问从api获取数据可与https api配合使用，但不能与http api配合使用

EN

package com.example.parsaniahardik.json_recycler_retrofit;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.scalars.ScalarsConverterFactory;

public class MainActivity extends AppCompatActivity {

    private RetrofitAdapter retrofitAdapter;
    private RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        recyclerView = findViewById(R.id.recycler);

        fetchJSON();

    }

    private void fetchJSON(){

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(RecyclerInterface.JSONURL)
                .addConverterFactory(ScalarsConverterFactory.create())
                .build();

        RecyclerInterface api = retrofit.create(RecyclerInterface.class);

        Call<String> call = api.getString();

        call.enqueue(new Callback<String>() {
            @Override
            public void onResponse(Call<String> call, Response<String> response) {
                Log.i("Responsestring", response.body().toString());
                //Toast.makeText()
                if (response.isSuccessful()) {
                    if (response.body() != null) {
                        Log.i("onSuccess", response.body().toString());

                        String jsonresponse = response.body().toString();
                        writeRecycler(jsonresponse);

                    } else {
                        Log.i("onEmptyResponse", "Returned empty response");//Toast.makeText(getContext(),"Nothing returned",Toast.LENGTH_LONG).show();
                    }
                }
            }

            @Override
            public void onFailure(Call<String> call, Throwable t) {

            }
        });
    }

    private void writeRecycler(String response){

        try {
            //getting the whole json object from the response
            JSONObject obj = new JSONObject(response);
            if(obj.optString("status").equals("true")){

                ArrayList<ModelRecycler> modelRecyclerArrayList = new ArrayList<>();
                JSONArray dataArray  = obj.getJSONArray("data");

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

                    ModelRecycler modelRecycler = new ModelRecycler();
                    JSONObject dataobj = dataArray.getJSONObject(i);

                    modelRecycler.setName(dataobj.getString("name"));
                    modelRecycler.setCountry(dataobj.getString("country"));
                    modelRecycler.setCity(dataobj.getString("city"));

                    modelRecyclerArrayList.add(modelRecycler);

                }

                retrofitAdapter = new RetrofitAdapter(this,modelRecyclerArrayList);
                recyclerView.setAdapter(retrofitAdapter);
                recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL, false));

            }else {
                Toast.makeText(MainActivity.this, obj.optString("message")+"", Toast.LENGTH_SHORT).show();
            }

        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

public class RetrofitAdapter extends RecyclerView.Adapter<RetrofitAdapter.MyViewHolder> {

    private LayoutInflater inflater;
    private ArrayList<ModelRecycler> dataModelArrayList;

    public RetrofitAdapter(Context ctx, ArrayList<ModelRecycler> dataModelArrayList){

        inflater = LayoutInflater.from(ctx);
        this.dataModelArrayList = dataModelArrayList;
    }

    @Override
    public RetrofitAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View view = inflater.inflate(R.layout.retro_item, parent, false);
        MyViewHolder holder = new MyViewHolder(view);

        return holder;
    }

    @Override
    public void onBindViewHolder(RetrofitAdapter.MyViewHolder holder, int position) {


        holder.name.setText(dataModelArrayList.get(position).getName());
        holder.country.setText(dataModelArrayList.get(position).getCountry());
        holder.city.setText(dataModelArrayList.get(position).getCity());
    }

    @Override
    public int getItemCount() {
        return dataModelArrayList.size();
    }

    class MyViewHolder extends RecyclerView.ViewHolder{

        TextView country, name, city;


        public MyViewHolder(View itemView) {
            super(itemView);

            country = (TextView) itemView.findViewById(R.id.country);
            name = (TextView) itemView.findViewById(R.id.name);
            city = (TextView) itemView.findViewById(R.id.city);
    }

    }
}

public interface RecyclerInterface {

    String JSONURL = "https://demonuts.com/Demonuts/JsonTest/Tennis/";

    @GET("json_parsing.php")
    Call<String> getString();
}

public class ModelRecycler {

    private String name, country, city;



    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }
}