因此，我正在开发一个聊天应用程序，该程序可以从Firebase读取和写入数据。 我有一个Streambuilder（显示消息），它位于Container小部件（用于保存输入文本字段）上方
我的问题是，当我点击输入字段并且弹出键盘时，它覆盖了消息文本字段。
我已经完成了Stackoverflow的许多解决方案，但在我看来，这些解决方案都不起作用。我尝试过的技术是 -resizeToAvoidBottomInset：true -扩展（当我尝试此消息时不再显示） -灵活
我在另一个项目中测试了相同的代码，并且可以正常工作。文本字段位于键盘顶部。它只是在使用Bloc Pattern的特定项目中不起作用。可能有一些脚手架错误，或者我不知道。请帮助
import 'chat_design.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
final _firestore = Firestore.instance;
FirebaseUser loggedInUser;
class ChatScreen extends StatefulWidget {
static const String id = 'chat_screen';
@override
_ChatScreenState createState() => _ChatScreenState();
}
class _ChatScreenState extends State<ChatScreen> {
final messageTextController = TextEditingController();
final _auth = FirebaseAuth.instance;
String messageText;
@override
void initState() {
// TODO: implement initState
super.initState();
getCurrentUser();
}
void getCurrentUser() async {
try {
final user = await _auth.currentUser();
if (user != null) {
loggedInUser = user;
print(loggedInUser.email);
}
} catch (e) {
print(e);
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
leading: null,
actions: <Widget>[
IconButton(
icon: Icon(Icons.close),
onPressed: () {
_auth.signOut();
Navigator.pop(context);
}),
],
title: Text('⚡️Chat'),
backgroundColor: Colors.lightBlueAccent,
),
body: SafeArea(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
MessagesStream(),
Container(
decoration: kMessageContainerDecoration,
child: Row(
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Expanded(
child: TextField(
controller: messageTextController,
onChanged: (value) {
//Do something with the user input.
messageText = value;
},
decoration: kMessageTextFieldDecoration,
),
),
FlatButton(
onPressed: () {
messageTextController.clear();
//Implement send functionality.
_firestore.collection('messages').add({
'text': messageText,
'sender': loggedInUser.email,
});
},
child: Text(
'Send',
style: kSendButtonTextStyle,
),
),
],
),
),
],
),
),
);
}
}
class MessagesStream extends StatelessWidget {
@override
Widget build(BuildContext context) {
return StreamBuilder<QuerySnapshot>(
stream: _firestore.collection('messages').limit(100).snapshots(),
builder: (context, snapshot) {
//wait before data is loaded
if(snapshot.data == null) return Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
SizedBox(
width: 50,
height: 50,
child: CircularProgressIndicator(strokeWidth: 7,),
),
],
);
final messages = snapshot.data.documents.reversed;
List<MessageBubble> messageBubbles = [];
for (var message in messages) {
final messageText = message.data['text'];
final messageSender = message.data['sender'];
final currentUser = loggedInUser.email;
final messageBubble = MessageBubble(
sender: messageSender,
text: messageText,
isMe :currentUser == messageSender,
);
messageBubbles.add(messageBubble);
}
return Expanded(
child: ListView(
reverse: true,
padding:
EdgeInsets.symmetric(horizontal: 10.0, vertical: 20.0),
children: messageBubbles,
),
);
},
);
}
}
class MessageBubble extends StatelessWidget {
MessageBubble({this.sender, this.text,this.isMe});
final String sender;
final String text;
final bool isMe;
@override
Widget build(BuildContext context) {
return Padding(
padding: const EdgeInsets.all(10.0),
child: Column(
crossAxisAlignment: isMe ? CrossAxisAlignment.end : CrossAxisAlignment.start,
children: <Widget>[
Text(
sender,
style: TextStyle(
fontSize: 12.0,
color: Colors.black54,
),
),
Material(
borderRadius: isMe ? BorderRadius.only(topLeft: Radius.circular(30.0),
bottomLeft: Radius.circular(30.0),
bottomRight: Radius.circular(15.0))
:BorderRadius.only(topRight: Radius.circular(30.0),
bottomLeft: Radius.circular(15.0),
bottomRight: Radius.circular(30.0)),
color: isMe ? Colors.lightBlueAccent: Colors.white,
child: Padding(
padding: EdgeInsets.symmetric(horizontal: 10.0, vertical: 20.0),
child: Text(
'$text',
style: TextStyle(
color: isMe ? Colors.white : Colors.black,
fontSize: 15.0,
),
),
),
),
],
),
);
}
}
答案 0 :(得分：2)
在“正文”下获取ListView或SingleChildScrollView。然后在Scaffold中使用bottomNavigationBar。
Scaffold(
body: ListView(
children: [],
),
bottomNavigationBar: Container(
padding: MediaQuery.of(context).viewInsets,
color: Colors.grey[300],
child: Container(
padding: EdgeInsets.symmetric(vertical: 2),
margin: EdgeInsets.symmetric(horizontal: 5),
child: TextField(
decoration: InputDecoration(
border: InputBorder.none,
hintText: 'Type a message',
),
))
),
);
答案 1 :(得分：0)
我认为您需要使用SingleChildScrollView，当键盘显示时内容将滚动，下面举两个例子：
// Flutter code sample for
// In this example, the children are spaced out equally, unless there's no more
// room, in which case they stack vertically and scroll.
