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Jeremy Walker
Jeremy Walker Removes incorrect comments from yaml files.
Change-Id: I16a3dec6ad9fcdd0128d015cebb2d026cafc00d4
Latest commit 72d3211 Aug 2, 2019

Android AlwaysOn Sample

A basic sample showing how to support ambient mode for native Wear apps.


WearableActivity offers methods for supporting your native app staying on the screen when the Wear device enters ambient mode.

This example extends WearableActivity and overrides onEnterAmbient, onUpdateAmbient, and onExitAmbient to allow the simple native Wear app to support ambient mode.

In ambient mode, this app follows best practices by keeping most pixels black, avoiding large blocks of white pixels, using only black and white, and disabling anti-aliasing (following the design guidelines for Watch Faces).

In addition and most importantly, the app sleeps while in ambient mode for 20 seconds between any updates to conserving battery life (processor allowed to sleep). If you can hold off on updates for a full minute, you can throw away the Handler and just use onUpdateAmbient to save even more battery life.

As always, you will still want to apply the performance guidelines outlined in the Watch Faces documention to your app.


  • Android SDK 28
  • Android Build Tools v28.0.3
  • Android Support Repository


Screenshot Screenshot Screenshot Screenshot

Getting Started

This sample uses the Gradle build system. To build this project, use the "gradlew build" command or use "Import Project" in Android Studio.


If you've found an error in this sample, please file an issue:

Patches are encouraged, and may be submitted by forking this project and submitting a pull request through GitHub. Please see for more details.

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