Question

I am developing an Android application with number of activities. My MainActivity (Starting activity) has code to fetch updated data from server. I want to fetch updated data from server every time user launch application (1st launch or move application in foreground).
1st launch is fine i fetch data. But when user is on some other activity and minimize my app and open again it starts from last state. At this point how can i detect application is starting again so that i can fetch data again.

I have already checked onResume(), onPause() methods but they belong to individual activities. I want to catch event on application level, as we normally do in iOS applications.

Answer 1

AFAIK you can’t. You’ll have to find a way to filter the onResume()/onPause() from all the activities to find out the application went to background.

A suggestion:

 public abstract class AbstractActivity extends Activity{
    private static long pauseTime=0;
    private static final long MIN_PAUSE_TIME = 3000;

    protected void onPause(){
      super.onPause();
      pauseTime = System.currentTimeMillis();
    }

    protected void onResume(){
      super.onResume();
      if(System.currentTimeMillis()-pauseTime > MIN_PAUSE_TIME){
         // do server stuff
      }
    }
 }

and then make all your activities extend this one.