https://developer.android.google.cn/reference/android/support/v17/leanback/widget/ShadowOverlayHelper.Builder?authuser=0
ShadowOverlayHelper.Builder | API reference | Android Developers
builder apireferenceandroiddevelopers
https://developer.android.com/reference/androidx/leanback/widget/ShadowOverlayHelper.Options
ShadowOverlayHelper.Options | API reference | Android Developers
options apireferenceandroiddevelopers
https://developer.android.com/reference/android/support/v17/leanback/widget/ShadowOverlayHelper?authuser=5
ShadowOverlayHelper | API reference | Android Developers
api referenceandroiddevelopers