'Android button position fixed to bottom until scroll to its parent layout position

I want to add a button to my layout which is fixed to bottom in the screen until user scroll and come to its proper location in the parent layout.

Here the button stayed in the bottom while scrolling

Here the button stayed in the bottom while scrolling

when user scroll to come to its actual position in its parent layout then it viewed in its actual position, and remain here till scroll to end

when user scroll to come to its actual position in its parent layout then it viewed in its actual position, and remain here till scroll to end

This feature should follow while the user scrolls up and exceed the button position.

How can I achieve this?

androidxmlandroid-layout


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