Flutter TextInputType.number is not forcing a number only keyboard

Question

I don't understand what I'm missing here. I put TextInputType to number, and can still type any letter, special character and even an emoji. I have also tried making the child a TextInputType.numberWithOptions() widget, and it opens the same keyboard. Is this just a bug on my phone? P20 Pro

      Row(
          children: <Widget>[
            Text('TextInputType.number:'),
            Flexible(
                child: TextField(
              maxLength: 3,
              keyboardType: TextInputType.number,
            )),
          ],
        )

Answer 1

To Only Enable Numbers - You need to add - inputFormatters: also adding - keyboardType: won't help standalone.

Code:

TextField(
          maxLength: 3,
          inputFormatters: <TextInputFormatter>[
            WhitelistingTextInputFormatter.digitsOnly,
          ],
          keyboardType: TextInputType.number,
        ),

Answer 2

The approach above in anmol.majhail's answer is deprecated as of Flutter 2.0. Flutter recommends a shift from WhitelistingTextInputFormatter.* to FilteringTextInputFormatter.*. As such, in order to achieve the same effect in a Flutter 2.0 app follow the example in the code excerpt below.

TextField(
  maxLength: 3,
  inputFormatters: <TextInputFormatter>[
    FilteringTextInputFormatter.digitsOnly,
  ],
  keyboardType: TextInputType.number,
),

Answer 3

TextFormField(

                       keyboardType: TextInputType.number,
                       inputFormatters:  <TextInputFormatter> [
                        FilteringTextInputFormatter.allow(RegExp(r'[0-9]')),
                        FilteringTextInputFormatter.digitsOnly,                          
                        ],
                       decoration: const InputDecoration(contentPadding: EdgeInsets.all(5),
                       labelText: "TextInputType.number:", prefixIcon: Icon(Icons.wallet),
                       ),
                       maxLength: 10,
                       
                      ),

Answer 4

Use this as older one is Depressed

maxLength: 10,
inputFormatters: [
   // only accept letters from 0 to 9
   FilteringTextInputFormatter(RegExp(r'[0-9]'), allow: true)
   // Using for Text Only ==>    (RegExp(r'[a-zA-Z]'))
],
keyboardType: TextInputType.number,

Answer 5

If you use FocusNode then delete it. Now it's working fine.