android屏蔽返回键跟Home键

//屏蔽返回键的代码:public boolean onKeyDown(int keyCode,KeyEvent event){	switch(keyCode)	{		case KeyEvent.KEYCODE_HOME:return true;		case KeyEvent.KEYCODE_BACK:return true;		case KeyEvent.KEYCODE_CALL:return true;		case KeyEvent.KEYCODE_SYM: return true;		case KeyEvent.KEYCODE_VOLUME_DOWN: return true;		case KeyEvent.KEYCODE_VOLUME_UP: return true;		case KeyEvent.KEYCODE_STAR: return true;	}	return super.onKeyDown(keyCode, event);}

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//屏蔽home键的代码:public void onAttachedToWindow() {	this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);	super.onAttachedToWindow();}