Android Question polyline from kml to txt

arnold steger · Oct 15, 2015

I need help for this question.
Want parse a kml file and maked from any Polyline a txt file.
I have a problem when want finde a name for separatly the polyline and convert my string whit all my latlon in a list.
step 1
read file, in <td> is my name (273, second polyline 274) for my filename
step 2
convert <coordinates> in a list and saved as txt-file

I dont finde a way to read the data <td> and <coordinates>
I need Text as Double for write any latlon in a list
in my compled kml file are 300 polyline to convert.

B4X:

Sub Globals
    Dim TempName,TempAllCoords,TempCoords As String
    Dim TempAllList,SafeList As List
   
End Sub
Sub Parser_EndElement (Uri As String, Name As String, Text As StringBuilder)
    If parser.Parents.IndexOf("Document") > -1 Then
        If Name="td" Then
        TempName=Text.ToString
        End If
      
        If Name = "coordinates" Then
        SafeList.Initialize
        TempAllCoords=Text.ToString
        TempCoords=TempAllCoords.Replace("0 ","")
        Dim PolygonCoords1 () As Double=Array As Double(TempCoords) 'to convert string to double
        Dim PolygonPoints1 As List=CoordsToLatLngList1(PolygonCoords1)
        For i = 1 To PolygonPoints1.Size-1
        Dim PointsTemp() As String = Regex.Split(",",PolygonPoints1.Get(i))
            Dim ln As LatLng
            ln.Initialize(PointsTemp(0),PointsTemp(1))
            SafeList.Add(ln)
        Next
      
        Dim Writer As TextWriter
        Writer.Initialize(File.OpenOutput(File.DirRootExternal & "/Grenzen",TempName&".txt",True))
        Writer.WriteList(SafeList)
        Writer.Close
        End If  
    End If
  
End Sub

Sub CoordsToLatLngList1(PolygonCoords1() As Double) As List
    Dim PolygonCoords1Count As Int=PolygonCoords1.Length
    Dim LatLngList1 As List
    LatLngList1.Initialize

Erel · Oct 15, 2015

Note that you should almost never use TextWriter. Just call File.WriteList if you want to write a list of text items.

Do you want to get the name from one of these fields?

eurojam · Oct 15, 2015

Arnold,
you can use the xmlsax library, which makes it easier to read kml, which is xml:

B4X:

ub Process_Globals
    Dim parser As SaxParser
End Sub

Sub Globals
    Dim coords As String
End Sub

Sub Activity_Create(FirstTime As Boolean)
    If FirstTime Then
        parser.Initialize
    End If
    'parse the xml file
    Dim in As InputStream
    in = File.OpenInput(File.DirAssets, "kml.txt")
    parser.Parse(in, "Parser")
    in.Close
End Sub
Sub Parser_EndElement (Uri As String, Name As String, Text As StringBuilder)
    'Log(Name)
    If parser.Parents.IndexOf("Polygon") > -1 Then
        If Name = "coordinates" Then
            coords = Text.ToString
            Log(coords)
        End If
    End If
End Sub

arnold steger · Oct 15, 2015

I have tested this code. When build latlon from string show error.
line: LatLng1.Initialize(PolygonCoords1(i), PolygonCoords1(i+1))

** Activity (main) Create, isFirst = true **

Error occurred on line: 89 (main)
java.lang.NumberFormatException: Invalid double: "11.7406864345806,46.665959060293,11.7404485709996,46.6660862601944 and more....
Message longer than Log limit (4000). Message was truncated.

B4X:

Sub Parser_EndElement (Uri As String, Name As String, Text As StringBuilder)
    If parser.Parents.IndexOf("Document") > -1 Then
        If Name="SimpleData" Then
            If NameCount=0 Then
            TempName=Text.ToString
            End If
            If NameCount=7 Then
            TempName=TempName&"_"&Text.ToString
            End If
        NameCount=NameCount+1
        End If
      
        If Name = "coordinates" Then
        SafeList.Initialize
        TempAllCoords=Text.ToString
        TempCoords=TempAllCoords.Replace("0 ","")
        TempAllList.Initialize
        TempAllList=Regex.Split(",",TempCoords)      
      
        Dim PolygonCoords1 () As String=Array As String(TempCoords)
        Dim PolygonPoints1 As List=CoordsToLatLngList1(PolygonCoords1)
        For i = 1 To PolygonPoints1.Size-1
        Dim PointsTemp() As String = Regex.Split(",",PolygonPoints1.Get(i))
            Dim ln As LatLng
            ln.Initialize(PointsTemp(0),PointsTemp(1))
            SafeList.Add(ln)
        Next
      
        File.WriteList(File.DirRootExternal& "/Grenzen",TempName&".txt",SafeList)
        ListView1.AddSingleLine(TempName)
        NameCount=0
        End If
    End If
  
End Sub

Sub CoordsToLatLngList1(PolygonCoords1() As String) As List

    Dim LatLngList1 As List
    LatLngList1.Initialize
    Dim i As Int
    For i=0 To TempAllList.Size/2 Step 2
        Dim LatLng1 As LatLng
        LatLng1.Initialize(PolygonCoords1(i), PolygonCoords1(i+1))
        LatLngList1.Add(LatLng1.Longitude&LatLng1.Latitude)
    Next
    Return LatLngList1
End Sub

eurojam · Oct 15, 2015

try

B4X:

Sub Parser_EndElement (Uri As String, Name As String, Text As StringBuilder)
    'Log(Name)
    If parser.Parents.IndexOf("Document") > -1 Then
        If Name = "coordinates" Then
            Dim l, cl As List
            cl.Initialize
            l.Initialize
            coords = Text.ToString
            coords = coords.Replace("0 ","")
            Log(coords)
            l = Regex.Split(",",coords)
            Log(l)
            For i=0 To l.Size/2 Step 2
                Dim ll As LatLng
                ll.Initialize(l.Get(i), l.Get(i+1))
                cl.Add(ll)
               
            Next
            Log (cl)
        End If
    End If

End Sub

arnold steger · Oct 15, 2015

You are the best. Thanks
This code work perfectly.

B4X:

Sub Globals
    Dim ListView1 As ListView
    Dim TempName,TempAllCoords,TempCoords As String
    Dim TempAllList,SafeList As List
    Dim NameCount As Int
End Sub
Sub Parser_EndElement (Uri As String, Name As String, Text As StringBuilder)
    If parser.Parents.IndexOf("Document") > -1 Then
        If Name="SimpleData" Then
            If NameCount=0 Then
            TempName=Text.ToString
            End If
            If NameCount=7 Then
            TempName=TempName&"_"&Text.ToString
            End If
        NameCount=NameCount+1
        End If
       
        If Name = "coordinates" Then
        SafeList.Initialize
        TempAllCoords=Text.ToString
        TempCoords=TempAllCoords.Replace("0 ","")
        TempAllList.Initialize
        TempAllList=Regex.Split(",",TempCoords)       
       
        For i=0 To TempAllList.Size/2 Step 2
        Dim ln As LatLng
        ln.Initialize(TempAllList.Get(i+1),TempAllList.Get(i))
        SafeList.Add(ln.Latitude&","&ln.Longitude&",")
        Next
       
        File.WriteList(File.DirRootExternal& "/Grenzen",TempName&".txt",SafeList)
        ListView1.AddSingleLine(TempName)
        NameCount=0
        End If
    End If
   
End Sub

Android Question polyline from kml to txt

arnold steger

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Erel

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eurojam

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Android Question polyline from kml to txt

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