Trying to extract a specific JSON key, app keep crashing

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I am trying to follow a tutorial on YT on extracting a specific value from a key, I am trying to work with a gov api.

This is the JSON output im trying to work with: here

I am trying to edit a TextView, named "num" and make it the value of the key "mispar_rechev" on that JSON.

This is my code:

    package com.example.rechev;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class MainActivity extends AppCompatActivity {


    public TextView num = findViewById(R.id.test_t);
    public RequestQueue mRequestQueue;


    private void parseJSON(){

        String url = "https://data.gov.il/api/action/datastore_search?resource_id=8fc424a7-2ecd-4180-852d-8fadd67abf20&filters={%22mispar_rechev%22:%225970065%22}";
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                try {
                    JSONArray jsonArray = response.getJSONArray("records");
                    for (int i = 0; i < jsonArray.length(); i++){
                        JSONObject number = jsonArray.getJSONObject(i);

                        int carNumber = number.getInt("mispar_rechev");

                        num.setText(carNumber);

                    }

                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                error.printStackTrace();
            }
        });

    }



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mRequestQueue = Volley.newRequestQueue(this);
        parseJSON(); // trying to call the function on start up.


    }

}

Thanks in advance.


Change

public TextView num = findViewById(R.id.test_t); 

to

public TextView num;

Change

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mRequestQueue = Volley.newRequestQueue(this);
        parseJSON(); // trying to call the function on start up.
    }

To

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        num = findViewById(R.id.test_t); 
        mRequestQueue = Volley.newRequestQueue(this);
        parseJSON(); // trying to call the function on start up.
    }

You are trying to write things to a NULL TextView as this cannot be initialized until after setContentView()

You also need to change Change num.setText(carNumber); to num.setText(String.valueOf(carNumber))

Issue extracting JSON response data, 1) The "response" is a JSON Object, not JSON Array. above statements in the "​try" block, // catch the exception here, so the app doesn't crash. (Keep in mind your entire JSON string is an object itself.)} Means the end of an object. "variable" (with quotes! important in JSON, but not when accessing/declaring javascript objects) assigns a property to your object.: Is the assignment operator in both JSON and JavaScript objects.


Change num.setText(carNumber) to num.setText(String.valueOf(carNumber))

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in your code TRY

num.setText(carNumber.toString());

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