| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License |
| */ |
| package android.support.v17.leanback.widget; |
| |
| import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP; |
| |
| import android.graphics.drawable.Drawable; |
| import android.os.Build; |
| import android.support.annotation.RestrictTo; |
| import android.view.View; |
| |
| /** |
| * Helper for view backgrounds. |
| * @hide |
| */ |
| @RestrictTo(LIBRARY_GROUP) |
| public final class BackgroundHelper { |
| public static void setBackgroundPreservingAlpha(View view, Drawable drawable) { |
| if (Build.VERSION.SDK_INT >= 19) { |
| if (view.getBackground() != null) { |
| drawable.setAlpha(view.getBackground().getAlpha()); |
| } |
| view.setBackground(drawable); |
| } else { |
| // Cannot query drawable alpha |
| view.setBackground(drawable); |
| } |
| } |
| } |