how can set file to hidden and show

Question

I will create a folder to download the audio file, but I do not want the user to be able to access those files on their mobile phone. I just want it to be played through the app

Answer 1

Hello,

Welcome to our Microsoft Q&A platform!

There are two ways to do ,using Internal Storage or setting the file hidden.

Internal Storage– this is a portion of the file system that can be accessed only by the application or the operating system.
I save a text file, you could refer to the following code

protected override void OnAppearing()  
        {  
            base.OnAppearing();  
            String str = "123456";//test  
            Byte[] byteArray = System.Text.Encoding.Default.GetBytes(str);  
            string fileName = "test.txt";  
            string documentPath = FileSystem.CacheDirectory;  
            string path = Path.Combine(documentPath, fileName);  
            File.WriteAllBytes(path, byteArray);  
        }  

Create a hidden folder simply by adding a '.' to the front of the folder name.
I save the test.text file by External Storage , you could reder to the following code

 private void Button_Clicked(object sender, EventArgs e)  
            {  
                String str = "123456";//test  
                Byte[] byteArray = System.Text.Encoding.Default.GetBytes(str);  
                string fileName = "test.txt";  
                String testPath = DependencyService.Get<PathService>().GetPath();  
                var folderPath = testPath + "/.test";  
                if (!Directory.Exists(folderPath))//creat a folder to save  
                {  
                    DirectoryInfo dirInfor = new DirectoryInfo(folderPath);  
                    dirInfor.Create();  
                }  
                var filePath = System.IO.Path.Combine(folderPath, fileName);  
                File.WriteAllBytes(filePath, byteArray);  
            }  

use DependencyService to get path

public interface PathService  
    {  
        String GetPath();  
    }  

Android

[assembly: Dependency(typeof(PathServiceAndroid))]  
namespace AndroidStrogeDemo.Droid  
{  
    public class PathServiceAndroid : PathService  
    {  
        public string GetPath()  
        {  
            string testPath = Android.App.Application.Context.GetExternalFilesDir("").AbsolutePath;  
            return testPath;  
        }  
    }  
}  

permission

 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>  
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>  

However, you want to save video, internal storage directories tend to be small , your app should query the free space on the device before writing app-specific files to internal storage. If you create a hidden folder, user still can set "Don't show hidden files" or "Show hidden files". There is not a perfect way to do this, because this is the feature of Android.

Best Regards,
Wenyan Zhang

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