flutter_cache_manager 1.4.0 flutter_cache_manager: ^1.4.0 copied to clipboard
Generic cache manager for flutter. Saves web files on the storages of the device and saves the cache info using sqflite.
import 'package:flutter/material.dart';
import 'package:flutter_cache_manager/flutter_cache_manager.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Cache Manager Demo',
home: MyHomePage(),
);
}
}
const url = 'https://blurha.sh/assets/images/img1.jpg';
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
Stream<FileResponse> fileStream;
void _downloadFile() {
setState(() {
fileStream = DefaultCacheManager().getFileStream(url, withProgress: true);
});
}
@override
Widget build(BuildContext context) {
if (fileStream == null) {
return Scaffold(
appBar: _appBar(),
body: const ListTile(
title: Text('Tap the floating action button to download.')),
floatingActionButton: Fab(
downloadFile: _downloadFile,
),
);
}
return DownloadPage(
fileStream: fileStream,
downloadFile: _downloadFile,
clearCache: _clearCache,
);
}
void _clearCache() {
DefaultCacheManager().emptyCache();
setState(() {
fileStream = null;
});
}
}
class DownloadPage extends StatelessWidget {
final Stream<FileResponse> fileStream;
final VoidCallback downloadFile;
final VoidCallback clearCache;
const DownloadPage(
{Key key, this.fileStream, this.downloadFile, this.clearCache})
: super(key: key);
@override
Widget build(BuildContext context) {
return StreamBuilder<FileResponse>(
stream: fileStream,
builder: (context, snapshot) {
Widget body;
var loading = !snapshot.hasData || snapshot.data is DownloadProgress;
if (snapshot.hasError) {
body = ListTile(
title: const Text('Error'),
subtitle: Text(snapshot.error.toString()),
);
} else if (loading) {
body = ProgressIndicator(progress: snapshot.data as DownloadProgress);
} else {
body = FileInfoWidget(
fileInfo: snapshot.data as FileInfo,
clearCache: clearCache,
);
}
return Scaffold(
appBar: _appBar(),
body: body,
floatingActionButton: !loading
? Fab(
downloadFile: downloadFile,
)
: null,
);
},
);
}
}
AppBar _appBar() {
return AppBar(
title: const Text('Flutter Cache Manager Demo'),
);
}
class Fab extends StatelessWidget {
final VoidCallback downloadFile;
const Fab({Key key, this.downloadFile}) : super(key: key);
@override
Widget build(BuildContext context) {
return FloatingActionButton(
onPressed: downloadFile,
tooltip: 'Download',
child: Icon(Icons.cloud_download),
);
}
}
class ProgressIndicator extends StatelessWidget {
final DownloadProgress progress;
const ProgressIndicator({Key key, this.progress}) : super(key: key);
@override
Widget build(BuildContext context) {
return Center(
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(
width: 50.0,
height: 50.0,
child: CircularProgressIndicator(
value: progress?.progress,
),
),
const SizedBox(width: 20.0),
const Text('Downloading'),
],
),
);
}
}
class FileInfoWidget extends StatelessWidget {
final FileInfo fileInfo;
final VoidCallback clearCache;
const FileInfoWidget({Key key, this.fileInfo, this.clearCache})
: super(key: key);
@override
Widget build(BuildContext context) {
return ListView(
children: <Widget>[
ListTile(
title: const Text('Original URL'),
subtitle: Text(fileInfo.originalUrl),
),
if (fileInfo.file != null)
ListTile(
title: const Text('Local file path'),
subtitle: Text(fileInfo.file.path),
),
ListTile(
title: const Text('Loaded from'),
subtitle: Text(fileInfo.source.toString()),
),
ListTile(
title: const Text('Valid Until'),
subtitle: Text(fileInfo.validTill.toIso8601String()),
),
Padding(
padding: const EdgeInsets.all(10.0),
child: RaisedButton(
child: const Text('CLEAR CACHE'),
onPressed: clearCache,
),
),
],
);
}
}