Hay fragmentos anidados conTabLayout yViewPager. Cada fragmento tiene una vista de lista en su interior para que puedan llamar juntos y ahora tengo un problema de procesamiento lento de la aplicación. He intentado algunas soluciones como la biblioteca volley pero no funcionó para mí. Para obtener más información, también estoy publicando mi código, así que por favor guíame para que sea mejor.

MainTabFragment.java

public class MainTabFragment extends Fragment {

public static int position_child_tab = 0, three_childs_tab_position = 0;
static int count = -1;
int position_tab = 0;
Bundle args;
MyTabLayout myTabLayout;

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

/**
 * Use this factory method to create a new instance of
 * this fragment using the provided parameters.
 *
 * @param param1 Parameter 1.
 * @param param2 Parameter 2.
 * @return A new instance of fragment MainTabFragment.
 */
// TODO: Rename and change types and number of parameters
public static MainTabFragment newInstance(String param1, String param2) {

    return new MainTabFragment();
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.main_tab_fragment, container, false);
    myTabLayout = (MyTabLayout) view.findViewById(R.id.mainTabLayout);
    NonSiwpablePager pager = (NonSiwpablePager) view.findViewById(R.id.pager);
    args = getArguments();
    if (args != null && args.containsKey("pos_next"))
        position_tab = args.getInt("pos_next");
    if (args != null && args.containsKey("pos_end"))
        position_child_tab = args.getInt("pos_end");
    if (position_child_tab != 3) {
        three_childs_tab_position = position_child_tab;
    } else {
        three_childs_tab_position = 0;
    }
    args = new Bundle();
    args.putInt("pos_end", position_child_tab);
    ViewPagerAdapter mAdapter = getViewPagerAdapter();
    pager.setAdapter(mAdapter);
    pager.setOffscreenPageLimit(4);
    myTabLayout.setupWithViewPager(pager);
    for (int i = 0; i < mAdapter.getCount(); i++) {
        View customView = mAdapter.getCustomeView(getActivity(), i);
        myTabLayout.getTabAt(i).setCustomView(customView);
    }
    pager.setCurrentItem(position_tab);
    return view;
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    myTabLayout.getTabAt(position_tab).getCustomView().setSelected(true);
}

private ViewPagerAdapter getViewPagerAdapter() {
    ViewPagerAdapter mAdapter = new ViewPagerAdapter(getChildFragmentManager());
    String title_arr[] = {"ADVISORY", "TOP ADVISORS", "EXPERT VIEW"};
    for (int i = 0; i < title_arr.length; i++) {
        Map<String, Object> map = new Hashtable<>();
        map.put(ViewPagerAdapter.KEY_TITLE, title_arr[i]);
        if (i == 0) {
            map.put(ViewPagerAdapter.KEY_FRAGMENT, AdvisoryPagerFragment.newInstance());
        } else if (i == 1) {
            map.put(ViewPagerAdapter.KEY_FRAGMENT, TopAdvisoryPagerFragment.newInstance());
        } else if (i == 2) {
            map.put(ViewPagerAdapter.KEY_FRAGMENT, ExperViewPagerFragment.newInstance());
        }
        mAdapter.addFragmentAndTitle(map);

    }
    return mAdapter;
}

public static class ViewPagerAdapter extends FragmentStatePagerAdapter {
    private static final String KEY_TITLE = "fragment_title";
    private static final String KEY_FRAGMENT = "fragment";
    boolean abc = false;
    private int[] drawables = new int[]{R.drawable.advisory_selector, R.drawable.top_advisors_selector, R.drawable.expertview_selector};
    private List<Map<String, Object>> maps = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    public View getCustomeView(Context context, int pos) {
        View mView = LayoutInflater.from(context).inflate(R.layout.custom_tab_view, null);
        TextView mTextView = (TextView) mView.findViewById(R.id.textView);
        mTextView.setTypeface(Typeface.createFromAsset(context.getAssets(), "fonts/ufonts.com_cambria.ttf"));
        ImageView mImageView = (ImageView) mView.findViewById(R.id.imageView2);
        mImageView.setTag(pos);

        /*if(count >0)
        {
            Toast.makeText(context,"Count Is "+count,Toast.LENGTH_SHORT).show();
            mImageView =  (ImageView) mImageView.getTag(0);
            mImageView.setSelected(false);
        }
        */
        mImageView.setImageResource(drawables[pos]);
        mTextView.setText(getPageTitle(pos));
        return mView;
    }

    public void addFragmentAndTitle(Map<String, Object> map) {
        maps.add(map);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return (CharSequence) maps.get(position).get(KEY_TITLE);
    }

