Android Question Problem accessing the path returned by GetSafeDirDefaultExternal on Android 4.2.2 - SDK 17

[energypf]

I am testing my App on a device with Android 4.2.2 - SDK 17, but unfortunately when I run this code it goes into error.

With this code I get the error

Sub Process_Globals
    Public kvs As KeyValueStore
End Sub

Sub Activity_Create(FirstTime As Boolean)
    If FirstTime Then
        kvs.Initialize(rp.GetSafeDirDefaultExternal(""),"userconfig")
    End If
End Sub

With this code it works correctly

Sub Process_Globals
    Public kvs As KeyValueStore
End Sub

Sub Activity_Create(FirstTime As Boolean)
    If FirstTime Then
        kvs.Initialize(File.DirInternal,"userconfig")
    End If
End Sub

rp.GetSafeDirDefaultExternal("")

return:
"/storage/emulated/0/Android/data/<packname>/files"

File.DirInternal

return:
"/data/user/0/<packname>/files"

Error occurred on line: 12 (KeyValueStore)
android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:341)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:238)
at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:515)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:207)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:178)
at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:875)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:843)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:696)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:671)
at anywheresoftware.b4a.sql.SQL.Initialize(SQL.java:44)
at refertionline.rbsoft.com.keyvaluestore._initialize(keyvaluestore.java:59)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:348)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:146)
at refertionline.rbsoft.com.main.afterFirstLayout(main.java:105)
at refertionline.rbsoft.com.main.access$000(main.java:17)
at refertionline.rbsoft.com.main$WaitForLayout.run(main.java:83)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5365)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(Native Method)

What can I do to manage this on some older devices?

 

[agraham]

I think your thread title is misleading. The file paths look OK to me, the problem appears to be with KVS. Check if you can read and write a test file to those paths using normal File operations.

 

[Mahares]

What can I do to manage this on some older devices?

what does your manifest code show?

 

[energypf]

I think your thread title is misleading. The file paths look OK to me, the problem appears to be with KVS. Check if you can read and write a test file to those paths using normal File operations.

You're right, I corrected the title. However it fails to write to the path that GetSafeDirDefaultExternal returns.
What is advisable to do in these cases?
That is, should you do a writing test on the GetSafeDirDefaultExternal folder and if it fails to use the File.DirInternal?
Of course it is a bit embarrassing that GetSafeDirDefaultExternal (which should return a path that allows you to write without permissions) instead returns an inaccessible path.

 

[agraham]

Have you tried File.DirDefaultExternal? It should be the same path as GetSafeDirDefaultExternal("") but who knows!

Also have you tried writing a test file using File operations as I suggested?

 

[energypf]

File.DirDefaultExternal and GetSafeDirDefaultExternal ("") return the same path.
I noticed one thing, however, that invoking File.DirDefaultExternal before using kvs.Initialize(File.DirInternal,"userconfig") not generate an error when writing the value.

Sub Process_Globals
    Public kvs As KeyValueStore
End Sub

Sub Activity_Create(FirstTime As Boolean)
    If FirstTime Then
        Log(File.DirDefaultExternal)
        kvs.Initialize(File.DirInternal,"userconfig")
    End If
End Sub

The problem is that using File.DirDefaultExternal activates the "android.permission.WRITE_EXTERNAL_STORAGE *" permissions list which could cause Google to reject it.

 

[energypf]

This is the error that occurs when trying to write a simple file.

        Dim raf As RandomAccessFile
        raf.Initialize(rp.GetSafeDirDefaultExternal(""), "userconfig", False)
        raf.WriteInt ( 1 , raf.CurrentPosition)
        raf.Close

Error occurred on line: 64 (Main)
java.io.FileNotFoundException: /storage/emulated/0/Android/data/<packagename>/files/userconfig: open failed: EACCES (Permission denied)
at libcore.io.IoBridge.open(IoBridge.java:416)
at java.io.RandomAccessFile.<init>(RandomAccessFile.java:118)
at anywheresoftware.b4a.randomaccessfile.RandomAccessFile.Initialize2(RandomAccessFile.java:103)
at anywheresoftware.b4a.randomaccessfile.RandomAccessFile.Initialize(RandomAccessFile.java:96)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at anywheresoftware.b4a.shell.Shell.runVoidMethod(Shell.java:777)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:354)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:146)
at refertionline.rbsoft.com.main.afterFirstLayout(main.java:105)
at refertionline.rbsoft.com.main.access$000(main.java:17)
at refertionline.rbsoft.com.main$WaitForLayout.run(main.java:83)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5365)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(Native Method)
Caused by: libcore.io.ErrnoException: open failed: EACCES (Permission denied)
at libcore.io.Posix.open(Native Method)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
at libcore.io.IoBridge.open(IoBridge.java:400)
... 23 more

 

[agraham]

I assume that you got KVS to work on File.DirInternal? If so then it looks to me like that particular device is denying access to File.DirDefaultExternal when it shouldn't.. Both paths should be readable/writeable. I'm out of ideas I'm afraid except to say that Android 4 is so ancient can't you just ignore it?

 

[energypf]

I assume that you got KVS to work on File.DirInternal? If so then it looks to me like that particular device is denying access to File.DirDefaultExternal when it shouldn't.. Both paths should be readable/writeable. I'm out of ideas I'm afraid except to say that Android 4 is so ancient can't you just ignore it?

Actually I could also ignore the error on this device and go without getting any other problems. I tried rightly in the forum to ask to see if for these versions of android it was recommended to use another method. Users will buy more modern devices.

 

[Mahares]

I could also ignore the error on this device and go without getting any other problems

Now that you exhausted your options, your best bet is to export a small project that reproduces the errors you encountered. I I surely hope that many of the remaining 106000 members have a device with 4.2.2 that can test it and report back. You should never give up in this forum.