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Android JSON parsing using Volley

By July 12, 2017 0 Comments

My previous article Android JSON Parsing Tutorial explains parsing json in a simple manner which got very good feedback and good ranking in search engines. In this tutorial I want to explain the same but in a easy & robust way using volley library.

If you want to know more about Volley and it’s benefits, go through Android working with Volley Library.

android json parsing using volley
DOWNLOAD CODE

So let’s start this with a simple project.

Creating New Project

1. Create a new project in Eclipse from File ⇒ New ⇒ Android Application Project and fill all the required details.

I gave my project name as VolleyJson and package name as info.androidhive.volleyjson

2. Now create a new package under src folder by Right clicking on src ⇒ New ⇒ Package and give the package name as app. So my new package name will be info.androidhive.volleyjson.app

3. Download volley.jar and paste it in project’s libs folder.

4. Create a new class named AppController.java under app package. This is going to be a singleton class where we initialize all the volley core objects.

package info.androidhive.volleyjson.app;

import android.app.Application;
import android.text.TextUtils;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;
 
public class AppController extends Application {
 
    public static final String TAG = AppController.class.getSimpleName();
 
    private RequestQueue mRequestQueue;
 
    private static AppController mInstance;
 
    @Override
    public void onCreate() {
        super.onCreate();
        mInstance = this;
    }
 
    public static synchronized AppController getInstance() {
        return mInstance;
    }
 
    public RequestQueue getRequestQueue() {
        if (mRequestQueue == null) {
            mRequestQueue = Volley.newRequestQueue(getApplicationContext());
        }
 
        return mRequestQueue;
    }
 
    public <T> void addToRequestQueue(Request<T> req, String tag) {
        req.setTag(TextUtils.isEmpty(tag) ? TAG : tag);
        getRequestQueue().add(req);
    }
 
    public <T> void addToRequestQueue(Request<T> req) {
        req.setTag(TAG);
        getRequestQueue().add(req);
    }
 
    public void cancelPendingRequests(Object tag) {
        if (mRequestQueue != null) {
            mRequestQueue.cancelAll(tag);
        }
    }
}

5. AppController.java has to be executed when the app is launched. So add this class in your AndroidManifest.xml using name attribute for <application> tag.

Also add INTERNET permission as we need to make internet calls from the app.

<application
        android:name="info.androidhive.volleyjson.app.AppController">

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="info.androidhive.volleyjson"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="21" />
    
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" 
        android:name="info.androidhive.volleyjson.app.AppController">
        <activity
            android:name="info.androidhive.volleyjson.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

6. Open the layout file of main activity and add below code. (In my case my main activity layout file is activity_main.xml).

In this layout we are adding two Buttons and a TextView. In two Button, one is to invoke json object request and other is to invoke json array request. The TextView is used to display the parsed json response.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="${relativePackage}.${activityClass}" >

    <Button
        android:id="@+id/btnObjRequest"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="50dp"
        android:paddingLeft="15dp"
        android:paddingRight="15dp"
        android:text="Make JSON Object Request" />

    <Button
        android:id="@+id/btnArrayRequest"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="50dp"
        android:paddingLeft="15dp"
        android:paddingRight="15dp"
        android:text="Make JSON Array Request"
        android:layout_below="@id/btnObjRequest" />
    
    <TextView
        android:id="@+id/txtResponse"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/btnArrayRequest"
        android:layout_marginTop="40px"
        android:padding="20dp" />

</RelativeLayout>

7. Now open main activity class MainActivity.java and add basic code like importing UI elements, adding button click events and initializing other objects.

Below you can notice two methods makeJsonObjectRequest() and makeJsonArrayRequest(). But these methods left empty for now, we’ll add code for these methods in next steps.

package info.androidhive.volleyjson;

import info.androidhive.volleyjson.R;
import info.androidhive.volleyjson.app.AppController;

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

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.Request.Method;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.JsonObjectRequest;

public class MainActivity extends Activity {

	// json object response url
	private String urlJsonObj = "https://api.androidhive.info/volley/person_object.json";
	
	// json array response url
	private String urlJsonArry = "https://api.androidhive.info/volley/person_array.json";

	private static String TAG = MainActivity.class.getSimpleName();
	private Button btnMakeObjectRequest, btnMakeArrayRequest;