    @Override
    public Fragment getItem(int position) {

        return (Fragment) maps.get(position).get(KEY_FRAGMENT);
    }

    @Override
    public int getCount() {
        return maps.size();
    }
}


}

Fragmento Infantil deMainTabFragment es como :

AdvisoryPagerFragment.java

public class AdvisoryPagerFragment extends Fragment {
static String advisory_child_fragments[];
int myID = 0;
Bundle bundle;
TabLayout mTabLayout;

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

/**
 * Use this factory method to create a new instance of
 * this fragment using the provided parameters.
 *
 * @return A new instance of fragment AdvisoryPagerFragment.
 */

public static AdvisoryPagerFragment newInstance() {
    return new AdvisoryPagerFragment();
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View inflate = inflater.inflate(R.layout.fragment_app_pager, container, false);
    /*Bundle args = getArguments();
    if (args  != null && args.containsKey("pos_end"))
         myID = args.getInt("pos_end");*/
    myID = MainTabFragment.position_child_tab;
    mTabLayout = (TabLayout) inflate.findViewById(R.id.fragmentTabLayout);
    advisory_child_fragments = new String[]{"EQUITY", "INDICES", "COMMODITY", "CURRENCY"};
    ViewPager pager = (ViewPager) inflate.findViewById(R.id.fragment_pager);
    FragmentViewPagerAdapter mPagerAdapter = new FragmentViewPagerAdapter(getChildFragmentManager());
    pager.setAdapter(mPagerAdapter);
    mTabLayout.setupWithViewPager(pager);
    for (int i = 0; i < mPagerAdapter.getCount(); i++) {
        View customView = mPagerAdapter.getCustomeView(getActivity(), i);
        mTabLayout.getTabAt(i).setCustomView(customView);
    }
    pager.setCurrentItem(myID);
    return inflate;
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    mTabLayout.getTabAt(myID).getCustomView().setSelected(true);
}

public static class FragmentViewPagerAdapter extends FragmentStatePagerAdapter {
    public FragmentViewPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    public View getCustomeView(Context context, int pos) {
        View mView = LayoutInflater.from(context).inflate(R.layout.custom_view, null);
        TextView mTextView = (TextView) mView.findViewById(R.id.belowTab_textview);
        mTextView.setTypeface(Typeface.createFromAsset(context.getAssets(), "fonts/ufonts.com_cambria.ttf"));
        mTextView.setText(getPageTitle(pos));
        return mView;
    }

    //
    @Override
    public CharSequence getPageTitle(int position) {
        return advisory_child_fragments[position];
    }

    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                return new EquityFragment();
            case 1:
                return new IndicesFragment();
            case 2:
                return new CommodityFragment();
            case 3:
                return new CurrencyFragment();
        }
        return null;
    }

    @Override
    public int getCount() {
        return 4;
    }
 }
 }

Y el fragmento infantil de arribaAdvisoryPagerFragment es

EquityFragment.java

public class EquityFragment extends android.support.v4.app.Fragment implements SearchView.OnQueryTextListener {
public static String imagepath = null;
static ArrayList<EquityDetails> catListDao = new ArrayList<EquityDetails>();
static ArrayList<EquityDetails> catListDao1 = new ArrayList<EquityDetails>();
static int count = 0;
static int count1 = 0;
ListView list;
View view;
Activity act;
AdvisorsAdapter adapter;
TextView empty_text;
private boolean isViewShown = false;
ProgressBar progressBar;

public static EquityFragment newInstance() {
    return new EquityFragment();
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    view = inflater.inflate(R.layout.equity_activity, container, false);
    act = this.getActivity();
    Log.d("Callled ", "" + count);
    count++;
    return view;
}

public void onActivityCreated(Bundle savedInstanceState1) {
    super.onActivityCreated(savedInstanceState1);
    if (android.os.Build.VERSION.SDK_INT > 9) {
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);
    }
    list = (ListView) view.findViewById(R.id.list_equity);
    setHasOptionsMenu(true);
    empty_text = (TextView) view.findViewById(R.id.empty);
    progressBar = (ProgressBar) view.findViewById(R.id.progressBar);
    if (Utils.isNetworkAvailable(getActivity())) {
        if (catListDao.size() > 0) {
            adapter = new AdvisorsAdapter(act, R.layout.custom_equity, catListDao, 5);
            list.setAdapter(adapter);
        } else {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    // do some work here
                    getActivity().runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            //   if (!isViewShown) {
                            new FetchAllData(getActivity(), 5).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                            //    }
                        }
                    });
                }
            }).start();
        }
    } else {
        CustomToast toast = new CustomToast(getActivity(), "There is no internet connection!");
    }
 }

