Android : Dropbox on Android - sync not terminated

After linking my Dropbox account, I try to gather and store the datastore names inside of my local database. All is fine when I'm debugging my app, I can find all names inside of the datastore as well. But when I'm running the app without debugging, my database seems empty.

I think there is a problem of syncing, somebody could give me clue? I haven't found out solution corresponding to my issue.

This is the part of the code in question:

private void gatherData(){

        db = new SQliteHelper( this ) ;
        Set<DbxDatastoreInfo> datastorePresent = null ;



        try {
            datastorePresent = mDatastoreManager.listDatastores();
        } catch (DbxException e1) {
            e1.printStackTrace();
        }

        Iterator<DbxDatastoreInfo> datastoreLoop = datastorePresent.iterator() ;
        while (datastoreLoop.hasNext()){

            TitleList tit = new TitleList(datastoreLoop.next().id) ;
            tit.setConnectDropbox();
            db.addLists(tit);

        }

        mDatastoreManager.shutDown();

          Intent returnIntent = new Intent();
          boolean syncOK = true ;
          returnIntent.putExtra("result", syncOK) ;
          setResult(RESULT_OK, returnIntent);
          finish();


    }