Android Question Initialize fields and some basic questions

'Class module "clsSettings"
Sub Class_Globals
    Private mDir As String
    Private mSettingsFile As String  
    Private mSettings As Map
End Sub

'Initializes the object. You can add parameters to this method if needed.
Public Sub Initialize(settingsDir as String, settingsFile as String)
  
    mDir = settingsDir
    mSettingsFile = settingsFile   
    mSettings.Initialize
  
    mSettings.Put("Param1", "Default Value 1")
    mSettings.Put("Param2", "Default Value 2")
End Sub

Public Sub setParameter1(val as String)
    mSettings.Put("Param1", val)
End Sub

Public Sub getParameter1() As String
    Return mSettings.Get("Param1")
End Sub

Public Sub setParameter2(val as String)
    mSettings.Put("Param2", val)
End Sub

Public Sub getParameter2() As String
    Return mSettings.Get("Param2")
End Sub

Public Sub readSettings
     
    If File.Exists(mDir, mSettingsFile) Then
        mSettings= File.ReadMap2(mDir, mSettingsFile, mSettings)
    End If
  
End Sub

Public Sub writeSettings
    File.WriteMap(mDir, mSettingsFile, mSettings)
End Sub
'==================================================

'Starter Service
Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
  
    Public cSettings As clsSettings  
End Sub

Sub Service_Create
    'This is the program entry point.
    'This is a good place to load resources that are not specific to a single activity.
    cSettings.Initialize(File.DirInternal, "settings.ini")
 
End Sub
'=====================================================

'Main Activity
Sub Activity_Create(FirstTime As Boolean)
  
    [...]
  
    Starter.cSettings.readSettings
    Log(Starter.cSettings.Parameter1)
    Starter.cSettings.Parameter1 = "New Value"
    Starter.cSettings.writeSettings

End Sub

Sub Globals
    'These global variables will be redeclared each time the activity is created.
    'These variables can only be accessed from this module.
    Private txtNameCam1 As EditText
 End Sub

Dim SettingsMap1 As Map
    SettingsMap1.Initialize
    SettingsMap1.Put("NameCam1",txtNameCam1)
    File.WriteMap(File.DirInternal, "Settings.ini", SettingsMap1)

Dim SettingsMap1 As Map
    SettingsMap1.Initialize
    SettingsMap1.Put("NameCam1",txtNameCam1.Text)
    File.WriteMap(File.DirInternal, "Settings.ini", SettingsMap1)

SettingsMap1.Put("NameCam1",txtNameCam1.text)

SettingsMap1.Put("NameCam1",txtNameCam1)