Question

I am having a lot of trouble in working with streams using monodroid. What I am trying to do is simply download a file using a URL and saving it to my phone’s /sdcard location but am having problems. I am getting Access to the path ‘/mnt/sdcard’ is denied.

Code :-

Filestream strlocal;
var fileName = Android.OS.Environment.ExternalStorageDirectory;
string path = Convert.ToString(fileName);
strLocal = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Write);

• When I debug the app and try to run it on my device, the debugging error points at this line of code.

In Visual Studio, I have made the manifest file using the dialog in properties in which I have given permission to write, i.e :-

uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE

Also , i Tried another approach to write this permission in the main activity page, i.e :-

[Activity(Label = "MonoAndroidApplication2", MainLauncher = true, 
Permission = "android.permission.WRITE_EXTERNAL_STORAGE")

But still getting the same error of denial. Also when I make the manifest file in visual studio, I get strange messages like:-

Message 5   Could not find schema information for the element 'uses-permission'.    

Message 1   Could not find schema information for the element 'manifest'.

Message 2   Could not find schema information for the attribute 'package'.

What do these messages mean?. Please help me in this problem.

I am using the latest version of Monodroid (Bought it a week ago)

Answer 1

The problem is that you’re trying to open the FileStream using the folder’s path, rather than specifying a file name within that folder. For example:

string path = Path.Combine(Android.OS.Environment.ExternalStorageDirectory.Path, "MyFile.txt");

using (var stream = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Write))
{
    // write stuff
}

This will create a file named MyFile.txt in the external storage folder.