Android：当应用关闭时执行某些操作

Question

I want when user close my app it update SQLite data then close app. I used onPause() , onStop() and onDestroy() method in different time on MainActivity . All methods work when app close.

But The problem is , onStop() , onPause() and onDestroy() are called when I change activity. But I don't want to do it when I change activity, only when I close my app.

How I can do that?

Thank you for your response.

Answer 1

The app will be closed

1.When user pressed back button in Main activity

2.When you call finish() method programmatically

Hence, You can use onBackPressed() method ,

 @Override
    public void onBackPressed() {
        //do your action
        finish();

    }

If you are finishing main activity programmatically, Then do your task before calling finish()

Edit

As you mentioned,

3.when the app is closed from recent activities,

Activity will be closed instantly. Activity Life cycle is not considered. Even onDestroy() method will not be invoked. Hence You can use service to detect that.

There is a method called onTaskRemoved() which can be used in your service

 @Override
    public void onTaskRemoved(Intent rootIntent) {
        //do your task;
    }

You can get more info from this source