Mobile secure keyboard to prevent KeyLogger attack and screen capture

flutter_secure_keyboard

Mobile secure keyboard to prevent KeyLogger attack and screen capture.

Screenshots

Alphanumeric	Numeric

Getting started

To use this plugin, add flutter_secure_keyboard as a dependency in your pubspec.yaml file. For example:

dependencies:
  flutter_secure_keyboard: ^1.0.1+3

Examples

class WithSecureKeyboardExample extends StatefulWidget {
  @override
  _WithSecureKeyboardExampleState createState() => _WithSecureKeyboardExampleState();
}

class _WithSecureKeyboardExampleState extends State<WithSecureKeyboardExample> {
  final secureKeyboardController = SecureKeyboardController();

  final passwordEditor = TextEditingController();
  final passwordTextFieldFocusNode = FocusNode();

  final pinCodeEditor = TextEditingController();
  final pinCodeTextFieldFocusNode = FocusNode();

  @override
  Widget build(BuildContext context) {
    return WithSecureKeyboard(
      controller: secureKeyboardController,
      child: Scaffold(
        appBar: AppBar(title: Text('with_secure_keyboard_example')),
        body: _buildContentView()
      ),
    );
  }

  Widget _buildContentView() {
    // We recommend using the ListView widget to prevent widget overflows.
    return ListView(
      padding: const EdgeInsets.all(8.0),
      children: [
        Padding(
          padding: const EdgeInsets.only(bottom: 12.0),
          child: _buildPasswordTextField()
        ),
        _buildPinCodeTextField()
      ],
    );
  }

  Widget _buildPasswordTextField() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text('Password'),
        TextFormField(
          controller: passwordEditor,
          focusNode: passwordTextFieldFocusNode,
          // We recommended to set false to prevent the soft keyboard from opening.
          enableInteractiveSelection: false,
          obscureText: true,
          onTap: () {
            secureKeyboardController.show(
              type: SecureKeyboardType.Alphanumeric,
              textFieldFocusNode: passwordTextFieldFocusNode,
              initText: passwordEditor.text,
              hintText: 'password',
              onConfirmKeyPressed: (List<int> charCodes) {
                passwordEditor.text = String.fromCharCodes(charCodes);
              }
            );
          },
        ),
      ],
    );
  }

  Widget _buildPinCodeTextField() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text('PinCode'),
        TextFormField(
          controller: pinCodeEditor,
          focusNode: pinCodeTextFieldFocusNode,
          // We recommended to set false to prevent the soft keyboard from opening.
          enableInteractiveSelection: false,
          obscureText: true,
          onTap: () {
            secureKeyboardController.show(
              type: SecureKeyboardType.Numeric,
              textFieldFocusNode: pinCodeTextFieldFocusNode,
              initText: pinCodeEditor.text,
              hintText: 'pinCode',
              onConfirmKeyPressed: (List<int> charCodes) {
                pinCodeEditor.text = String.fromCharCodes(charCodes);
              }
            );
          },
        ),
      ],
    );
  }
}

WithSecureKeyboard

Parameter	Description
controller*	Controller for controlling the secure keyboard.
child*	A widget to have a secure keyboard.
keyboardHeight	Parameters to set the keyboard height.
backgroundColor	Parameters to set the keyboard background color.
stringKeyColor	Parameters to set keyboard string key(alphanumeric, numeric..) color.
actionKeyColor	Parameters to set keyboard action key(shift, backspace, clear..) color.
confirmKeyColor	Parameters to set keyboard confirm key color.
keyTextStyle	Parameters to set keyboard key text style.
inputTextStyle	Parameters to set keyboard input text style.

SecureKeyboardController

Function	Description
isShowing	Whether the secure keyboard is open.
type	Indicates the secure keyboard type.
show	Show a secure keyboard.
hide	Hide a secure keyboard.

SecureKeyboardController.show()

Parameter	Description
type*	Specifies the secure keyboard type.
textFieldFocusNode	The FocusNode that will receive focus on.
initText	Sets the initial value of the input text.
hintText	The hint text to display when the input text is empty.
inputTextLengthSymbol	Sets the symbol to use when displaying the input text length.
confirmKeyText	Sets the confirm key text.
clearKeyText	Sets the clear key text.
obscuringCharacter	Sets the secure character to hide the input text.
maxLength	Sets the maximum length of text that can be entered.
alwaysCaps	Whether to always display uppercase characters.
obscureText	Whether to hide input text as secure characters.
onKeyPressed	Called when the key is pressed.
onCharCodesChanged	Called when the character codes changed.
onConfirmKeyPressed*	Called when the confirm key is pressed.
onCloseKeyPressed	Called when the close key is pressed.

GitHub

https://github.com/Dev-hwang/flutter_secure_keyboard