Allow only two decimal number in flutter input?

Question

I want only two digits after the decimal point in the flutter input.User can't add more than two digits after the decimal point.

Answer 1

Here you go! Hope it helps :)

import 'package:flutter/material.dart'; import 'package:flutter/services.dart';  import 'dart:math' as math;  void main() {   runApp(new MaterialApp(home: new MyApp())); }  class MyApp extends StatefulWidget {   @override   _MyAppState createState() => _MyAppState(); }  class _MyAppState extends State<MyApp> {   @override   Widget build(BuildContext context) {     return Scaffold(       appBar: AppBar(         title: Text("Flutter"),       ),       body: Form(         child: ListView(           children: <Widget>[             TextFormField(               inputFormatters: [DecimalTextInputFormatter(decimalRange: 2)],               keyboardType: TextInputType.numberWithOptions(decimal: true),             )           ],         ),       ),     );   } }  class DecimalTextInputFormatter extends TextInputFormatter {   DecimalTextInputFormatter({this.decimalRange})       : assert(decimalRange == null || decimalRange > 0);    final int decimalRange;    @override   TextEditingValue formatEditUpdate(     TextEditingValue oldValue, // unused.     TextEditingValue newValue,   ) {     TextSelection newSelection = newValue.selection;     String truncated = newValue.text;      if (decimalRange != null) {       String value = newValue.text;        if (value.contains(".") &&           value.substring(value.indexOf(".") + 1).length > decimalRange) {         truncated = oldValue.text;         newSelection = oldValue.selection;       } else if (value == ".") {         truncated = "0.";          newSelection = newValue.selection.copyWith(           baseOffset: math.min(truncated.length, truncated.length + 1),           extentOffset: math.min(truncated.length, truncated.length + 1),         );       }        return TextEditingValue(         text: truncated,         selection: newSelection,         composing: TextRange.empty,       );     }     return newValue;   } }