Android Volley Tutorial With Example

This is android volley tutorial. Here you will learn about android volley library and how to use it.

What is Volley?

Volley is a network library that helps in doing network related operations like fetching image or data.

Here are some features of this library.

Supports request queuing and prioritization

Effective cache management

Multiple concurrent network connections can be established

Supports request cancelling

No need to use asynctask as it performs all network operations asynchronously.

Android Volley Tutorial

Using volley we can fetch simple string, image or json data. Below I have given example for each of them.

First we create a request; it can be string, image or json. Then create a request queue and finally add the request in the request queue.

Pre-requisites

1. Add volley support in build.gradle by adding following line under dependencies section. After adding just sync the project.

compile 'com.android.volley:volley:1.0.0'

1	compile 'com.android.volley:volley:1.0.0'

2. Add internet access permission in AndroidManifest.xml file.

<uses-permission android:name="android.permission.INTERNET"/>

1	<uses-permission android:name="android.permission.INTERNET"/>

Fetching String Data

StringRequest class is used to create a string request. We specify the URL and then receive the string in response. Below example shows how to do this.

Create an android project with package name com.androidvolleyexample and add following code in respective files.

activity_main.xml

<LinearLayout 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" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:id="@+id/txt"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btn"
        android:text="Fetch Data"/>

</LinearLayout>

<LinearLayout 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" android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"

android:orientation="vertical">

<TextView

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginBottom="10dp"

android:id="@+id/txt"/>

<Button

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:id="@+id/btn"

android:text="Fetch Data"/>

</LinearLayout>

MainActivity.xml

package com.androidvolleyexample;

import android.app.Activity;
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.StringRequest;
import com.android.volley.toolbox.Volley;


public class MainActivity extends Activity {
    TextView txt;
    Button btn;
    String url ="https://www.thecrazyprogrammer.com/wp-content/uploads/demo.txt";

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

        txt = (TextView)findViewById(R.id.txt);
        btn = (Button)findViewById(R.id.btn);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                StringRequest request = new StringRequest(Request.Method.GET, url, new Response.Listener<String>(){
                    @Override
                    public void onResponse(String s) {
                        txt.setText(s);
                    }
                },new Response.ErrorListener(){
                    @Override
                    public void onErrorResponse(VolleyError volleyError) {
                        txt.setText("Some error occurred!!");
                    }
                });

                RequestQueue rQueue = Volley.newRequestQueue(MainActivity.this);
                rQueue.add(request);
            }
        });
    }
}

package com.androidvolleyexample;

import android.app.Activity;

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.StringRequest;

import com.android.volley.toolbox.Volley;

public class MainActivity extends Activity {

TextView txt;

Button btn;

String url ="https://www.thecrazyprogrammer.com/wp-content/uploads/demo.txt";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

txt = (TextView)findViewById(R.id.txt);

btn = (Button)findViewById(R.id.btn);

btn.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

StringRequest request = new StringRequest(Request.Method.GET, url, new Response.Listener<String>(){

@Override

public void onResponse(String s) {

txt.setText(s);

}

},new Response.ErrorListener(){

@Override

public void onErrorResponse(VolleyError volleyError) {

txt.setText("Some error occurred!!");

}

});

RequestQueue rQueue = Volley.newRequestQueue(MainActivity.this);

rQueue.add(request);

}

});

}

Screenshot

Fetching Image

ImageRequest class is used to create an image request. We specify the URL and then receive the bitmap in response. Below example shows how to do this.

Create an android project with package name com.androidvolleyexample and add following code in respective files.

activity_main.xml

<LinearLayout 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" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
    android:orientation="vertical">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:id="@+id/img"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btn"
        android:text="Fetch Data"/>

</LinearLayout>

<LinearLayout 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" android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"

android:orientation="vertical">

<ImageView

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginBottom="10dp"

android:id="@+id/img"/>

<Button

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:id="@+id/btn"

android:text="Fetch Data"/>

</LinearLayout>

MainActivity.xml

package com.androidvolleyexample;

import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

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


public class MainActivity extends Activity {
    ImageView img;
    Button btn;
    String url ="https://www.thecrazyprogrammer.com/wp-content/uploads/2015/07/The-Crazy-Programmer.png";

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

        img = (ImageView)findViewById(R.id.img);
        btn = (Button)findViewById(R.id.btn);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ImageRequest request = new ImageRequest(url, new Response.Listener<Bitmap>(){
                    @Override
                    public void onResponse(Bitmap b) {
                        img.setImageBitmap(b);
                    }
                }, 0, 0, null,

                new Response.ErrorListener(){
                    @Override
                    public void onErrorResponse(VolleyError volleyError) {
                        Toast.makeText(MainActivity.this, "Some error occurred!!", Toast.LENGTH_LONG).show();
                    }
                });

                RequestQueue rQueue = Volley.newRequestQueue(MainActivity.this);
                rQueue.add(request);
            }
        });
    }
}

package com.androidvolleyexample;

import android.app.Activity;

import android.graphics.Bitmap;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.Toast;

import com.android.volley.RequestQueue;

import com.android.volley.Response;

import com.android.volley.VolleyError;

import com.android.volley.toolbox.ImageRequest;

import com.android.volley.toolbox.Volley;

public class MainActivity extends Activity {

ImageView img;

