Android studio Java

A user can enter any number that will not exceed to 3 digits. a toast message displays this "The entry has exceeded the number of numbers allowed!"

Also, it should not accept any letters, space or special characters. Numbers only.

Use the convert button to get the desired output.

Note:

See the image below as your UI design guide

Temp Conversion by Anonas Type a number: 30 Celcius to Fahrenheit Fahrenheit to Celcius CONVERT Result: 86