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Mobile Development

Authenticating Users with an Amazon SimpleDB Service

Posted on janvier 11th, 2018.

Restricting users’ access to their own domain data Amazon SimpleDB does not offer its own resource-based permissions system. Instead, authentication against an identity provider can be used to ensure that users only have access to their own data in the SimpleDB domain. This article explains how to restrict users’ access to their own SimpleDB data. […]

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Mobile Development

Using the Amazon Web Services (AWS) SDK for .NET in a Xamarin.Forms application

Posted on janvier 9th, 2018.

Amazon SimpleDB is a web service that provides the ability to store and query data in Amazon’s cloud. This article explains how to use the AWS SDK for .NET to query, create, replace, and delete data stored in a SimpleDB service. SimpleDB services use a request and response model familiar to consumers of REST services. […]

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Artificial Intelligence

Xamarin.Forms: Adding Intelligence with Cognitive Services

Posted on décembre 18th, 2017.

Microsoft Cognitive Services are a set of APIs, SDKs, and services available to developers to make their applications more intelligent by adding features such as facial recognition, speech recognition, and language understanding. This article provides an introduction to the sample application that demonstrates how to invoke some of the Microsoft Cognitive Service APIs. Overview The […]

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Mobile Development

Xamarin.Forms: Consuming a RESTful Web Service

Posted on août 19th, 2017.

Using the HttpClient class to communicate with a web service Integrating a web service into an application is a common scenario. This article demonstrates how to consume a RESTful web service from a Xamarin.Forms application. Representational State Transfer (REST) is an architectural style for building web services. REST requests are made over HTTP using the […]

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Mobile Development

Xamarin.Forms: Using Xamarin.Auth to store data in the account store

Posted on août 15th, 2017.

Xamarin.Auth is a cross-platform SDK for authenticating users and storing their accounts. It can be used to securely store Account objects in an account store so that applications do not always have to re-authenticate users. For information about using Xamarin.Auth to authenticate users, see Authenticating Users with an Identity Provider. Storing Account Information The following code example shows […]

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Mobile Development

Xamarin.Forms: Handling the SizeChanged event

Posted on août 12th, 2017.

There are a number of approaches that can be used to detect when the screen orientation changes in a Xamarin.Forms app. The simplest approach is to handle the SizeChanged event of the Page. This event fires when either the width or height of the Page changes. Then, an image can be chosen for display by comparing the height and width […]

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Mobile Development

Xamarin.Forms: How to display the correct virtual keyboard for an Entry

Posted on août 10th, 2017.

The Entry control defines a Keyboard property that allows an app to select the virtual keyboard that is displayed for the control. For example, a keyboard for entering a phone number should be different from a keyboard for entering an email address. Specifying a virtual Keyboard The Keyboard property is of type Keyboard. This class defines read-only properties that are appropriate for […]

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Mobile Development

Xamarin.Forms: Adding a Mac App

Posted on août 2nd, 2017.

Before you start, create (or use an existing) Xamarin.Forms project. You can only add Mac apps using Visual Studio for Mac. Adding a Mac App Follow these instructions to add a Mac app that will run on macOS Sierra and Mac OS X El Capitan: In Visual Studio for Mac, right-click on the existing Xamarin.Forms […]

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Mobile Development

Xamarin.Forms: Evaluating JavaScript hosted in a WebView

Posted on juillet 27th, 2017.

The Xamarin.Forms WebView control displays HTML and other web content in an app. Unlike Device.OpenUri, which takes the user to the web browser on the device, the WebView control displays the web content inside the app. For more information about the WebView control. Calling JavaScript The following code example shows how a JavaScript function can be invoked from C#: void OnCallJavaScriptButtonClicked (object […]

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Mobile Development

Xamarin.Forms: Application Indexing and Deep Linking

Posted on juillet 20th, 2017.

Application indexing allows applications that would otherwise be forgotten after a few uses to stay relevant by appearing in search results. Deep linking allows applications to respond to a search result that contains application data, typically by navigating to a page referenced from a deep link. This article demonstrates how to use application indexing and […]