fragment setArguments

public class FramentTest2Activity extends ActionBarActivity {
       
        @Override
        protected void onCreate(Bundle savedInstanceState) {
              super.onCreate(savedInstanceState);
             setContentView(R.layout. activity_main);
 
              if (savedInstanceState == null) {
                    getSupportFragmentManager().beginTransaction()
                                 .add(R.id. container, TestFragment.newInstance("param")).commit();
             }
 
       }
 
        public static class TestFragment extends Fragment {
 
              private static final String ARG = "arg";
             
              public TestFragment() {
                    Log. i("INFO", "TestFragment non-parameter constructor" );
             }
 
              public static Fragment newInstance(String arg){
                    TestFragment fragment = new TestFragment();
                    Bundle bundle = new Bundle();
                    bundle.putString( ARG, arg);
                    fragment.setArguments(bundle);
                     return fragment;
             }
             
              @Override
              public View onCreateView(LayoutInflater inflater, ViewGroup container,
                           Bundle savedInstanceState) {
                    View rootView = inflater.inflate(R.layout. fragment_main, container,
                                  false);
                    TextView tv = (TextView) rootView.findViewById(R.id. tv);
                    tv.setText(getArguments().getString( ARG));
                     return rootView;
             }
       }
 
}