C# Android.ToString方法代码示例

        public override ParcelFileDescriptor OpenFile(Android.Net.Uri uri, String mode)
        {
            const string logTag = ClassName + " - openFile";

            Log.Verbose(logTag,
                  "Called with uri: '" + uri + "'." + uri.LastPathSegment);

            if (uri.ToString().StartsWith("content://" + Authority))
            {
                // The desired file name is specified by the last segment of the
                // path
                // E.g.
                // 'content://keepass2android.provider/Test.txt'
                // Take this and build the path to the file

                String fileLocation = Context.CacheDir + File.Separator + AttachmentCacheSubDir + File.Separator
                    + uri.LastPathSegment;

                // Create & return a ParcelFileDescriptor pointing to the file
                // Note: I don't care what mode they ask for - they're only getting
                // read only
                ParcelFileDescriptor pfd = ParcelFileDescriptor.Open(new File(
                    fileLocation), ParcelFileMode.ReadOnly);
                return pfd;

            }
            Log.Verbose(logTag, "Unsupported uri: '" + uri + "'.");
            throw new FileNotFoundException("Unsupported uri: "
                                            + uri.ToString());
        }

        public bool OnError(MediaPlayer mp, Android.Media.MediaError e, int s)
        {
#if DEBUG
            Console.WriteLine("{0}", e.ToString());
#endif
            return true;
        }

		public static async Task<Android.Net.Uri> DownloadDocument (Context ctx, Android.Net.Uri uriToDownload, string saveFilePath, IProgress<DownloadBytesProgress> progessReporter)
		{
			int receivedBytes = 0;
			int totalBytes = 0;

			using (var assetFileDescriptor = ctx.ContentResolver.OpenAssetFileDescriptor (uriToDownload, "r"))
			using (var fileOutputStream = new Java.IO.FileOutputStream (saveFilePath))
			using (var inputStream = assetFileDescriptor.CreateInputStream ()) {
				var buffer = new byte [BufferSize];
				totalBytes = (int)assetFileDescriptor.Length;

				for (;;) {
					var bytesRead = await inputStream.ReadAsync (buffer, 0, buffer.Length);
					if (bytesRead == 0) {
						await Task.Yield();
						break;
					}
					await fileOutputStream.WriteAsync (buffer, 0, buffer.Length);

					receivedBytes += bytesRead;
					if (progessReporter != null) {
						var args = new DownloadBytesProgress (uriToDownload.ToString (), saveFilePath, receivedBytes, totalBytes);
						progessReporter.Report(args);
					}
				}
				inputStream.Close ();
				fileOutputStream.Close ();
			}
			var file = new Java.IO.File (saveFilePath);
			var docUri = Android.Net.Uri.FromFile (file);
			return docUri;
		}

		public override ParcelFileDescriptor OpenFile(Android.Net.Uri uri, string mode)
		{
			string fileName = uri.ToString ().Substring (CONTENT_URI.ToString ().Length);

			System.Console.WriteLine (fileName + " - File to open in external app");
			if (System.IO.File.Exists (fileName)) {
				return ParcelFileDescriptor.Open(new Java.IO.File(fileName), ParcelFileMode.ReadOnly);
			}

			return null;
		}

		void ShowPdfDocument (Android.Net.Uri docUri)
		{
			// Customize thumbnailBar color defaults
			var thumbnailBarThemeConfiguration = new ThumbnailBarThemeConfiguration.Builder (this)
				.SetBackgroundColor (Android.Graphics.Color.Argb (255, 52, 152, 219))
				.SetThumbnailBorderColor (Android.Graphics.Color.Argb (255, 44, 62, 80))
				.Build ();

			// Show Document using PSPDFKit activity
			var pspdfkitConfiguration = new PSPDFActivityConfiguration.Builder (ApplicationContext, yourLicenseKey)
				.ScrollDirection (PageScrollDirection.Horizontal)
				.ShowPageNumberOverlay ()
				.ShowThumbnailGrid ()
				.ShowThumbnailBar ()
				.ThumbnailBarThemeConfiguration (thumbnailBarThemeConfiguration)
				.Build ();

			if (!PSPDFKitGlobal.IsOpenableUri (this, docUri))
				ShowError ("This document uri cannot be opened \n " + docUri.ToString ());
			else
				PSPDFAppCompatActivity.ShowDocument (this, docUri, pspdfkitConfiguration);
		}

