Question

我想在Listview中的图像上显示文本。我能够看到图像和文本，但文本将显示在左上角。我想在每个图像的每个文本上显示它。下面是我的代码。请帮助我

import 'dart:async';
import 'dart:convert';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:http/http.dart' as http;

Future<List<Photo>> fetchPhotos(http.Client client) async {
  final response = await client.get('url here');
  return compute(parsePhotos, response.body);
}

// A function that will convert a response body into a List<Photo>
List<Photo> parsePhotos(String responseBody) {
  final parsed = json.decode(responseBody);
  return (parsed["data"]["categoryList"] as List)
      .map<Photo>((json) => new Photo.fromJson(json))
      .toList();
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    SystemChrome.setEnabledSystemUIOverlays([]);
    return new MyHomePage();
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key}) : super(key: key);

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

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return new FutureBuilder<List<Photo>>(
      future: fetchPhotos(new http.Client()),
      builder: (context, snapshot) {
        if (snapshot.hasError) print(snapshot.error);
        return snapshot.hasData
            ? new PhotosList(photos: snapshot.data)
            : new Center(child: new CircularProgressIndicator());
      },
    );
  }
}

class PhotosList extends StatelessWidget {
  final List<Photo> photos;

  PhotosList({Key key, this.photos}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return _buildBody();
  }

  Widget _buildBody() {
    return new Stack(
      children: <Widget>[
        new Positioned(
            child: new Container(
              child: new ListView.builder(
                  itemCount: photos.length,
                  itemBuilder: (context,int){
              return new Text(photos[int].title);
            }
           ),
          )
        ),
        new ListView.builder(
            itemCount: photos.length,
            itemBuilder: (context,int){
              return new CachedNetworkImage(imageUrl: photos[int].url);
            }
        ),
      ],
    );
  }
}

class Photo {
  final int catID;
  final String title;
  final String url;
  final String thumbnailUrl;
  final String description;
  final String webstiteURL;

  Photo(
      {this.catID,
      this.title,
      this.url,
      this.thumbnailUrl,
      this.description,
      this.webstiteURL});

  factory Photo.fromJson(Map<String, dynamic> json) {
    return new Photo(
      catID: json['category_id'] as int,
      title: json['category_name'] as String,
      url: json['category_img'] as String,
      thumbnailUrl: json['thumb_img'] as String,
      description: json['description'] as String,
      webstiteURL: json['website_url'] as String,
    );
  }
}

Answer 1

您可以为此使用Stack小部件：

Stack(
    children: <Widget>[
        yourImageWidget,
        Center(child: Text("someText")),
    ]
)

PhotosList类：

PhotosList({Key key, this.photos}) : super(key: key);

@override
Widget build(BuildContext context) {
    return _buildBody();
}

Widget _buildBody() {
    return new ListView.builder(
            itemCount: photos.length,
            itemBuilder: (context,int){
            return Stack(
                children: <Widget> [
                    new CachedNetworkImage(imageUrl: photos[int].url),
                    Center(child: Text(photos[int].title)),
                ]
            );
            }
        );
    }
}

Answer 2

我发现此方法效果更好，并且您不需要Center小部件：

Stack(
    alignment: Alignment.center,
    children: <Widget>[
        yourImageWidget,
        Text("someText"),
    ]
)

Answer 3

尝试

Container(
         child: Center(child: Text('test'),),
         height: 190.0,
         width: MediaQuery.of(context).size.width - 100.0,
         decoration: BoxDecoration(
         borderRadius: BorderRadius.circular(5),
         color: Colors.blue,
         image: DecorationImage(
                image: new NetworkImage(
                "https://storage.googleapis.com/gd-wagtail-prod-assets/original_images/MDA2018_inline_03.jpg"
                  ),
          fit: BoxFit.fill
              )
                 ),
              ),

Answer 4

只想添加一个Stack Widget的小例子

return Scaffold(
  appBar: AppBar(
    title: Text("Text Over Image"),
  ),
  body: Center(
    child: Stack(
      children: <Widget>[
        Container(
          alignment: Alignment.center,
          child: Image.network(
            'https://cdn.pixabay.com/photo/2018/07/11/21/51/toast-3532016_1280.jpg',
            height: 250,
            width: double.infinity,
            fit: BoxFit.cover,
          ),
        ),
        Container(
            alignment: Alignment.center,
            child: Text(
              'Text Message',
              style: TextStyle(color: Colors.white,
                  fontWeight: FontWeight.bold,
                  fontSize: 22.0),
            )),
      ],
    ),
  ),
);

输出：

enter image description here

供参考： https://medium.com/flutterworld/flutter-text-over-image-bb045a129bae

Answer 5

试试这个

Card(
      elevation: 4,
      margin: EdgeInsets.fromLTRB(0.0, 4.0, 4.0, 4.0),
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(4.0),
      ),
      shadowColor: Colors.white,
      color: Colors.white70,
      child: Stack(children: <Widget>[
        Center(
          child: Image(
            image: NetworkImage(ApiContent.PREF_IMAGES_PATH +
                _listMomentListModel[index].filePath),
          ),
        ),
        Column(mainAxisAlignment: MainAxisAlignment.end, children: [
          Container(
              width: double.infinity,
              color: Colors.white,
              padding: EdgeInsets.fromLTRB(8.0, 8.0, 8.0, 8.0),
              child: Text(
                _listMomentListModel[index].title,
                maxLines: 5,
                textAlign: TextAlign.center,
              )),
        ]),
      ]),
    );

设置文字底部

                mainAxisAlignment: MainAxisAlignment.end,

设置文字置顶

                mainAxisAlignment: MainAxisAlignment.start,

设置文本中心

                mainAxisAlignment: MainAxisAlignment.center,

如何在Flutter中在图像上显示文本？

5 个答案:

试试这个