Just One Pure ITer
众所周知android提供了很多Support Library作为api的补充，常见的有supprt-v4，v7等，但我发现这些支持库的版本众多，涉及的内容也比较庞杂，本文带大家梳理一下常见的Support Library，然后文章后半部分对一个报错问题展开深究，那就是我们用开源库时经常碰到的v4重复依赖问题：DexException Multiple dex files define。 Android:你好,androidX.再见,android.support 按照官方文档说明 androidx 是对 android.support.xxx 包的整理后产物。由于之前的support包过于混乱，所以，google推出了 androidX。 由于在后续版本中，会逐步放弃对support 的升级和维护，所以，我们必须迁移到 androidX.
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