[Android]设置Activity为全屏显示的两种方法

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

示例:   
<application 
        android:icon="@drawable/ic_launcher" 
        android:label="@string/app_name" 
        android:theme=" ​@android​ :style/Theme.NoTitleBar.Fullscreen"> 
        <activity 
            android:name=".MainActivity"> 
            <intent-filter> 
                <action android:name="android.intent.action.MAIN" /> 

                <category android:name="android.intent.category.LAUNCHER" /> 
            </intent-filter> 
        </activity> 
    </application> 

 2. 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);