This project is just a very bare-bones example of a custom watchface running on Android wear. I have not tested this on a device, only in the emulator. This should be enough to get you off the ground for now, I will be updating in the future with more examples hopefully.

• This is not perfect.
• This is completely un-official.
• I am not responsible for any damage this may cause to your device.

To get an Android Activity running as a watch-face is VERY simple. Simply add some extra meta-data as well as intents to your Manifest.

This is simple enough, in the activity tag you just need to make sure you add

android:allowEmbedded="true" 

This allows the main "launcher" to embed your activity as a background.

<meta-data android:name="com.google.android.clockwork.home.preview" android:resource="@drawable/preview" />

The resource points to a drawable that is the preview image for your watch-face. This image should be 320x320px or 120x120dp.

Add this inside your activity tag. Example Here

<intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="com.google.android.clockwork.home.category.HOME_BACKGROUND" />
</intent-filter>

These allow the system to know that your application will be capable of displaying an activity as a background. Simply add that code snippet inside of your Activity tag and the system will know. Example Here