tree 3ef7369c91bd51fae75769c23ebfb71e04d3989c
parent 852472d9aa39eb4591eac43487ac3e0944e1daf6
author Alan Viverette <alanv@google.com> 1395709226 -0700
committer Alan Viverette <alanv@google.com> 1395709226 -0700

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