Getting an error when everything's supposed to work - flutter

Question

I'm building an app with Flutter where you can add files to the app's cache.
There are 2 things that are not working, which I don't understand why.
Here's the source
Whenever I launch the app for the first time (with absolutely no cache) I get this error
Directory listing failed, path = '/data/user/0/com.example.lockedapp/cache/file_picker/' (OS Error:
No such file or directory, errno = 2)
Even though I made precautions to create the directory before trying to display it.
bool checkFilesEmpty() {
var cache = new Directory('/data/user/0/com.example.lockedapp/cache/file_picker');
cache.exists().then((resp) => { if (!resp) { cache.create() } }); // creates a new cache directory if it does not exist
return cache.listSync(recursive: false).toList().length != 0; // returns false if it's empty
}
on line 31, the checkFilesEmpty is checked first and then comes everything else, but i still get the error.
the weird thing is that if I relaunch the app, it works as it's intended.
Any solutions for this? I'm really confused

Answer 1

Put your checkFilesEmpty in initState method of Stateful widget hence it will be called on before your widget is building.
class MyHomeState extends State<MyHome> {
bool filesEmpty;
#override
void initState() {
super.initState();
filesEmpty = checkFilesEmpty();
}
.
. // Your rest of code
.
}
You can put your error causing statement in try catch block. If there is no listing then you can create one in catch block:
bool checkFilesEmpty() {
try{
var cache = new Directory('/data/user/0/com.example.lockedapp/cache/file_picker');
return cache.listSync(recursive: false).toList().length != 0;
}
catch{
cache = Directory('/data/user/0/com.example.lockedapp/cache/file_picker').create() ;
return cache.listSync(recursive: false).toList().length != 0;
}
}