Update activity from service

To update activity from another activity, we use startActivityForResult, for service we use this.

Pretend that we need to receive a String pass back from service and set to textView t.

Declare to top of class.

BroadcastReceiver receiver;

TextView t;

Copy to below setContentView();

IntentFilter filter = new IntentFilter();

filter.addAction("com.example.vidu");

receiver = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

//UI update here

String b = intent.getStringExtra(service.pass);

t.setText(b);

}

};

registerReceiver(receiver,filter);

In service, declare on top.

static String pass="";

Copy in to onCreate().

String back= "This is example text!";

Intent local = new Intent();

   local.setAction("com.example.vidu");

     local.putExtra(pass, back);

     sendBroadcast(local);

Declare service in file Manifest.xml.

  <service

            android:name=".myservice"

            android:enabled="true"

            android:exported="false" />

And destroy when exit class.

@Override

     protected void onDestroy() {

super.onDestroy();

unregisterReceiver(receiver);      

}