Show a text field dialog without being covered by keyboard?

Question

I'm trying to create a SimpleDialog that allows the user to enter their name. But when it is displayed the dialog is half hidden by the on-screen keyboard:

How can I get the Dialog to be fully visible?

Edit: I find it strange that the homepage widget (FocusVisibilityDemo) recognises the reduced height and therefore adjusts the position of the 'Push Me' button to remain in the center. Unfortunately the dialog doesn't behave the same way.

Here is my code:

import 'package:flutter/material.dart';

class FocusVisibilityDemo extends StatefulWidget {
  @override
  _FocusVisibilityDemoState createState() => new _FocusVisibilityDemoState();
}

class _FocusVisibilityDemoState extends State<FocusVisibilityDemo> {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(title: new Text('Text Dialog Demo')),
      body: new Center(
        child: new RaisedButton(
          onPressed: _showDialog,
          child: new Text("Push Me"),
        ),
      ),
    );
  }

  _showDialog() async {
    await showDialog<String>(
      context: context,
      child: new AlertDialog(
        contentPadding: const EdgeInsets.all(16.0),
        content: new Row(
          children: <Widget>[
            new Expanded(
              child: new TextField(
                autofocus: true,
                decoration: new InputDecoration(
                    labelText: 'Full Name', hintText: 'eg. John Smith'),
              ),
            )
          ],
        ),
        actions: <Widget>[
          new FlatButton(
              child: const Text('CANCEL'),
              onPressed: () {
                Navigator.pop(context);
              }),
          new FlatButton(
              child: const Text('OPEN'),
              onPressed: () {
                Navigator.pop(context);
              })
        ],
      ),
    );
  }
}

void main() {
  runApp(new MaterialApp(home: new FocusVisibilityDemo()));
}

Answer 1

If your use case is to add multiple TextFields inside your Dialog so your main Form does not get crowded, I think it is better if you build something more customizable than AlertDialog and SimpleDialog as they are used for simple activities (confirmations, radios..etc).

Otherwise, why do you want to use a Dialog for a single TextField ?

When we add multiple TextFields we should be careful about our design choices since other people will interact with this view to fill in the data, in this case I prefer to use fullscreenDialog property of PageRoute class. I am not sure if SimpleDialog can be suitable for that in Flutter.

Here is a quick example on how to use a FullScreenDialog, I hope this help and you should be able to modify it the way you want:

import 'package:flutter/material.dart';


void main() {
  runApp(new MaterialApp(home: new MyApp(),));
}

class MyApp extends StatefulWidget {
  @override
  MyAppState createState() => new MyAppState();
}

class MyAppState extends State<MyApp> {
  FullScreenDialog _myDialog = new FullScreenDialog();

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
        appBar: new AppBar(
          title: new Text("Fill this form"),
        ),
        body: new Column(
          children: <Widget>[
            new TextField(controller: new TextEditingController(
                text: "Add a single text field"),),

            new Card(child: new ListTile(
              title: new Text("Click to add your top 3 amazing skills"),
              subtitle: new Text(
                  "${_myDialog._skillOne} ${_myDialog._skillTwo} ${_myDialog
                      ._skillThree}"),
              onTap: () {
                Navigator.push(context, new MaterialPageRoute(
                  builder: (BuildContext context) => _myDialog,
                  fullscreenDialog: true,
                ));
              },
            ),
            ),
          ],
        )
    );
  }

}


class FullScreenDialog extends StatefulWidget {
  String _skillOne = "You have";
  String _skillTwo = "not Added";
  String _skillThree = "any skills yet";

  @override
  FullScreenDialogState createState() => new FullScreenDialogState();
}

class FullScreenDialogState extends State<FullScreenDialog> {
  TextEditingController _skillOneController = new TextEditingController();
  TextEditingController _skillTwoController = new TextEditingController();

  TextEditingController _skillThreeController = new TextEditingController();

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
        appBar: new AppBar(
          title: new Text("Add your top 3 skills"),
        ),
        body: new Padding(child: new ListView(
          children: <Widget>[
            new TextField(controller: _skillOneController,),
            new TextField(controller: _skillTwoController,),
            new TextField(controller: _skillThreeController,),
            new Row(
              children: <Widget>[
                new Expanded(child: new RaisedButton(onPressed: () {
                  widget._skillThree = _skillThreeController.text;
                  widget._skillTwo = _skillTwoController.text;
                  widget._skillOne = _skillOneController.text;
                  Navigator.pop(context);
                }, child: new Text("Save"),))
              ],
            )
          ],
        ), padding: const EdgeInsets.symmetric(horizontal: 20.0),)
    );
  }


}

EDIT

After doing some research, it seems that this is a bug in the current Flutter version, the temporary fix is also documented in this issue.

import 'package:flutter/material.dart';

void main() {
  runApp(new MaterialApp(home: new FocusVisibilityDemo()));
}

class FocusVisibilityDemo extends StatefulWidget {
  @override
  _FocusVisibilityDemoState createState() => new _FocusVisibilityDemoState();
}


class _FocusVisibilityDemoState extends State<FocusVisibilityDemo> {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(title: new Text('Text Dialog Demo')),
      body: new Center(
        child: new RaisedButton(
          onPressed: _showDialog,
          child: new Text("Push Me"),
        ),
      ),
    );
  }

  _showDialog() async {
    await showDialog<String>(
      context: context,
      child: new _SystemPadding(child: new AlertDialog(
        contentPadding: const EdgeInsets.all(16.0),
        content: new Row(
          children: <Widget>[
            new Expanded(
              child: new TextField(
                autofocus: true,
                decoration: new InputDecoration(
                    labelText: 'Full Name', hintText: 'eg. John Smith'),
              ),
            )
          ],
        ),
        actions: <Widget>[
          new FlatButton(
              child: const Text('CANCEL'),
              onPressed: () {
                Navigator.pop(context);
              }),
          new FlatButton(
              child: const Text('OPEN'),
              onPressed: () {
                Navigator.pop(context);
              })
        ],
      ),),
    );
  }
}


class _SystemPadding extends StatelessWidget {
  final Widget child;

  _SystemPadding({Key key, this.child}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    var mediaQuery = MediaQuery.of(context);
    return new AnimatedContainer(
        padding: mediaQuery.viewInsets,
        duration: const Duration(milliseconds: 300),
        child: child);
  }
}