onPause() or onStop() [closed]

问题:

This isn't working the way I expected. However, the way I expect it to work is probably wrong.

I have an application that implements a Countdown timer. When the back button on the android phone is clicked the user is navigated back to the main screen. However, the countdown timer still runs in the background. I can tell as it performs a beer at certain intervals.

I thought if I implemented onPause() I would be able to call countdowntimer.cancel(). And it would cancel the count down timer when the user exits the activity via the back button. However, the application fails instead.

I have also tried a similar approach with onStop() but it just doesn't work.

I don't have my code with me at the moment, it's just on my mind. Also sorry if there are any mistakes on this post, I have written it on my phone.

回答1:

onPause() call when one Activity transfer control to another Activity, and onStop() method call when Activity in finish mode.

回答2:

Try:

movetasktoback(true);//in the onbackpressed

Then use the:

countdowntimer.cancel();// in onpause

After that you can call finish() in onpause().

回答3:

why dont you call countdowntimer.cancel() when back key is pressed you can override back click like

@Override
     public boolean onKeyDown(int keyCode, KeyEvent event)  {
         if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
             countdowntimer.cancel();
         }

         return super.onKeyDown(keyCode, event);
     }