FetchdataClass que obtiene los datos del servicio y los agrega aListView

public class FetchAllData extends AsyncTask<Void, Void, String> {
    ProgressDialog pDialog;
    int typeId;
    private Context cont;

    public FetchAllData(Context con, int typeId) {
        // TODO Auto-generated constructor stub
        this.cont = con;
        this.typeId = typeId;
        Log.d("Constructor Called", "yes");
    }

    @Override
    protected void onPreExecute() {
        // TODO Auto-generated method stub
        super.onPreExecute();

        progressBar.setVisibility(View.VISIBLE);
    }


    @Override
    protected String doInBackground(Void... params) {
        // TODO Auto-generated method stub
        return getString();
    }

    private String getString() {
        // TODO Auto-generated method stub


        URL obj = null;
        HttpURLConnection con = null;
        try {
            obj = new URL(Constants.AppBaseUrl + "/call_listing/" + typeId);
            String userPassword = "oi" + ":" + "kl";
            String header = "Basic " + new String(android.util.Base64.encode(userPassword.getBytes(), android.util.Base64.NO_WRAP));
            con = (HttpURLConnection) obj.openConnection();
            con.addRequestProperty("Authorization", header);
            con.setRequestProperty("Content-type", "application/x-www-form-urlencoded");
            con.setRequestMethod("POST");


            // For POST only - BEGIN
            con.setDoOutput(true);
            OutputStream os = con.getOutputStream();

            os.flush();
            os.close();
            // For POST only - END

            int responseCode = con.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) { //success
                BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
                String inputLine;
                StringBuffer response = new StringBuffer();

                while ((inputLine = in.readLine()) != null) {
                    response.append(inputLine);
                }
                in.close();
                Log.i("TAG", response.toString());
                return response.toString();


            } else {
                Log.i("TAG", "POST request did not work.");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }


    @Override
    protected void onPostExecute(String result) {
        // TODO Auto-generated method stub
        super.onPostExecute(result);


        if (result != null) {
            //    pDialog.dismiss();
            progressBar.setVisibility(View.GONE);
            JSONObject jsonObject;
            try {
                catListDao = new ArrayList<EquityDetails>();
                jsonObject = new JSONObject(result);
                JSONArray jsonArray = jsonObject.getJSONArray("list");

                Log.d("Length ", "" + jsonArray.length());
                for (int i = 0; i < jsonArray.length(); i++) {
                    EquityDetails allDirectory = new EquityDetails();
                    allDirectory.setEntry_value(jsonArray.getJSONObject(i).getString("entry"));
                    allDirectory.setSerial_value(jsonArray.getJSONObject(i).getString("sl"));
                    allDirectory.setTg_value1(jsonArray.getJSONObject(i).getString("tgt_1"));
                    allDirectory.setTg_value2(jsonArray.getJSONObject(i).getString("tgt_2"));
                    allDirectory.setMainTitle_value(jsonArray.getJSONObject(i).getString("script"));
                    allDirectory.setMain_subTitle_value(jsonArray.getJSONObject(i).getString("exchange"));
                    allDirectory.setRating_value(jsonArray.getJSONObject(i).getString("rating"));
                    allDirectory.setReview_value(jsonArray.getJSONObject(i).getString("review"));
                    allDirectory.setImage1(jsonArray.getJSONObject(i).getString("advisor_image"));
                    allDirectory.setPosted_by(jsonArray.getJSONObject(i).getString("posted_by"));
                    allDirectory.setImage2(jsonArray.getJSONObject(i).getString("script_image"));
                    allDirectory.setCall_id(jsonArray.getJSONObject(i).getString("call_id"));
                    allDirectory.setBuy(jsonArray.getJSONObject(i).getString("buy_sentiment"));
                    allDirectory.setSell(jsonArray.getJSONObject(i).getString("sell_sentiment"));
                    allDirectory.setRecommend(jsonArray.getJSONObject(i).getString("recommendation"));
                    allDirectory.setPosted_date(jsonArray.getJSONObject(i).getString("posted_date"));
                    allDirectory.setExpiry_date(jsonArray.getJSONObject(i).getString("expiry_date"));
                    catListDao.add(allDirectory);
                }
                catListDao1 = catListDao;
                ab = true;
                adapter = new AdvisorsAdapter(act, R.layout.custom_equity, catListDao, 0);
                list.setAdapter(adapter);
            } catch (JSONException e) {
                e.printStackTrace();
            }

        }
        //pDialog.dismiss();
        progressBar.setVisibility(View.GONE);

    }


}