	// Progress dialog
	private ProgressDialog pDialog;

	private TextView txtResponse;

	// temporary string to show the parsed response
	private String jsonResponse;

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

		btnMakeObjectRequest = (Button) findViewById(R.id.btnObjRequest);
		btnMakeArrayRequest = (Button) findViewById(R.id.btnArrayRequest);
		txtResponse = (TextView) findViewById(R.id.txtResponse);

		pDialog = new ProgressDialog(this);
		pDialog.setMessage("Please wait...");
		pDialog.setCancelable(false);

		btnMakeObjectRequest.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				// making json object request
				makeJsonObjectRequest();
			}
		});

		btnMakeArrayRequest.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				// making json array request
				makeJsonArrayRequest();
			}
		});

	}

	/**
	 * Method to make json object request where json response starts wtih {
	 * */
	private void makeJsonObjectRequest() {
	}

	/**
	 * Method to make json array request where response starts with [
	 * */
	private void makeJsonArrayRequest() {
	}

	private void showpDialog() {
		if (!pDialog.isShowing())
			pDialog.show();
	}

	private void hidepDialog() {
		if (pDialog.isShowing())
			pDialog.dismiss();
	}
}

Normally json response will be of two types. It can be either json object or json array. If the json starts with {, it is considered to be JSON Object. As well if the json starts with [, then it is JSON Array.

Now we’ll see how to make these requests individually.

Making JSON Object Request

8. Volley provides JsonObjectRequest class to make json object request. Add the below code in makeJsonObjectRequest() method. Here we are fetching the json by making a call to below url and parsing it. Finally the parsed response is appended to a string and displayed on the screen.

Sample JSON Object Response

URL: https://api.androidhive.info/volley/person_object.json

{
	"name" : "Ravi Tamada", 
	"email" : "ravi8x@gmail.com",
	"phone" : {
		"home" : "08947 000000",
		"mobile" : "9999999999"
	}
	
}

	/**
	 * Method to make json object request where json response starts wtih {
	 * */
	private void makeJsonObjectRequest() {

		showpDialog();

		JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.GET,
				urlJsonObj, null, new Response.Listener<JSONObject>() {

					@Override
					public void onResponse(JSONObject response) {
						Log.d(TAG, response.toString());

						try {
							// Parsing json object response
							// response will be a json object
							String name = response.getString("name");
							String email = response.getString("email");
							JSONObject phone = response.getJSONObject("phone");
							String home = phone.getString("home");
							String mobile = phone.getString("mobile");

							jsonResponse = "";
							jsonResponse += "Name: " + name + "\n\n";
							jsonResponse += "Email: " + email + "\n\n";
							jsonResponse += "Home: " + home + "\n\n";
							jsonResponse += "Mobile: " + mobile + "\n\n";

							txtResponse.setText(jsonResponse);

						} catch (JSONException e) {
							e.printStackTrace();
							Toast.makeText(getApplicationContext(),
									"Error: " + e.getMessage(),
									Toast.LENGTH_LONG).show();
						}
						hidepDialog();
					}
				}, new Response.ErrorListener() {

					@Override
					public void onErrorResponse(VolleyError error) {
						VolleyLog.d(TAG, "Error: " + error.getMessage());
						Toast.makeText(getApplicationContext(),
								error.getMessage(), Toast.LENGTH_SHORT).show();
						// hide the progress dialog
						hidepDialog();
					}
				});

		// Adding request to request queue
		AppController.getInstance().addToRequestQueue(jsonObjReq);
	}

Making JSON Array Request

9. Volley provides JsonArrayRequest class to make json array request. Add the below code in makeJsonArrayRequest() method.

Sample JSON Array Response

URL: https://api.androidhive.info/volley/person_array.json

[
	{
	"name" : "Ravi Tamada", 
	"email" : "ravi8x@gmail.com",
	"phone" : {
		"home" : "08947 000000",
		"mobile" : "9999999999"
	}
	},
	{
	"name" : "Tommy", 
	"email" : "tommy@gmail.com",
	"phone" : {
		"home" : "08946 000000",
		"mobile" : "0000000000"
	}
	}
]

	/**
	 * Method to make json array request where response starts with [
	 * */
	private void makeJsonArrayRequest() {

		showpDialog();