		private string GetPathToImage(Android.Net.Uri uri)
		{
			string doc_id = "";
			try{
				using (var c1 = Application.Context.ContentResolver.Query (uri, null, null, null, null)) {
					c1.MoveToFirst ();
					String document_id = c1.GetString (0);
					doc_id = document_id.Substring (document_id.LastIndexOf (":") + 1);
				}
			}catch{
				Log.Debug ("GetPathToImage","Excepcion! El content es File");
				Android.Content.Context context = Android.App.Application.Context;
				try{
					String[] proj = { MediaStore.MediaColumns.Data };
					Log.Debug ("GetPathToImage","Y la URI? "+uri.ToString());

					//	var c1 = context.ContentResolver.Query (uri, proj, null, null, null)
					var loader = new CursorLoader (context, uri, proj, null, null, null);
					var c1 = (ICursor)loader.LoadInBackground();

					if(c1==null){
						Log.Debug ("GetPathToImage","Sigue siendo nulo-");
					}

					c1.MoveToFirst ();
					Log.Debug ("GetPathToImage","Pasamos?");

					String document_id = c1.GetString (0);
					doc_id = document_id.Substring (document_id.LastIndexOf (":") + 1);
					Log.Debug ("GetPathToImage","Y bien? "+doc_id);

				}
				catch(Exception ex){
					Log.Debug ("GetPathToImage","Excepcion! "+ex);
				}
			}

			string path = null;
			// The projection contains the columns we want to return in our query.
			string selection = Android.Provider.MediaStore.Images.Media.InterfaceConsts.Id + " =? ";
			using (var cursor = Application.Context.ContentResolver.Query(Android.Provider.MediaStore.Images.Media.ExternalContentUri, null, selection, new string[] {doc_id}, null))
			{
				if (cursor == null) return path;
				var columnIndex = cursor.GetColumnIndexOrThrow(Android.Provider.MediaStore.Images.Media.InterfaceConsts.Data);
				cursor.MoveToFirst();
				path = cursor.GetString(columnIndex);
				//cursor.Close ();
			}
			return path;
		}

		public override bool OnContextItemSelected (Android.Views.IMenuItem item)
		{
			//Note how this callback is using the fully-qualified class name
			Toast.MakeText (this, "Got click: " + item.ToString (), ToastLength.Short).Show ();
			return true;
		}

 public bool OnError(Android.Media.MediaPlayer mp, Android.Media.MediaError what, int extra)
 {
     this.RootPlayer.FireError (what.ToString ());
     return true;
 }

		public bool OnError (Android.Media.MediaPlayer mp, Android.Media.MediaError what, int extra)
		{
			this.ParentElement.HasError = true;
			this.ParentElement.ErrorMessage = what.ToString ();

			this._HasEnded = true;
			// true handle, false allow pass
			return false;
		}

		public override string GetType (Android.Net.Uri uri)
		{
			var mimeType = MimeTypeHelper.GetMimeType(uri.ToString());

			return mimeType;
		}

        void ShowPdfDocument(Android.Net.Uri docUri, string filename)
        {
            // Customize thumbnailBar color defaults
            var thumbnailBarThemeConfiguration = new ThumbnailBarThemeConfiguration.Builder (Forms.Context)
                .SetBackgroundColor (Android.Graphics.Color.Argb (255, 52, 152, 219))
                .SetThumbnailBorderColor (Android.Graphics.Color.Argb (255, 44, 62, 80))
                .Build ();

            // Show Document using PSPDFKit activity
            var pspdfkitConfiguration = new PSPDFActivityConfiguration.Builder (Forms.Context, MainActivity.LicenseKey)
                .ScrollDirection (PageScrollDirection.Horizontal)
                .ShowPageNumberOverlay ()
                .ShowThumbnailGrid ()
                .ShowThumbnailBar ()
                .ThumbnailBarThemeConfiguration (thumbnailBarThemeConfiguration)
                .Build ();

            if (!PSPDFKitGlobal.IsOpenableUri (Forms.Context, docUri)) {
                ShowError ("This document uri cannot be opened \n " + docUri.ToString ());
            } else {
                try{
                    PSPDFAppCompatActivity.ShowDocument (Forms.Context, docUri, pspdfkitConfiguration);
                }
                catch(Exception ex){
                    var error = ex.StackTrace;
                }

            }
        }