Hi,
I'am trying to open a pdf file from other apps. Howewer from email attachment it doesn't work, my cursor is returning null.
Here is my code used to open file from intent.
`public class IntentHelper
{
private readonly MainActivity mainActivity;
public IntentHelper(MainActivity mainActivity)
{
this.mainActivity = mainActivity;
}
public void GetFilePathFromIntent()
{
if (Intent.ActionView.Equals(mainActivity.Intent.Action) && (mainActivity.Intent.Type?.Equals("application/pdf") ?? false))
{
var path = GetRealPathFromUri(Android.App.Application.Context, mainActivity.Intent.Data);
//TODO -- Implement try catch
App.LoadPdf(path);
}
}
public static string GetRealPathFromUri(Context context, Android.Net.Uri uri)
{
bool isKitKat = Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.Kitkat;
// DocumentProvider
if (isKitKat && Android.Provider.DocumentsContract.IsDocumentUri(context, uri))
{
// ExternalStorageProvider
if (IsExternalStorageDocument(uri))
return GetExternalStorageDocument(uri);
// DownloadsProvider
else if (IsDownloadsDocument(uri))
return GetDownloadDirectory(context, uri);
// MediaProvider
else if (IsMediaDocument(uri))
return GetMediaDirectory(context, uri);
}
// MediaStore (and general)
else if ("content".Equals(uri.Scheme, StringComparison.OrdinalIgnoreCase))
{
return GetDataColumn(context, uri, null, null);
}
// File
else if ("file".Equals(uri.Scheme, StringComparison.OrdinalIgnoreCase))
{
return uri.Path;
}
return null;
}
public static bool IsExternalStorageDocument(Android.Net.Uri uri)
{
return "com.android.externalstorage.documents".Equals(uri.Authority);
}
private static string GetExternalStorageDocument(Uri uri)
{
var docId = Android.Provider.DocumentsContract.GetDocumentId(uri);
var split = docId.Split(':');
var type = split[0];
return "primary".Equals(type, StringComparison.OrdinalIgnoreCase)
? Android.OS.Environment.ExternalStorageDirectory + "/" + split[1]
: null;
}
private static bool IsDownloadsDocument(Android.Net.Uri uri)
{
return "com.android.providers.downloads.documents".Equals(uri.Authority);
}
private static string GetDownloadDirectory(Context context, Uri uri)
{
var id = Android.Provider.DocumentsContract.GetDocumentId(uri);
var contentUri = ContentUris.WithAppendedId(Android.Net.Uri.Parse("content://downloads/public_downloads"),
Convert.ToInt64(id));
return GetDataColumn(context, contentUri, null, null);
}
private static bool IsMediaDocument(Android.Net.Uri uri)
{
return "com.android.providers.media.documents".Equals(uri.Authority);
}
private static string GetMediaDirectory(Context context, Uri uri)
{
var docId = Android.Provider.DocumentsContract.GetDocumentId(uri);
var split = docId.Split(':');
var type = split[0];
Uri contentUri = type switch
{
"image" => Android.Provider.MediaStore.Images.Media.ExternalContentUri,
"video" => Android.Provider.MediaStore.Video.Media.ExternalContentUri,
"audio" => Android.Provider.MediaStore.Audio.Media.ExternalContentUri,
_ => null
};
const string selection = "_id=?";
var selectionArgs = new string[]
{
split[1]
};
return GetDataColumn(context, contentUri, selection, selectionArgs);
}
public static string GetDataColumn(Context context, Android.Net.Uri uri, String selection,
string[] selectionArgs)
{
Android.Database.ICursor cursor = null;
const string column = "_data";
string[] projection = {
column
};
try
{
cursor = context.ContentResolver.Query(uri, projection, selection, selectionArgs,
null);
if (cursor != null && cursor.MoveToFirst())
{
var column_index = cursor.GetColumnIndexOrThrow(column);
return cursor.GetString(column_index);
}
}
finally
{
cursor?.Close();
}
return null;
}
}`
If I try to open a document from the file explorer it will work. Howewer If the document isn't stored initially in the device I cannot get the uri.
I try to use Intent.ActionView or Intent.ActionOpenDocument but it doesn't work.
Any tips ?
