Minimal example of bottom navigation view

Activity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        BottomNavigationView navigationView = findViewById(R.id.navView);
        loadFragment(new RouletteFragment());
        navigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                switch (item.getItemId()){
                    case R.id.nav_coin:
                        loadFragment(new CoinFragment());
                        return true;

                    case R.id.nav_dice:
                        loadFragment(new DiceFragment());
                        return true;

                    default:
                        loadFragment(new RouletteFragment());
                        return true;
                }
            }
        });
    }

    private void loadFragment(Fragment fragment) {
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        ft.replace(R.id.container, fragment);
        ft.commit();
    }
}

layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <FrameLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"/>

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/navView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#fff"
        app:menu="@menu/menu"/>

</LinearLayout>

menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/nav_roulette"
        android:title="@string/nav_roulette_str"
        android:icon="@drawable/ic_wheel"/>

    <item
        android:id="@+id/nav_coin"
        android:title="@string/nav_coin_str"
        android:icon="@drawable/ic_coin"/>

    <item
        android:id="@+id/nav_dice"
        android:title="@string/nav_dice_str"
        android:icon="@drawable/ic_dice"/>

</menu>