1 编译报错 android:attr/ttcIndex & android:attr/fontVariationSettings not found 

解决：升级 compile sdk 和 target sdk 到28即可

2 

解决，将support 和 design 库的版本和compile sdk一致即可

implementation 'com.android.support:support-v4:28.0.0'

implementation 'com.android.support:design:28.0.0'