Android Question google service framework id (how to get it?)

#Region Shared Files
#CustomBuildAction: folders ready, %WINDIR%\System32\Robocopy.exe,"..\..\Shared Files" "..\Files"
'Ctrl + click to sync files: ide://run?file=%WINDIR%\System32\Robocopy.exe&args=..\..\Shared+Files&args=..\Files&FilesSync=True
#End Region

#If JAVA
public String getGsfAndroidId(Context context)
{
    Uri URI = Uri.parse("content://com.google.android.gsf.gservices");
    String ID_KEY = "android_id";
    String params[] = {ID_KEY};
    Cursor c = context.getContentResolver().query(URI, null, null, params, null);
    if (!c.moveToFirst() || c.getColumnCount() < 2)
        return null;
    try
    {
        return Long.toHexString(Long.parseLong(c.getString(1)));
    }
    catch (NumberFormatException e)
    {
        return null;
    }
}
#End If

'Ctrl + click to export as zip: ide://run?File=%B4X%\Zipper.jar&Args=Project.zip

Sub Class_Globals
    Private Root As B4XView
    Private xui As XUI
End Sub

Public Sub Initialize
End Sub

'This event will be called once, before the page becomes visible.
Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    Root.LoadLayout("MainPage")
End Sub

Sub Button1_Click
    xui.MsgboxAsync(getGsf, "B4X")
End Sub

Private Sub getGsf As String
    Dim jo As JavaObject = Me
    Dim str As String = jo.RunMethod("getGsfAndroidId", Null)
    Return str
End Sub