2 files changed, 27 insertions, 12 deletions
diff --git a/core/tests/coretests/src/android/graphics/drawable/AdaptiveIconDrawableTest.java b/core/tests/coretests/src/android/graphics/drawable/AdaptiveIconDrawableTest.java
index b28a4b5ae628..781e343e8139 100644
--- a/core/tests/coretests/src/android/graphics/drawable/AdaptiveIconDrawableTest.java
+++ b/core/tests/coretests/src/android/graphics/drawable/AdaptiveIconDrawableTest.java
@@ -1,15 +1,11 @@
 package android.graphics.drawable;
 
-import static org.junit.Assert.assertTrue;
-
 import android.content.res.Resources;
 import android.graphics.Bitmap;
 import android.graphics.Bitmap.Config;
-import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Outline;
-import android.graphics.Paint;
 import android.graphics.Path;
 import android.graphics.Path.Direction;
 import android.graphics.Rect;
@@ -19,10 +15,12 @@ import android.support.test.filters.LargeTest;
 import android.test.AndroidTestCase;
 import android.util.Log;
 import android.util.PathParser;
+
+import org.junit.Test;
+
 import java.io.File;
 import java.io.FileOutputStream;
 import java.util.Arrays;
-import org.junit.Test;
 
 @LargeTest
 public class AdaptiveIconDrawableTest extends AndroidTestCase {
@@ -173,6 +171,28 @@ public class AdaptiveIconDrawableTest extends AndroidTestCase {
         assertTrue("outline path should be convex", outline.mPath.isConvex());
     }
 
+    @Test
+    public void testSetAlpha() throws Exception {
+        mIconDrawable = new AdaptiveIconDrawable(mBackgroundDrawable, mForegroundDrawable);
+        mIconDrawable.setBounds(0, 0, 100, 100);
+
+        Bitmap bitmap = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888);
+        Canvas canvas = new Canvas(bitmap);
+
+        mIconDrawable.draw(canvas);
+        assertEquals(255, Color.alpha(bitmap.getPixel(50, 50)));
+
+        mIconDrawable.setAlpha(200);
+        bitmap.eraseColor(Color.TRANSPARENT);
+        mIconDrawable.draw(canvas);
+        assertEquals(200, Color.alpha(bitmap.getPixel(50, 50)));
+
+        mIconDrawable.setAlpha(100);
+        bitmap.eraseColor(Color.TRANSPARENT);
+        mIconDrawable.draw(canvas);
+        assertEquals(100, Color.alpha(bitmap.getPixel(50, 50)));
+    }
+
     //
     // Utils
     //
diff --git a/graphics/java/android/graphics/drawable/AdaptiveIconDrawable.java b/graphics/java/android/graphics/drawable/AdaptiveIconDrawable.java
index 1d0cfa5ff082..fdd638adba81 100644
--- a/graphics/java/android/graphics/drawable/AdaptiveIconDrawable.java
+++ b/graphics/java/android/graphics/drawable/AdaptiveIconDrawable.java
@@ -44,6 +44,7 @@ import android.util.DisplayMetrics;
 import android.util.PathParser;
 
 import com.android.internal.R;
+
 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
 
@@ -668,13 +669,7 @@ public class AdaptiveIconDrawable extends Drawable implements Drawable.Callback
 
     @Override
     public void setAlpha(int alpha) {
-        final ChildDrawable[] array = mLayerState.mChildren;
-        for (int i = 0; i < mLayerState.N_CHILDREN; i++) {
-            final Drawable dr = array[i].mDrawable;
-            if (dr != null) {
-                dr.setAlpha(alpha);
-            }
-        }
+        mPaint.setAlpha(alpha);
     }
 
     @Override