可以使用Image.memory
构造函数将Uint8List
转换为Flutter Image
构件.(如有必要,请使用Uint8List.fromList
构造函数将List
转换为Uint8List
.)你可以乘BASE64.encode
走另一条路.
以下是一些示例代码.
import 'dart:async';
import 'dart:convert';
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
void main() {
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
theme: new ThemeData.dark(),
home: new MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
State createState() => new MyHomePageState();
}
class MyHomePageState extends State<MyHomePage> {
String _base64;
@override
void initState() {
super.initState();
(() async {
http.Response response = await http.get(
'https://flutter.io/images/flutter-mark-square-100.png',
);
if (mounted) {
setState(() {
_base64 = BASE64.encode(response.bodyBytes);
});
}
})();
}
@override
Widget build(BuildContext context) {
if (_base64 == null)
return new Container();
Uint8List bytes = BASE64.decode(_base64);
return new Scaffold(
appBar: new AppBar(title: new Text('Example App')),
body: new ListTile(
leading: new Image.memory(bytes),
title: new Text(_base64),
),
);
}
}
然而,在数据库中存储大量二进制数据通常不是一个好主意.它没有发挥Firebase实时数据库的优势,最终会浪费带宽传输不需要的数据,以及不必要的编码和解码.您应该使用firebase_storage
插件,将图像的路径或下载URL存储在数据库中.