		JsonArrayRequest req = new JsonArrayRequest(urlJsonArry,
				new Response.Listener<JSONArray>() {
					@Override
					public void onResponse(JSONArray response) {
						Log.d(TAG, response.toString());

						try {
							// Parsing json array response
							// loop through each json object
							jsonResponse = "";
							for (int i = 0; i < response.length(); i++) {

								JSONObject person = (JSONObject) response
										.get(i);

								String name = person.getString("name");
								String email = person.getString("email");
								JSONObject phone = person
										.getJSONObject("phone");
								String home = phone.getString("home");
								String mobile = phone.getString("mobile");

								jsonResponse += "Name: " + name + "\n\n";
								jsonResponse += "Email: " + email + "\n\n";
								jsonResponse += "Home: " + home + "\n\n";
								jsonResponse += "Mobile: " + mobile + "\n\n\n";

							}

							txtResponse.setText(jsonResponse);

						} catch (JSONException e) {
							e.printStackTrace();
							Toast.makeText(getApplicationContext(),
									"Error: " + e.getMessage(),
									Toast.LENGTH_LONG).show();
						}

						hidepDialog();
					}
				}, new Response.ErrorListener() {
					@Override
					public void onErrorResponse(VolleyError error) {
						VolleyLog.d(TAG, "Error: " + error.getMessage());
						Toast.makeText(getApplicationContext(),
								error.getMessage(), Toast.LENGTH_SHORT).show();
						hidepDialog();
					}
				});

		// Adding request to request queue
		AppController.getInstance().addToRequestQueue(req);
	}

Now run the project and test it once. You should able to see the parsed json displayed on the screen upon tapping the json request buttons.

android json parsing using volley

Complete Code

Here is the complete code of MainActivity.java

package info.androidhive.volleyjson;

import info.androidhive.volleyjson.R;
import info.androidhive.volleyjson.app.AppController;

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

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.Request.Method;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.JsonObjectRequest;

public class MainActivity extends Activity {

	// json object response url
	private String urlJsonObj = "https://api.androidhive.info/volley/person_object.json";
	
	// json array response url
	private String urlJsonArry = "https://api.androidhive.info/volley/person_array.json";

	private static String TAG = MainActivity.class.getSimpleName();
	private Button btnMakeObjectRequest, btnMakeArrayRequest;

	// Progress dialog
	private ProgressDialog pDialog;

	private TextView txtResponse;

	// temporary string to show the parsed response
	private String jsonResponse;

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

		btnMakeObjectRequest = (Button) findViewById(R.id.btnObjRequest);
		btnMakeArrayRequest = (Button) findViewById(R.id.btnArrayRequest);
		txtResponse = (TextView) findViewById(R.id.txtResponse);

		pDialog = new ProgressDialog(this);
		pDialog.setMessage("Please wait...");
		pDialog.setCancelable(false);

		btnMakeObjectRequest.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				// making json object request
				makeJsonObjectRequest();
			}
		});

		btnMakeArrayRequest.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				// making json array request
				makeJsonArrayRequest();
			}
		});

	}

	/**
	 * Method to make json object request where json response starts wtih {
	 * */
	private void makeJsonObjectRequest() {

		showpDialog();

		JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.GET,
				urlJsonObj, null, new Response.Listener<JSONObject>() {

					@Override
					public void onResponse(JSONObject response) {
						Log.d(TAG, response.toString());

						try {
							// Parsing json object response
							// response will be a json object
							String name = response.getString("name");
							String email = response.getString("email");
							JSONObject phone = response.getJSONObject("phone");
							String home = phone.getString("home");
							String mobile = phone.getString("mobile");

							jsonResponse = "";
							jsonResponse += "Name: " + name + "\n\n";
							jsonResponse += "Email: " + email + "\n\n";
							jsonResponse += "Home: " + home + "\n\n";
							jsonResponse += "Mobile: " + mobile + "\n\n";

							txtResponse.setText(jsonResponse);

						} catch (JSONException e) {
							e.printStackTrace();
							Toast.makeText(getApplicationContext(),
									"Error: " + e.getMessage(),
									Toast.LENGTH_LONG).show();
						}
						hidepDialog();
					}
				}, new Response.ErrorListener() {

