I saw Numberpicker as a tool to select a number from a range with minimum value of 0. I am looking for a range picker view to be able to select a range of values (instead of a value from a range) including negative values (for example (-100, +200)). Is there a pre-built solution for this?
There is no in-built solution for range picker, there are libraries out there which you can use to implement your requirement. For example see this library : https://github.com/oli107/material-range-bar