Button btn;

String url ="https://www.thecrazyprogrammer.com/wp-content/uploads/2015/07/The-Crazy-Programmer.png";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

img = (ImageView)findViewById(R.id.img);

btn = (Button)findViewById(R.id.btn);

btn.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

ImageRequest request = new ImageRequest(url, new Response.Listener<Bitmap>(){

@Override

public void onResponse(Bitmap b) {

img.setImageBitmap(b);

}

}, 0, 0, null,

new Response.ErrorListener(){

@Override

public void onErrorResponse(VolleyError volleyError) {

Toast.makeText(MainActivity.this, "Some error occurred!!", Toast.LENGTH_LONG).show();

}

});

RequestQueue rQueue = Volley.newRequestQueue(MainActivity.this);

rQueue.add(request);

}

});

}

Screenshot

Fetching JSON Data

JsonObjectRequest and JsonArrayRequest class is used to create a json request. We specify the URL and then receive the json data in response. Same as string and image fetched above, we can fetch json data. So I am not giving its example as you can easily do yourself.

Sending Data

For sending some data we have to use post request and override getParams() method. The data is sent in key value pairs. It can be done in following way.

MainActivity.java

package com.androidvolleyexample;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.android.volley.AuthFailureError;
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.StringRequest;
import com.android.volley.toolbox.Volley;

import java.util.HashMap;
import java.util.Map;


public class MainActivity extends Activity {
    TextView txt;
    Button btn;
    String url ="http://192.168.1.8/JavaRESTfullWS/DemoService";

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

        txt = (TextView)findViewById(R.id.txt);
        btn = (Button)findViewById(R.id.btn);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                StringRequest request = new StringRequest(Request.Method.POST, url, new Response.Listener<String>(){
                    @Override
                    public void onResponse(String s) {
                        txt.setText(s);
                    }
                },new Response.ErrorListener(){
                    @Override
                    public void onErrorResponse(VolleyError volleyError) {
                        txt.setText("Some error occurred!!");
                    }
                })
                {
                    @Override
                    protected Map<String, String> getParams() throws AuthFailureError {
                        Map<String, String> parameters = new HashMap<String, String>();
                        parameters.put("message", "Hello");
                        return parameters;
                    }
                };

                RequestQueue rQueue = Volley.newRequestQueue(MainActivity.this);
                rQueue.add(request);
            }
        });
    }
}

package com.androidvolleyexample;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

import com.android.volley.AuthFailureError;

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.StringRequest;

import com.android.volley.toolbox.Volley;

import java.util.HashMap;

import java.util.Map;

public class MainActivity extends Activity {

TextView txt;

Button btn;

String url ="http://192.168.1.8/JavaRESTfullWS/DemoService";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

txt = (TextView)findViewById(R.id.txt);

btn = (Button)findViewById(R.id.btn);

btn.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

StringRequest request = new StringRequest(Request.Method.POST, url, new Response.Listener<String>(){

@Override

public void onResponse(String s) {

txt.setText(s);

}

},new Response.ErrorListener(){

@Override

public void onErrorResponse(VolleyError volleyError) {

txt.setText("Some error occurred!!");

}

})

{

@Override

protected Map<String, String> getParams() throws AuthFailureError {

Map<String, String> parameters = new HashMap<String, String>();

parameters.put("message", "Hello");

return parameters;

}

};

RequestQueue rQueue = Volley.newRequestQueue(MainActivity.this);

rQueue.add(request);

}

});

}

Comment below if you found anything incorrect or have doubts related to above android volley tutorial.

7 thoughts on “Android Volley Tutorial With Example”

Adel Rafiee
April 26, 2017 at 1:47 pm

Hi sir
your tutorial was great, thanks alot.
I’m new in android, i don’t know the role of this code snippet:

@Override
protected Map getParams() throws AuthFailureError {
Map parameters = new HashMap();
parameters.put(“message”, “Hello”);
return parameters;

Is there any tutorial or if u could explain more I will appriciate

1. Admin
  April 27, 2017 at 1:18 pm
  
  This getParams() method is used to send some parameters or values to server. Learn more about it here http://www.androidhive.info/2014/05/android-working-with-volley-library-1/
  
pooja
November 27, 2017 at 6:14 pm

Hey Hi…..
I am getting error while using volley. com.android volley.TimeoutError
kindly suggest what is the problem

1. Prashant
  February 9, 2018 at 8:55 am
  
  increase timeout of volley request
  
Ahmed
July 1, 2018 at 2:37 pm

You are admirably simple. Thank you Mr

Isha Mitta;
March 13, 2019 at 7:17 am

Saved Alot of time 🙂

hasanpour
November 11, 2022 at 11:58 am

Thanks a lot

Android Volley Tutorial

Pre-requisites

Fetching String Data

Fetching Image

Fetching JSON Data

Sending Data

Related Posts

7 thoughts on “Android Volley Tutorial With Example”

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