BottomNavigationView

bottommenu.xml

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

    <item
        android:id="@+id/home"
        android:icon="@drawable/home"
        android:title="home" />

    <item
        android:id="@+id/settings"
        android:icon="@drawable/settings"
        android:title="settings" />

    <item
        android:id="@+id/about"
        android:icon="@drawable/info"
        android:title="about" />

</menu>

 XML

<com.google.android.material.bottomnavigation.BottomNavigationView
    android:id="@+id/bottomNavigationView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:layout_constraintBottom_toBottomOf="parent"
    app:menu="@menu/bottommenu"/>

JAVA

bottomNavigationView.setOnItemSelectedListener(new NavigationBarView.OnItemSelectedListener() {
    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {

        int id = item.getItemId();
        if (id == R.id.home) {
            Toast.makeText(BottomNavigationActivity.this, "Home", Toast.LENGTH_SHORT).show();
        } else if (id == R.id.settings) {
            Toast.makeText(BottomNavigationActivity.this, "Settings", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(BottomNavigationActivity.this, "About", Toast.LENGTH_SHORT).show();
        }
        return true;
    }
});

OUTPUT