proguard.flags - platform/frameworks/opt/datetimepicker - Git at Google

 -keepclassmembers class com.android.datetimepicker.RadialSelectorView {
   *** setAnimationRadiusMultiplier(...);
 }

 -keepclassmembers class com.android.datetimepicker.RadialTextsView {
   *** setAnimationRadiusMultiplier(...);
 }
	-keepclassmembers class com.android.datetimepicker.RadialSelectorView {
	*** setAnimationRadiusMultiplier(...);
	}

	-keepclassmembers class com.android.datetimepicker.RadialTextsView {
	*** setAnimationRadiusMultiplier(...);
	}