£50 for the first working solution. SDK30 Android/data read/write

Magma

Magma

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aidymp... search how can be ... if it can be in java... not sure...

but "really" why not making a wish...

Anytime get into there - i feel lucky ! - and have in mind that this you are asking - need many users too.. so more users... fast tip !
 
Xfood

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this is the code I use, and for now it seems to work for me

B4X: 
For Each permission As String In Array(rp.PERMISSION_READ_EXTERNAL_STORAGE,rp.PERMISSION_CAMERA,rp.PERMISSION_WRITE_EXTERNAL_STORAGE)
            rp.CheckAndRequest(permission)
            Wait For Activity_PermissionResult (permission As String, Result As Boolean)
            If Result = False Then
                ToastMessageShow("No permission!", True)
                Activity.Finish
                Return
            End If
        Next


I add this to the manifest
B4X: 
'Manifest'

AddPermission("android.permission.READ_EXTERNAL_STORAGE")
AddPermission("android.permission.WRITE_EXTERNAL_STORAGE")
'
SetApplicationAttribute(android:requestLegacyExternalStorage, true)
 
aidymp

aidymp

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Xfood said:
this is the code I use, and for now it seems to work for me

B4X: 
For Each permission As String In Array(rp.PERMISSION_READ_EXTERNAL_STORAGE,rp.PERMISSION_CAMERA,rp.PERMISSION_WRITE_EXTERNAL_STORAGE)
            rp.CheckAndRequest(permission)
            Wait For Activity_PermissionResult (permission As String, Result As Boolean)
            If Result = False Then
                ToastMessageShow("No permission!", True)
                Activity.Finish
                Return
            End If
        Next


I add this to the manifest
B4X: 
'Manifest'

AddPermission("android.permission.READ_EXTERNAL_STORAGE")
AddPermission("android.permission.WRITE_EXTERNAL_STORAGE")
'
SetApplicationAttribute(android:requestLegacyExternalStorage, true)
Click to expand...
on Android 11??
 
aidymp

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Xfood said:
yes
Click to expand...

OK, Can i ask what SDK version your android.jar is?

Screenshot 2022-03-08 20.06.06.png
 
agraham

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aidymp said:
Sorry your being very cryptic! LOL
Click to expand...
Cryptic? - How? I'm being as precise as I can be

Xfood said:
SetApplicationAttribute(android:requestLegacyExternalStorage, true)
Click to expand...
That's a temporary workaround that will only work on SDK 29 targets. You should have read it here

android.jar / targetSdkVersion / minSdkVersion

There are several versioned components that affect the compilation process and the runtime behavior of our apps. The purpose of this tutorial is to explain the differences between them and help you choose which version to use. Each Android version is mapped to an api level. You can see this...
www.b4x.com www.b4x.com

There is no need to manually add the "AddPermission" lines to the manifest. B4A should add them and you automatically get read permission if you ask for write permission.
 
Xfood

Xfood

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agraham said:
Cryptic? - How? I'm being as precise as I can be


That's a temporary workaround that will only work on SDK 29 targets. You should have read it here

android.jar / targetSdkVersion / minSdkVersion

There are several versioned components that affect the compilation process and the runtime behavior of our apps. The purpose of this tutorial is to explain the differences between them and help you choose which version to use. Each Android version is mapped to an api level. You can see this...
www.b4x.com www.b4x.com

There is no need to manually add the "AddPermission" lines to the manifest. B4A should add them and you automatically get read permission if you ask for write permission.
Click to expand...
this is my manifest, in fact if you don't put sdk 30 you can't publish on playstore
I Public On Playstore

play.google.com

OrderStock Ordine Inventario - Apps on Google Play

Finally you can manage your shop without spending a penny, Barcode Reading
play.google.com play.google.com

play.google.com

Raccolta Ordini PDT - Apps on Google Play

PDT 3100 simulator
play.google.com play.google.com

1646770975434.png
 
aidymp

aidymp

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agraham said:
Cryptic? - How? I'm being as precise as I can be
Click to expand...

Sorry I have twin boys with Autism, They make me lose concentration quite easily.. I basically read your "Barking at the moon" and then your reply that said it can be done in B4A, I was confused... no offence was implied.

Thanks

Adrian
 
aidymp

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aidymp

aidymp

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agraham said:
Nope> As I have said before ad nauseam. You won't be able to without using the Storage Access Framework hack.
Click to expand...

yes i am aware, but the hack has gone clean over my adhd head!

hence my small offer, if someone could provide small, clear steps.

or a big massive sign that would be great...

what i got from your comments was the secret is in the class??

but the class is mostly java and in my (basic coders) eyes contains nothing relating to a file path?

i noted that the permission would attept to access the Android/data folder and the user would pick said folder and access would be granted but that is clearly way above my knowledge.

am i close??
 
agraham

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OK, I wasn't going to bother but you wore me down. Try this project. It has a modified External Storage class module that opens Android/data as the pre-selected folder so the user should just press "Use this folder". The user can navigate away but will not be able to navigate back so you need to check he has selected Android/data by looking at ExernalStorage.Root.Name which should look like

content://com.android.externalstorage.documents/tree/primary%3AAndroid%2Fdata

You need to use the other ExternalStorage methods to access files and folders, the usual file methods will not work.
 

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agraham

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Slight bug in crude demo above. It doesn't appear to persist the permission because I commented out a line while testing. In Main.btnPickFolder_Click un-comment the commented call

Storage.SelectDir(chkUsePreviouslySelected.Checked)

and delete the following line passing False.
 
Last edited:
aidymp

aidymp

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agraham said:
Slight bug in crude demo above. It doesn't appear to persist the permission because I commented out a line while testing. In Main.btnPickFolder_Click un-comment the commented call

Storage.SelectDir(chkUsePreviouslySelected.Checked)

and delete the following line passing False.
Click to expand...

Hi, I will look when the kids are in bed, so far in windows its still showing an empty folder, but it does look promising! I will keep you updated.
 
agraham

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It works on all three Android 11 and 12 devices I tried so far.

Starting the demo for the first time the screen will be an empty black File Picker with a white ImageView at the lower right. Pressing "Pick folder" should show an Android system screen with the contents of the data folder and a "Use this folder" button at the bottom. Press it and allow access in the dialog and it will return to the blank screen and after a delay (Storage Access Framework is a bit slow) show you all the folders in /data. You can now navigate those folders and if you select a jpg file it will display in the ImageView. Study the source code to see how it accesses files.

If you press "Pick folder" again with the CheckBox checked regardless of what is displaying it will return to the /data folder. Unchecking the Checkbox will ask again for access as it will not then use the persisted permission.
 
aidymp

aidymp

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agraham said:
It works on all three Android 11 and 12 devices I tried so far.

Starting the demo for the first time the screen will be an empty black File Picker with a white ImageView at the lower right. Pressing "Pick folder" should show an Android system screen with the contents of the data folder and a "Use this folder" button at the bottom. Press it and allow access in the dialog and it will return to the blank screen and after a delay (Storage Access Framework is a bit slow) show you all the folders in /data. You can now navigate those folders and if you select a jpg file it will display in the ImageView. Study the source code to see how it accesses files.

If you press "Pick folder" again with the CheckBox checked regardless of what is displaying it will return to the /data folder. Unchecking the Checkbox will ask again for access as it will not then use the persisted permission.
Click to expand...
Very promising, Im going to do the unthinkable, and update my Nvidia Shield to Android 11! As my tablet is currently with samsung, and my phone is locked to Android 10, And Windows subsystem for Android is being silly! But as soon as I can confirm it works I will pay as promised.
 
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