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

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();        }    }

@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);    }