public async Task WriteFileOnInternalStorage(Context mcoContext, string fileName, string content)
{
var dir = new File(mcoContext.FilesDir, "");
if (!dir.Exists())
{
dir.Mkdir();
}
var gpxfile = new File(dir, fileName);
var writer = new FileWriter(gpxfile);
await writer.AppendAsync(new String(content));
await writer.FlushAsync();
writer.Close();
}