					@Override
					public void onErrorResponse(VolleyError error) {
						VolleyLog.d(TAG, "Error: " + error.getMessage());
						Toast.makeText(getApplicationContext(),
								error.getMessage(), Toast.LENGTH_SHORT).show();
						// hide the progress dialog
						hidepDialog();
					}
				});

		// Adding request to request queue
		AppController.getInstance().addToRequestQueue(jsonObjReq);
	}

	/**
	 * Method to make json array request where response starts with [
	 * */
	private void makeJsonArrayRequest() {

		showpDialog();

		JsonArrayRequest req = new JsonArrayRequest(urlJsonArry,
				new Response.Listener<JSONArray>() {
					@Override
					public void onResponse(JSONArray response) {
						Log.d(TAG, response.toString());

						try {
							// Parsing json array response
							// loop through each json object
							jsonResponse = "";
							for (int i = 0; i < response.length(); i++) {

								JSONObject person = (JSONObject) response
										.get(i);

								String name = person.getString("name");
								String email = person.getString("email");
								JSONObject phone = person
										.getJSONObject("phone");
								String home = phone.getString("home");
								String mobile = phone.getString("mobile");

								jsonResponse += "Name: " + name + "\n\n";
								jsonResponse += "Email: " + email + "\n\n";
								jsonResponse += "Home: " + home + "\n\n";
								jsonResponse += "Mobile: " + mobile + "\n\n\n";

							}

							txtResponse.setText(jsonResponse);

						} catch (JSONException e) {
							e.printStackTrace();
							Toast.makeText(getApplicationContext(),
									"Error: " + e.getMessage(),
									Toast.LENGTH_LONG).show();
						}

						hidepDialog();
					}
				}, new Response.ErrorListener() {
					@Override
					public void onErrorResponse(VolleyError error) {
						VolleyLog.d(TAG, "Error: " + error.getMessage());
						Toast.makeText(getApplicationContext(),
								error.getMessage(), Toast.LENGTH_SHORT).show();
						hidepDialog();
					}
				});

		// Adding request to request queue
		AppController.getInstance().addToRequestQueue(req);
	}

	private void showpDialog() {
		if (!pDialog.isShowing())
			pDialog.show();
	}

	private void hidepDialog() {
		if (pDialog.isShowing())
			pDialog.dismiss();
	}
}
Ravi Tamada
Hi there! I am Founder at androidhive and programming enthusiast. My skills includes Android, iOS, PHP, Ruby on Rails and lot more. If you have any idea that you would want me to develop? Let’s talk: ravi@androidhive.info

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    I am using jsonarrayrequest and it causes myapp keeps stopping

    • Check the LogCat for errors.

      • zahra mohebi

        plzz delete ad from your site
        its distracting really

        • Ads pays the server bills and other expenditures to run the blog.

  • Anmol Jindal

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  • Mochamad Iqbal

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  • Mücahid Bilgili

    Thanks…You were very helpful.

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  • Prasad Vennam

    im getting error here

    please help me

    // Adding request to request queue
    AppController.getInstance().addToRequestQueue(req);

    • Yogesh Machhi

      same error…..help plzz

      • javed

        same error….

        • Any error report?

          • Disha

            Caused by: java.lang.NullPointerException: Attempt to invoke virtual method ‘void com.example.admin.litebulb.AppVolleyController.addToRequestQueue(com.android.volley.Request, java.lang.String)’ on a null object reference

            This is the error here
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          • Add AppVolleyController to your manifest file.

  • Rajendra

    Some time Error in Volly like as com.android.volley.TimeoutError to get the data from the server.
    So Please Kindly Help this regarding Solve this error

  • Supriyanto

    How to fix this problem

    Error:(62, 23) error: TAG has private access in FragmentActivity

  • Waseem

    Hi,

    I used your method with some modification (makeJsonObject),
    But programe going inside to the method makeJsonObject and

    not going in site to

    JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.GET,
    urlJsonObj+id, null, new Response.Listener() {

    }

    may know why this happening?

    • What is the url you are trying to parse (I need to see the json data). Also print the error in onError method.

  • Dinesh

    Hello Ravi,
    I want to print my error from “onErrorResponse”. I know how to print but i want to print separately on different text view.
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  • Keima

    Good day Ravi, i would just like to ask. What is the problem with my connection?

