片段中的回收站视图insde选项卡布局甚至不显示

Question

你好，我想在选项卡布局内的回收站视图中显示附近的医院，但是回收站视图甚至都没有显示，并且在调试控件时甚至都没有进入Volly的onResponse（）进行JSON解析...请帮助我

URL =“ https://maps.googleapis.com/maps/api/place/search/json?location=18.5668801,73.8290394&radius=3000&sensor=true&type=hospital&key=AIzaSyBLEPBRfw7sMb73Mr88L91Jqh3tuE4mKsE”

item.xml 

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="8dp"
    app:cardCornerRadius="8dp">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="16dp">

        <!--<ImageView-->
            <!--android:id="@+id/image_view"-->
            <!--android:layout_width="match_parent"-->
            <!--android:layout_height="200dp"-->
            <!--android:src="@mipmap/jon_snow" />-->

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="vertical">

                <TextView
                    android:id="@+id/text_view_creator"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Creator name"
                    android:textColor="@android:color/black"
                    android:textSize="20sp" />

                <TextView
                    android:id="@+id/text_view_rating"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Rating : "
                    android:textColor="@android:color/black"
                    android:textSize="14sp" />

            </LinearLayout>

            <!--<LinearLayout-->
                <!--android:layout_width="match_parent"-->
                <!--android:layout_height="wrap_content"-->
                <!--android:orientation="vertical"-->
                <!--android:paddingTop="8dp"-->
                <!--android:layout_marginLeft="50dp">-->

                <!--<TextView-->
                    <!--android:id="@+id/text_view_tags"-->
                    <!--android:layout_width="wrap_content"-->
                    <!--android:layout_height="wrap_content"-->
                    <!--android:text="Tags : "-->
                    <!--android:textColor="@android:color/black"-->
                    <!--android:textSize="14sp" />-->

                <!--<TextView-->
                    <!--android:id="@+id/text_view_downloads"-->
                    <!--android:layout_width="wrap_content"-->
                    <!--android:layout_height="wrap_content"-->
                    <!--android:text="Downloads : "-->
                    <!--android:textColor="@android:color/black"-->
                    <!--android:textSize="14sp" />-->

            <!--</LinearLayout>-->

        </LinearLayout>

    </LinearLayout>


</android.support.v7.widget.CardView>

tabsPager.java

public class tabsPager extends FragmentStatePagerAdapter {

    private final ArrayList<Fragment> fragmentList=new ArrayList<>();
    private final ArrayList<String> fragmentListTitles=new ArrayList<>();



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

    @Override
    public Fragment getItem(int position) {
        return fragmentList.get(position);
    }

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

    public void addFragment(Fragment fragment,String title){

        fragmentList.add(fragment);
        fragmentListTitles.add(title);
    }

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

SecondFragment.java

public class SecondFragment extends Fragment {
    private RecyclerView mrecyclerView;
    private ListAdapter mListAdapter;
    private ArrayList<PojoList> mPojolist;
    private RequestQueue mRequestQueue;
   // String url;
    double latitude;
    double longitude;
    private FusedLocationProviderClient client;
    String url;
    RecyclerView.LayoutManager mLayoutManager;


    public SecondFragment() {
        // Required empty public constructor
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        mPojolist=new ArrayList<>();
        View v= inflater.inflate(R.layout.fragment_second, container, false);
        mrecyclerView=v.findViewById(R.id.recycler_view);
        mrecyclerView.setHasFixedSize(true);
        mrecyclerView=new RecyclerView(getActivity());
        mLayoutManager=new LinearLayoutManager(this.getActivity());
        mrecyclerView.setLayoutManager(mLayoutManager);
        return v;
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        requestPermission();
        //mrecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayout.VERTICAL,false));
        mRequestQueue= Volley.newRequestQueue(getContext());

        client = LocationServices.getFusedLocationProviderClient(getContext());

        if (ActivityCompat.checkSelfPermission(getActivity(), ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

            return;
        }
        client.getLastLocation().addOnSuccessListener(getActivity(), new OnSuccessListener<Location>() {
            @Override
            public void onSuccess(Location location) {
                if(location!=null){
                    latitude=location.getLatitude();
                    longitude=location.getLongitude();


                 String url ="https://maps.googleapis.com/maps/api/place/search/json?location="+latitude+","+longitude+"&radius=3000&sensor=true&type=hospital&key=AIzaSyBLEPBRfw7sMb73Mr88L91Jqh3tuE4mKsE";
                    //parseJson();
                    JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET,url,null, new Response.Listener<JSONObject>() {
                        @Override
                        public void onResponse(JSONObject response) {
                            try {
                                Log.d("BNT",response.toString());
                                JSONArray jsonArray=response.getJSONArray("results");
                                for(int i=0;i<jsonArray.length();i++){
                                    JSONObject resultObject=jsonArray.getJSONObject(i);
                                    String name=resultObject.getString("name");
                                    Log.d("Name",name.toString());
                                   // int rating=resultObject.getInt("rating");
                                    //Log.d("Rating", String.valueOf(rating));

//                                    JSONArray photoArray=resultObject.getJSONArray("photos");
//                                    for(int j=0;j<photoArray.length();j++){
//                                        JSONObject photoObject=photoArray.getJSONObject(j);
//                                        String imgUrl=photoObject.getString("photo_reference");
//
//                                      ;
//                                    }
                                    mPojolist.add(new PojoList(name));
                                    Log.d("PojoList",mPojolist.toString());
                                }

                                mListAdapter=new ListAdapter(getContext(),mPojolist);
                                Log.d("MListAdapter",mListAdapter.toString());
                                mrecyclerView.setAdapter(mListAdapter);

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }
                    }, new Response.ErrorListener() {
                        @Override
                        public void onErrorResponse(VolleyError error) {
                            error.printStackTrace();
                        }
                    });
                    mRequestQueue.add(request);
                    Log.d("mRequestQueue",mRequestQueue.toString());
                }
            }
        });
    }

    private void requestPermission(){
        ActivityCompat.requestPermissions(getActivity(),new String[]{ACCESS_FINE_LOCATION},1);
    }
}

fragmentSecond.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

        <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">


                <android.support.v7.widget.RecyclerView
                    android:id="@+id/recycler_view"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_alignParentLeft="true"
                    android:layout_alignParentStart="true"
                    android:layout_alignParentTop="true"
                    android:background="@android:color/darker_gray" />
        </RelativeLayout>


</FrameLayout>