原文地址 http://fanjiajia.cn/2018/09/25/Android%20Studio%20Could%20not%20resolve%20com.android.support.constraint:constraint-layout:1.1.3./
打开Android Studio的设置,在Appearance & Behavior -> System Setting -> Android SDK下查看SDK Tools,这里注意勾选右下角的show package detail查看你安装的ConstraintLayout是什么版本。我这里是1.0.2,而查看我app的build.gradle中的配置,对没错就是1.1.3
Appearance & Behavior -> System Setting -> Android SDK
show package detail
ConstraintLayout
app
build.gradle
这就很好解决了,将这里改成1.0.2即可。