//
// When using this technique, [Expanded] and [Flexible] are not useful, because
// in both cases the "available space" is infinite (since this is in a viewport).
// The next section describes a technique for providing a maximum height constraint.
import 'package:flutter/widgets.dart';
void main() => runApp(MyApp());
/// This Widget is the main application widget.
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return WidgetsApp(
title: 'Flutter Code Sample',
builder: (BuildContext context, Widget navigator) {
return MyStatelessWidget();
},
color: const Color(0xffffffff),
);
}
}
/// This is the stateless widget that the main application instantiates.
class MyStatelessWidget extends StatelessWidget {
MyStatelessWidget({Key key}) : super(key: key);
@override
Widget build(BuildContext context) {
return LayoutBuilder(
builder: (BuildContext context, BoxConstraints viewportConstraints) {
return Scrollbar(
child: SingleChildScrollView(
child: ConstrainedBox(
constraints: BoxConstraints(
minHeight: viewportConstraints.maxHeight,
),
child: Column(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
Container(
// A fixed-height child.
color: const Color(0xff808000), // Yellow
height: 120.0,
),
Container(
// Another fixed-height child.
color: const Color(0xff008000), // Green
height: 120.0,
),
],
),
),
),
);
},
);
}
}
SingleChildScrollView的另一个示例
// Flutter code sample for
// In this example, the column becomes either as big as viewport, or as big as
// the contents, whichever is biggest.
import 'package:flutter/widgets.dart';
void main() => runApp(MyApp());
/// This Widget is the main application widget.
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return WidgetsApp(
title: 'Flutter Code Sample',
builder: (BuildContext context, Widget navigator) {
return MyStatelessWidget();
},
color: const Color(0xffffffff),
);
}
}
/// This is the stateless widget that the main application instantiates.
class MyStatelessWidget extends StatelessWidget {
MyStatelessWidget({Key key}) : super(key: key);
@override
Widget build(BuildContext context) {
return LayoutBuilder(
builder: (BuildContext context, BoxConstraints viewportConstraints) {
return SingleChildScrollView(
child: ConstrainedBox(
constraints: BoxConstraints(
minHeight: viewportConstraints.maxHeight,
),
child: IntrinsicHeight(
child: Column(
children: <Widget>[
Container(
// A fixed-height child.
color: const Color(0xff808000), // Yellow
height: 120.0,
),
Expanded(
// A flexible child that will grow to fit the viewport but
// still be at least as big as necessary to fit its contents.
child: Container(
color: const Color(0xff800000), // Red
height: 120.0,
),
),
],
),
),
),
);
},
);
}
}
答案 2 :(得分：0)
尝试以下操作：转到您的AndroidManifest.xml并删除：
application：activity标签下的android：windowSoftInputMode =“ adjustResize”。
基本上，只需更改一下即可：
<activity
android:name=".MainActivity"
android:launchMode="singleTop"
android:theme="@style/LaunchTheme"
android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
android:hardwareAccelerated="true"
android:windowSoftInputMode="adjustResize">
对此：
<activity
android:name=".MainActivity"
android:launchMode="singleTop"
android:theme="@style/LaunchTheme"
android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
android:hardwareAccelerated="true"
>
为我的一个应用程序工作。