Android 如何屏蔽Home键

Android 如何屏蔽Home键（长按短按都不起作用）。

packagecom.test.qiao;

importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.view.KeyEvent;
importandroid.view.WindowManager;

publicclassZZZActivityextendsActivity{

privatebooleanflag=true;//true位屏蔽，false位不屏蔽

@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
@Override
publicvoidonAttachedToWindow(){
if(flag){
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
}
super.onAttachedToWindow();
}

@Override
publicbooleanonKeyDown(intkeyCode,KeyEventevent){
if(keyCode==KeyEvent.KEYCODE_HOME){
returntrue;
}
returnsuper.onKeyDown(keyCode,event);
}
}