Android S10E2 : Handler - Update ProgressBar From Thread

Android Handler Tutorial and Example. How to update a progressbar from background thread using Handler class.

SOURCE CODE REFERENCE : http://camposha.info/android/handler-progressbar

In this tutorial we see how to attach a handler to a thread and use the handler to update a progressbar while simulating an intensive tatsk.

This is an android tutorial. We aim to look at the Handler class. This is a very important class defined in the `android.os` package. I have covered Handler in depth with many examples here: http://camposha.info/android/handler. However in this tutorial we look at how to use Handler's post() method to post updates to the user interface. Thus we are able to update the user interface from a background thread. Meanwhile we do the work in the background thread such that the UI thread remains responsive. In this tutorial we are specifically updating a progressbar as we simulate doing work in the background thread.

Here are important links:

VIDEO TUTORIAL : https://youtu.be/zzcRx6wuat8

SOURCE CODE REFERENCE : http://camposha.info/android/handler-...

HANDLER TUTORIAL : http://camposha.info/android/handler

THREAD TUTORIAL : http://camposha.info/android/threading

What is a Handler?

A Handler allows you to send and process Message and Runnable objects associated with a thread's MessageQueue. Each Handler instance is associated with a single thread and that thread's message queue. When you create a new Handler, it is bound to the thread / message queue of the thread that is creating it -- from that point on, it will deliver messages and runnables to that message queue and execute them as they come out of the message queue.

Let's start.