1. 问题描述
旧项目改造时，引入implementation 'com.google.android.material:material:1.2.0-alpha02'时异常，报错如下：
Output: /Users/buqx/Geone_Project/SipSmartTravel/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:3334: error: style attribute 'android:attr/dialogCornerRadius' not found.
/Users/buqx/Geone_Project/SipSmartTravel/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values-v28/values-v28.xml:15: error: resource android:attr/dialogCornerRadius not found.
/Users/buqx/Geone_Project/SipSmartTravel/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values-v28/values-v28.xml:19: error: resource android:attr/dialogCornerRadius not found.
/Users/buqx/Geone_Project/SipSmartTravel/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:1003: error: resource android:attr/fontVariationSettings not found.
/Users/buqx/Geone_Project/SipSmartTravel/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:1003: error: resource android:attr/ttcIndex not found.
/Users/buqx/Geone_Project/SipSmartTravel/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:1218: error: resource android:attr/lineHeight not found.
/Users/buqx/Geone_Project/SipSmartTravel/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:1223: error: resource android:attr/lineHeight not found.
/Users/buqx/Geone_Project/SipSmartTravel/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:1472: error: resource android:attr/textFontWeight not found.
2. 原因
旧项目没有迁移到AndroidX。而我引入的版本是implementation 'com.google.android.material:material:1.2.0-alpha02' 。
3. 解决方法
将旧项目迁移至AndroidX或者引入support design，需要注意的是support包版本较低时，会缺少一些Material Design组件。
implementation 'com.android.support:design:28.0.0-alpha1'