    @Override
    protected String doInBackground(String… params) {
    try {
    // Enter URL address where your php file resides
    url = new URL(“http://mysite/sitepath/login.php”);
    //url = new URL(“http://192.168.56.1/login/login.php”);
    } catch (MalformedURLException e) {
    // TODO Auto-generated catch block
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    I am not having problem when i’m connected to my localhost but when i used the website url it doesnt show any message and my login path isnt working. Hope you can help me regarding this. MORE POWER TO YOU MAN!

    • Hi Keima

      Is your url accessible via Postman?

  • Monica

    Hi Ravi,
    The above code tells about accessing an API at the server and retrieving the data either as an object or an array.
    My need is to send send the data to an API, that in turn saves the data on to a database and returns status. How to do this with Volley

  • Ban Midou

    Hello Ravi
    is there any tutorial for Volley Json Parsing in Android Studio ? cause i don’t have Eclipse…..

  • David Iya

    Hello Ravi thank you for your tutorial i have question
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  • Rivaldo Christian

    Hello Ravi

    I’m frustration with my code. I already got some reference from stack overflow but no luck.
    This is regarding passing the data with authentication header. Please note I’ve been tested POSTMAN and no issue. The data success to record (using unique ID as authentication key)

    See my code
    Please advice if you see something wrong. For the record I got error : Volley : Unexpected response code 400

    anyway if you have any reference please let me know.
    @Override
    public String getBodyContentType(){
    return “application/json”;
    }

    @Override
    public Map getHeaders() throws AuthFailureError{

    // Posting params to register url
    // data you want to save to SQL
    //once validation completed
    Log.d(TAG, “getHeaders with unique ” + apiKey);
    HashMap headers = new HashMap();
    String auth = apiKey; Log.d(TAG, “getHeaders with unique ” + apiKey);
    headers.put(“Authorization “, apiKey);
    System.out.println(“selesai jalankan headers”);
    return headers;

    }

    @Override
    public Map getParams() throws AuthFailureError{

    // Posting params to register url
    // data you want to save to SQL
    HashMap params = new HashMap();
    params.put(“kostName”, kostname);
    params.put(“kostAddress”, kostaddress);
    System.out.println(“selesai jalankan params”);
    return params;
    }

    };

    // Adding request to request queue
    AppController.getInstance().addToRequestQueue(strReq, tag_string_req);

    • When are you getting 400 request? Requested from the mobile?

      • Rivaldo Christian

        I’m running the application through geany motion. See the logcat:

        01-31 07:58:13.888 D/AddKostActivity( 1499): ID Unique292 d2803a15284826cf2e32bd4fdc20c655
        01-31 07:58:13.889 D/AddKostActivity( 1499): URL http://192.168.56.1:81/crystal/v1/addkost
        01-31 07:58:13.944 D/AddKostActivity( 1499): getHeaders with unique d2803a15284826cf2e32bd4fdc20c655
        01-31 07:58:13.944 D/AddKostActivity( 1499): getHeaders with unique d2803a15284826cf2e32bd4fdc20c655
        01-31 07:58:13.944 I/System.out( 1499): selesai jalankan headers
        01-31 07:58:13.944 D/NetworkSecurityConfig( 1499): No Network Security Config specified, using platform default
        01-31 07:58:13.959 I/System.out( 1499): selesai jalankan params
        01-31 07:58:14.622 E/Volley ( 1499): [120] BasicNetwork.performRequest: Unexpected response code 400 for http://192.168.56.1:81/crystal/v1/addkost
        01-31 07:58:14.677 E/AddKostActivity( 1499): Error is: null
        01-31 07:58:15.284 I/ActivityManager( 558): Waited long enough for: ServiceRecord{7973028 u0 com.android.calendar/.alerts.InitAlarmsService}

        • Rivaldo Christian

          I’m pretty sure the authentication are correct since I already tested from POSTMAN

          • Its because of WAMP / MAMP configuration. Search for WAMP 400 bad request. You need to do few modifications in apache config.

