Android Question Using correctly File.WriteList

[GiovanniPolese]

Hi.
My problem is to write on disk various Lists, in sequence, on same file. The saving sequence is:

    File.Delete(InternalWorkDir,FileUndo)
    File.WriteList(InternalWorkDir,FileUndo,Layers)
    File.WriteMap(InternalWorkDir,FileUndo,colorMap)
    b=rvs.ConvertObjectToBytes(layerMap.Size) ' just an integer
    File.WriteBytes(InternalWorkDir,FileUndo,b)

The list, the map and the integer are saved with no error. But when I try to load the data with:

    Layers.Initialize ' not sure if necessary
    Layers=File.ReadList(InternalWorkDir,FileUndo)
     colorMap=File.ReadMap(InternalWorkDir,FileUndo)
    b=File.ReadBytes(InternalWorkDir,FileUndo)
    size=rvs.ConvertBytesToObject(b)

I don't find the same data, actually I find nothing. If I just save and reload the first list, it works. It seems that wrtiting destroys previous data. So I am missing something, of course. Using TextWriter is out of question, because, besides the above list and map, I have much more data to save, in other maps and atrays, and the process will be intolerably slow. I successfully did the process with RandomAccesFile, but it is too slow on huge data. Something working faster than RandomAccesFile is necessary.
Thanks for any hint

 

[LucaMs]

Those commands do not have an "append" so what you would like to do is not possible. Who knows why you want everything to be in a single file or, better yet, what the problem is in having multiple files.

You should probably use a SQLite file.