Android随便时刻、任意代码处全屏

public void toggleFullscreen(boolean fullScreen) {  //fullScreen为true时全屏，否则相反       WindowManager.LayoutParams attrs = getWindow().getAttributes();          if (fullScreen)     {         attrs.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;     }     else     {         attrs.flags &= ~WindowManager.LayoutParams.FLAG_FULLSCREEN;     }          getWindow().setAttributes(attrs); }