java - How i use my JsonArray in listview android?

Question

hope you all are fine . I am developing weather app in android where android app get data from server in json format. In log file you can see that i successfully get my json data using volley, now i want to display that data in list view. How i will do that ???

    package com.example.the_weather_forecast;
    
    import androidx.appcompat.app.AppCompatActivity;
    
    import android.os.Bundle;
    import android.util.Log;
    import android.widget.ArrayAdapter;
    import android.widget.ListView;
    
    import com.android.volley.Request;
    import com.android.volley.RequestQueue;
    import com.android.volley.Response;
    import com.android.volley.RetryPolicy;
    import com.android.volley.VolleyError;
    import com.android.volley.toolbox.JsonArrayRequest;
    import com.android.volley.toolbox.Volley;
    
    import org.json.JSONArray;
    import org.json.JSONException;
    
    import java.util.ArrayList;
    
    public class MainActivity extends AppCompatActivity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            ArrayList<String> tubeLines = new ArrayList<String>();
    
            String URL = "xyz";
    
            RequestQueue requestQueue = Volley.newRequestQueue(this);
    
            JsonArrayRequest getRequest = new JsonArrayRequest(Request.Method.GET, URL, null,
                    new Response.Listener<JSONArray>()
                    {
                        @Override
                        public void onResponse(JSONArray response) {
                            // display response
                            Log.d("Response", response.toString());
                            for(int i=0;i<response.length();i++){
                                try {
                                    JSONArray jsonArray = response.getJSONArray(i);
                                    String x = jsonArray.toString();
                                    tubeLines.add(x);
                                    System.out.println("reached" + x);
                                } catch (JSONException e) {
                                    e.printStackTrace();
                                }
                            }
                        }
                    },
                    new Response.ErrorListener()
                    {
                        @Override
                        public void onErrorResponse(VolleyError error) {
                            Log.d("Error.Response", error.toString());
                        }
                    }
            );
            getRequest.setRetryPolicy(new RetryPolicy() {
                @Override
                public int getCurrentTimeout() {
                    return 50000;
                }
    
                @Override
                public int getCurrentRetryCount() {
                    return 50000;
                }
    
                @Override
                public void retry(VolleyError error) throws VolleyError {
    
                }
            });
            ListView myListView = (ListView)findViewById(R.id.myListview);
            ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, 
            android.R.layout.simple_list_item_1, tubeLines);
            myListView.setAdapter(arrayAdapter);
            // add it to the RequestQueue
            requestQueue.add(getRequest);
        }
    }

Log File : This my json data which i am receiving from my server D/Response: [[10,10,10,10,15,17,13,11],[12,8,8,8,9,9,14,10],[0,0,0,0,0,0,0,0]]

Answer 1

move your listview code inside onResponse and below to for loop because as per your code first empty array adapter set to listview and after that response receive from api using requestQueue.add(getRequest).

JsonArrayRequest getRequest = new JsonArrayRequest(Request.Method.GET, URL, null,
                new Response.Listener<JSONArray>()
                {
                    @Override
                    public void onResponse(JSONArray response) {
                        // display response
                        Log.d("Response", response.toString());
                        for(int i=0;i<response.length();i++){
                            try {
                                JSONArray jsonArray = response.getJSONArray(i);
                                String x = jsonArray.toString();
                                tubeLines.add(x);
                                System.out.println("reached" + x);
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }

                        }
         ListView myListView = (ListView)findViewById(R.id.myListview);
         ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, 
         android.R.layout.simple_list_item_1, tubeLines);
         myListView.setAdapter(arrayAdapter);
                    }
                },
                new Response.ErrorListener()
                {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        Log.d("Error.Response", error.toString());
                    }
                }
        );
        getRequest.setRetryPolicy(new RetryPolicy() {
            @Override
            public int getCurrentTimeout() {
                return 50000;
            }

            @Override
            public int getCurrentRetryCount() {
                return 50000;
            }

            @Override
            public void retry(VolleyError error) throws VolleyError {

            }
        });
        
        // add it to the RequestQueue
        requestQueue.add(getRequest);
    }