Username Availability Check Android Application using Java RESTful Webservice

In this post, I will be discussing on how to create Android application to check if the username typed by user is available to choose or not.

When it comes to Username availability check, I always remember Google registration page where it checks for the username availability once you finished typing username and moved to next form control and also it updates the User whether the Username is available to pick or not.

I tried to register with username that already exists, I just captured the screen-print of it.

Take a look at it below:

Google_Username_Availability_Check

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Android Restful Webservice Tutorial – How to call RESTful webservice in Android – Part 3

In the Android RESTful tutorial series , I am discussing about creating and invoking RESTful webservice in Android applications.

In this particular post, I am going to discuss about how to invoke RESTful webservice (that has been created and deployed in local application server) from inside Android applications.

I already discussed about What is RESTful webservice and how to create it in couple of posts earlier. Have listed those posts links below, it would be helpful for you if you quickly take a look at those articles.

If you are new to RESTful webservice, I would recommend you to take a look at Introduction to RESTful webservice

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Android Restful Webservice Tutorial – How to create RESTful webservice in Java – Part 2

In the Android RESTFul tutorial series , I am discussing about creating and invoking RESTful webservice in Android applications.

In this particular post, I am going to discuss about how to create RESTful webservice using Java.

If you are new to RESTful webservice, I would recommend you to take a look at Introduction to RESTful webservice

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Android Restful Webservice Tutorial – Introduction to RESTful webservice – Part 1

The most buzzing questions among Android developers are:

  1. How to call webservice in Android applications that has been created using Java or Dot Net?
  2. How to invoke RESTful webservice in Android applications?
  3. How to call SOAP webservice in Android applications?

Here in Android Tutorial Blog, we have already discussed lot about using Webservice in Android applications. Take a look at Android Webservice Tutorial to know list of articles we wrote on webservice.

Integrating Android application and Webservice is not that much difficult. We can make it work if we know basics of webservice and the procedure to make webservice call from inside Android applications.

In this post, I will be discussing about creating and invoking RESTful webservice in Android applications.

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Android Webservice Tutorial

In this post, I will walk you through the importance of using Web Service in Android applications.

Quick Links

  1. What is Web Service?
  2. Why Web Service?
  3. What is the need of using Web Service in Android applications?
  4. Android Web Service Tutorials

What is Web Service?

A web service is a standard used for exchanging information between applications or systems of heterogeneous type. Software applications written in various programming languages and running on various platforms can use web services to exchange information over Internet using http protocol.

This inter-operability can be achieved between Java and Dot net applications, or PHP and Java applications.

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Android Dot Net Web Service Login

In this post, I am going to discuss about how to authenticate Users in Android application using Dot Net Web service.The application which I am gonna create will have two screens – Login screen and Home screen.

User has to type his/her credentials and click ‘Login’ button. Once ‘Login’ button is clicked, application fires call to Dot Net web service along with Username and Password typed by User. Our Activity waits for response from the web service, once it receives response, it decides whether to take User to next screen(Home) or show ‘Login Failed’ message based on the response.

Here is the graphical representation of whatever we discussed:

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