Android Question Problem using RandomAcessFile 2.33

[Roberto M. de Oliveira]

My program normally compiles on a Windows 7 32-bit PC, version B4A 9.80.
On a new PC, windows 10 32 bits, I installed the B4A 10.00, according to the installation guidance.
When I compiled the program, the problem described below occurr:

The compilation runs ok! and used AndroidX SDK.

When I run the program an error occurs when reading files (i'm using randomacessfile 2.33, encrypted object). All registers return empty!

'**********************************************************************************************
' Tratamento de arquivos - Leitura e Gravação
'*********************************************************************************************
Sub LerArquivo(Dados As List,Senha As String,Arquivo As String)
    Dados.Initialize
    RAF.Initialize(File.DirRootExternal, Arquivo, False)
    Dados=RAF.ReadEncryptedObject(Senha, RAF.CurrentPosition)
    RAF.Close
End Sub

Sub GravarArquivo(Dados As List,Senha As String,Arquivo As String)
    RAF.Initialize(File.DirRootExternal, Arquivo, False)
    RAF.WriteEncryptedObject(Dados,Senha, RAF.CurrentPosition)
    RAF.Close
End Sub

Can anyone help solve this bug?

 

[DonManfred]

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

Runtime Permissions (Android 6.0+ Permissions)

1. Edit: In B4XPages the permission result event signature is: Wait For B4XPage_PermissionResult (Permission As String, Result As Boolean) 2. Important to read: https://www.b4x.com/android/forum/threads/android-jar-targetsdkversion-minsdkversion.87610/#content If the targetSdkVersion is...

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[Roberto M. de Oliveira]

Hi!, Don

Ok! Thanks your faster answer!

I never run the program under AndroidX SDK.

'This code will be applied to the manifest file during compilation.
'You do not need to modify it in most cases.
'See this link for for more information: https://www.b4x.com/forum/showthread.php?p=78136
AddManifestText(
<uses-sdk android:minSdkVersion="26" android:targetSdkVersion="28"/>
<supports-screens android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:anyDensity="true"/>)
SetApplicationAttribute(android:icon, "@drawable/icon")
SetApplicationAttribute(android:label, "$LABEL$")
CreateResourceFromFile(Macro, Themes.DarkTheme)
'End of default text.

I included all permissions for files matter:

    'Solicitação de acesso à memoria
    RP.CheckAndRequest(RP.PERMISSION_READ_EXTERNAL_STORAGE)
    Wait For Activity_PermissionResult (Permission As String, Result As Boolean)
    If Permission = RP.PERMISSION_READ_EXTERNAL_STORAGE Then Log("PERMISSION_READ_EXTERNAL_STORAGE = " & Result)
    RP.CheckAndRequest(RP.PERMISSION_WRITE_EXTERNAL_STORAGE)
    Wait For Activity_PermissionResult (Permission As String, Result As Boolean)
    If Permission = RP.PERMISSION_WRITE_EXTERNAL_STORAGE Then Log("PERMISSION_WRITE_EXTERNAL_STORAGE = " & Result)

Have you any other suggestion?

 

[Erel]

Moved to the questions forum.

It is enough to check for the WRITE permission.

It has nothing to do with AndroidX SDK.

It is a mistake to use File.DirRootExternal in almost all cases. Why not use File.DirInternal?

Other than that, RAF works exactly as before.

 

[Roberto M. de Oliveira]

I did one more test on the program and changed it to use the files (core) structure.

The program started to work normally, but I would like to use encryption.

Can this answer the problem?

 

[DonManfred]

You should start a new thread for a new Question.