java - How to update Activity from thread started in another activity? -

i have main activity , after click on button start thread (but thread hidden in library , have callback in main activity. want start activity (call a) want put results thread. below simplified code:

public class main extends activity {       xmanager.resultscallback xresultscallback = new xmanager.resultscallback() {  // method called every 10 sec.          @override         public void onresult(arraylist<string> texts) {           }     };      xmanager xmanager = new xmanager(xresultscallback);     view.onclicklistener onclick = new view.onclicklistener() {          @override         public void onclick(view arg0) {             xmanager.start();              intent = new intent(main.this, a.class);             startactivity(i);          }     };   } 

i want update content of activity each time when onresult() method called. how that?

use localbroadcastmanager,

in main activity create function :

private void sendresult() {   log.d("sender", "broadcasting message");   intent intent = new intent("custom-event-name");   // can include data.   intent.putextra("message", "this result!");   localbroadcastmanager.getinstance(this).sendbroadcast(intent); } 

and add broadcastreceiver in a activity

private broadcastreceiver onresult= new broadcastreceiver() {      @override     public void onreceive(context context, intent intent) {         log.d("jazzy","onreceive called");      } }; 

add on oncreate

@override public void oncreate(bundle savedinstancestate) {    // register receive messages.   localbroadcastmanager.getinstance(this).registerreceiver(mmessagereceiver,       new intentfilter("custom-event-name")); } 

add ondestroy

@override protected void ondestroy() {   localbroadcastmanager.getinstance(this).unregisterreceiver(mmessagereceiver);   super.ondestroy(); }