          • Rivaldo Christian

            Hi Ravi,

            I’m trying to figure out regards what you mention before for couple day but still stuck to get what’s wrong with this :
            01-31 07:58:14.622 E/Volley ( 1499): [120] BasicNetwork.performRequest: Unexpected response code 400 for http://192.168.56.1:81/crystal/v1/addkost

            so there are some log from my web server but I don’t understand (already see stackoverflow)
            –access log–
            192.168.56.1 – – [02/Feb/2018:15:38:32 +0800] “POST /crystal/v1/addkost HTTP/1.1” 400 226
            192.168.56.1 – – [02/Feb/2018:15:38:34 +0800] “POST /crystal/v1/addkost HTTP/1.1” 400 226
            192.168.56.1 – – [02/Feb/2018:15:38:35 +0800] “POST /crystal/v1/addkost HTTP/1.1” 400 226
            192.168.56.1 – – [02/Feb/2018:15:57:03 +0800] “POST /phpmyadmin/index.php HTTP/1.1” 200 1367

            how about my error log ? kindly see
            –error log–
            [Thu Feb 01 20:48:39.801011 2018] [core:notice] [pid 7332:tid 272] AH00094: Command line: ‘C:\Bitnami\WAMPST~1.23-\apache2\bin\httpd.exe -d C:/Bitnami/wampstack-7.0.23-0/apache2 -f C:\Bitnami\WAMPST~1.23-\apache2\conf\httpd.conf’
            [Thu Feb 01 20:48:39.819013 2018] [mpm_winnt:notice] [pid 7332:tid 272] AH00418: Parent: Created child process 5480
            [Thu Feb 01 20:48:40.633116 2018] [ssl:warn] [pid 5480:tid 156] AH01909: localhost:443:0 server certificate does NOT include an ID which matches the server name
            [Thu Feb 01 20:48:40.966159 2018] [ssl:warn] [pid 5480:tid 156] AH01909: localhost:443:0 server certificate does NOT include an ID which matches the server name

            and truly I don’t understand. If you have any reference for my code please help to provide.

          • Rivaldo Christian

            Hi Ravi thank for reference but the issue isn’t from SSL

            so I decide to debug using Fiddler and found the issue. So authentication success to pass but Apache not count as Authentication key. I attempt to use Proxy Authentication and is detected and success. Getting frustration but need to resolve it. hehehe
            In case you have one similar this issue, please share with me

            I still do research for this cases. Two weeks has passed for this case. hiks

          • Yup sometime it takes years 🙂

  • Shubham Kumar

    what is the use of singleton class?

  • Pritom Sarker

    I am facing this problem

    Error:Execution failed for task ‘:app:transformDexArchiveWithExternalLibsDexMergerForDebug’.
    > com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex

    • It might be because of multiple libraries added in build.gradle. Search for ‘Android MultiDex support’.

    • Joseph Kiran

      If you added any volley library remove it from your app level build.gradle .It just worked for me..!

  • Neville Narcis

    Hi Ravi,
    My issue is a bit different from this blog. its that i’m using a post request and i’m sending authorization in header and a single parameter but in getting a Volly.serverError something like that can you tell me the reason ?????? Please help with this issue

  • Lakshay

    Hello. Just wanted to ask that why did you use .json file to get json data. And also can’t we use a .php file which echo’s json encode

    • I used static .json file to reduce burden on server. As running php file takes some CPU and other resources, I kept direct static json file. You can use php echo to do the same.

  • akshay vyash

    Thank you sir for this tutorial but i hv one problem, i hv large amount of json data can i parse smoothly those json data using this tutorial??

  • Joel Cotto

    Hi Ravi,
    Will it be possible to call the request from a second activity and display the output on the main activity? any command line that I need to add?

    • You can use Intent to send the data between activities.

  • Is there any error in LogCat? Also this line is wrong.

    countries.add(“india”); (you are not adding the variable instead adding the string “india”)

    Should be

    countries.add(india);

  • Rafael Raymundes

    Hi,
    I need to send json parameters like the image … How can i send this kind of json parameters?
    Like this :
    {“LoginRequest”: {
    “request_datetime”: null,
    “SeguridadManager”: {
    “usuario”: “jfloresn”,
    “password”: “Peru123456”,
    “IMEI”: “4564646464646”,
    “numero_celular”: “940717493”
    }
    }
    }

    helpme please

  • Adnan Tuhcic

    Hi,
    i want to use the jsonObject Request but there is one problem:
    when i click on the Button “MAKE JSON OBJECT REQUEST” my app close.
    did anybody had the same problem and found any solution??
    or can anybody help me here with this?

    please help

  • Mitesh Makwana

    how to pass Headers in volley?

