Android Question Generating JSON and MAP Problems

Dim data As List
    data.Initialize   
    For xx = 0 To 10' Contactz.Size-1
        Dim map1 As Map
        map1.Initialize
        map1.Put("name",xx)
        map1.Put("mobile",xx)
        data.InsertAt(xx,map1)
    Next
   JSONGenerator.Initialize2(data)
    Log (JSONGenerator.ToPrettyString(1))

    Map1.Clear
    For xx = 0 To 10' Contactz.Size-1
        Dim Map1 As Map
        Map1.initialize
        Map1.Put("name",xx)
        Map1.Put("mobile",xx)
        Data.InsertAt(xx,Map1) 
    Next
   JSONGenerator.Initialize2(Data)
   Log (JSONGenerator.ToPrettyString(1))

Data.Clear
 For xx = 0 To 10' Contactz.Size-1
        Data.Add(CreateMap("name": xx, "mobile": xx))
    Next
   JSONGenerator.Initialize2(Data)
   Log (JSONGenerator.ToPrettyString(1))

    Dim Data As List
    Data.Initialize

    For i = 0 To 10
        Data.Add(CreateMap("name": i, "mobile": i))
    Next

    Dim JSONGenerator As JSONGenerator
    JSONGenerator.Initialize2(Data)
    Log (JSONGenerator.ToPrettyString(4))

Dim parser As JSONParser
parser.Initialize(<text>)
Dim root As List = parser.NextArray
For Each colroot As Map In root
    Dim name As Int = colroot.Get("name")
    Dim mobile As Int = colroot.Get("mobile")
Next