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ExtensionInterface Main Extension interface definition that will be used by the WindowManager library to get custom OEM-provided information that isn't covered by platform APIs. 
ExtensionInterface.ExtensionCallback Callback that will be registered with the WindowManager library, and that the extension should use to report all state changes. 


ExtensionDeviceState Information about the current state of the device. 
ExtensionDisplayFeature Description of a physical feature on the display. 
ExtensionProvider A stub implementation for the class that will instantiate the Extension. 
ExtensionWindowLayoutInfo Contains information about the layout of display features within the window.