java.lang.NullPointerException:attempt to invoke virtual 'void android.widget.TextView.setTest' on a null object refrence in android 2.1.3

I think that you must initialize your TextView.

If you are in activity, put below code in the onCreate method.

TextView myTextView = findViewById(R.id.your_text_view_id);

Or if you are in Fragment, then in onCreateView insert this line:

TextView myTextView = view.findViewById(R.id.text_view_id);