Question

I have an activity for display new sms and SmsReceiver (extends BroadcastReceiver) to receive incoming sms. After receive sms, what is the best practice to update the UI?

Answer 1

Well if you have your own activity it is obious that you want you activity to be shown after the user receive a sms. Then in your receiver , onReceive method you can do this

startActivity(new Intent(context,MyActivity.class));

and the activity is presented to the user…

If you want to put additional info you can use putExtra(“key”,”value”) (it is method from the intent)
you can use like

Intent i=new Intent():
i.putExtra("key","value");

startActivity(context,i);

then in the activity onCreate method you can get this info by

String value = intent.getStringExtra("key");

and like this you can implement your business logic

Edit

when the activity is already running you can use

android:launchMode=[“multiple” | “singleTop” |
“singleTask” | “singleInstance”]

I think singleInstance and singleTask will keep only one instance of your activity