Nullpointerexception thrown when trying to findViewById

Question

I have the following Activity:

public class MainActivity extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    supe         


        

Answer 1

Write code to initialize button from fragment becuase your button is into fragment layout not into activity's layout.

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_main, container,
            false);
    Button login = (Button) rootView.findViewById(R.id.loginButton);
    login.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {

            Intent intent = new Intent(MainActivity.this,
                    LoginActivity.class);
            startActivity(intent);
        }
    });

    return rootView;
}

And remove the login button related code from onCreate of Activity.