android控制home键 代码

@Override
public   void  onAttachedToWindow() {
    // TODO Auto-generated method stub
    this .getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
    super.onAttachedToWindow();
}
@Override
public  boolean onKeyDown( int  keyCode, KeyEvent  event ) {
    // TODO Auto-generated method stub
    switch (keyCode) {
    case  KeyEvent.KEYCODE_BACK:
        Log.e("Test" ,  "onKeyDown KEYCODE_BACK" );
        break ;
    case  KeyEvent.KEYCODE_HOME:
        Log.e("Test" ,  "onKeyDown KEYCODE_HOME" );
        break ;
    }
    return   false ;
}