Android开发实现Launcher3应用列表修改透明背景的方法

<com.android.launcher3.appscustomizetabhost
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:launcher="http://schemas.android.com/apk/res/com.android.launcher"
android:background="#FF000000">

<com.android.launcher3.appscustomizetabhost
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:launcher="http://schemas.android.com/apk/res/com.android.launcher"
android:background="#00000000">

<frameLayout
android:id="@+id/animation_buffer" 
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF000000"
android:visibility="gone" />

<frameLayout
 android:id="@+id/animation_buffer" 
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00000000"
android:visibility="gone" />

private void onTabChangedEnd(AppsCustomizePagedView.ContentType type) {
    int bgAlpha = (int) (255 * (getResources().getInteger(
      R.integer.config_appsCustomizeSpringLoadedBgAlpha) / 100f));
    setBackgroundColor(Color.argb(bgAlpha, 0, 0, 0));
    mAppsCustomizePane.setContentType(type);
}