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| public class AndroidExternalStorageWriter : IAndroidExternalStorageWriter | |
| { | |
| public string CreateFile(string filename, byte[] bytes) | |
| { | |
| if (!Directory.Exists(Path.Combine(Android.OS.Environment.ExternalStorageDirectory.AbsolutePath, "AccountMate"))) | |
| Directory.CreateDirectory(Path.Combine(Android.OS.Environment.ExternalStorageDirectory.AbsolutePath, "AccountMate")); | |
| var path = Path.Combine(Android.OS.Environment.ExternalStorageDirectory.AbsolutePath, "AccountMate", filename); | |
| File.WriteAllBytes(path, bytes); | |
| return path; | |
| } | |
| } |
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| public class DocumentViewer : IDocumentViewer | |
| { | |
| public void ShowDocumentFile(string filepath, string mimeType) | |
| { | |
| var uri = Android.Net.Uri.Parse("file://" + filepath); | |
| var intent = new Intent(Intent.ActionView); | |
| intent.SetDataAndType(uri, mimeType); | |
| intent.SetFlags(ActivityFlags.ClearWhenTaskReset | ActivityFlags.NewTask); | |
| Forms.Context.StartActivity(Intent.CreateChooser(intent, "Select App")); | |
| } | |
| public DocumentViewer() | |
| { | |
| } | |
| } |
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| public static async void ViewFile(byte[] fileBytes, string filename) | |
| { | |
| var filepath = ""; | |
| if (Device.OS == TargetPlatform.Android) | |
| { | |
| var androidWriter = Resolver.Resolve<IAndroidExternalStorageWriter>(); | |
| filepath = androidWriter.CreateFile(filename, fileBytes.ToArray()); | |
| } | |
| else if (Device.OS == TargetPlatform.iOS) | |
| { | |
| using (var pdfBytes = new MemoryStream(fileBytes)) | |
| { | |
| var rootFolder = FileSystem.Current.LocalStorage; | |
| var file = await rootFolder.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting); | |
| filepath = file.Path; | |
| var newFile = await file.OpenAsync(FileAccess.ReadAndWrite); | |
| using (var outputStream = newFile) | |
| pdfBytes.CopyTo(outputStream); | |
| } | |
| } | |
| if (string.IsNullOrEmpty(filepath)) | |
| return; | |
| var documentViewer = Resolver.Resolve<IDocumentViewer>(); | |
| var mimeType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document"; | |
| if (Path.GetExtension(filename).ToLower() == ".pdf") | |
| mimeType = "application/pdf"; | |
| try | |
| { | |
| documentViewer.ShowDocumentFile(filepath, mimeType); | |
| } | |
| catch (Exception ex) | |
| { | |
| Debug.WriteLine(ex.Message); | |
| } | |
| } |
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| public interface IAndroidExternalStorageWriter | |
| { | |
| string CreateFile(string filename, byte[] bytes); | |
| } |
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| public interface IDocumentViewer | |
| { | |
| void ShowDocumentFile(string filepath, string mimeType); | |
| } |
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| public class DocumentViewer : IDocumentViewer | |
| { | |
| public DocumentViewer() | |
| { | |
| } | |
| public void ShowDocumentFile(string filepath, string mimeType) | |
| { | |
| var fileinfo = new FileInfo(filepath); | |
| var previewController = new QLPreviewController | |
| { | |
| DataSource = new PreviewControllerDataSource(fileinfo.FullName, fileinfo.Name) | |
| }; | |
| var controller = FindNavigationController(); | |
| controller?.PresentViewController(previewController, true, null); | |
| } | |
| private UINavigationController FindNavigationController() | |
| { | |
| foreach (var window in UIApplication.SharedApplication.Windows) | |
| { | |
| if (window.RootViewController.NavigationController != null) | |
| { | |
| return window.RootViewController.NavigationController; | |
| } | |
| var value = CheckSubs(window.RootViewController.ChildViewControllers); | |
| if (value != null) | |
| return value; | |
| } | |
| return null; | |
| } | |
| private UINavigationController CheckSubs(UIViewController[] controllers) | |
| { | |
| foreach (var controller in controllers) | |
| { | |
| if (controller.NavigationController != null) | |
| { | |
| return controller.NavigationController; | |
| } | |
| var value = CheckSubs(controller.ChildViewControllers); | |
| return value; | |
| } | |
| return null; | |
| } | |
| } | |
| public class DocumentItem : QLPreviewItem | |
| { | |
| private readonly string _uri; | |
| public DocumentItem(string title, string uri) | |
| { | |
| ItemTitle = title; | |
| _uri = uri; | |
| } | |
| public override string ItemTitle { get; } | |
| public override NSUrl ItemUrl => NSUrl.FromFilename(_uri); | |
| } | |
| public class PreviewControllerDataSource : QLPreviewControllerDataSource | |
| { | |
| private readonly string _url; | |
| private readonly string _filename; | |
| public PreviewControllerDataSource(string url, string filename) | |
| { | |
| _url = url; | |
| _filename = filename; | |
| } | |
| public override IQLPreviewItem GetPreviewItem(QLPreviewController controller, nint index) | |
| { | |
| return new DocumentItem(_filename, _url); | |
| } | |
| public override nint PreviewItemCount(QLPreviewController controller) | |
| { | |
| return 1; | |
| } | |
| } |
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Thanks, It's was very useful