How can I update information in an Android Activity from a background Service

by

How can I set up my Activity to be
listening to the Service? Is this the
best way to approach this problem?

You have three major options, as I see it:

  1. Polling. The Activity periodically asks the Service for the latest data. IMHO, this option sucks, but it’s certainly possible.

  2. Callbacks. Per jax’s answer, the Activity registers a callback object (“observer”) with the Service. The Service invokes a method on the callback when the data changes, which in turn updates the UI. You can see an example of using that with a Service here.

  3. Broadcast Intents. The Service broadcasts an Intent via sendBroadcast() on a data change. The Activity registers a BroadcastReceiver using registerReceiver(), and that BroadcastReceiver is notified of an incoming broadcast. This triggers the Activity to load the latest data from the Service, or possibly just to get the latest data out of extras in the broadcast Intent. You can see an example of using that technique with a Service here.

More Related Contents:

  1. Android ListView selected item stay highlighted
  2. How can I parse a local JSON file from assets folder into a ListView?
  3. Android custom Row Item for ListView
  4. Custom ListView click issue on items in Android
  5. customised listview using arrayadapter class in android
  6. notifyDataSetChanged() makes the list refresh and scroll jumps back to the top
  7. Click is not working on the Listitem Listview android
  8. Reusing views in Android Listview with 2 different layouts
  9. ListView selection remains persistent after exiting choice mode
  10. How to add Three Level ListView in ExpandableListView in android
  11. How do I clear ListView selection?
  12. Extracting only digits from a String [closed]
  13. How to delete firebase data after “n” days
  14. Can’t create handler inside thread that has not called Looper.prepare() inside AsyncTask for ProgressDialog
  15. ANDROID: How to gain root access in an Android application?
  16. Android – How to take screenshot programmatically
  17. How to draw circle by canvas in Android?
  18. JCenter deprecation; impact on Gradle and Android
  19. How can I give an imageview click effect like a button on Android?
  20. Center message in android dialog box
  21. == and .equals() not working in java [duplicate]
  22. NullPointerException on Button.findViewById()
  23. Android Days between two dates
  24. java.lang.RuntimeException: takePicture failed
  25. Google Maps API and custom polyline route between Markers
  26. Android LocationServices.FusedLocationApi deprecated
  27. how do I get file size of temp file in android?
  28. how to programatically theme an activity to be like a dialog?
  29. If-else working, switch not [duplicate]
  30. myLocationOverlay change the marker

Leave a Comment