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 1

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.

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

 

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

 

MainActivity.xml

 

Screenshot

Android Volley Tutorial 3

 

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

 

MainActivity.xml

 

Screenshot

Android Volley Tutorial 2

 

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

 

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

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