Android app for downloading files tutorial c#

Figure 2 The default file opened in the editor is Activity1. If you look at the code of Activity1 class listed in Listing 1, you will see there are six Android namespaces are added to the file. The default namespace of the project is the project name you created in Visual Studio. App; using Android. Content; using Android. Runtime; using Android. Views; using Android. Widget; using Android. MyButton ; button. Each Android application must have at least one Activity. The class also has an overridden OnCreate method.

This is the most useful method and gets executed when an application starts. You should write all the initialization and UI related code here. Before we discuss this in more detail, let's take a look at the other files in the project. You can also expand these folders to see what default files are added to the project. We are going to discuss these files one at a time.

Before we get into more details, let's add code for our Hello Android display on the screen. The TextView object works as a TextBox control. It is used to display and manage text on the screen. Now let's build and run the application. Select Build and Run menu item in Visual Studio. The first thing you will see is a screen to select devices. If you have an Android enabled device attached to your computer, you will see that listed here.

If an update for Visual Studio is available, an Update button will be shown. Select it to update before modifying the installation. Find your Visual Studio installation and select Modify. Select Mobile development with.

NET and click Modify. If an update is available, your Visual Studio installation will have an Update button. Select it to update. Download and install Visual Studio for Mac. Available updates will be displayed and select Update. Select Create a new project. Select Mobile from the Project type drop-down. Select the Mobile App Xamarin. Forms template and select Next.

Enter AwesomeApp as the project name and select Create. If you get a dialog box warning about firewall blocking some features, select the Allow access button. Select the Blank template. Ensure Android and iOS are both selected and select Create. Restore NuGet packages NuGet is a package manager that will bring in the dependencies of your new app. Select New Project. Enter AwesomeApp as the app name and select Next.

Enable developer mode Go to the Settings screen. Find Build number by using search at the top of the settings screen or locate it in About phone. Tap Build number times until "You are now a developer! Find USB debugging by using search at the top of the settings screen or locate it in Developer options.

Enable USB debugging if it isn't enabled already. Trust device Plug your device into your computer. You will be prompted to Allow USB debugging. Check Always allow from this computer.

Select Allow. Your device is now configured and will show up in Visual Studio as a deployment target. Set up iOS device For this tutorial, we'll focus on setting up and deploying to Android. Your application will build then deploy to the iOS simulator and run. Edit your code When developing applications with Xamarin. Next steps Congratulations, you've built and run your first Xamarin app powered by. Keep learning Now that you've got the basics, continue building your first Xamarin app with Xamarin.

Forms Quickstarts Learn the basics of creating mobile apps with Xamarin. Add native features Integrate Xamarin. Essentials to access cross-platform native APIs. Data services Data storage and cloud services for mobile apps. Let's get started. Continue I ran into an issue. Report an issue If something went wrong and you don't know how to fix it, open an issue on GitHub.

Provide feedback If something on this page wasn't clear or you have a suggestion for how to improve it, let us know. Follow us. Once all ok you will see the IDE which is like a cross between Visual Studio and Eclipse, it has intellisense and fancy text colours and highlighting. At this point we are more interested on the 2 files on the solution, that layout and the MainActivity. First lets design you calculator, you need to go to that Main.

To see how each of them would look like here is an illustration. Relative Layout — specify the location of child objects relative to each other. For example object A is placed on the left of object B or it can be aligned to a parent.

Now lets start designing, for this project we will using a mix of Linear and Relative. Copy and Paste the code below then I will give you some explanation of what it does. Net object properties.