fragment not work and have errors

Question

have app get image and text from server then show that in card view and have another app with different tabs and which tab extend from Fragment

so want put my first app in which one of second app tabs . like this :

so paste my main activity code from first app in fragment but have errors :

public class news extends Fragment {

    private RecyclerView recyclerView;
    private ArrayList<Deatails> data;
    private DataAdapter adapter;


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

    myFragmentView= inflater.inflate(R.layout.news, container, false);
      initViews();
    return myFragmentView;
}

    private void initViews() {

        recyclerView = (RecyclerView)myFragmentView.findViewById(R.id.card_recycler_view);
        recyclerView.setHasFixedSize(true);
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
        recyclerView.setLayoutManager(layoutManager);
        loadJSON();
    }

    private void loadJSON() {

            Retrofit retrofit = new Retrofit.Builder()
                    .baseUrl("http://memaraneha.ir/")
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
            RequestInterface request = retrofit.create(RequestInterface.class);
            Call<JSONResponse> call = request.getJSON();

            final ProgressDialog progressDialog = new ProgressDialog(this);
            progressDialog.show();

            call.enqueue(new Callback<JSONResponse>() {
                @Override
                public void onResponse(Call<JSONResponse> call, Response<JSONResponse> response) {
                    progressDialog.dismiss();

                    JSONResponse jsonResponse = response.body();
                    data = new ArrayList<>(Arrays.asList(jsonResponse.getAndroid()));
                    adapter = new DataAdapter(MainActivity.this, data);
                    recyclerView.setAdapter(adapter);
                }

                @Override
                public void onFailure(Call<JSONResponse> call, Throwable t) {
                    progressDialog.dismiss();
                    Log.d("Error", t.getMessage());
                }
            });
    }
}

this is my errors :

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Answer 1

i solve my problems so its correct code for people :

public class news extends Fragment {

    private RecyclerView recyclerView;
    private ArrayList<Deatails> data;
    private DataAdapter adapter;
    private View myFragmentView;



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


        myFragmentView= inflater.inflate(R.layout.news, container, false);
        initViews();
        return myFragmentView;
    }

    private void initViews() {

        recyclerView = (RecyclerView)myFragmentView.findViewById(R.id.card_recycler_view);
        recyclerView.setHasFixedSize(true);
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity().getApplicationContext());
        recyclerView.setLayoutManager(layoutManager);
        loadJSON();
    }

    private void loadJSON() {

            Retrofit retrofit = new Retrofit.Builder()
                    .baseUrl("http://memaraneha.ir/")
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
            RequestInterface request = retrofit.create(RequestInterface.class);
            Call<JSONResponse> call = request.getJSON();

            final ProgressDialog progressDialog = new ProgressDialog(getActivity());
            progressDialog.show();

            call.enqueue(new Callback<JSONResponse>() {
                @Override
                public void onResponse(Call<JSONResponse> call, Response<JSONResponse> response) {
                    progressDialog.dismiss();

                    JSONResponse jsonResponse = response.body();
                    data = new ArrayList<>(Arrays.asList(jsonResponse.getAndroid()));
                    adapter = new DataAdapter(getActivity(), data);
                    recyclerView.setAdapter(adapter);
                }

                @Override
                public void onFailure(Call<JSONResponse> call, Throwable t) {
                    progressDialog.dismiss();
                    Log.d("Error", t.getMessage());
                }
            });
    }
}

Answer 2

You should use link to View inside your Fragment.

Inside Fragment

private View myFragmentView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    myFragmentView = inflater.inflate(R.layout.news, container, false);
    return myFragmentView;
}

You cannot just copy paste code from your activity to your fragment. You need to launch findViewById from your fragment view.

myFragmentView.findViewById(R.id.addYourViewHere);

You cannot run init methods before OnCreateView method of your fragment.

Answer 3

When you are using fragment, u have to override it's onCreateView method.

Example:

public class FavFragment extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_favorite, container, false);

    mRecyclerView = (RecyclerView) v.findViewById(R.id.my_recycler_view);
    layoutEmpty = (RelativeLayout) v.findViewById(R.id.layoutEmpty);
    btnShowOnMap = (FloatingActionButton) v.findViewById(R.id.btnShowOnMap);
    fabRoulette = (FloatingActionButton) v.findViewById(R.id.fabRoulette);
    mainView = v.findViewById(R.id.mainView);


    return v;
}