Error:Unable to resolve dependency for ':app@debug/compileClasspath': Could not download okhttp.jar (com.squareup.okhttp3:okhttp:3.9.0)
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解决方案：在整个工程的build.gradle中添加以下框内框内代码：
为了大家复制方便直接贴下添加的代码：
allprojects{
repositories{
jcenter()
maven {
url"https://jitpack.io"
}
}
}
后来在app下的build.gradle android{}中添加：
aaptOptions{cruncherEnabled =false
useNewCruncher =false}
ok了
