/// <inheritdoc />
/// <summary>
/// Load the contents of the file from the Android file system. Uses
/// the async .NET APIs for reading bytes from a file.
/// </summary>
/// <returns></returns>
public virtual async Task <int> ReadFileAsync(IGenerateNameOfFile fileName)
{
var backingFile = fileName.GetAbsolutePathToFile(DefaultFilename);
if (backingFile == null || !File.Exists(backingFile))
{
return(0);
}
var count = 0;
using (var reader = new StreamReader(backingFile, true))
{
string line;
while ((line = await reader.ReadLineAsync()) != null)
{
if (int.TryParse(line, out var newcount))
{
count = newcount;
}
}
}
return(count);
}
public static string ReadFile(IGenerateNameOfFile filePath, string fileName)
{
string backingFile = filePath.GetAbsolutePathToFile(fileName);
if (backingFile == null || !File.Exists(backingFile))
{
return(string.Empty);
}
return(File.ReadAllText(backingFile));
}
public static void WriteFile(IGenerateNameOfFile filePath, string fileName, string json)
{
string backingFile = filePath.GetAbsolutePathToFile(fileName);
if (backingFile == null)
{
return;
}
File.WriteAllText(backingFile, json);
}
/// <summary>
/// Writes the number to a text file using the async
/// .NET APIs for write the contents to the filesystem.
/// </summary>
/// <param name="fileName">The name (but not the path) of the text file that will be written to.</param>
/// <param name="count">A number that will be written to a text file.</param>
/// <returns></returns>
public virtual async Task WriteFileAsync(IGenerateNameOfFile fileName, int count)
{
var backingFile = fileName.GetAbsolutePathToFile(DefaultFilename);
if (backingFile == null)
{
// For reasons beyond the control/responsibilty of this class,
// there is no path to the backing storage file. Don't do anything.
return;
}
using (var writer = File.CreateText(backingFile))
{
await writer.WriteLineAsync(count.ToString());
}
}
/// <summary>
/// Resets the count to zero and will delete the backing text file.
/// </summary>
/// <param name="filename"></param>
public Task DeleteFileAsync(IGenerateNameOfFile filename)
{
Count = 0;
return(Task.Run(() => { File.Delete(filename.GetAbsolutePathToFile(DefaultFilename)); }));
}
/// <summary>
/// Will display th name of the backing text file in the specified TextView.
/// </summary>
/// <param name="fileName"></param>
/// <param name="view"></param>
public void DisplayPathIn(IGenerateNameOfFile fileName, TextView view)
{
view.Text = fileName.GetAbsolutePathToFile(DefaultFilename);
}