Problem :
Error:Could not find com.android.support.constraint:constraint-layout:1.0.0-alpha2. Required by: myapp:app:unspecified
Background : Android Studio 2.2 P 1
Support libraries for ConstraintLayout could not be installed/updated.
ConstraintLayout
Just open Preferences > Appearance & Behavior > System Settings > Android and move to SDK Tools tab. Check the following fields and install.
Preferences
Appearance & Behavior
System Settings
Android
SDK Tools
1.4m articles
1.4m replys
5 comments
56.9k users