMode();
     method public int getBaseline();
diff --git a/core/java/android/view/View.java b/core/java/android/view/View.java
index 7033676..d867adf 100644
--- a/core/java/android/view/View.java
+++ b/core/java/android/view/View.java
@@ -16235,6 +16235,19 @@
     }
 
     /**
+     * If the view has a ColorDrawable background, returns the color of that
+     * drawable.
+     *
+     * @return The color of the ColorDrawable background, if set, otherwise 0.
+     */
+    public int getBackgroundColor() {
+        if (mBackground instanceof ColorDrawable) {
+            return ((ColorDrawable) mBackground).getColor();
+        }
+        return 0;
+    }
+
+    /**
      * Set the background to a given resource. The resource should refer to
      * a Drawable object or 0 to remove the background.
      * @param resid The identifier of the resource.
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/ActivatableNotificationView.java b/packages/SystemUI/src/com/android/systemui/statusbar/ActivatableNotificationView.java
index 465a141..e021cd4 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/ActivatableNotificationView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/ActivatableNotificationView.java
@@ -388,7 +388,7 @@
     }
 
     private void updateBackgroundTint() {
-        int color = getBackgroundColor();
+        int color = getBgColor();
         int rippleColor = getRippleColor();
         if (color == mNormalColor) {
             // We don't need to tint a normal notification
@@ -652,7 +652,7 @@
     }
 
     private void updateAppearAnimationAlpha() {
-        int backgroundColor = getBackgroundColor();
+        int backgroundColor = getBgColor();
         if (backgroundColor != -1) {
             float contentAlphaProgress = mAppearAnimationFraction;
             contentAlphaProgress = contentAlphaProgress / (1.0f - ALPHA_ANIMATION_END);
@@ -666,7 +666,7 @@
         }
     }
 
-    private int getBackgroundColor() {
+    private int getBgColor() {
         if (mBgTint != 0) {
             return mBgTint;
         } else if (mShowingLegacyBackground) {