@Override public void onClick(View v) { try { int i = Integer.parseInt(textView.getText().toString()); switch (v.getId()) { case R.id.up_button: textView.setText("" + (i + 1)); break; case R.id.down_button: textView.setText("" + (i - 1)); break; case R.id.new_activity_button: ListActivity.start(this); break; case R.id.fragment_button: FragmentActivity.start(this); break; default: } } catch (IllegalArgumentException e) { textView.setText("I Broke :("); } }