问题
Everything was working fine inside studio, but then I get error:
Could not find com.android.support.constraint:constraint-layout:1.0.0-beta4.
Problem is that I can not install Constraint layout in Android Studio because I am using Ubuntu.I can not find SDK Tools(System Settings) to install manually like usually on MAC.
None of solutions here worked for me because they are mostly for MAC OS.
I am using Android 2.2 on Ubuntu 14.04, and Gradle 2.2.2.
回答1:
I am using Android 2.2
if you use preview 1 than try with
compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha1'
Gradle
classpath 'com.android.tools.build:gradle:2.2.0'
inside gradle wrapper
distributionUrl=https://services.gradle.org/distributions/gradle-2.14.1-all.zip
make sure you un-check from offline if you have not gradle 2.14.1
build Tools Version
buildToolsVersion ' 25 '
Best way if you have installed gradle 2.14.1-all then just go to your layout and then design tab, rignt click on your layout, click to convert,if you haven't installed Constraint lib you see a popup that says install lib, and click on ok. and then you can see in app level gradle file Constraint layout dependency added.
来源：https://stackoverflow.com/questions/40788918/could-not-find-constraint-layout-inside-android-studio