how to deal activity value interaction

down vote

If you want to pass data from the preference activity to your main activity use this code: In your main activity class (launch): startActivityForResult(new Intent(main.this, preferences.class), 0); In your preference activity class (set the result): Intent i; i.putStringExtra("name", "tom"); setResult(RESULT_OK, i); finish(); In your main activity class (get the result): @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == 0) { if (resultCode == RESULT_OK){ Log.d("test", data.getExtraString("name"); } } } You can put as many extras as you want and not only strings but all standard data types.

Intent intent = new Intent(getApplicationContext(), com.jivepia.jiverun.AS_JiveRun_20170702_diary.history.HistoryDetailOfListForWorkout.class);
intent.putExtra("_id", workoutList.get(position)._id);
startActivityForResult(intent,REQUEST_CODE);