Android: Passing variables to an already running service

Question

I am having issues passing a value from an Activity to an already running service. I was wondering what the best approach to take would be? Adding extras wont work as I believe

Answer 1

pass intent extra to service from activity start this intent if service is running try this from activity and pass param with putExtra.

Intent rc = new Intent(getApplicationContext(), myService.class);
rc.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); //important for Android 10
rc.putExtra("parama","ciao");
rc.putExtra("paramb","hello");
startService(rc);

Remember, new thread, exit to main Thread.

new Thread(){
    @Override
        public void run() {
            super.run();
            //start service..
        }    
}

your service

 public class myService extends Service {
               @Override
                public int onStartCommand(Intent intent, int flags, int startId) {
                if (intent.hasExtra("parama")){            
                Bundle b=new Bundle();
                b=intent.getExtras();
                String par_a=b.getString("parama");
                }
                if (intent.hasExtra("paramb")){            
                Bundle b=new Bundle();
                b=intent.getExtras();
                String par_b =b.getString("paramb");
                }
        }
    }