Loading data and updating the user interface

Question

There are several things that push me to the process of loading data and notifying the user interface in Android. I use ( Intent) Serviceto load data that works quite well.

I am not sure how to deal with the notification of the user interface that the data has been received. After some research and discussion in Downloading data using IntentService - Lifecycle Changes and What is the best way to communicate between a service and an activity? I arrive at a point where I am not sure which method to use more.

The alternatives I'm looking for are as follows:

• Service + LocalBroadcasts + Databases
  • An Activitywill launchService
  • Service will load data into the database
  • Servicewill send Broadcastwith a notification of 'done'
  • Activitywill get this Broadcastand retrieve data from the database usingAsyncTask
  • Activitywill retrieve data from the database with AsyncTaskeach time it is displayed to the user ( onResume, for cases where he missed the broadcast due to user transition).
• Service + ResultReceivers + Databases
  • An Activitywill launchService
  • Service will load data into the database
  • Servicewill notify ResultReceiverwhat he did
  • Activity will retrieve data from the database using AsyncTask
  • Instead of retrieving data each time, it is ResultReceiverreused to change the life cycle, and notifications are not lost.
• Service + ResultReceivers + Bundle
  • An Activitywill launchService
  • Service will load data (optional to the database)
  • Service ResultReceiver, , Bundle.
  • Activity Bundle ( AsyncTask).
  • , , ResultReceiver , .

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- ?

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Answer 1

- DataManager singleton, , , . ResultReceiver s, DataManager.

, ResultReceiver Broadcast , . , GC - .