onProgressUpdate(): This is invoked on the UI thread and used for updating progress in the UI (such as filling up a progress bar). doInBackground(): This is where you implement the code to execute the work that is to be performed on the separate thread. onPreExecute(): This method runs on the UI thread, and is used for setting up your task (like showing a progress bar). An AsyncTask subclass has the following methods for performing work off the main thread: Therefore, all your networking code must belong to a background thread. The Android platform does not allow you to run network operations on the main thread of the application. Therefore, before you start writing any networking code, you must make sure that the following uses-permission tag is present in your project's manifest file: īecause is not considered a dangerous permission, you don't have to request for it during runtime on devices running API Level 23 or higher. However, Android applications can access the Internet only if they have the permission. Making use of a REST API obviously involves using the Internet. 
In this tutorial, I'm going to show you how to use the classes and methods available in the Android SDK to connect to remote web servers and interact with them using their REST APIs. (See our Beginner’s Guide to HTTP and REST for a primer.) That might sound hard, but with more and more websites exposing their resources through REST APIs, it's actually quite easy. Instead, you should consider building applications that can display fresh content every time the user opens them. Our attention spans too are shorter than ever, so building Android applications whose content is static can be a bad idea.
Most of us have developed voracious appetites for new information, what with the Internet being such an important part of our lives.
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