Tukukkk

I have two fragments in which1st fragment(Business) there is a object stringlist that needs to be transferred to 2nd fragment(Businessdetail).

I want to know what is the best method of practise and how should i do it?

public class Business extends Fragment {



        public List<StringList> businessNews = new ArrayList<>();

        private RecyclerView recyclerView;

        StringList stringList; //object need to transfered to other fragment 

        public Business() {

        }



        @Override

        public View onCreateView(LayoutInflater inflater, ViewGroup container,

                                 Bundle savedInstanceState) {



            View view = inflater.inflate(R.layout.fragment_business, container, false);

            recyclerView = (RecyclerView) view.findViewById(R.id.business_recycler_view);



            FetchLists f = new FetchLists();

            f.execute(10, 0);

            return view;

        }



        @Override

        public void onCreate(@Nullable Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

        }





        public class FetchLists extends AsyncTask<Integer, Void, List<StringList>> {



            @Override

            protected List<StringList> doInBackground(Integer... params) {



                int count = params[0];

                int offset = params[1];



                String urlString = "https://nei.org/v1/articlesbjkbknklnmlmerg&sortBy=top&apiKey=50e2bjkbbkba5a5f476ff528a8";

                urlString = urlString + "&count=" + count + "&offset=" + offset;



                try {

                    URL url = new URL(urlString);

                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();

                    connection.setRequestMethod("GET");

                    InputStream stream = connection.getInputStream();

                    BufferedReader reader = new BufferedReader(new InputStreamReader(stream));

                    String line = reader.readLine();

                    String response = "";

                    while (line != null) {

                        response += line;

                        line = reader.readLine();

                    }



                    JSONObject object = new JSONObject(response);

                    JSONArray emailLists = object.getJSONArray("articles");



                    for (int i = 0; i < emailLists.length(); i++) {

                        JSONObject listData = (JSONObject) emailLists.get(i);



                         stringList = new StringList();

                        stringList.authorName = listData.getString("author");

                        stringList.headline = listData.getString("title");

                        stringList.publishedTime = listData.getString("publishedAt");

                        stringList.newsDetail = listData.getString("description");



                        businessNews.add(stringList);

                        Log.d("ashu", "authorname" + stringList.authorName);

                    }



                } catch (Exception e) {

                    e.printStackTrace();

                }

                return businessNews;

            }



        public class BusinessAdapter extends RecyclerView.Adapter<BusinessHolder> {







            @Override

            public BusinessHolder onCreateViewHolder(ViewGroup parent, int viewType) {



                Context context = parent.getContext();

                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

                View view = inflater.inflate(R.layout.layout_news, parent, false);

                return new BusinessHolder(view);

            }



            @Override

            public void onBindViewHolder(BusinessHolder holder, int position) {



                StringList m = c.get(position);

                holder.bindListName(m, position);

     }}



        public class BusinessHolder extends RecyclerView.ViewHolder {



            public TextView headlineTextview;

            public TextView authorTextview;

            public TextView timeTextview;



            public BusinessHolder(View itemView) {

                super(itemView);



                headlineTextview = (TextView) itemView.findViewById(R.id.id_headline);

                authorTextview = (TextView) itemView.findViewById(R.id.id_author);

                timeTextview = (TextView) itemView.findViewById(R.id.id_time);



            }

2nd Fragment:

In this fragment i want to set the object data to the Textview Parameters

public class BusinessDetail extends Fragment {

 StringList mstringList;

    private TextView headlineSecond;

    public TextView authorSecond;

    private TextView detailsSecond;





    @Override

    public void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

    }



    @Override

    public View onCreateView(LayoutInflater inflater, ViewGroup container,

                             Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_business_detail, container, false);

        return view;

    }





    @Override

    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {

        super.onViewCreated(view, savedInstanceState);



        headlineSecond = (TextView) view.findViewById(R.id.id_headline_second);

        authorSecond = (TextView) view.findViewById(R.id.id_author_second);

        detailsSecond = (TextView) view.findViewById(R.id.id_details_second);

   }}

Fragments are not supposed to know about each other.

Instead of tranfering from one fragment to another, declare the object list in the activity and have each fragment get it from there:

To do that in main activity declare the object list and a getter for the list:

public List<StringList> businessNews = new ArrayList<>();



public List<StringList> getObjectList(){

    return objectList;

}

Then in the Fragments, you can get the list:

((MainActivity) getActivity()).getObjectList();

You could make this call in onResume() to make sure the Fragment and the Activity are ready.

For a more correct solution, this part ((MainActivity) getActivity())could be implemented using an interface so as to avoid the casting.

If BusinessDetail and Business are children of the same activity, you should provide an interface between both fragments and the activity. In your Business fragment, you could make this call (in the fragment's onAttach or after):

((MyActivity)getActivity()).showObjectOnBusiness(stringList);

In the MyActivity showObjectOnBusiness method, you should pass the object to the BusinessDetail fragment:

Bundle bundle = new Bundle();

bundle.putParcelable(BusinessDetail.OBJECT_KEY, stringList);

new BusinessDetail().setArguments(bundle);

Inside your BusinessDetail, you may obtain your object through the arguments:

Bundle bundle = getArguments();



if (bundle == null || !bundle.containsKey(OBJECT_KEY)) {

    throw new IllegalArgumentException("StringList should not be null");

}

StringList stringList = bundle.getParcelable(OBJECT_KEY);

StringList should implement Parcelable.

Saving reference to fragment in another one - bad practice. You can use this method, it works fine.

You can achieve this through following code

Bundle bundle = new Bundle();

bundle.putParcelableArrayList("Key_List", businessNews);

fragmentInstance.setArguments(bundle);

You can also use Serializable but serializable is slower than parcelable

 Bundle bundle = new Bundle();

bundles.putSerializable("Key_List", businessNews);

fragmentInstance.setArguments(bundle);

You can use
Event Bus library

It will simplify the communication between components,

works on publisher/subscriber pattern.