android.graphics.drawable
Interfaces 
Animatable
Drawable.Callback
Classes 
AnimationDrawable
BitmapDrawable
ClipDrawable
ColorDrawable
Drawable
Drawable.ConstantState
DrawableContainer
DrawableContainer.DrawableContainerState
GradientDrawable
InsetDrawable
LayerDrawable
LevelListDrawable
NinePatchDrawable
PaintDrawable
PictureDrawable
RotateDrawable
ScaleDrawable
ShapeDrawable
ShapeDrawable.ShaderFactory
StateListDrawable
TransitionDrawable
Enums 
GradientDrawable.Orientation