refresh activity after receiving the response from the background service

Question

I am working on an application where i use a background service to send a request to a server the response is then stored in a database and display the data dynamically as receiving the answers from the background service and saving them in the database, knowing that i'm using a

ListView

to display the data from the database. how can i refresh the activity every time i save new data in the database? i have triyed displaying the data after a click it's working how can i do it dynamically?

Answer 1

Assuming you are using a true service or not an AsyncTask.

Use a BroadcastReceiver pattern. Send the broadcast in your service.

LocalBroadcastManager.getInstance(context).sendBroadcast(new Intent("data_changed"));

Declare your receiver in activity containing your listview

  private BroadcastReceiver dataChangeReceiver= new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        // update your listview
    }
};

Register and unregister it

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    IntentFilter inF = new IntentFilter("data_changed");
    LocalBroadcastManager.getInstance(this).registerReceiver(dataChangeReceiver,inF);



}
 @Override
protected void onPause() {
    super.onPause();
    LocalBroadcastManager.getInstance(this).unregisterReceiver(dataChangeReceiver);
}