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Android Question File.DirRootExternal become not work

Discussion in 'Android Questions' started by Khairy Abdelhamid, Jul 8, 2019.

  1. Khairy Abdelhamid

    Khairy Abdelhamid Member Licensed User

    Dear Alls;

    From very long time, I use File.DirRootExternal without any problem.
    Now, I try to compile one of my project with same compile version but not work. It is abnormal.
    Even some function work like:
    File.Exists(File.DirRootExternal ,"abc.sqlite") = True work will
    SQL1.Initialize(File.DirRootExternal ,"abc.sqlite",True) not work and even not create file if i delete previous file.

    What happened with the compiler to make DirRootExternal not work

    I Added the following permissions in the Manifest file, but still DirRootExternal not work

    Please i hope to find, first what happened with the project ?
    and how can I solve to make DirRootExternal work right again with all function (like SQL.Ini...)

    Thanks in advance,
    Best regards
  2. Jeffrey Cameron

    Jeffrey Cameron Active Member Licensed User

  3. Khairy Abdelhamid

    Khairy Abdelhamid Member Licensed User

    Dear Mr. Jeffrey

    Really many thanks for your interest.

    I try with "GetSafeDirDefaultExternal" as in the link you sent

    It access the following link :
    " /storage/emulated/0/Android/data/com.test.ext.dir/files " where com.test.ext.dir is the project package name,

    But I need to access root directory i.e. /storage/emulated/0/

    I need to make two different application access same directory/files but in the above result the two applications will access different directly based on its package name

    note: if you create two different application to run on same mobile, them must take two different package names.

    Hope for find solution to access the main root of mobile i.e. /storage/emulated/0/

    best regards
  4. emexes

    emexes Well-Known Member Licensed User

    FWIW I just tried this and it seemed to work ok. Phone is running Android 7.0, B4A is 9.00, targetSdkVersion is 26 (ie unchanged default)
    Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:

    Dim PermissionsGoodFlag As Boolean = True
    If PermissionsGoodFlag Then
    Wait For Activity_PermissionResult (Permission As String, YaeOrNay As Boolean)
    If YaeOrNay = False Then
                PermissionsGoodFlag = 
    End If
    End If
    If PermissionsGoodFlag Then
    Wait For Activity_PermissionResult (Permission As String, YaeOrNay As Boolean)
    If YaeOrNay = False Then
                PermissionsGoodFlag = 
    End If
    End If
    Log("PermissionsGoodFlag = " & PermissionsGoodFlag)
    If PermissionsGoodFlag Then
    File.WriteString(File.DirRootExternal, "1.txt""This is the file in the root external directory")
    File.MakeDir(File.DirRootExternal, "khab")
    Dim KhabDir As String = File.DirRootExternal & "/khab"
    File.WriteString(KhabDir, "2.txt""This is the file in Khab's directory")
    Dim D As String = File.DirRootExternal
    Log("Dir = " & D)    
    Log("ReadString = " & File.ReadString(D, "1.txt"))
    Dim D As String = KhabDir
    Log("Dir = " & D)
    Log("ReadString = " & File.ReadString(D, "2.txt"))
    End If
    End Sub
    Project, Manifest Editor has two lines added at bottom:
    '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
    <uses-sdk android:minSdkVersion=
    "5" android:targetSdkVersion="26"/>
    <supports-screens android:largeScreens=
    CreateResourceFromFile(Macro, Themes.DarkTheme)
    'End of default text.
    Log is:
    Logger connected to:  TCL 5009A
    --------- beginning of main
    Service (starter) Create ***
    --------- beginning of system
    Service (starter) Start **
    Activity (main) Create, isFirst = true **
    Activity (main) Resume **
    Activity (main) Pause, UserClosed = false **
    sending message 
    to waiting queue (activity_permissionresult)
    running waiting messages (
    Activity (main) Resume **
    PermissionsGoodFlag = 
    Dir = /storage/emulated/
    ReadString = This 
    is the file in the root external directory
    Dir = /storage/emulated/
    ReadString = This 
    is the file in Khab's directory
    ** Activity (main) Pause, UserClosed = false **
    Tools, B4A Bridge, File Explorer is:


    (don't worry about the [1]'s in the file window title bars - that's just Windows letting you know that I did the procedure twice, to be sure, to be sure... ;-)
  5. Khairy Abdelhamid

    Khairy Abdelhamid Member Licensed User

    Dear Mr. emexes

    Really many thanks, it run with your code and support, thanks for you.
    And thanks for all replies for my question.

    best regards
  6. emexes

    emexes Well-Known Member Licensed User

    I had two gut reactions to this:

    1/ what?!?! did you have doubt that it would ?!?!?!
    2/ phew! (because, with computers being computers and Android being Android, it so easily might not have)


    ps thanks for the feedback confirming it worked - that'll give hope to other people who read this thread in the future when they are trying to solve the same or similar issue
    Herbert32 likes this.
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