Skip to content

Most visited

Recently visited


Sending Operations to Multiple Threads

Dependencies and prerequisites

You should also read

Try it out

Download the sample

The speed and efficiency of a long-running, data-intensive operation often improves when you split it into smaller operations running on multiple threads. On a device that has a CPU with multiple processors (cores), the system can run the threads in parallel, rather than making each sub-operation wait for a chance to run. For example, decoding multiple image files in order to display them on a thumbnail screen runs substantially faster when you do each decode on a separate thread.

This class shows you how to set up and use multiple threads in an Android app, using a thread pool object. You'll also learn how to define code to run on a thread and how to communicate between one of these threads and the UI thread.


Specifying the Code to Run on a Thread
Learn how to write code to run on a separate Thread, by defining a class that implements the Runnable interface.
Creating a Manager for Multiple Threads
Learn how to create an object that manages a pool of Thread objects and a queue of Runnable objects. This object is called a ThreadPoolExecutor.
Running Code on a Thread Pool Thread
Learn how to run a Runnable on a thread from the thread pool.
Communicating with the UI Thread
Learn how to communicate from a thread in the thread pool to the UI thread.
This site uses cookies to store your preferences for site-specific language and display options.

Get the latest Android developer news and tips that will help you find success on Google Play.

* Required Fields


Ikuti Google Developers di WeChat

Browse this site in ?

You requested a page in , but your language preference for this site is .

Would you like to change your language preference and browse this site in ? If you want to change your language preference later, use the language menu at the bottom of each page.

This class requires API level or higher

This doc is hidden because your selected API level for the documentation is . You can change the documentation API level with the selector above the left navigation.

For more information about specifying the API level your app requires, read Supporting Different Platform Versions.

Take a short survey?
Help us improve the Android developer experience. (Dec 2017 Android Platform & Tools Survey)