Java文件：

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protected void onCreate(Bundle savedInstanceState) {
    /* ... */
    //透明状态栏          
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
}

Xml文件：

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android:background="@drawable/background"