Xamarin Cross-platform Application Development - Second Edition

By Jonathan Peppers

Develop production-ready functions for iOS and Android utilizing Xamarin

About This Book

  • Write local iOS and Android functions with Xamarin.iOS and Xamarin.Android respectively
  • Learn concepts that let you percentage code among iOS and Android
  • Design person interfaces that may be shared throughout Android, iOS, and home windows telephone utilizing Xamarin.Forms

Who This ebook Is For

If you're a developer with event in C# and are only entering into cellular improvement, this is often the publication for you. in case you have adventure with computing device functions or the net, this booklet provides you with a head commence on cross-platform development.

What you'll Learn

  • Learn Apple's MVC layout pattern
  • Understand the Android task lifecycle
  • Share C# code throughout systems and contact local Objective-C or Java libraries from C#
  • Get to grips with unit trying out for cellular applications
  • Implement an online carrier with Azure cellular Services
  • Deploy and debug your software on cellular devices
  • Submit your app to the Apple App shop and Google Play

In Detail

Developing a cellular program for only one platform is turning into a specific thing of the earlier. businesses count on their apps to be supported on either iOS and Android, whereas leveraging the simplest local positive aspects on either. Xamarin's instruments support ease this challenge by means of giving builders a unmarried toolset to focus on either platforms.

This ebook is a step by step consultant to construction real-world purposes for iOS and Android. The booklet walks you thru construction a talk program, entire with a backend net carrier and local positive factors comparable to GPS position, digicam, and push notifications. also, you are going to methods to use exterior libraries with Xamarin and Xamarin.Forms to create shared consumer interfaces and make app-store-ready purposes. This moment version has been up to date with new screenshots and unique steps to supply you with a holistic assessment of the recent positive factors included in Xamarin three. through the top of the publication, you have received services to construct at the suggestions discovered and successfully strengthen a market-ready cross-platform application.

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Utilizing them inside of accepted sessions isn't really supported. those boundaries are one other strong it is because trying out on units is critical because the previous code will paintings wonderful on different structures that could run C# code yet now not Xamarin. iOS. fending off universal reminiscence pitfalls reminiscence on cellular units is unquestionably no longer an enormous commodity. due to this, reminiscence utilization on your program should be even more vital than on computing device purposes. every now and then, you could locate the necessity to use a reminiscence profiler, or increase your code to exploit reminiscence extra successfully. the next are the commonest reminiscence pitfalls: the rubbish collector (GC) is not able to assemble huge gadgets quick sufficient to take care of along with your applicationYour code inadvertently factors a reminiscence leakA C# item is rubbish amassed yet is later tried for use by means of local code rubbish collector let's look at the 1st challenge the place the GC can't sustain. as an example now we have a Xamarin. iOS software with a button for sharing a picture on Twitter as follows: twitterShare. TouchUpInside += (sender, e) => { var photograph = UImage. FromFile("YourLargeImage. png"); //Share to Twitter }; Now let's consider the picture is a ten MB photograph from the user's digital camera roll. If the consumer clicks at the button and cancels the Twitter publish swiftly, there can be a probability of your software operating out of reminiscence. iOS will more often than not strength shut apps utilizing an excessive amount of reminiscence, and also you don't desire clients to event this along with your app. the easiest answer is to name Dispose at the photograph if you are entire with it as follows: var photo = UImage. FromFile('YourLargeImage. png"); //Share to Twitter photograph. Dispose(); a fair larger process will be to use the C# utilizing assertion as follows: using(var photo = UImage. FromFile('YourLargeImage. png")) { //Share to Twitter } The C# utilizing assertion will immediately name Dispose in a try-finally block, so the article gets disposed no matter if an exception is thrown. i like to recommend that you're taking good thing about the utilizing assertion for any IDisposable classification the place attainable. it isn't consistently valuable for small items akin to NSString, yet is often a good suggestion for better, extra heavyweight UIKit gadgets. Tip the same scenario can ensue on Android with the Bitmap classification. even if a bit of diverse, you must name either the Dispose and Recycle equipment in this category besides utilizing the BitmapFactory. recommendations settings for InPurgeable and InInputShareable. reminiscence leaks reminiscence leaks are the following power matters. C# being a controlled, garbage-collected language prevents loads of reminiscence leaks, yet now not them all. the commonest leaks in C# are brought on by occasions. let's consider that we have got a static category with an occasion as follows: static category MyStatic { public static occasion EventHandler MyEvent; } Now, to illustrate we have to join the development from an iOS controller as follows: public override void ViewDidLoad() { base. ViewDidLoad(); MyStatic. MyEvent += (sender, e) => { //Do anything }; } the matter this is that the static classification will carry a connection with the controller till the development is unsubscribed.

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