Android Question java.lang.RuntimeException: Object should be first initialized (List)

[Neojoy]

I'm using List var to get all files from a folder, i ever tested if it was initialized before save on my database, but frequentily returns an error: Object should be first initialized (List).

Is there another parameter from List object that should be tested too?

 

[Erel]

Can you post the relevant code and the full error message from the logs?

 

[rtek1000]

Hi,

Can you show us your code?

You can see this guide:
User's Guide (pdf)
(In your PDF reader: Try using CTRL + F keys to find a keyword 'list')
https://www.b4x.com/android/files/UserGuide.zip
You can see too:
[URL='https://www.b4x.com/android/files/guide.zip']Beginner's Guide (pdf)[/URL]
[URL='https://www.b4x.com/android/files/guide.zip'][URL='https://www.b4x.com/android/forum/forums/tutorials-examples.27/']Tutorials List[/URL][/URL]
(https://www.b4x.com/b4a.html)

 

[Neojoy]

Can you post the relevant code and the full error message from the logs?

What happen if the folder was empty?
It returns a Null object?

if positive, I can check if is list is not null and go on with my code, correct?.

 

[Erel]

The list will not be initialized (not null) if there is no such folder.

 

[Neojoy]

The list will not be initialized (not null) if there is no such folder.

You're right, I found the mistake, I was initialing my list var, but wasn't testing isinitialized parameter after get the list files

See part of my code:

files.Initialize
files = File.ListFiles(Folder)
For i = 0 To files.Size - 1...

It should be:

files = File.ListFiles(Folder)
if files.IsInitialized then
For i = 0 To files.Size - 1...