How to catch event of coming back to an activity after hitting back

I have a main screen for my applicat开发者_运维百科ion which then leads to different screens, from each of those hitting back takes you back to the main screen. I want to do some stuff every time a user is "coming back" to the main screen, How do I catch this kind of event???

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Use onResume() method in your main activity or Use startActivityForResult method in your activity by overriding the keyDown method in sub activities,it may help you

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you cand try this:

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
       if ((keyCode == KeyEvent.KEYCODE_BACK)) {
       //your stuff goes here
       }
    return super.onKeyDown(keyCode, event);
    }

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You could do something like -

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
       // Do your stuff
       return true;
   }
   return super.onKeyDown(keyCode, event);
}