Android TabActivity中onKeyDown无效有关问题

1.当继承TabActivity时，同学们是不是onKeyDown方法没用，那是应为冲突了，可以用dispatchKeyEvent方法

public boolean dispatchKeyEvent(KeyEvent event) {		if (event.getKeyCode() == KeyEvent.KEYCODE_BACK				&&event.getAction() == KeyEvent.ACTION_DOWN				&& event.getRepeatCount() == 0) {				return false;	}}

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?2.也可以到TabActivity的子Activity用onKeyDown

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3.当有双重TabActivity时可以用

public boolean onKeyDown(int keyCode, KeyEvent event) {
??????? if(keyCode==KeyEvent.KEYCODE_BACK && event.getRepeatCount()==0){
?????????? ??TouchListenerUtils.Back(this.getParent().getParent());
????????? return false;??????
??????? }else{
??????????? return super.onKeyDown(keyCode, event);
??????? }
??? }

getParent().是指父类的