build-android-start/app/src/main/java/com/google/firebase/codelab/friendlychat/FriendlyMessageAdapter.kt
build-android/app/src/main/java/com/google/firebase/codelab/friendlychat/FriendlyMessageAdapter.kt

build-android-start/app/src/main/java/com/google/firebase/codelab/friendlychat/MyScrollToBottomObserver.kt
build-android/app/src/main/java/com/google/firebase/codelab/friendlychat/MyScrollToBottomObserver.kt

build-android-start/app/src/main/java/com/google/firebase/codelab/friendlychat/MyButtonObserver.kt
build-android/app/src/main/java/com/google/firebase/codelab/friendlychat/MyButtonObserver.kt

build-android-start/app/src/main/java/com/google/firebase/codelab/friendlychat/MainActivity.kt
build-android/app/src/main/java/com/google/firebase/codelab/friendlychat/MainActivity.kt

build-android-start/app/src/main/java/com/google/firebase/codelab/friendlychat/SignInActivity.kt
build-android/app/src/main/java/com/google/firebase/codelab/friendlychat/SignInActivity.kt

build-android-start/app/src/main/java/com/google/firebase/codelab/friendlychat/MyOpenDocumentContract.kt
build-android/app/src/main/java/com/google/firebase/codelab/friendlychat/MyOpenDocumentContract.kt