Android Question [Solved] Bug in my application (on the same device) if I change only targetSDK

[bernardR]

Hello,
I have an application no-google running on Android 10 with minSdkVersion=29 and targetSdkVersion=29.
If I put targetSdkVersion = 30, it no longer works on the same Android 10 device.
Why ?
Is this an issue with AppCompat?

Here are some details:
B4A version=11.20
platform SDK=30
used device: Redmi 8 with Android 10
SetApplicationAttribute(android:requestLegacyExternalStorage, true) in manifest
PERMISSION_WRITE_EXTERNAL_STORAGE=true

Here is the buggy code:

Sub Process_Globals
    Private ApiAndroid As Int
End Sub

Sub Globals
    Private wv As WebView
End Sub

Sub Activity_Create(FirstTime As Boolean)
    wv.Initialize("wv")
    Activity.AddView(wv,0,0,100%x,100%y)
    wv.Color=Colors.White
    wv.Visible=True
 
    Dim r As Reflector
    ApiAndroid=r.GetStaticField("android.os.Build$VERSION","SDK_INT")

    Dim rp As RuntimePermissions
    Log("ApiAndroid=" & ApiAndroid & " : Requesting WRITE_EXTERNAL_STORAGE permission")
    rp.CheckAndRequest(rp.PERMISSION_WRITE_EXTERNAL_STORAGE) ' Implicit read capability if granted

    Wait For Activity_PermissionResult (Permission As String, Result As Boolean)
    Log($"${Permission} = ${Result}"$)

    Dim mystorage As String="/storage/emulated/0"
    Dim txtHtml As String=$"<img src="${mystorage}/mydir/1.jpg"/>"$
    wv.LoadHtml(txtHtml)
    Log(txtHtml)
End Sub

Internal storage name: storage/emulated/0
Folder at the root of internal memory: /mydir
picture in /mydir: 1.jpg

Purpose: display an image
Bug:
The 1.jpg image is displayed on my Redmi with targetSdkVersion = 29
It is not displayed on the same device if targetSdkVersion = 30

I have isolated the problem below in a small app

Thank-you for your help

 

[Ivica Golubovic]

Try to replace:

Dim mystorage As String="/storage/emulated/0"

With

Dim mystorage As String=File. DirRootExternal

 

[agraham]

No, it's a change in permissions with targeting SDK30. See 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

If it's not to go in the Play Store see here

Manage External Storage - access internal external storage >= SDK 30

Google seems intent on dumbing down Android to the point of uselessnes to me. I think of my devices as little computers and I want a proper file system on them, not the limited tortuous things that Google offers and that I don't understand, ContentChooser, FileProvider, ... o_O I'm getting old...

www.b4x.com

Otherwise see here

SaveAs - Let the user select a target folder + list of other related methods

B4A + B4i example: https://www.b4x.com/android/forum/threads/b4x-texteditor-save-and-load-external-files.132731/#post-838166 List of classes or libraries that can be used to access secondary storages: ContentChooser (Phone libray) - allows the user to select a resource or file using external...

www.b4x.com

 

[bernardR]

Try to replace:

Dim mystorage As String="/storage/emulated/0"

With

Dim mystorage As String=File. DirRootExternal

same bug

 

[agraham]

Not a bug. See my post.

 

[bernardR]

I use your class ManageExternalStorage if apiAndroid=30; but ManageExternalStorage works on android 11, but not on android 10.
I wish my app to work on android 10 and android 11.

 

[Ivica Golubovic]

Can you post error code

 

[bernardR]

Can you post error code

No error code. Image not displayed

 

[agraham]

I wish my app to work on android 10 and android 11.

Sorry but I don't know how to do that. My own apps, that are not for the Play Store, either target SDK 28 to run on Android 10 and 11 or target SDK 30 and use ManageExternalStorage to run on Android 11 only/

 

[Ivica Golubovic]

Ok, then try to use file URI instead file path in WebView

 

[bernardR]

Sorry but I don't know how to do that. My own apps, that are not for the Play Store, either target SDK 28 to run on Android 10 and 11 or target SDK 30 and use ManageExternalStorage to run on Android 11 only/

If you use target SDK 28, can you read un external storage on device android 11 ?

 

[bernardR]

Ok, then try to use file URI instead file path in WebView

same probleme
Have you an example?

 

[agraham]

If you use target SDK 28, can you read un external storage on device android 11 ?

Yes. PERMISSION_WRITE_EXTERNAL_STORAGE works as expected if you target SDK 28 or lower. Also works on Android 12.

 

[Ivica Golubovic]

Read Additional information from post:
Post in thread 'UltimateWebView Custom View' https://www.b4x.com/android/forum/threads/ultimatewebview-custom-view.135666/post-861654

 

[bernardR]

Thank you Ivica,
I saw in your library the option setAllowFileAccess.
This allowed me to solve my problem by drawing inspiration from:
https://www.b4x.com/android/forum/t...-with-targetsdkversion-30.132367/#post-835766

 

[Ivica Golubovic]

Thank you Ivica,
I saw in your library the option setAllowFileAccess.
This allowed me to solve my problem by drawing inspiration from:
https://www.b4x.com/android/forum/t...-with-targetsdkversion-30.132367/#post-835766

You are welcome.