Fix action bar background not wide enough on tablets

Change-Id: I82e444dc913429c77c768afada24e10c12c79160
Fix: 37475599
Test: make RunSettingsRoboTests
diff --git a/src/com/android/settings/applications/AppHeaderController.java b/src/com/android/settings/applications/AppHeaderController.java
index 29acaa4..0cfd024 100644
--- a/src/com/android/settings/applications/AppHeaderController.java
+++ b/src/com/android/settings/applications/AppHeaderController.java
@@ -25,6 +25,7 @@
 import android.content.Intent;
 import android.content.pm.PackageInfo;
 import android.content.pm.ResolveInfo;
+import android.graphics.drawable.ColorDrawable;
 import android.graphics.drawable.Drawable;
 import android.os.UserHandle;
 import android.support.annotation.IntDef;
@@ -220,9 +221,8 @@
             Log.w(TAG, "No actionbar, cannot style actionbar.");
             return this;
         }
-        final Drawable appHeaderBackground =
-                mAppHeader.findViewById(R.id.app_snippet).getBackground();
-        actionBar.setBackgroundDrawable(appHeaderBackground);
+        actionBar.setBackgroundDrawable(
+                new ColorDrawable(Utils.getColorAttr(activity, android.R.attr.colorSecondary)));
         actionBar.setElevation(0);
 
         return this;
diff --git a/tests/robotests/src/com/android/settings/applications/AppHeaderControllerTest.java b/tests/robotests/src/com/android/settings/applications/AppHeaderControllerTest.java
index 030978f..bff94a4 100644
--- a/tests/robotests/src/com/android/settings/applications/AppHeaderControllerTest.java
+++ b/tests/robotests/src/com/android/settings/applications/AppHeaderControllerTest.java
@@ -33,7 +33,7 @@
 import android.content.pm.ActivityInfo;
 import android.content.pm.PackageInfo;
 import android.content.pm.ResolveInfo;
-import android.graphics.drawable.Drawable;
+import android.graphics.drawable.ColorDrawable;
 import android.os.UserHandle;
 import android.support.v7.preference.Preference;
 import android.view.LayoutInflater;
@@ -323,10 +323,11 @@
         mController.styleActionBar(mActivity);
 
         verify(actionBar).setElevation(0);
-        verify(actionBar).setBackgroundDrawable(any(Drawable.class));
+        // Enforce a color drawable as background here, as image based drawables might not be
+        // wide enough to cover entire action bar.
+        verify(actionBar).setBackgroundDrawable(any(ColorDrawable.class));
     }
 
-
     @Test
     public void initAppHeaderController_appHeaderNull_useFragmentContext() {
         mController = new AppHeaderController(mContext, mFragment, null);