How to load json data in fragment in Android

Question

I want show 3 fragments in my Activity and load data from json in any fragments! I want show each json data into one fragment, but in my application show all of data in all fragments!
For example : i want show article data into article fragment, music data into music fragment and more ... . but now show all data (article, music, video) in all fragments!
In my application i use EventBus for send data and use one DataModel for save json data into this.

Fragment 1 :

public class free_fragment extends Fragment {

    private RecyclerView mRecyclerView;
    private free_recycler_adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;
    private List<DataModel> dataModels = new ArrayList<DataModel>();

    private Context context;

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

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

        context = getContext();

        if (!EventBus.getDefault().isRegistered(this)) {
            EventBus.getDefault().register(this);
        }

        LoadData();

        ///----- RecyclerView -----
        mRecyclerView = (RecyclerView) view.findViewById(R.id.pdf_RecyclerView);
        mRecyclerView.setHasFixedSize(true);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        mAdapter = new free_recycler_adapter(context, dataModels);
        mRecyclerView.setAdapter(mAdapter);

        return view;
    }

    @Subscribe
    public void onEvent(List<DataModel> mainInfoModels) {
/*        if (dataModels.size() > 0) {
            dataModels.remove(dataModels.size() - 1);
            mAdapter.notifyItemRemoved(dataModels.size());
            //mAdapter.setLoaded();
        }*/

        mAdapter.add(mainInfoModels);
        mAdapter.notifyDataSetChanged();
    }

    private void LoadData() {
        freeDataInfo dataInfo = new freeDataInfo();
        // here getMainDataInfo() should return the server response
        dataInfo.getFreeDataInfo(context);
    }

Fragment 2 :

public class paid_fragment extends Fragment {

    private RecyclerView mRecyclerView;
    private paid_recycler_adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;
    private List<DataModel> dataModels = new ArrayList<DataModel>();

    private Context context;

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

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

        context = getContext();

        if (!EventBus.getDefault().isRegistered(this)) {
            EventBus.getDefault().register(this);
        }

        LoadData();

        ///----- RecyclerView -----
        mRecyclerView = (RecyclerView) view.findViewById(R.id.voice_RecyclerView);
        mRecyclerView.setHasFixedSize(true);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        mAdapter = new paid_recycler_adapter(context, dataModels);
        mRecyclerView.setAdapter(mAdapter);

        return view;
    }

    @Subscribe
    public void onEvent(List<DataModel> mainInfoModels) {
/*        if (dataModels.size() > 0) {
            dataModels.remove(dataModels.size() - 1);
            mAdapter.notifyItemRemoved(dataModels.size());
            //mAdapter.setLoaded();
        }*/

        mAdapter.add(mainInfoModels);
        mAdapter.notifyDataSetChanged();
    }

    private void LoadData() {
        paidDataInfo dataInfo = new paidDataInfo();
        // here getMainDataInfo() should return the server response
        dataInfo.getPaidDataInfo(context);
    }

AsyncTask codes for Fragment 1 :

public class freeDataInfo {
    private Context mContext ;
    private String ServerAddress = freeServer_IP.getFreeIP();

    public void getFreeDataInfo(Context context) {
        mContext = context;
        new getInfo().execute(ServerAddress + "limit=10");
    }

    private class getInfo extends AsyncTask<String, Void, String> {
        EventBus bus = EventBus.getDefault();
        private String ou_response;
        private List<DataModel> infoModels;

        @Override
        protected void onPreExecute() {
            CustomProcessDialog.createAndShow(mContext);
            infoModels = new ArrayList<>();
        }

        @Override
        protected String doInBackground(String... params) {
            OkHttpClient client = new OkHttpClient();

            //String url = (String) params[0];
            Request request = new Request.Builder()
                    .url(ServerAddress + "limit=10")
                    .cacheControl(CacheControl.FORCE_NETWORK)
                    .build();

            Response response;
            try {
                response = client.newCall(request).execute();
                ou_response = response.body().string();
                response.body().close();
                if (ou_response != null) {
                    try {
                        JSONObject postObj = new JSONObject(ou_response);
                        JSONArray postsArray = postObj.optJSONArray("result");
                        infoModels = new ArrayList<>();

                        for (int i = 0; i <= infoModels.size(); i++) {
                            JSONObject postObject = (JSONObject) postsArray.get(i);

                            int id = postObject.getInt("id");
                            Log.d("id", String.valueOf(id));
                            String title = postObject.getString("title");
                            String description = postObject.getString("description");
                            String image = postObject.getString("image");
                            String category = postObject.getString("categoryName");
                            String date = postObject.getString("publishDate");

                            Log.d("Data", "Post ID: " + id);
                            Log.d("Data", "Post title: " + title);
                            Log.d("Data", "Post image: " + image);
                            Log.d("Data", "---------------------------------");

                            //Use the title and id as per your requirement
                            infoModels.add(new DataModel(id, title, description, category, date, image));
                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                        Log.e("error", String.valueOf(e));
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
                Log.e("error2", String.valueOf(e));
            }
            return ou_response;
        }

        @Override
        protected void onPostExecute(String result) {
            CustomProcessDialog.dissmis();
            if (result != null) {
                bus.post(infoModels);
            } else {
                Toast.makeText(mContext, "Empty", Toast.LENGTH_SHORT).show();
            }
        }
    }
}

AsyncTask codes for Fragment 2 :

public class paidDataInfo {
    private Context mContext;
    private String ServerAddress = paidServer_IP.getPaidIP();

    public void getPaidDataInfo(Context context) {
        mContext = context;
        new getInfo().execute(ServerAddress + "limit=10");
    }

    private class getInfo extends AsyncTask<String, Void, String> {
        EventBus bus = EventBus.getDefault();
        private String ou_response;
        private List<DataModel> infoModels;

