Android and Hilt sample Kotlin ViewModel DI with Hilt Fragment Navigation and Multiple Fragments Retrofit and moshi https://ntp-a1.nict.go.jp/cgi-bin/json Camera Room Test ViewModel and LiveData https://developer.android.com/codelabs/advanced-android-kotlin-training-testing-basics#7 https://developer.android.com/codelabs/advanced-android-kotlin-training-testing-basics#8 ViewBinding upload photo add a test if the retrofit2 interface being buildable