How can I save data to permanent storage and retrieve it? - flutter

Question

I want to save data on device which it should be visible to user when he/she went to the desired path from file manager.
now I have two problem:
1-
like social networks which save images in storage ( not cache images ) , I want to save my images into desired path storage and the images should be accessable like cacheNetworkImage.
so what should I do ?
because I loads many images , caching them is not a good solution because it occupy a high amount of RAM.
2-
this scenario is like Previous but I download some media into my storage with some IDs.
but I a want to read only IDs and if user click on that file , execute it.
so How can I access name of existing files in that file of storage path ?
thanks to community. any help is appreciated.

Answer 1

You can chose between basic path_provider library and more advanced network_to_file_image library.
In the first one you can list your files and read them this way:
void checkDirs() async{
Directory tempDir = await getApplicationDocumentsDirectory();
List<FileSystemEntity> directory = tempDir.listSync();
directory.forEach((x) => debugPrint(x.path));
}
Future<File> readImage(String path) async{
return File(path);
}
And render it this way:
Container(child: FutureBuilder<File>(
future: readImage("some_path"),
builder: (BuildContext context,
AsyncSnapshot<File> snapshot) {
if (snapshot.connectionState ==
ConnectionState.done &&
snapshot.data != null) {
return Image.file(
snapshot.data,
);
} else if (snapshot.error != null) {
return const Text(
'Error Picking Image',
textAlign: TextAlign.center,
);
} else {
return const Text(
"No photo"
);
}
},
))
The second one is well documented on the link.