    • Mitesh Makwana

      got solution by adding this

      @Override
      public Map getHeaders() throws AuthFailureError {
      Map headers = new HashMap();
      /*String credentials = “username:password”;
      String auth = “Basic ”
      + Base64.encodeToString(credentials.getBytes(), Base64.NO_WRAP);
      headers.put(“Content-Type”, “application/json”);
      headers.put(“Authorization”, auth);*/
      headers.put(“header-key”, “header-value”);

      return headers;
      }

  • Syahmi Shafawi

    hi, why my add toRequestQueue is null? I follow your instruction but my cide not working.

    ‘void com.example.simplevolley.simplevolley.AppController.addToRequestQueue(com.android.volley.Request)’ on a null object reference.

    can give me some assist…

    • Syahmi Shafawi

      well, I forget to put android:name=”com.example.simplevolley.simplevolley.AppController” in manifest.xml. Thank you for the tutorial

  • Nice article.
    How can I use this whit AsyncTask? Or it not needed?

    • Volley internally uses AsyncTask to make the calls. So you don’t have to write again.

  • datapoint solution

    hello perfect work I have some problem i want to call jsonArray method inside jsonObject mothed.
    when I call it my response goes for NORMAL null and wait when jsonObect finished

    • Can you post your code?

      • datapoint solution

        private void parseJson(String url) {

        if (page_id > last_page && last_page>0)
        return;
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url + page_id, null,
        new Response.Listener() {
        @Override
        public void onResponse(JSONObject response) {
        try {
        mPostView= new ArrayList();
        page_id++;

        JSONArray jsonArray = response.getJSONArray(“data”);
        last_page = response.getInt(“last_page”);
        for (int i = 0; i < jsonArray.length(); i++) {
        JSONObject data = jsonArray.getJSONObject(i);
        int id = data.getInt("id");
        String title =data.getString("title");
        int o = 60;
        String content = data.getString("content");

        sliderImgValue = new ArrayList();

        sendRequest(request_url,id);
        // sliderImgResult.addAll(sliderImgValue);
        mPostView.add(new postView(sliderImgValue, title, o, id, content));
        }
        mPostAdapter.addData(mPostView);
        mPostAdapter.notifyDataSetChanged();

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

        }

        public void sendRequest(String url,int id){

        JsonArrayRequest request = new JsonArrayRequest(Request.Method.GET, url+id , null, new Response.Listener() {
        @Override
        public void onResponse(JSONArray response) {
        List sliderImg = new ArrayList();
        for(int i = 0; i < response.length(); i++){

        try {
        JSONObject jsonObject = response.getJSONObject(i);

        sliderImg.add(jsonObject.getString("content"));

        } catch (JSONException e) {
        e.printStackTrace();
        }
        }
        sliderImgValue.addAll(sliderImg);

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

        }
        });

        // CustomVolleyRequest.getInstance(getContext()).addToRequestQueue(jsonArrayRequest);
        AppController.getInstance().addToRequestQueue(request);
        }

      • datapoint solution

        private void parseJson(String url) {

        if (page_id > last_page && last_page>0)
        return;
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url + page_id, null,
        new Response.Listener() {
        @Override
        public void onResponse(JSONObject response) {
        try {
        mPostView= new ArrayList();
        page_id++;

        JSONArray jsonArray = response.getJSONArray(“data”);
        last_page = response.getInt(“last_page”);
        for (int i = 0; i < jsonArray.length(); i++) {
        JSONObject data = jsonArray.getJSONObject(i);
        int id = data.getInt("id");
        String title =data.getString("title");
        int o = 60;
        String content = data.getString("content");

        sliderImgValue = new ArrayList();

        sendRequest(request_url,id);
        // sliderImgResult.addAll(sliderImgValue);
        mPostView.add(new postView(sliderImgValue, title, o, id, content));
        }
        mPostAdapter.addData(mPostView);
        mPostAdapter.notifyDataSetChanged();

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

        }

        public void sendRequest(String url,int id){

        JsonArrayRequest request = new JsonArrayRequest(Request.Method.GET, url+id , null, new Response.Listener() {
        @Override
        public void onResponse(JSONArray response) {
        List sliderImg = new ArrayList();
        for(int i = 0; i < response.length(); i++){

        try {
        JSONObject jsonObject = response.getJSONObject(i);

        sliderImg.add(jsonObject.getString("content"));

