Android Question Change volume ringtone

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
    Dim rt,jo, jo2 As JavaObject
    Dim u As Uri
    Dim rm As RingtoneManager
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.

End Sub

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
    'Activity.LoadLayout("Layout1")
    rt = getRingtone
    Activity.LoadLayout("ringtone")
    PlayRingtone
End Sub

Sub Activity_Resume
End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

Sub getRingtone As JavaObject
    jo.InitializeStatic("android.media.RingtoneManager")
    jo2.InitializeContext
    Dim u As Uri
    u.Parse(rm.GetDefault(rm.TYPE_ALARM))
    'u.Parse()
    Dim rt As JavaObject
    rt.InitializeContext
    rt = jo.RunMethodJO("getRingtone", Array(jo2, u))
    Return rt
End Sub

Sub PlayRingtone
    rt.RunMethod("play", Null)
End Sub

Sub StopRingtone
    rt.RunMethod("stop", Null)
End Sub

Sub Stopmelding_Click
    StopRingtone
    Activity.Finish
End Sub