Xamarin Development Problems And Fixes

Problem

Xamarin.Forms.WebView Control wont display webpage, even thought a web address has been supplied to its source property.
By default application can only communicate with servers that implement best-practice security (ATS).
 Fix

To fix this, the most simple way is to change the http of an address to https
otherwise read more here
https://developer.xamarin.com/guides/cross-platform/xamarin-forms/user-interface/webview/

 

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Problem

Json retrieved from web service padded with escape characters '\\\', wont de-serialize back to objects;

Json looks like below

"\"{\\\"BeaconId\\\":\\\"aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa\\\",\\\"BeaconName\\\":\\\"Milk - Cereal Aisle - Ice\\\",\\\"BeaconUuid\\\":\\\"B9407F30-F5F8-466E-AFF9-25556B57FE6D\\\",\\\"FirstName\\\":\\\"Tom\\\",\\\"LastName\\\":\\\"Jones\\\",\\\"ProductAdId\\\":\\\"375b973f-b7b0-49e2-bef1-53cc64f0adc9\\\",\\\"ProductAdUrl\\\":\\\"http:\\\\/\\\\/www.smh.com.au\\\\/lifestyle\\\\/diet-and-fitness\\\\/the-skinny-on-lowfat-20130703-2pd1y.html\\\",\\\"ProductCategoryId\\\":1,\\\"ProductName\\\":\\\"Brownes Low-Fat Milk\\\",\\\"UserId\\\":\\\"aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa\\\"}\""; 

Fix

json = json.Remove(0, 1);

json = json.Remove(json.Length - 1, 1);
json = Regex.Unescape(json);


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Xamarin Page Navigation Tutorial using MVVM light

https://mallibone.com/post/xamarin.forms-navigation-with-mvvm-light 


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Gesture API and samples allows you recognize gestures and perform actions, for example has a same that rotates/ zooms into pictures using the pinch gestures

https://github.com/MichaelRumpler/GestureSample
https://forums.xamarin.com/discussion/33214/zoom-on-image



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Pin Login Control

http://www.wintellect.com/devcenter/jprosise/writing-cross-platform-mobile-apps-with-visual-studio-2015-and-xamarin-forms-2


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Authentication saving

https://developer.xamarin.com/recipes/cross-platform/xamarin-forms/general/store-credentials/ 


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Navigation page removing icon

https://forums.xamarin.com/discussion/34871/remove-icon-from-action-bar-from-xamarin-forms-android-project


------------------------------------------------------Splash Screen

http://codeworks.it/blog/?p=294