How to run activity in background in Android [closed]

Answer 1

It is recommended to use Services to achieve that goal, but I've encountered similar situation when in need for something from another app - and the intent for the service wasn't exported, so the only way to start the service is to start the activity - and to keep the user in my app I need to keep my activity in the foreground. In that case it's possible to start the other activity in an AsyncTask, and then in onPostExecute restart myself.

    (new AsyncTask() {
        boolean starting = false;
        @Override
        protected Void doInBackground(Void... params) {
            if(!externalServiceRunning()){
                Intent externalIntent = getPackageManager().getLaunchIntentForPackage("com.external...");
                if (externalIntent != null) {
                    starting = true;
                    startActivity(externalIntent);
                }
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            if(starting) {
                Intent myApp = getPackageManager().getLaunchIntentForPackage("com.my.myapp");
                if (myApp != null) {
                    startActivity(myApp);
                }
            }
        }
    }).execute();