Android Question List files in DirAssets

Declan · Jun 13, 2017

Looking at this post:

https://www.b4x.com/android/forum/t...es-of-manually-created-folders.50836/#content

This is apparent:

File.ListFiles doesn't work with subfolders inside the assets folder.

How can I list the files in a folder "books" that I have created inside the assets folder?
I tried:

B4X:

Dim mylist As List = File.ListFiles(File.DirAssets & "books")

But Error:

B4X:

java.io.IOException: AssetsDirbooks is not a folder.
    at anywheresoftware.b4a.objects.streams.File.ListFiles(File.java:158)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:708)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:337)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:247)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:134)
    at JHS.SkyTest.main.afterFirstLayout(main.java:102)
    at JHS.SkyTest.main.access$000(main.java:17)
    at JHS.SkyTest.main$WaitForLayout.run(main.java:80)
    at android.os.Handler.handleCallback(Handler.java:815)
    at android.os.Handler.dispatchMessage(Handler.java:104)
    at android.os.Looper.loop(Looper.java:194)
    at android.app.ActivityThread.main(ActivityThread.java:5631)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)

DonManfred · Jun 13, 2017

AssetsDirbooks????

INSERT a / or use file.combine...

Misterbates · Jun 13, 2017

take a look at file.combine ...

Declan · Jun 13, 2017

Tried:

B4X:

Dim mylist As List = File.ListFiles(File.DirAssets & "/books")

and:

B4X:

Dim mylist As List = File.ListFiles(File.Combine(File.DirAssets, "books"))

Same error

ronell · Jun 13, 2017

you cannot access the folders in dirassets, try copying the Files in DirRootExternal or DirDefaultExternal

Star-Dust · Jun 13, 2017

Maybe the Book folder is not there. If you want to check if it is present, try this

B4X:

    Try
    Dim mylist As List = File.ListFiles(File.DirAssets)
    Dim B As Boolean = False
   
    For Each nf As String In mylist
        If nf.IndexOf("book")>-1 Then B=True
    Next
   
    Log(B)
    Catch
        Log(LastException.Message)
    End Try

You can only access DirAssest to read

ronell · Jun 13, 2017

try this .. see if the folder(books) will not appear in the logs

B4X:

Dim list As List
    list = File.ListFiles(File.DirAssets)
    For i = 0 To list.Size - 1
        Log(list.Get(i))
    Next

Declan · Jun 13, 2017

ronell said:
try this .. see if the folder(books) will not appear in the logs

B4X:

Dim list As List list = File.ListFiles(File.DirAssets) For i = 0 To list.Size - 1 Log(list.Get(i)) Next

Folder books does appear in the logs:

B4X:

** Service (starter) Create **
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
in wrapper and event name  = sk
.DS_Store
books
fonts
images
library_black.png
library_white.png
main.bal
sql
_assets_map

Declan · Jun 13, 2017

Star-Dust said:
Maybe the Book folder is not there. If you want to check if it is present, try this

B4X:

Try Dim mylist As List = File.ListFiles(File.DirAssets) Dim B As Boolean = False For Each nf As String In mylist If nf.IndexOf("book")>-1 Then B=True Next Log(B) Catch Log(LastException.Message) End Try

You can only access DirAssest to read

B == true (so folder "books" is present) but how to list the files in the folder.

Star-Dust · Jun 13, 2017

The ListFile command could return the file name along with the entire path, or with an extension, so it may not be recognized if you only search for the word "book", so you must check with IndexOf

Star-Dust · Jun 13, 2017

I think's isn't possible access with ListFiles becouse File.DirAssets (in release mode) is a virtual folder. It doesn't point to any useful path. (see https://www.b4x.com/android/forum/threads/file-dirassets-full-path.62729/#post-396046)

DonManfred · Jun 13, 2017

Create the list by yourself on pc. copy a file with the list to assets and read this file.
That´s the best way...

Misterbates · Jun 13, 2017

Using the code below, ListAllFiles does not recognise any subfolder or list files inside it. Guess you'll need to "flatten" your folder structure (by putting all files in the main Files folder but renaming to replace "/" with "$" or similar in the full path name) then recreate the structure in File.DirInternal on App startup.

B4X:

Sub Activity_Create(FirstTime As Boolean)
    ListAllFiles(File.DirAssets)
    Activity.Finish
End Sub

Sub ListAllFiles(sFolder As String)
    Dim oList As List = File.ListFiles(sFolder)
    For Each sFile In oList
        Log(File.Combine(sFolder, sFile))
        If File.IsDirectory(sFolder, sFile) Then ListAllFiles(File.Combine(sFolder, sFile))
    Next
End Sub

Android Question List files in DirAssets

Declan

Well-Known Member

DonManfred

Expert

Misterbates

Active Member

Declan

Well-Known Member

ronell

Well-Known Member

Star-Dust

Expert

ronell

Well-Known Member

Declan

Well-Known Member

Declan

Well-Known Member

Star-Dust

Expert

Star-Dust

Expert

DonManfred

Expert

Misterbates

Active Member

Similar Threads

Android Question List files in DirAssets

Well-Known Member

Expert

Active Member

Well-Known Member

Well-Known Member

Expert

Well-Known Member

Well-Known Member

Well-Known Member

Expert

Expert

Expert

Active Member

Similar Threads

Privacy & Transparency

Privacy & Transparency