        @Override
        protected void onPreExecute() {
            CustomProcessDialog.createAndShow(mContext);
            infoModels = new ArrayList<>();
        }

        @Override
        protected String doInBackground(String... params) {
            OkHttpClient client = new OkHttpClient();

            //String url = (String) params[0];
            Request request = new Request.Builder()
                    .url(ServerAddress + "limit=10")
                    .cacheControl(CacheControl.FORCE_NETWORK)
                    .build();

            Response response;
            try {
                response = client.newCall(request).execute();
                ou_response = response.body().string();
                response.body().close();
                if (ou_response != null) {
                    try {
                        JSONObject postObj = new JSONObject(ou_response);
                        JSONArray postsArray = postObj.optJSONArray("result");
                        infoModels = new ArrayList<>();

                        for (int i = 0; i <= infoModels.size(); i++) {
                            JSONObject postObject = (JSONObject) postsArray.get(i);

                            int id = postObject.getInt("id");
                            Log.d("id", String.valueOf(id));
                            String title = postObject.getString("title");
                            String description = postObject.getString("description");
                            String image = postObject.getString("image");
                            String category = postObject.getString("categoryName");
                            String date = postObject.getString("publishDate");

                            Log.d("Data", "Post ID: " + id);
                            Log.d("Data", "Post title: " + title);
                            Log.d("Data", "Post image: " + image);
                            Log.d("Data", "---------------------------------");

                            //Use the title and id as per your requirement
                            infoModels.add(new DataModel(id, title, description, category, date, image));
                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                        Log.e("error", String.valueOf(e));
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
                Log.e("error2", String.valueOf(e));
            }
            return ou_response;
        }

        @Override
        protected void onPostExecute(String result) {
            CustomProcessDialog.dissmis();
            if (result != null) {
                bus.post(infoModels);
            } else {
                Toast.makeText(mContext, "Empty", Toast.LENGTH_SHORT).show();
            }
        }
    }
}

How can i fix this problem ?

Naveen Tamrakar · Accepted Answer · 2016-06-06 10:50:05Z

for (int i = 0; i <= infoModels.size(); i++)

Replace with

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

Also Asign ArrayList infoModels One Time

private List<DataModel> infoModels = new ArrayList<>();

public class freeDataInfo {
    private Context mContext ;
    private String ServerAddress = freeServer_IP.getFreeIP();

    public void getFreeDataInfo(Context context) {
        mContext = context;
        new getInfo().execute(ServerAddress + "limit=10");
    }

    private class getInfo extends AsyncTask<String, Void, String> {
        EventBus bus = EventBus.getDefault();
        private String ou_response;
        private List<DataModel> infoModels = new ArrayList<>();

        @Override
        protected void onPreExecute() {
            CustomProcessDialog.createAndShow(mContext);
        }

        @Override
        protected String doInBackground(String... params) {
            OkHttpClient client = new OkHttpClient();

            //String url = (String) params[0];
            Request request = new Request.Builder()
                    .url(ServerAddress + "limit=10")
                    .cacheControl(CacheControl.FORCE_NETWORK)
                    .build();

            Response response;
            try {
                response = client.newCall(request).execute();
                ou_response = response.body().string();
                response.body().close();
                if (ou_response != null) {
                    try {
                        JSONObject postObj = new JSONObject(ou_response);
                        JSONArray postsArray = postObj.optJSONArray("result");

                        for (int i = 0; i <= postsArray.length(); i++) {
                            JSONObject postObject = (JSONObject) postsArray.get(i);

                            int id = postObject.getInt("id");
                            Log.d("id", String.valueOf(id));
                            String title = postObject.getString("title");
                            String description = postObject.getString("description");
                            String image = postObject.getString("image");
                            String category = postObject.getString("categoryName");
                            String date = postObject.getString("publishDate");

                            Log.d("Data", "Post ID: " + id);
                            Log.d("Data", "Post title: " + title);
                            Log.d("Data", "Post image: " + image);
                            Log.d("Data", "---------------------------------");

                            //Use the title and id as per your requirement
                            infoModels.add(new DataModel(id, title, description, category, date, image));
                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                        Log.e("error", String.valueOf(e));
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
                Log.e("error2", String.valueOf(e));
            }
            return ou_response;
        }

        @Override
        protected void onPostExecute(String result) {
            CustomProcessDialog.dissmis();
            if (result != null) {
                bus.post(infoModels);
            } else {
                Toast.makeText(mContext, "Empty", Toast.LENGTH_SHORT).show();
            }
        }
    }
}

i edit my codes with your codes, but not work me . show again all datas in all fragments!

Yasin Kaçmaz · Accepted Answer · 2016-06-06 12:02:40Z

1

You always posting same event for each fragment , then you get all items in all fragments . You need a class when posting EventBus :

public class MyEvent {
private String fragmentTag ;
private ArrayList<DataModel> infoModels ;

public MyEvent (String tag,ArrayList<DataModel> models){
    this.fragmentTag = tag;
    this.infoModels = models;
}

}

Then posting like :

bus.post(new MyEvent ("forfragment1",infoModels) );

Then in your Fragment1 :

@Subscribe
public void onEvent(MyEvent event) {
    if(event.fragmentTag.equals("forfragment1"))
    {
       //populate your view , do something
    }
}

private void LoadData() {
    freeDataInfo dataInfo = new freeDataInfo();
    // here getMainDataInfo() should return the server response
    dataInfo.getFreeDataInfo(context);
}

answered Jun 6, 2016 at 12:02

Yasin Kaçmaz

6,6535 gold badges42 silver badges59 bronze badges

1 Comment

Mohammad Nouri Over a year ago

Thanks @Yasin, can you send me your email for connect? please

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