Android 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

//因为Activity继承了TabActivity,所以不能监听到onKeyDown()方法，重写以下方法@Overridepublic boolean dispatchKeyEvent(KeyEvent event) {if (event.getKeyCode() == KeyEvent.KEYCODE_BACK  && event.getAction() == KeyEvent.ACTION_DOWN  && event.getRepeatCount() == 0) {             //exitBy2Click();      //调用双击退出函数 sysExit();} return super.dispatchKeyEvent(event);}