If you set up your activity appliance my antecedent cavalcade as a adviser and chase forth with this column, again you’ll accept a (not able-bodied architected) Xamarin app active on your Android buzz in a few minutes.
Creating Your UI If you acclimated my antecedent cavalcade as a guide, your Xamarin band-aid will accept a .NET Standard Activity with a absence XAML file. That’s apparently as acceptable a alpha point for creating your “Hello, World” appliance as any. In my absence XAML page, I accept a Characterization central a StackLayout element, central a ContentPage element, like this:
The ContentPage aspect is required. However, if you intend to accept alone one aspect central the ContentPage, you can omit the StackLayout. A distinct aspect folio apparently isn’t astute so, leave the StackLayout ascendancy in abode and add a Button aspect beneath the Label. Give that Button aspect an x:Name aspect (so that you can accredit to the Button from code) and a argument attribute. Here’s what abundance looked like:
You’ll additionally charge to add an x:Name aspect to any added aspect that you intend to accredit to from code. I’ve adapted the absence Characterization ascendancy so I can use it like this:
You’re now accessible to add cipher to your basal application. In a well-architected application, you’d use the MVVM architecture arrangement actuality to apparatus your cipher (you ability to accede leveraging the MvvmCross amalgamation that Nick Randolph has described).
For a “Hello, World” application, though, we’ll use article simpler: accident handlers. The easiest way to add an accident abettor to a Button in your XAML book is to add the Clicked aspect to the Button element. After you blazon the equals assurance afterward the aspect name a <New Accident Handler> abettor will appear. Hit the Enter key to both add an accident abettor to your Page’s code-behind book and wire that abettor up to your Button.
My final Button aspect looked like this:
If you about-face to the xaml.cs book associated with your XAML file, you should acquisition a adjustment to handle the accident cat-and-mouse for you. Abundance looked like this:
Adding the cipher to that adjustment to amend my Characterization with “Hello, World” aback the on was clicked looked like this:
Debugging You’re now accessible to alter your app. You could columnist F5 and analysis your app in one of Visual Studio’s emulators, but where’s the fun in that? With Visual Studio 2017 and Xamarin’s Live Player, you can run your UI on your Android smartphone while debugging your cipher in Visual Studio. Besides, if your computer doesn’t accept a cartoon accouterments accelerator, your adversary isn’t activity to run, so abundant as it will booty a comfortable ramble.
The aboriginal footfall in implementing this abracadabra is to accomplish abiding that your Android smartphone and your development computer are on the aforementioned network. Your additional footfall is to install the Xamarin Live Player app from Xamarin Inc. on your smartphone through Google’s Play Store. Once Live Player is installed, alpha it running. You’ll get a (mostly) atramentous awning with a on labeled Pair in the lower right-hand corner.
Now acknowledgment to Visual Studio and, in Tools | Options | Xamarin | Other, accomplish abiding that Enable Xamarin Live Player is checked. After closing the Options dialog, on the toolbar’s account of accessories you can alter with (that is, the “F5 on”), baddest the Manage Xamarin Live Play Accessories choice. This will pop up a chat box with a bar code. Aim your phone’s camera at the bar cipher and bang the Live Player’s Pair on. You’ll see a quick account of your awning arise on your buzz and again disappear: Your buzz is now paired. Use the X in the high appropriate duke bend of the chat box in Visual Studio to accomplish that chat box disappear.
You’ll acquisition that you accept a new accessory on your dropdown account of accessories you can alter with. It will accept a name that reflects your buzz (mine says Samsung GM-G950W Player, for example). Baddest that best and columnist F5: You should see your appliance active on your phone. Some backbone may be appropriate — analysis Visual Studio’s Output window to see how your abridge and arrange action is going.
One your app is announcement on your phone, columnist the Bang Me! on on your anatomy and your bulletin should arise in your label. One allotment of advice: Keep an eye on the debugging accessory you’ve called in your toolbar. I’ve begin that it will accidentally about-face aback to appliance one of the emulators.
Poof! You’re now a Xamarin/smartphone/mobile/cross-platform developer. Amend your resume and acclimatize your announcement ante accordingly.
Peter Vogel is a arrangement artist and arch in PH&V Information Services. PH&V provides full-stack consulting from UX architecture through article clay to database design. Peter tweets about his VSM columns with the hashtag #vogelarticles. His blog posts on user acquaintance architecture can be begin at http://blog.learningtree.com/tag/ui/.
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