Change
dateTime.setText(app.getTotalDl());
To
dateTime.setText(String.valueOf(app.getTotalDl()));
There are different versions of setText – one takes a String and one takes an int resource id. If you pass it an integer it will try to look for the corresponding string resource id – which it can’t find, which is your error.
I guess app.getTotalDl() returns an int. You need to specifically tell setText to set it to the String value of this int.