To solve the issue of the navigation bar performing in the back of the ScrollView to your Android format, you need to make certain that the BottomNavigationView is positioned efficaciously in the layout hierarchy. In your current setup, the ScrollView is about to match_parent, which could reason it to overlap with the navigation bar.

You can restoration this with the aid of adjusting the format parameters of the ScrollView to ensure it does now not occupy the entire display height. Here’s how you could adjust your activity_main.Xml:

<ScrollView

android:layout_width="match_parent"

android:layout_height="0dp"

android:layout_weight="1"

android:padding="16dp"

android:layout_above="@identity/bottomNavigationView">

This alternate will allow the ScrollView to take up the to be had area above the BottomNavigationView, preventing overlap. Additionally, make sure that the BottomNavigationView is defined after the ScrollView inside the XML record to keep the precise rendering order.

If your Constraint Widget for the BottomNavigationView has disappeared, you can need to re-add it inside the format editor or ensure that you are the use of the appropriate format type (e.G., ConstraintLayout) that supports constraints.

By making those adjustments, your navigation bar have to display effectively above the ScrollView.