        } catch (JSONException e) {
        e.printStackTrace();
        }
        }
        sliderImgValue.addAll(sliderImg);

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

        }
        });

        // CustomVolleyRequest.getInstance(getContext()).addToRequestQueue(jsonArrayRequest);
        AppController.getInstance().addToRequestQueue(request);
        }

        • datapoint solution

          hello I found the error only ordering code just access the adapter from the second not from the first method

  • datapoint solution

    private void parseJson(String url) {

    if (page_id > last_page && last_page>0)
    return;
    JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url + page_id, null,
    new Response.Listener() {
    @Override
    public void onResponse(JSONObject response) {
    try {
    mPostView= new ArrayList();
    page_id++;

    JSONArray jsonArray = response.getJSONArray(“data”);
    last_page = response.getInt(“last_page”);
    for (int i = 0; i < jsonArray.length(); i++) {
    JSONObject data = jsonArray.getJSONObject(i);
    int id = data.getInt("id");
    String title =data.getString("title");
    int o = 60;
    String content = data.getString("content");

    sliderImgValue = new ArrayList();

    sendRequest(request_url,id);
    // sliderImgResult.addAll(sliderImgValue);
    mPostView.add(new postView(sliderImgValue, title, o, id, content));
    }
    mPostAdapter.addData(mPostView);
    mPostAdapter.notifyDataSetChanged();

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

    }

    public void sendRequest(String url,int id){

    JsonArrayRequest request = new JsonArrayRequest(Request.Method.GET, url+id , null, new Response.Listener() {
    @Override
    public void onResponse(JSONArray response) {
    List sliderImg = new ArrayList();
    for(int i = 0; i < response.length(); i++){

    try {
    JSONObject jsonObject = response.getJSONObject(i);

    sliderImg.add(jsonObject.getString("content"));

    } catch (JSONException e) {
    e.printStackTrace();
    }
    }
    sliderImgValue.addAll(sliderImg);

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

    }
    });

    // CustomVolleyRequest.getInstance(getContext()).addToRequestQueue(jsonArrayRequest);
    AppController.getInstance().addToRequestQueue(request);
    }

  • Jayesh Pansheriya

    hello sir
    in volley library i have added volley dependencies so now volly.jar is compulsory to add or not?

    • Not needed. Adding .jar is older way of doing it.

  • IDREAM SANKAR

    how to send json data to server with header authentication ?? help me sir

  • Manohar

    hello sir,
    I’m getting the data from JSON file into the Strigns
    but they are not adding into the List.
    please help me out !!!

    • Any error in LogCat? Post your code.

      • Manohar

        No error
        if I add to the list from outside the for loop it is adding
        but if i add the data from inside the loop it is not adding

  • After the for the loop you need to call notify data changed on adapter to refresh the list. Are you doing it?

    • Manohar

      i have called it
      the data from JSON file is fetched into two strings but they are not adding into the list

      if i try to add dummy items into the list from a seperate loop then they are adding

  • Yin SoThearith

    Why Attempt to invoke virtual method ‘com.android.volley.Request com.android.volley.RequestQueue.add(com.android.volley.Request)’ on a null object reference ?

    I have extends class with Application and add name to Application in Manifest already.

  • Jose A. Huanca Ancajima

    excelente post, te lo agradezco, tengo una duda
    ¿Como se cuando la pila ya ejecuto todas las peticiones? Quiero hacer muchas peticiones a un servidor y que cuando ya haya de responder a todas ejecutar otro código, lo que pasa es que las peticiones se ejecutan en otro hilo y como obtengo respuesta de este que ya realizo su tarea

  • Nimit Goyal

    why is this AppController class added?? The code is also working without the AppController class

  • IHSAN ULLAH

    I want to get data from server and data format is in an object How i will get it from URL please help me

    {
    “success”:true,
    “timestamp”:1533875487,
    “base”:”EUR”,
    “date”:”2018-08-10″,
    “rates”:{
    “AED”:4.235626,
    “AFN”:84.799019,
    “ALL”:125.724519,
    “AMD”:558.558733,
    “ANG”:2.140242,
    “AOA”:299.350794,
    “ZWL”:371.71291
    }
    }