Volley Parsing (ListView)

activity_main.xml

<ListView 
          android:id="@+id/listitems"
          />

<Button
        android:id="@+id/button"
        android:onClick="parseJSON"
        />

build.gradle (module app)

implementation 'com.android.volley:volley:1.0.0'

MainActivity.java

public class MainActivity extends AppCompatActivity {
  //private TextView result;
  private RequestQueue rqueue;
  private ArrayList<String> items;
  private ArrayAdapter<String> itemsAdapter;
  private ListView lvItems;

  protected void onCreate(Bundle savedInstanceState) {
    lvItems = (ListView) findViewById(R.id.listitems);
    //result = findViewById(R.id.view_parsed);
    Button button = findViewById(R.id.button);
    rqueue = Volley.newRequestQueue(this);
  }
  
      public void parseJSON(View view) {
        String url = "http://anontech.info/courses/cse491/employees.json";
        JsonArrayRequest request = new JsonArrayRequest(Request.Method.GET, url, null,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        try {
                            items = new ArrayList<String>();
                            itemsAdapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1, items);
                            if(lvItems!=null) {
                                lvItems.setAdapter(itemsAdapter);
                            }

                            for(int i=0;i<response.length();i++){
                            JSONObject jsonem = response.getJSONObject(i);
                            String name = jsonem.getString("name");
                            JSONObject loc = jsonem.getJSONObject("location");
                            String lat = loc.getString("latitude");
                            String lon = loc.getString("longitude");

                            //result.append(name+" Latitude/Longitude: "+lat+lon);
                            itemsAdapter.add(name);
                            }
                        } catch (JSONException e){
                            e.printStackTrace();
                        }

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

        rqueue.add(request);

    }