ffimageloading | 易学教程

Is there a library to resize an image

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问题 I am currently using FFImageLoading package to do caching etc to show on the ui. I am unsure whether FFImageLoading have function to resize the image itself so i can save it and send over the internet. 回答1: It's as easy as: var stream = await ImageService.Instance.LoadFile("someimage.png") .DownSample(width: 200) .AsPNGStreamAsync(); 来源： https://stackoverflow.com/questions/41625118/is-there-a-library-to-resize-an-image

Is there a library to resize an image

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FFImageLoading: How to add authentication?

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问题 I'm trying to use FFImageLoading in my Xamarin.iOS and Xamarin.Android apps to load images from url. All the url's require authentication.. Also I'm using modernhttpclient for all other Rest Calls. For modernhttpclient this is how I'm adding authentication var cookieHandler = new NativeCookieHandler (); var messageHandler = new NativeMessageHandler (false, false, cookieHandler); cookieHandler.SetCookies (RestApiPaths.cookies); using (var client = new HttpClient (messageHandler)) { client

Xamarin Android FFImageLoading ImageService.Instance.LoadUrl() System.NullReferenceException

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问题 I've got a strange problem with FFImageLoading . Compiler don't show any error, but while application is starting on device, there is thrown an exception: System.NullReferenceException . Code: C# private void setUserImage() { ImageService.Instance.Initialize(); imgThunbailUsername = FindViewById<ImageViewAsync>(Resource.Id.imgDisplay); string url = @"https://lh4.googleusercontent.com/-Lfgi-xEMwuk/VNWoy8EDWcI/AAAAAAAAACk/rwsluNfhSZY/w1486-h832-no/photo.jpg"; ImageService.Instance.LoadUrl(url)

How to optimize the loading of a big amout of images?

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问题 I upload a large number of images from a REST service and use them to create various gif image thanks to a periodic task. I'd like to know how to optimize my code, to impove it and make it faster. public class WebcamListViewModel : BaseViewModel { public ICommand InitializeWebcamsCommand { set; get; } public ICommand OpenVideoWebcamCommand { set; get; } private List<Webcam> _ListOfWebcam { get; set; } public List<Webcam> ListOfWebcam { get { return _ListOfWebcam; } set { _ListOfWebcam = value

How do load a image stored locally in byte array using FFImageLoading for Xamarin?

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问题 I need to be able use FFImageLoading.ImageService to load a byte array I decoded from an image earlier, into a FFImageLoading.Views.ImageViewAsync object. The method ImageService.Instance.LoadImage(IImageLoaderTask task) seems to be the way but I have no idea how to set up an object of that interface and I can't find any references to using this type object on the source website. How to load a byte[] into a ImageViewAsync object? 回答1: Since you already have a byte[] you could you this with

Android FFImageLoading using URI (Xamarin)

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问题 I am trying to load the contact images from a cursor, so I have the URI of each image. But I would like to use the FFImageLoading library to add these images to the view, so that I can easily load placeholders and do a circle transform. However, I am having difficulty using the library with a URI - I have tried converting the URI to a url using the Path to use the LoadFromURL method, but that has been unsuccessful. So I am wondering if it would be better to use the LoadImage or LoadStream

FFImageLoading : load into an ImageButton

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问题 In Xamarin.Android, to load an image using FFImageLoading, a ImageViewAsync must be used instead of a standard ImageView. I couldn't find what I can use if I wanna load my image into an ImageButton. Didn't find an "ImageButtonAsync". 回答1: AFAIK there is no particular ImageButton to use with FFImageLoading but you can use directly an ImageViewAsync set it as android:clickable="true" and add the click event. And as stated here an ImageButton is just an ImageView that has a non-null background

How do load a image stored locally in byte array using FFImageLoading for Xamarin?

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I need to be able use FFImageLoading.ImageService to load a byte array I decoded from an image earlier, into a FFImageLoading.Views.ImageViewAsync object. The method ImageService.Instance.LoadImage(IImageLoaderTask task) seems to be the way but I have no idea how to set up an object of that interface and I can't find any references to using this type object on the source website. How to load a byte[] into a ImageViewAsync object? Since you already have a byte[] you could you this with the LoadStream method. Something like: ImageService.Instance .LoadStream (GetStreamFromImageByte) .Into

Why are my Xamarin UWP Images not showing up on device?

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问题 I am developing a Xamarin UWP app using ffimageloading. The images show up just fine on the Windows Phone emulator that I am running through Visual Studio, but when I deploy it to a device through the device portal all of the images are missing. <ffimageloading:CachedImage Grid.Column="0" Grid.Row="1" Source="{helpers:ImageResource MyProject.Assets.Images.music-doublenote.png}" /> 回答1: The issue was the build configuration. By turning off "Compile with .NET Native tool chain" on the Build tab