android studio在創建項目的時候，有個選項：Use legacy android.support libraries
這個選項就是使用v7包，如果不選擇的話應該是androidx。
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android.support和androidx包
Android:你好,androidX！再見,android.support
Version 28 (intended for Android Pie and below) is the last version of the legacy support library
Version 28 (intended for Android Pie and below) is the last version of the legacy support library.....Refactor > Migrate to AndroidX
Suggestion: use tools:overrideLibrary="android.support.v17.leanback" to force usage
Support for the experimental syntax 'decorators-legacy' isn't currently enabled (7:1):
Support for the experimental syntax 'decorators-legacy' isn't currently enabled
android support library下載
Android Support Library介紹
關於android support 升級為androidx