Android初级教程_onKeyDown监听返回键无效

当我们的Activity继承了TabActivity,在该类中重写onKeyDown是监听不到返回键的,

具体解决方法如下:

重写dispatchKeyEvent

/** * 退出 */@Overridepublic boolean dispatchKeyEvent(KeyEvent event) {if (event.getKeyCode() == KeyEvent.KEYCODE_BACK&& event.getAction() == KeyEvent.ACTION_DOWN&& event.getRepeatCount() == 0) {//具体的操作代码}return super.dispatchKeyEvent(event);}

---------------------------------------------------------------后续2012-8-23-----------------------------------------

如果仅仅是监听某个Activity的后退键,只需要覆写该方法即可.

@Overridepublic void onBackPressed() {super.onBackPressed();}

我们可以看看super.onBackPressed()方法默认的实现:

    /**     * 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();    }

如果想屏蔽后退键只需要把super.onBackPressed()方法注释即可

但是该方法不适用于TabActivity.

欢迎转载:http://blog.csdn.net/johnny901114/article/details/7822878

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