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

SOURCE CODE REFERENCE :

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: 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 :

SOURCE CODE REFERENCE :

HANDLER TUTORIAL :

THREAD TUTORIAL :

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.

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