In addition to the standard attributes listed above, it is also possible to specify a range of custom attributes (declared using CustomAttribute). In fact, just about any property available on the view type can be specified as a custom attribute for inclusion in an animation. To identify the name of the attribute, find the getter/setter name from the documentation for the target view class, remove the get/set prefix and lower the case of the first remaining character. For example, to change the background color of a Button view in code, we might call the setBackgroundColor() setter method as follows:
myButton.setBackgroundColor(Color.RED)
When setting this attribute in a constraint set or key frame, the attribute name will be backgroundColor. In addition to the attribute name, the value must also be declared using the appropriate type from the following list of options:
•motion:customBoolean - Boolean attribute values.
•motion:customColorValue...
