这个是什么意思
Error:A problem occurred configuring project ':menudemo'. > Could not resolve all dependencies for configuration ':menudemo:_debugCompile'. > Could not find com.android.support.constraint:constraint-layout:1.0.0-alpha4. Searched in the following locations: file:/D:/ProgramFiles/Android/Android Studio/gradle/m2repository/com/android/support/constraint/constraint-layout/1.0.0-alpha4/constraint-layout-1.0.0-alpha4.pom file:/D:/ProgramFiles/Android/Android Studio/gradle/m2repository/com/android/support/constraint/constraint-layout/1.0.0-alpha4/constraint-layout-1.0.0-alpha4.jar https://jcenter.bintray.com/com/android/support/constraint/constraint-layout/1.0.0-alpha4/constraint-layout-1.0.0-alpha4.pom https://jcenter.bintray.com/com/android/support/constraint/constraint-layout/1.0.0-alpha4/constraint-layout-1.0.0-alpha4.jar file:/D:/ProgramFiles/Android/Android/sdk1/extras/android/m2repository/com/android/support/constraint/constraint-layout/1.0.0-alpha4/constraint-layout-1.0.0-alpha4.pom file:/D:/ProgramFiles/Android/Android/sdk1/extras/android/m2repository/com/android/support/constraint/constraint-layout/1.0.0-alpha4/constraint-layout-1.0.0-alpha4.jar file:/D:/ProgramFiles/Android/Android/sdk1/extras/google/m2repository/com/android/support/constraint/constraint-layout/1.0.0-alpha4/constraint-layout-1.0.0-alpha4.pom file:/D:/ProgramFiles/Android/Android/sdk1/extras/google/m2repository/com/android/support/constraint/constraint-layout/1.0.0-alpha4/constraint-layout-1.0.0-alpha4.jar Required by: HomeWork2:menudemo:unspecified
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Android Studio未安装ConstraintLayout的支持包，打开Sdk Manager，选中“SDK Tools”，在右下方勾选”how Package Details”。找到Support Repository选项卡中对应的选项，勾选安装即可~
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