Xamrin Forms: How to read the details of a file stored in device's external storage?

Question

I have implemented creating a folder and file in the device's external storage and writing data into that file using this thread.

Now I am trying to get the details of the file. For that, I have added a new function in the interface like below.

//Interface
public interface IAccessFile
{
    void CreateFile(string text);
    Java.IO.File GetFileDetails();
}

//Android implementation
public Java.IO.File GetFileDetails()
{
    string rootPath = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath;
    var filePathDir = Path.Combine(rootPath, "StockPDT");
    if (File.Exists(filePathDir))
    {
        string filePath = Path.Combine(filePathDir, "STOCK.TXT");
        Java.IO.File file = new Java.IO.File(filePath);
        return file;
    }
    else
    {
        return null;
    }
}

But the problem is with the interface function part, getting below error":

The type or namespace name 'Java' could not be found (are you missing a using directive or an assembly reference?)

Screenshot:

If I return the file from the android part like above, it is easy to get the file details in the portable project. Instead of File, I try to return the file path, but it is empty. Is there any other way to get the file details other than this?

Are you putting the interface and the implementation in the same project? — heinst, Mar 18 '21 at 06:44
@heinst The interface is in the main project(.net project) and implementation is on the android project. — Sreejith Sree, Mar 18 '21 at 08:07
That’s where your problem was. you can only reference Android types, methods, etc in an Android specific project — heinst, Mar 18 '21 at 16:22

score 0 · Accepted Answer · answered Mar 18 '21 at 11:47

As per the notes in question, I tried to fetch the file details using its path.

Reference: https://learn.microsoft.com/en-us/answers/questions/319908/xamrin-forms-how-to-read-the-details-of-a-file-sto.html

//Interface
public interface IAccessFile
{
    string GetFileDetails();
}

//Android implementation
public string GetFileDetails()
{
    string rootPath = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath;
    var filePathDir = Path.Combine(rootPath, "StockPDT");
    if (!File.Exists(filePathDir))
    {
        Directory.CreateDirectory(filePathDir);
    }
    string filePath = Path.Combine(filePathDir, "STOCK.TXT");
    return filePath;
}

//Main Project:
string path = DependencyService.Get<IAccessFile>().GetFileDetails();
string fileDetails = File.ReadAllText(path);

Xamrin Forms: How to read the details of a file stored in device's external storage?

1 Answers1