MainActivity

package com.ilb.deds3c.fetch;

import android.app.Activity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.app.ProgressDialog;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;

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

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private EditText id;
    private Button buttonGet;
    private TextView textViewResult;

    private ProgressDialog loading;

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

        id = (EditText) findViewById(R.id.editTextId);
        buttonGet = (Button) findViewById(R.id.buttonGet);
        textViewResult = (TextView) findViewById(R.id.textViewResult);

        buttonGet.setOnClickListener(this);
    }

    private void getData() {
        String id1 = id.getText().toString().trim();
        if (id1.equals("")) {
            Toast.makeText(this, "Please enter an id", Toast.LENGTH_LONG).show();
            return;
        }
        loading = ProgressDialog.show(this,"Please wait...","Fetching...",false,false);

        String url = Config.DATA_URL+id.getText().toString().trim();

        StringRequest stringRequest = new StringRequest(url, new Response.Listener<String>() {

            @Override
            public void onResponse(String response) {
                loading.dismiss();
                showJSON(response);
            }
        },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        Toast.makeText(MainActivity.this,error.getMessage().toString(),Toast.LENGTH_LONG).show();
                    }
                });

        RequestQueue requestQueue = Volley.newRequestQueue(this);
        requestQueue.add(stringRequest);
    }

    private void showJSON(String response){
        String name = "";
        String phone = "";
        String username = "";
        String email = "";
        String password = "";
        try {
            JSONObject jsonObject = new JSONObject(response);
            JSONArray result = jsonObject.getJSONArray(Config.JSON_ARRAY);
            JSONObject c = result.getJSONObject(0);

            name = c.getString(Config.KEY_NAME);
            phone = c.getString(Config.KEY_PHONE);
            username = c.getString(Config.KEY_USERNAME);
            email = c.getString(Config.KEY_EMAIL);
            password = c.getString(Config.KEY_PASSWORD);

        } catch (JSONException e) {
            e.printStackTrace();
        }
        textViewResult.setText("Name:\t"+name+"\nPhone:\t"+phone+"\nUsername:\t"+username+"\nEmail:\t"+email+"\nPassword:\t"+password);
        //textViewResult.setText(name);
        //textViewResult.setText(phone);
        //textViewResult.setText(username);
        //textViewResult.setText(email);
        //textViewResult.setText(password);
    }

    @Override
    public void onClick(View v) {
        getData();
    }
}