Implement APIs for obtaining, caching themed Drawables
When Drawables are inflated during preload (or otherwise without a theme)
they cache their themeable attributes in their constant state as an array
keyed on attribute index. Drawables inflated with a theme will simply
resolve theme attributes as part of normal inflation, and they will not
cache any themeable attributes.
Drawables obtained from Resources are pulled from theme-specific cache
when possible. If an unthemed Drawable exists in the preload cache, a
new constant state will be obtained for the Drawable and the theme will
be applied by resolving the cached themeable attributes and overwriting
their respective constant state properties. If no cached version exists,
a new Drawable is inflated against the desired theme.
Constant states from themed drawables may be cached if the applied theme
is "pure" and was loaded from a style resource without any subsequent
modifications.
This CL does not handle applying themes to several Drawable types, but it
fully supports BitmapDrawable, GradientDrawable, NinePatchDrawable,
ColorDrawable, and TouchFeedbackDrawable.
BUG: 12611005
Change-Id: I4e794fbb62f7a371715f4ebdf946ee5f9a5ad1c9
27 files changed