Android onKeyDown監聽返回鍵無效

當我們的Activity繼承了TabActivity,在該類中重寫onKeyDown是監聽不到返回鍵的,

具體解決方法如下:

重寫dispatchKeyEvent

    /**
     * 退出
     */
    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        if (event.getKeyCode() == KeyEvent.KEYCODE_BACK
                && event.getAction() == KeyEvent.ACTION_DOWN
                && event.getRepeatCount() == 0) {            
            //具體的操作代碼
        }
        return super.dispatchKeyEvent(event);
    }

---------------------------------------------------------------后續2012-8-23-----------------------------------------

如果僅僅是監聽某個Activity的后退鍵,只需要覆寫該方法即可.

    @Override
    public void onBackPressed() {
        super.onBackPressed();
    }

我們可以看看super.onBackPressed()方法默認的實現:

    /**
     * Called when the activity has detected the user's press of the back
     * key.  The default implementation simply finishes the current activity,
     * but you can override this to do whatever you want.
     */
    public void onBackPressed() {
        finish();
    }

如果想屏蔽后退鍵只需要把super.onBackPressed()方法注釋即可

但是該方法不適用於TabActivity.

歡迎轉載:http://blog.csdn.net/johnny901114/article/details/7822878