英文:
DECODE BASE64STRING TO IMAGE IN FLUTTER
问题
这是我的代码来显示图片，但最终出现了以下错误：
I/flutter (15439): 格式异常：无效的长度，必须是四的倍数（在字符256处）
有人可以帮助我吗？
英文:
this my code to display image
body: ListView.builder(
itemCount: jsonList == null ? 0 : jsonList.length,
itemBuilder: (BuildContext context, int index) {
return ListTile(
leading:Image(image: MemoryImage(base64Decode(base64String))),
trailing: Text(jsonList[index]['pname']
,
style: TextStyle(color: Colors.brown, fontSize: 15),
),
title: Text(jsonList[index]['pdesc']),
);
}),
but end up with this error
I/flutter (15439): FormatException: Invalid length, must be multiple of four (at character 256)
I/flutter (15439): ...2vt6b997q855/zhVdW9337r3dgewn+fll6e607fqVJ3z/Z3z209deIfeof+fSfytO1CEBCfeR+0
I/flutter (15439):
anybody please help me?
答案1
得分: 0
The base64String is wrong, try another and it should work for you. I'll send you an example.
import 'dart:convert';
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
final List jsonList = [
{"pname": "test", "pdesc": "example"}
];
//String base64String =
// "iVBORw0KGgoAAAANSUhEUgAAAGAAAABgCAYAAADimHc4AAAABHNCSVQICAgIfAhkiAAAIABJREFUeJztnXmYHVWd9z/nVN2lt3R30p3urIQkhCSQEMISdjCIEEZREYbNDcdxXubl9cGRxdFBZdwQlRl1RHnAEXVEUV9FUXYxISQhZCH7TrbO2vt6b997q855/zhVdW9337r3dgewn+fll6e607fqVJ3z/Z3z209deIfeof+fSfytO1CEBCfeR+0";
String base64String =
"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";
return MaterialApp(
title: 'Material App',
home: Scaffold(
appBar: AppBar(
title: const Text('Material App Bar'),
),
body: ListView.builder(
itemCount: jsonList.length,
itemBuilder: (BuildContext context, int index) {
return ListTile(
leading: Image(image: MemoryImage(base64Decode(base64String))),
trailing: Text(
jsonList[index]['pname'],
style: const TextStyle(color: Colors.brown, fontSize: 15),
),
title: Text(jsonList[index]['pdesc']),
);
}),
),
);
}
}
英文:
The base64String is wrong, try another and it should work for you. I'll send you an example.
import 'dart:convert';
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
final List jsonList = [
{"pname": "test", "pdesc": "example"}
];
//String base64String =
// "iVBORw0KGgoAAAANSUhEUgAAAGAAAABgCAYAAADimHc4AAAABHNCSVQICAgIfAhkiAAAIABJREFUeJztnXmYHVWd9z/nVN2lt3R30p3urIQkhCSQEMISdjCIEEZREYbNDcdxXubl9cGRxdFBZdwQlRl1RHnAEXVEUV9FUXYxISQhZCH7TrbO2vt6b997q855/zhVdW9337r3dgewn+fll6e607fqVJ3z/Z3z209deIfeof+fSfytO1CEBCfeR+0";
String base64String =
"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";
return MaterialApp(
title: 'Material App',
home: Scaffold(
appBar: AppBar(
title: const Text('Material App Bar'),
),
body: ListView.builder(
itemCount: jsonList.length,
itemBuilder: (BuildContext context, int index) {
return ListTile(
leading: Image(image: MemoryImage(base64Decode(base64String))),
trailing: Text(
jsonList[index]['pname'],
style: const TextStyle(color: Colors.brown, fontSize: 15),
),
title: Text(jsonList[index]['pdesc']),
);
}),
),
);
}
}
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