Android com.android.support 版本不一致

Android 引入的第三方的包出现support版本冲突的问题：

All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes). Found versions 28.0.0, 27.1.0. Examples include com.android.support:animated-vector-drawable:28.0.0 and  com.android.support:exifinterface:27.1.0 Inspection info:There are some combinations of libraries, or tools and libraries, that are incompatible, or can lead to bugs. One such incompatibility is compiling with a version of the Android support libraries that is not the latest version (or in particular, a version lower than your targetSdkVersion).

我们可以这样处理：

    // picasso po    implementation('com.squareup.picasso:picasso:2.71828') {        exclude group: 'com.android.support'    }

Android gradle provided、implementation等指令注意点

注意compile是和api对应的，效果相同。
implementation 的区别在于对外可见性，而且可以加快编译速度（原理在于减少不必要的重复编译过程）

A module 依赖 B module，B 依赖 C module。Android Studio 2.X使用compile：A compile BB compile CA module不仅可以引用B module，还可以引用C module的接口和类。Android Studio 3.X使用implementation：A implementation BB implementation CA module只可以引用B module，不可以引用C module。C 对 A 是不可见的！

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