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kotlinlang

Hey, I want to restrict *zero* at the beginning of text input when the user type. So How it would be possible to restrict to enter zero at the be beginning, but the user can enter in the middle of the text.
*For example*
Not enter Zero at beginning
```0111 user will not allow displaying in edit text. only 111 is allowed```
Allow zero at middle
```1101 it can allow zero in middle.```


Try using a custom input filter inside which you can check if the entered string contains zero at start or not and prevent entering it

This isn’t Kotlin related, but `EditText` can have `onTextChanged` listeners attached to it. I’d use that along with `String.first() == '0'` to solve your problem.

it can be trickier: what if the user enters 100, then deletes the 1

but yeah, just use existing Android APIs, nothing Kotlin specific about them

true that, `onFocusChangeListener` might be better