Saving a file in shared storage Xamarin forms - xamarin.forms

Question

I need to save a file in the shared storage of android. I came across this link => https://developer.android.com/training/data-storage/shared/documents-files
I am using the dependency service and I am able to successfully save a file to desired location. But I am able to create only a blank file. I need to write some content into that file. Actually I created a thread few hours ago with android tag and got the solution where I had to override the OnActivityResult method and get the intent data. Now I have done it and I am able to get the intent data. But Now I dont know which path should i choose from the intent and how to open the file using the chosen path and how to write content into that chosen file. Any android + xamarin expert should be able to help me..
The android platform code to implement the write service:
Activity _activity;
private static int CREATE_FILE = 6835;
public WriteFileService()
{
_activity = CrossCurrentActivity.Current.Activity;
}
void IWriteService.WriteFile(string Content)
{
Intent intent = new Intent(Intent.ActionCreateDocument);
intent.AddCategory(Intent.CategoryOpenable);
intent.SetType("application/txt");
intent.PutExtra(Intent.ExtraTitle, "Invoice.txt");
_activity.StartActivityForResult(intent, CREATE_FILE);
}
The overriden OnActivityResultMethod:
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
Toast.MakeText(Application.Context, "requestCode is " + requestCode, ToastLength.Short).Show();
if (requestCode == 6835)
{
if (data != null)
{
Toast.MakeText(Application.Context,
data.GetType().ToString(),
ToastLength.Short).Show();
}
}
base.OnActivityResult(requestCode, resultCode, data);
}
This is the screen of the Intent Data from OnActivityResult

Answer 1

Use this in your Android project to save a stream to file:
public async Task SaveAndView(string fileName, String contentType, MemoryStream stream)
{
try
{
string root = null;
//Get the root path in android device.
if (Android.OS.Environment.IsExternalStorageEmulated)
{
root = Android.OS.Environment.ExternalStorageDirectory.ToString();
}
else
root = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
//Create directory and file
Java.IO.File myDir = new Java.IO.File(root + "/meusarquivos");
myDir.Mkdir();
Java.IO.File file = new Java.IO.File(myDir, fileName);
//Remove if the file exists
if (file.Exists()) file.Delete();
//Write the stream into the file
FileOutputStream outs = new FileOutputStream(file);
outs.Write(stream.ToArray());
outs.Flush();
outs.Close();
}
catch (Exception ex)
{
PostLog.AppCenterLogExcecao(ex, new Dictionary<string, string> { { "origem", "OrderViewModel - 159" } });
}
}
And in your shared code:
await DependencyService.Get<ISave>().SaveAndView(OrderId.ToString() + ".pdf", "application/pdf", stream);
Be sure to ask for the permissions before using the code.

Answer 2

To save the file. ive used this code
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
if (requestCode == 6835)
{
if (data != null)
{
Android.Net.Uri uri = Android.Net.Uri.Parse(data.DataString);
var stream = ContentResolver.OpenOutputStream(uri, "w");
byte[] byteArray = Encoding.UTF8.GetBytes("Hi Thameem. I am your file.");
MemoryStream stream1 = new MemoryStream(byteArray);
stream1.CopyTo(stream);
stream.Flush();
stream.Close();
Toast.MakeText(Application.Context,
"The file has been exported successfully",
ToastLength.Short).Show();
}
}
base.OnActivityResult(requestCode, resultCode, data);
}