xamarin.forms

问题 Today I started to learn the world of application development for Android using the Xamarin platform for visual studio 2017. I followed Xamarin's official tutorials and videos on YouTube, when I opened my first project and went to the designer,the designer's screen was fully black. This doesn't happen in any guide or article I have read. Since I'm new, I don't have much idea where the problem might be, I'm attaching appropriate pictures. My Visual Studio's Screen: Desirable Xamarin tutorial's

问题 Today I started to learn the world of application development for Android using the Xamarin platform for visual studio 2017. I followed Xamarin's official tutorials and videos on YouTube, when I opened my first project and went to the designer,the designer's screen was fully black. This doesn't happen in any guide or article I have read. Since I'm new, I don't have much idea where the problem might be, I'm attaching appropriate pictures. My Visual Studio's Screen: Desirable Xamarin tutorial's

问题 I'm new to Prism with Xamarin.Forms. I've implemented the ViewModel approach using the Navigation and Commanding classes. It works just fine but there's just one thing I don't understand. With the AutowireViewModel set to true the ViewModelLocator automatically fills the BindingContext for me and that is sweet. The order of things is not what I expected. First the binding for the properties on the View fire and then the OnNavigatedTo is fired. This means that my init of the properties is

问题 I am monitoring the user's location every 15 minutes and I just want the application to continue sending the location even if the user closes the application in the taskbar. I tried this sample but it's in Xamarin.Android https://docs.microsoft.com/en-us/xamarin/android/app-fundamentals/services/foreground-services i have to create a dependencyservice but i don't know how. 回答1: i have to create a dependencyservice but i don't know how. First, create an Interface in the Xamarin.forms project:

问题 I have an Xamarin Content Page with a List. For the ListItems I want something similar to the cardview in Android. Base on what I found that could be accomplished by a Frame. I have this code: <ViewCell> <StackLayout Padding="8" > <controls:CardView HasShadow="True" OutlineColor="LightGray"> <StackLayout Orientation="Vertical" Padding="5"> // Some labels and Buttons </StackLayout> </Frame> </StackLayout> </ViewCell> The CardView has the following code: public class CardView : Frame { public

问题 Can anyone share your ideas of accessing the custom paths like program data folder in the C drive from UWP application?? I am getting an access denied while accessing this path. Any special capabilities that I have to add to the AppManifest. Basically I need to access this folder from the a KIOSK where.i have a specific file which is to be reused for KIOSK mode in UWP. 回答1: Your only hope is broadFileSystemAccess. Also, this answer could be useful. 回答2: If you want to carry data of a smaller

问题 Making an iOS application using Xamarin and would like to know if there is a way to save images to google drive or one drive. The GoogleDrive API was deprecated last year and is no longer an option, so I'm not sure if it's even possible. I want to try something but I can seem to find any information on the matter. Any pointers? I need a free cloud service to use and that Xamarin supports. Or maybe I can make a stored procedure that can upload my images from the database to a cloud service?

问题 Hi I have a xamarin forms ios application implemented with firebase push notifications. I can receive and mange the click of notifications. Currently I am trying to store the notification data ie; Title,body and two other parameters comes with notification in to sqlite database. I can retrieve and store the data when user clicks. But cant store if user swipe away the notification. How can I get the values as soon as notification appear? Any help is appriciated. My AppDelegate [Register(

问题 I want to implement material outlined textbox in Xamarin.Forms. I had created custom renderers but not able to apply style to it. I want text box like this image https://i.stack.imgur.com/7pWPr.png By creating custom renderer and inheriting from TextInputLayout displays default material textbox. https://i.stack.imgur.com/Ek9Vb.jpg 回答1: You can use Custom Renderer to custom a View which contained a material designed Entry . Create a EntryView in Forms: public class EntryView : ContentView {

问题 I am using Xamarin.forms and implemented Local push notification for iOS. It is working successfully when I am debugging the app through visual studio even when the app is minimized, the app can able to receive the notification. But while running the app directly without debugging through visual studio, the app is not able to display the notification. Kindly guide me on this. Then I also tried by releasing the app to the app store but experienced the same, the app is not able to receive the