Android Question ExternalStorage - How to detect if user press BACK key?

artsoft

Active Member
Licensed User
Longtime User
Hi!

I have to write a file to external SD card.

For this I am using this ExternalStorage class:

https://www.b4x.com/android/forum/t...access-sd-cards-and-usb-sticks.90238/#content

My question is now:

How I can detect if the user stopped the choosing of a folder by pressing the BACK key (1 or more times).

In my code (while debugging my app), the debugger doesn't make any halt on any breakpoint after these 2 lines when I am testing exactly this case:

B4X: 
Storage.SelectDir(False)
Wait For Storage_ExternalFolderAvailable

In the beginning of using this class ...when I initialize the ExternalStorage object with these commands ...

B4X: 
If (Storage.IsInitialized == False) Then
    Storage.Initialize(Me, "Storage")
End If

... how is the name of the event method within my activity code?

Sub Storage_???? () ....

I guess that the string "Storage" is part of the callSubDelayed string "Storage_ExternalFolderAvailable", right?

I hope, somebody can help very quickly.
Thanks a lot in advance.

Regards
ARTsoft
 
Last edited:
Sort by date Sort by votes

artsoft

Active Member
Licensed User
Longtime User
In the older version 1.02 of ExternalStorage (a code lib), I found this:


B4X: 
Private Sub SetPickedDir
    Root = DocumentFileToExternalFile(GetPickedDir(PersistantUri))
    CallSubDelayed(mCallback, mEventName & "_ExternalFolderAvailable")
End Sub

Private Sub ion_Event (MethodName As String, Args() As Object) As Object
    If Args(0) = -1 Then 'resultCode = RESULT_OK
        Dim i As Intent = Args(1)
        Dim jo As JavaObject = i
        Dim treeUri As Uri = jo.RunMethod("getData", Null)
        Dim takeFlags As Int = Bit.And(i.Flags, 3)
        ctxt.RunMethodJO("getContentResolver", Null).RunMethod("takePersistableUriPermission", Array(treeUri, takeFlags))
        Dim temp As Object = treeUri
        PersistantUri = temp
        File.WriteString(File.DirInternal, FileName, PersistantUri)
        Log(PersistantUri)
        SetPickedDir
    End If
    Return Null
End Sub

So, we can see that only in case of a successful selection of a folder, the method "SetPickedDir" is called. An this message triggers exactly the "Storage_ExternalFolderAvailable" (what I guess above).

Otherwise I am catched in the WAIT-loop ... :-(

It would be better to set "Root" to Null or something like this - but also in this case the event "Storage_ExternalFolderAvailable" should be triggered!

Is it possible to extend the class (or better the lib) accordingly?
Or what can I do?

Regards
ARTsoft
 
Upvote 0

JohnC

Expert
Licensed User
Longtime User
See if this will help:

Loop bug? + Can't detect user Cancel in ExternalStorage

Using the example in this post: https://www.b4x.com/android/forum/threads/externalstorage-access-sd-cards-and-usb-sticks.90238/ I modified the PickFolder sub to include an "entry" log and an "exit" log tracing: Sub btnPickFolder_Click Log("Start SelectDir")...
www.b4x.com
 
Upvote 0

artsoft

Active Member
Licensed User
Longtime User

Hi JohnC!

Yes this helps a lot.
Thanks.

Regards
ARTsoft
 
Upvote 0
You must log in or register to reply here.
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…