Set unchangeable some part of editText android

Question

I have some EditText for mobile number input. App must add unique text for every country. For example for Armenia is must add +374 , and user must fill other nu

Answer 1

Use Text watcher and when user enters +3 it completes with +374 and it compares the first four characters and if it is same disable the back press of the softkeyboard so that it will not change the text and enters the other digit which append for the text used from the textwatcher