Complete Walkthrough and Explanation to Design Android App using C#

Sep 12,2019 by Guest Author
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Apps are on the rise today with the progress of technology. Almost all of the new businesses being established online are making it a point to have a presence in the world of smartphones. As much as there are numerous mobile OS trending across the globe, Android has been among the frontrunner in the world of Mobile Apps, owing to its user and developer-friendly interface. One of the key points of android app development features in different programming concepts, one including C#. 

C# is a programming language, following constructive modules adapted in building the base of any android app. For running C#, however, there was a need for a separate software called MonoDroid that helps in running the codes to suit Android application and operational package. Using this software, a person today can develop Android-based mobile applications by using the likes C# and even .NET. 

More about Android App Development by C#

Novell developed Monodroid, and the structure design combines with the likes of Visual Studio version 2010 for giving out app-based output. Installing the same requires the users to have a fully functional Visual Studio add-on as well since this will combine with the main workforce template. Unlike this edition, the software does not combine and work with the Visual Studio Express edition. Now we are going to look at the set of the process required for designing an Android app using the software involving systematic approach.

Installation of MonoDroid

MonoDroid for its credit is available to download from www.monodroid.net. If you are having any issues or questions regarding the installation, read the instruction at www.monodroid.net/Installation

As a developer, you require setting up MonoDroid, Android SDK, and all particular software programs ready to kick start the designing of a simple Android app using the C# concept. 

Custom Creation

In the process, we are set to design the first ever-Android app. The motive of the app is to flash the message Hello Android on the screen. 

Next up, open the Visual Studio 2010 interface and click on the new project option. Choose Visual C# as the language along with category being MonoDroid. This is located on the left-hand side panel, near the project template categories.

In the forthcoming step, choose the MonoDroid option, and you are likely to see three different template modules, including,

  • MonoDroid Application
  • OpenGL MonoDroid Application
  • MonoDroid Class Library

All these templates have usage related to the usage of functional aspects. In this stage, the first option, i.e. MonoDroid Application project, is chosen. The next step involves coding information and explanation and here are more details,

  • Click on the MonoDroid Application option to enter the project template. It will contain the pre-designed project name HelloAndroid. 
  • Click on OK and a new project will get created, having a broad set of pre-defined codes and files to contemplate.
  • The File opened on an active editor is named as Activity1.CS. It is listed under Listing 1, and there are other 6 Android objectives inserted in the file codes. 
  • The pre-designed name of the project is similar to that created in the Visual Studio Interface. With this said, here is the Listing 1, comprising the first set of Codes,

using System;  

using Android.App;  

using Android.Content;  

using Android.Runtime;  

using Android.Views;  

using Android.Widget;  

using Android.OS;  

namespace HelloAndroid  

{  

    [Activity(Label = “HelloAndroid”, MainLauncher = true)]  

    public class Activity1 : Activity  

    {  

        int count = 1;  

        protected override void OnCreate(Bundle bundle)  

        {  

            base.OnCreate(bundle);  

            // Set our view from the “main” layout resource  

            SetContentView(Resource.Layout.Main);  

            // Get our button from the layout resource,  

            // and attach an event to it  

            Button button = FindViewById<Button>(Resource.Id.MyButton);  

            button.Click += delegate { button.Text = string.Format(“{0} clicks!”, count++); };  

        }  

    }  

}   

Explanation:

  • Under the HelloAndroid project, the first line is the declaration of the HelloAndroid as the main label.
  • In the next step, the first launcher is started to set the value to be true for all values. This is followed up with the opening of the public class, that is Activity1. In short, this is the inherited class, derived under the parent class Activity.
  • Initialize the integer variable count with 1. 
  • Open a protected function, having the ability to override the set of codes. Pass comment on the function (Bundle, bundle), making it execute first up.
  • Inside the protected class, call the function using base class and using the function.OnCreate() with bundle passed as the comment. This will ensure the view from the main layout resource be visible from the developer’s end.
  • Call the function SetContetView(Resource.Layout.Main). It will return from the layout resource and eventually will attach the event of execution.
  • In the next step, create a function Button button and declare under FindViewById.
  • In the final step, declare the button function with a value under delegate function and declare the initial string with the count, acting as a counting variable.

Next up, it is essential to look on the left side of the screen that has the Solution and Team Explorer tabs. Under the Solution explorer tabs, there are multiple file options, including the likes of Layout, Assets, Resources, and Values, to name a few. 

Next, on the display screen, add up the code Hello Android on the main page. To do this, type the same on the OnCreate method and add up TextView object alongside. It will change the text property to Hello Android. 

protected override void OnCreate(Bundle bundle)  

{  

    base.OnCreate(bundle);  

    var tv = new TextView (this);   

    tv.Text = “Hello, Android!”;  

    // Set our view from the “main” layout resource  

    SetContentView(tv);  

}   

Explanation:

  • The TextView function will execute var TV’s function next up. Since the function is called over the line itself. 
  • While calling tv. Text, the previous function is called and Hello Android, the text is printed.
  • Finally, arrange the SetContentView as the TV. Since this is a recursive call, the function will keep on repeating, and the value would still show the same output only.

Application Interface

With the SetContentView() function done, the next part involves creating the outer interface of the app. Here are some steps required to keep up,

  • Choose the Build and Run Menu option, located in Visual Studio
  • Next up, a page appears requiring you to choose devices. For Android backed devices attached to the PC, you can take the help of Emulator. Click on the emulator option on the screen.
  • The next step involves choosing the type of emulator. There might be multiple images available to run. For this case, choose the MonoDroid option, since it hosts the custom-designed page of codes.
  • On clicking the OK button, you will see the Mono runtime check is being conducted. This will ensure to import the codes from the backend studio and will run accordingly.
  • On the successful running of the android codes, you can search the application part in your mobile phone and search for HelloAndroid. This app will only show up the Hello Android message.

Recap of Android Application Development

C# coding is essential, and so is the framework. In this brief explanation, there has not been much use of an advanced framework for execution. Android app development is all about how brilliantly a developer uses the framework for a seamless user experience. MonoDroid is a brilliant software allowing users to run codes with Visual Studio 10 version and display with essential functions. This makes understanding and coding easier to work.

In the end, you are ready with your code, and you can try out some other modules and options if you are well aware of Android SDK, .NET, and C# coding tricks and tips. Similarly, you can use HTML and other modern-day frameworks to design your app and C#, without complicating with the hardcore coding stuff.

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