Android Studio 2.2 Preview 5 发布，此版本包括了大量的bug修复。 Performance:
We fixed two big memory leaks -- one related to Gradle sync and the
other related to layout rendering; both should help significantly with
memory usage. We also improved the locking behavior of layout XML
preview so it shouldn't cause the editor to lag when typing during
background layout preview rendering. Instant Run: A number of important bug fixes which should help with performance and correctness: Fixed a bug where assets were not properly packaged Disable
the small optimization where edits in the main app module skip certain
tasks: this was not safe and could lead to some edits missing when
running the app Fix a bug which meant assets would not be incrementally packaged in alpha4 No longer crunch PNGs in library dependencies Fix bug where updating launcher icons would not trigger an app reinstall
Layout Editor: Auto connect mode is now off by default. New constraint layout library version alpha4. There's a lint warning (and quickfix to update) if you're using alpha3 or older. The focus of the update is on layout performance. There's also documentation on the various attributes, and code completion should work better with this version in the IDE Note: There is an incompatible change in the Guideline class and attributes: layout_constraintGuide_begin, layout_constraintGuide_end and layout_constraintGuide_Percent
The resize screen feature has been tweaked visually and should be much faster. The
screenshot action has been added back to the Context menu, and there is
a preference panel in options where you can set the "prefer XML editor
for layout files" option as in previous releases. Lint
icons no longer show up on the design surface by default, but you can
turn them back on via options (including from the lint notifications
panel.) PhotoShop file support: Layers in 16 bit and 32 bit images are now decoded Fixed many bugs, including the <include> bug starred by a bunch of users where on Windows, include tags would stop working
Other:
A lot of fixes across the product - in deployment, editor, data
binding, C++/CMake/NDK support, lint, Espresso test runner, Firebase,
etc. Updated platform metadata for Android Nougat (e.g.
code completion for context.getSystemService() should return all the
valid constants as of N, etc.) Fixes for the most common exceptions reported via the crash reporter
详情：Android Studio 2.2 Preview 5 Available | 
