设置Activity为全屏显示的两种方法

方法1：AndroidManifest.xml 里，Activity的 android:theme 指定为" @android :style/Theme.NoTitleBar.Fullscreen"
示例:

        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme=" @android :style/Theme.NoTitleBar.Fullscreen">

            android:name=".MainActivity">

方法2：在onCreate()里指定No title
要加入：

      /*set it to be no title*/
      requestWindowFeature(Window.FEATURE_NO_TITLE);
       /*set it to be full screen*/
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);

示例：
    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
        /*set it to be no title*/
        requestWindowFeature(Window.FEATURE_NO_TITLE);

        /*set it to be full screen*/
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setContentView(R.layout.activity_main);

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