Adrià Illa Adrià Illa - 3 months ago 5
Android Question

Why isn't BlankFragment not working?

I'm trying to create an app that displays a fragment whenever you click an option in a navigation drawer. However, when creating a BlankFragment (by using

BlankFragment fragment = new BlankFragment();
, I get an error:
BlankFragment
turns into red and Android Studio doesn't recognize it.

MainActivity.java

...

} else if (id == R.id.nav_shooks) {

FragmentManager fragmentManager = getFragmentManager();

FragmentTransaction transaction = fragmentManager.beginTransaction();

BlankFragment fragment = new BlankFragment();
transaction.add(R.id.shooksLayout, fragment);

transaction.commit();

} else if (id == R.id.nav_prizes) {

...


ShooksFragment

package com.shook.android.shook;

import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;


/**
* A simple {@link Fragment} subclass.
* Activities that contain this fragment must implement the
* {@link ShooksFragment.OnFragmentInteractionListener} interface
* to handle interaction events.
*/
public class ShooksFragment extends Fragment {

private OnFragmentInteractionListener mListener;

public ShooksFragment() {
// Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_shooks, container, false);
}

// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}

@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}

@Override
public void onDetach() {
super.onDetach();
mListener = null;
}

/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}


Here is the error. As you can see, the word BlankFragment is in red

Answer

You're missing the newInstance() method in the ShooksFragment,

Add this method and please report back.

// TODO: Rename and change types and number of parameters
public static ShooksFragment newInstance() {

    ShooksFragment fragment = new ShooksFragment();

    return fragment;
}