Android Studio 2.2 Preview 2 发布了。 主要改进记录如下： ConstraintLayout: version 1.0.0-alpha2 Fixed guidelines crash on device Fixed typo in attribute name (leftToLeft) Changed orientation attribute namespace from app to android to fix a conflict with GridLayout ConstraintLayout now works properly inside ScrollView ConstraintLayout now works properly inside RecyclerView Percentage positioning of guidelines is now parsed as an integer instead of a dimension Better behavior for match_parent on the device. The behavior is now the same as 0dp (the widget stretches according to its constraints) Layout Editor Fixed bug which sometimes turned fonts blue in other editors (.xml, .java) Fewer generated XML attributes Better behavior for match_parent in the editor Fixed widgets resizing during drag Improved guidelines representation in the editor Improved auto conversion to ConstraintLayout Improved edition of nested layouts Various bug fixes and improvements in the editor Fixed bug preventing the IDE from starting on some Linux distributions (in particular where /bin/sh is not bash) Export Signed APK wizard was exporting to the wrong folder (issue 210520) Fixed bug in welcome screen which meant some users couldn't create new projects Fixed embedded JDK handling Fixed a bug bugs in the native/hybrid debugger Disabled a couple of Groovy inspections that reported incorrect errors in build.gradle files Fixed an instant run bug which for some users resulted in every run turning into a full build Fixed a couple of crashes in lint (in the new Gradle plugin, 2.2 alpha 2) A bunch of improvements to the accessibility support 下载地址：https://sites.google.com/a/android.com/tools/download/studio/builds/2-2-preview-2 Android Studio 2.2 Preview 2 发布下载地址
