android开发：全屏和退出全屏

xml代码：

<Button
        android:id="@+id/button5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/fullscreen" 
        android:onClick="changescreen"/>

java代码：

private static boolean isfull=true;
    //全屏设置和退出全屏
    private void setFullScreen(){
         //requestWindowFeature(Window.FEATURE_NO_TITLE); 
         getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
         isfull=true;
    }
    private void quitFullScreen(){
          final WindowManager.LayoutParams attrs = getWindow().getAttributes();
          attrs.flags &= (~WindowManager.LayoutParams.FLAG_FULLSCREEN);
          getWindow().setAttributes(attrs);
          getWindow().clearFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
          //requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
          isfull=false;
    }
    
    public void changescreen(View view)
    {
        if(isfull==true)
        {
            quitFullScreen();
        }
        else
        {
            setFullScreen();
        }
    }

附加：开始设置无title，全屏

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // remove title bar       
        this.requestWindowFeature(Window.FEATURE_NO_TITLE); 
        // full screen   
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);  

        setContentView(R.layout.main);
    }