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public class MainActivity extends AppCompatActivity {
    private TextView textView;
    private RequestQueue requestQueue;

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

        textView = findViewById(R.id.textView_result);
        Button button = findViewById(R.id.button_parse);

        requestQueue = Volley.newRequestQueue(this);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                jsonParse();
            }
        });
    }
    private void jsonParse(){
        String url = "https://api.myjson.com/bins/iogw3";
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {

                try {
                    JSONArray jsonArray = response.getJSONArray("employees");
                    for (int i = 0; i <jsonArray.length() ; i++) {

                        JSONObject employee = jsonArray.getJSONObject(i);

                        String firstName = employee.getString("firstname");
                        int age = employee.getInt("age");
                        String mail = employee.getString("mail");
                        textView.append(firstName +" , "+ String.valueOf(age) +" , "+mail+"\n\n");
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }

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

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:gravity="center">

    <TextView
        android:id="@+id/textView_result"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
         />

    <Button
        android:id="@+id/button_parse"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView_result"
        android:layout_marginTop="30dp"
        android:text="Parse" />

</RelativeLayout>

implementation 'com.android.volley:volley:1.1.1'