Today, after using the font library on GitHub, it is found that the control has not been recognized after the successful introduction:

Android-Iconics

introduce:

//Font library
implementation 'com.mikepenz:iconics-core:5.3.0@aar'
//this adds all ui view widgets (IconicsButton, IconicsImageView, ...)
implementation 'com.mikepenz:iconics-views:5.3.0'

After trying several ways, I found that the problem is that the kotlin version of Android studio is too low

My original plug-in version is 1.3.6. After updating to 1.4.10, I successfully referenced it