network_file_cached

Description:

network file cached

Usage #
Usage example with PDFView to display cached pdf files.

class FileCacheSample extends StatefulWidget {
const FileCacheSample({super.key, required this.url});

final String url;

@override
State<FileCacheSample> createState() => _FileCacheSampleState();
}

class _FileCacheSampleState extends State<FileCacheSample> {
Future<File>? file;

@override
void initState() {
super.initState();
file = getFile();
}

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Plugin example apps'),
),
body: FutureBuilder(
future: file,
builder: (context, snapshot) {
if (snapshot.hasData) {
return PDFView(
pdfData: snapshot.data?.readAsBytesSync(),
);
}
if (snapshot.hasError) {
return Text(snapshot.error.toString());
}
return const Text('LOADING...');
},
),
);
}

Future<File> getFile() {
return NetworkFileCached.downloadFile(widget.url);
}
}
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Usage example with loading indicator to display cached pdf files.
await NetworkFileCached.downloadFile(url, onReceiveProgress: (rcv, total) {
setState(() {
progress = ((rcv / total) * 100);
});
}).then((value) {
setState(() {
file = value;
});
}).onError((error, stackTrace) {
setState(() {
errorMessage = error.toString();
});
throw Exception(error);
});
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Full code
class FileCacheLoadingIndicator extends StatefulWidget {
const FileCacheLoadingIndicator({super.key, required this.url});

final String url;

@override
State<FileCacheLoadingIndicator> createState() =>
_FileCacheLoadingIndicatorState();
}

class _FileCacheLoadingIndicatorState extends State<FileCacheLoadingIndicator> {
bool downloading = false;
double progress = 0;
bool isDownloaded = false;
File? file;
String errorMessage = '';

@override
void initState() {
load(widget.url);
super.initState();
}

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Plugin example apps'),
),
body: errorMessage.isNotEmpty
? Center(
child: Text(errorMessage),
)
: file == null
? Center(
child: Stack(
alignment: AlignmentDirectional.center,
children: [
CircularProgressIndicator(
value: (progress == 0) ? null : progress / 100,
),
if (progress != 0)
Text(
progress.toStringAsFixed(0),
style: const TextStyle(fontSize: 12),
)
],
),
)
: PDFView(
pdfData: file!.readAsBytesSync(),
),
);
}

Future<void> load(String url) async {
await NetworkFileCached.downloadFile(url, onReceiveProgress: (rcv, total) {
setState(() {
progress = ((rcv / total) * 100);
});
}).then((value) {
setState(() {
file = value;
});
}).onError((error, stackTrace) {
setState(() {
errorMessage = error.toString();
});
throw Exception(error);
});
}
}
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