This application is example of how to use BottomNavigationView.

• This app is implemented in Kotlin
• Disable BottomNavigationView shift mode.
  

• Android SDK 28
• Android Build Tool 28.0.3
• Androidx 1.0.0
• Android Plugin for Gradle 3.4.1
• Kotlin gradle plugin 1.3.21

Build with Android Studio 3.4

    <android.support.design.widget.BottomNavigationView
        ・・・
        app:labelVisibilityMode="labeled"
        ・・・
    />

Use the extension of BottomNavigationView.

bottomNavigationView.disableShiftMode()

You need to configure proguard-rules.pro file if you want use ProGuard. Such as below:

-keepclassmembers class android.support.design.internal.BottomNavigationMenuView { 
    boolean mShiftingMode; 
}