Android Error:Could not find commons-codec.jar (commons-codec:commons-codec:1.6)

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升级了Android studio 3.0+出现了：

Error:Could not find commons-codec.jar (commons-codec:commons-codec:1.6).
Searched in the following locations:
    file:/C:/Program Files/Android Studio/gradle/m2repository/commons-codec/commons-codec/1.6/commons-codec-1.6.jar

路径下少了commons-codec-1.6.jar（下载） jar包功能用于加密，参考：

总结：commons-codec.jar中常用方法

再出现了：

Failed to resolve: com.android.support:support-v4:27.1.0 Show in File Show in Project Structure dialog
Failed to resolve: com.android.support:appcompat-v7:27.1.0 Show in File Show in Project Structure dialog
Failed to resolve: com.android.support:recyclerview-v7:27.1.0 Show in File Show in Project Structure dialog

Failed to resolve: com.android.support:multidex:1.0.3 Show in File Show in Project Structure dialog

解决：

原来工程根 build.gradle里配置：

buildscript {
    repositories {
        jcenter()
        flatDir { dirs 'libs' }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
    }
}
repositories {
    google()
}

改为： 

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buildscript {

    allprojects {

        repositories {
            flatDir { dirs 'libs' }
            jcenter()
            google()
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
    }
}
repositories {
    google()
}

还不行可以参考：http://blog.csdn.net/rrkdddd33/article/details/79236367