CODEWITHSUNDEEP
android
ZZ 5
ZZ 5

Reputation: 1954

Do certain action every time the app is closing

I'd like to do certain, simple action every time that my app is closing - I just want to decrease int variable. How to do that?

Upvotes: 1

Views: 2708

Answers (2)

TeeTracker
TeeTracker

Reputation: 7350

The question is what you mean "close"?
If you close all your Activities, the App-process might still be running. If you mean that the "close" is just closing all of your Activities. You might define a "count" for all opening Activities, you can store it in DB or SharePerference. I think you can do follow(dummy codes):
In your project, you should define BasicActivity:

    public class BasicActivity extends Activity {
     onCreate() {
         mPreference.incActivityCount();//++
         super.onCreate();
     }

     onDestory() {
         mPreference.decActivityCount();//--
         if( mPreference.getActivity() == 0 ) {
             //All being opened Activities have been closed.
             onAppHasNoUIs();
         }
         super.onDestory();
     }

     onAppHasNoUIs() {
            //All being opened Activities have been closed.
     }
}

Upvotes: 1

Shobhit Puri
Shobhit Puri

Reputation: 26007

As @Ozair has rightly asked that it depends what do you define as closing of app.

You can do either or both of the following depending on the need:

  1. If you want to detect closing of app by use of BACK button, then from within your last activity, you can detect the pressing of BACK button by overriding onBackPressed function. There you can decrement your value.

  2. If you are also considering the situation when you app goes into the background by pressing of HOME button, then in your activities you would have to detect the HOME button pressed. There have been many solutions which no more work for detecting HOME button but this answer on How can I detect user pressing HOME key in my activity? question seems to work for me. So, there you can detect the HOME button and decrement the value which you can save in SharedPreferece.

There can be other cases where you are calling finish() and closing your last activity. It is not clear from your question if you are considering that case as well.

Hope this gives you some opportunity to think about it.

Upvotes: 2

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