Causes a problem with rounding, which is that I was layout_width and layout_height in dp instead of using wrap_content .
The problem with the countdown animation is that you need to specify the width and color of the border.
EDIT: Here is an example of what I used (the app is defined under xmlns:android as xmlns:app="http://schemas.android.com/apk/res-auto" ):
<android.support.wearable.view.CircledImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/ic_action_call" app:circle_color="@color/green" app:circle_radius="30dp" app:circle_radius_pressed="40dp"/>
In terms of attributes, I use Intellij / AS, which automatically terminates them. If you are not using any of these IDEs, the attributes pretty much match the method names, so you can map them there.
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