How to access the web with the application in Xamarin?
Applications produced in Xamarin also have the ability to access the web and are referred to the Internet and the Web for specific tasks such as updating, etc.
 | 8 minute(s) read | Published on: Mar 24, 2021 Updated on: Dec 14, 2021 |
For local applications to access the web, special settings must be made in their design to finally access the web. This article teaches you how to create a class and access the web through the created classes. If you want to know how to create classes in the application and access the web through classes, it is recommended to follow this tutorial.
In this section, you will learn:
- How to use NuGet Package Manager to add Newtonsoft.Json to Xamarin.Form projects.
- How to create classes that also have access to the web.
- How to use the classes created to access the web?
The requirements for doing this training are as follows:
- Install the latest version of V.Studio 2019 on the system
- Install the latest version of Mobile development with .NET on the system
Learn how to add Newtonsoft.Json to Xamarin.Form projects with NuGet Package Manager using Visual Studio
1- Open Visual Studio.
2- After opening Visual Studio, you need to create a new black Xamarin.Form app.
3- Choose a name to create. The name chosen in this article is WebsiteServiceTutorial.
4- It is better to choose names for the projects and classes created.
Note:
The name chosen for the project must be the same as the name chosen for the solution, so choose the solution name WebServiceTutorial.
5- After naming, you must ensure that the system and application support the .NET Standard mechanism for shared code.
This mechanism is used to share code written in Xamarin.Forms with the C # programming language. If your system and app do not support this mechanism, it cannot have multiple outputs on multiple platforms at once. Therefore, to have multiple outputs on several different platforms simultaneously, you must be sure that your app and system support this mechanism.
6- Right-click in the Solution Explorer section of the WebServiceTutorial project.
7- Select Manage NuGetPackeges.
8- In the NuGet Packages Manager section, select the Browse tab.
9- Search for Newtonsoft.Json, then install it and add it to the project.
10- Build a Solution to ensure there are no errors.
Learn how to create classes in Xamarin. Forms that also have entry to the webpage using Visual Studio
1. In this section of the WebServiceTutorial project, create a new class called Constants and add it to the project.
2. Replace all the code listed below with the Constants. Cs section code.
By entering the above code, you define two constants. OpenWeatherMapEndpoint is an endpoint versus web request, and OpenWeatherMapAPIKey displays your API key for OpenWeatherMap.
3. In this section of the WebServiceTutorial project, create a new class name, WeatherData, and add it.
4. Replace all the codes listed with the weather data—cs section.
By entering this code, you define four classes used to model the recovery of JSON data.
5. In this section of the WebServiceTutorial project, create a new class called RestService and add it to the project.
6. Replace all the below codes with the RestService.cs section.
By entering this code, you define the GetWeatherDataaAsync method. This method uses the HttpClient.GetAsync method to send a GET request to the web API. The web API sends a response that is stored in the HttpResponseMessage object. The response contains the HTTP status code, which determines if the HTTP request was sent successfully.
The web API will respond with HTTP status code 200 (OK) and JSON response if the request is successful.
7. Build a Solution to ensure that there are no errors.
Learn how to use classes in Xamarin. Forms to enter the webpage using Visual Studio.
1- In this section of the WebServiceTutorial project, double-click on MainPage.XAML.
2- Replace all the codes listed with those in that section.
By entering this code, you specify a UI for the page. This UI includes an Entry, a Button, and several Labels in the Grid.
3- In the Solution Explorer section of the WebServiceTutorial project, open the MainPage.XAML file.
4- Double click on MainPage.XAML.cs and replace all the codes listed with those in that file.
The OnButtonClicked method is executed when the button is hit.
5- Press the start button or the Ctrl + F5 key combination to see the result of the applied changes.
The requirements for doing this training are as follows:
- Install the latest version of V.Studio for Mac on the system
- Install the latest version of the support platform for Android and iOS on the system
- Install the latest version of Xcode on the system
Learn how to add Newtonsoft.Json to Xamarin.Forms projects with NuGet Package Manager using Visual Studio for Mac
1- Open V.Studio for Mac.
2- After opening V.Studio for Mac, you need to create a new black Xamarin.Form app.
3- Choose a name to create. The name chosen in this article is WebsiteServiceTutorial.
4- Note: It is better to choose names for the projects and classes created.
Note:
The name chosen for the project must be the same as the name chosen for the solution, so choose the solution name WebsiteServiceTutorial.
5- After naming, you must ensure that the system and application support the .NET Standard mechanism for shared code.
This mechanism is used to share code written in Xamarin.Forms with the C # programming language. If your system and app do not support this mechanism, it cannot have multiple outputs on multiple platforms at once. Therefore, to have multiple outputs on several different platforms simultaneously, you must be sure that your app and system support this mechanism.
6- Right-click on the Solution pad of the WebsiteServiceTutorial project.
7- Select Manage NuGetPackeges.
8- In the Newtonsoft.Json window, search for Add Packages, install it, and add it to the project.
9- Build a Solution to ensure there are no errors.
Learn how to create classes in Xamarin. Forms that also have webpage access using Visual Studio for Mac
1- In the Solution pad section of the WebsiteServiceTutorial project, create a new class called Constants and add it to the project.
2- Replace all the code listed below with the Constants—Cs section code.
By entering the above code, you define two constants. OpenWeatherMapEndpoint is an endpoint versus web request, and OpenWeatherMapAPIKey displays your API key for OpenWeatherMap.
3- In the Solution Explorer section of the WebServiceTutorial project, create a new class, name it WeatherData and add it to the project.
4- Replace all the codes listed with the weather data—cs section.
By entering this code, you define four classes used to model the recovery of JSON data.
5- In the Solution pad section of the WebServiceTutorial project, create a new class, name it RestService and add it to the project.
6- Replace all the below codes with the RestService.cs section.
Return entering this code. You define the GetWeatherDataaAsync method. This method uses the HttpClient.GetAsync method to send a GET request to the web API. The web API sends a response that is stored in the HttpResponseMessage object. The response contains the HTTP status code, which determines if the HTTP request was sent successfully.
The web API will respond with HTTP status code 200 (OK) and JSON response if the request is successful.
7- Build a Solution to ensure that there are no errors.
Learn how to use classes in Xamarin. Forms to enter the web using Visual Studio for Mac.
1- Double click on MainPage.XAML in the Solution pad of the WebServiceTutorial project.
2- Replace all the codes listed with those in that section.
By entering this code, you specify a UI for the page. This UI includes an Entry, a Button, and several Labels in the Grid.
3- In the Solution Explorer section of the WebServiceTutorial project, open the MainPage.XAML file.
4- Double click on MainPage.XAML.cs and replace all the codes listed with those in that file.
5- The OnButtonClicked method is executed when the button is hit.
6- Press the start button or the Ctrl + F5 key combination to see the result of the applied changes.
Finally, you were able to do the following:
- How to use NuGet Package Manager to add Newtonsoft.Json to Xamarin.Forms projects.
- How to create classes that also have access to the web.
- How to use the classes created to access the web.
About our Android and iOS app development services