I created just basic app with two pages having one list array and item object but still when I see apps properties after tns run android command it says ~3.7MB for data on device and also app size is also ~20MB. Since its just a basic app its size should not have been this much.
The application becomes this size because of the modules and libraries it uses. So far it doesn't matter how basic the application is, you have them by default.
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I've built a simple Xamarin.forms app which connects to a web service and gets one piece of data and displays it.
I wanted to do the same on an apple watch (targetting a series 2 apple watch) but I just don't understand how it works.
I've added the watch project and the watch extension, created the interface... Got a "refresh" button which changes the value of the label to a hard coded value but I want to get the data from a simple web service on app startup on wake and when button is activated (similar to my xamarin.forms iphone app)
I've tried using the classes that I use on the forms app to get the data but I can't reference them. I've tried using httpclient and that doesn't work.
After googling it appears I am suppose to use a HandleWatchKitExtensionRequest delegate in the phone app to get the data in a dictionary and then display the data. I haven't been able to find any really simple examples of this, but I'm confused because since apple watch version 3 the watch has been autonomous with cell access and therefore it doesn't have the host app necessarily.
So what I'm asking, is can the watch actually consume a web service alone using a xamarin phone app and if so, is there any simple examples because I can't find any (that aren't from 2015).
Sorry if this is vague, or I sound like a newbie (I definitely am a newbie when it comes to xamarin but any pointers or help would be appreciated)
According to https://developer.apple.com/documentation/foundation/nsurlsession?language=objc NSURLSession is available since watchOS 2.0. It is used to download the content from the web and is extensively documented just don't search for watchOS specifically as it is the same on all Apple OS.
But as HttpClient uses NSURLSession it is also available, so, maybe you need to add the reference to System.Net.Http.
When I was last developing for the watch I noticed that HttpClient would never work. I had to use NSUrlSession, so this is what helped me.
Hope this Helps
Is there a way in Nativescript to detect when another App opens and if so then close it based on a setting flag?
I found a plugin http://plugins.nativescript.org/plugin/nativescript-applist that will list all apps on the phone
NativeScript does not provide such a logic, neither internally nor as a plugin, afaik.
For the Android side you could realize this behavior by writing a background Service which is started at system boot time and periodically checks if apps have been started. Here is an link to an example on SO.
For the iOS side I think this is not possible, imho (correct me if am wrong).
What's the lowest effort way to get a site with server-generated pages (in my case Laravel/PHP) running as a PhoneGap/Cordova app? I'd rather not have to convert the whole thing into a single page app before importing into PhoneGap/Cordova.
Is it possible to use PhoneGap/Cordova as a very thin wrapper and still load each page live from the server? And if so, how exactly please? I don't think we need any native phone APIs.
Reason for the whole thing is my client insists on "having an app" even though obviously our site will work in a mobile web browser and can have an icon on the user's phone.
Many thanks
Unfortunately for your app to pass Apple App store approval it will have to provide some basic functions and display correctly without an internet connection. This means at a minimum, if you plan to generate content on a server you will probably need the Cordova plugin for network information:
https://cordova.apache.org/docs/en/latest/reference/cordova-plugin-network-information/
I would make sure you are familiar with the Apple Human Interface Guidelines:
https://developer.apple.com/ios/human-interface-guidelines/overview/design-principles/
You will probably also need to bundle any JavaScript. Apple is very picky about apps that download code (this can include JavaScript).
This is a section from the iOS developer Agreement.
3.3.2 Except as set forth in the next paragraph, an Application may not download or install
executable code. Interpreted code may only be used in an Application if all scripts, code and
interpreters are packaged in the Application and not downloaded. The only exceptions to the
foregoing are scripts and code downloaded and run by Apple's built-in WebKit framework or
JavascriptCore, provided that such scripts and code do not change the primary purpose of the
Application by providing features or functionality that are inconsistent with the intended and
advertised purpose of the Application as submitted to the App Store.
The following is my opinion only
My fear is that if you go at it in a low effort way, best case you will fail app approval. Worst case it will leave users with a poor experience or worse, a poor image of your client. Do it properly and give the app some extra functions that you can't have in a browser alone. I would advise your client of this and see if they would like a proper app that engages their customers and provides them with a great experience.
I'm thinking about a new mobile/tablet application.
I want to allow the users to develop their own plugins.
Imagine a cash desk application running on a Android tablet. The user could use many alternative when connecting to the credit card reader (Square, Sum'Up, ...).
If my application was an old Win32, I would just publish an API and let Square or Sum'Up developpers create a DLL. This DLL would then be placed somewhere on the computer. At application startup, I just have to look for those DLL and dynamically load them.
In fact, the real question is : Is it possible to create a plugin based application ? I'm thinking about Managed Extensibility Framework here. Many questions come to mind :
How to deploy those plugins ?
Does this work for all the platforms (iOS, Android, UWP) ?
...
I was unable to find any documentation on this.
Many thanks for your thoughts and indications.
Not sure if this answers your question fully.
However, a MEF like architecture could probably work on Android if you put the DLL's somewhere publicly discoverable, such as in /storage/emulated/0. Alternatively, such plugins could be distributed as separate Apps, providing Services, Content Providers and Activities consumable from other Apps.
However, on iOS you would not be able to publish such an App in the App Store though, as Apple does not allow you to use dynamically linked libraries there. You could maybe do it for Apps that don't go on the App Store, such as for Enterprise distribution.
While it might not be the greatest solution. You would always be able to navigate between Apps on iOS through URLs. However, that is not the greatest experience, since this would mean you would be leaving your App every time you wanted to get into a "plugin" App to do something.
I'm new to Xamarin platform. I'm developing an application for all three major platforms (WP,iOS,Android) using Xamarin.forms.
How can I sync data with my server in the background -> I need something similar to Android Service. I want to sync the data even when the user goes to a different screen of the app. It would be great if I could continue syncing the data even when the user leaves the app.
Thank you
This is the only solution i have found
http://arteksoftware.com/backgrounding-with-xamarin-forms/
in a few words:
You can't abstract background tasks in Xamarin.Forms because iOS, Android and WP works in a different way. You have to use MessagingCenter to send and receive data from specific implementations in each platform
Have look to this article: http://developer.xamarin.com/guides/ios/application_fundamentals/backgrounding/part_3_ios_backgrounding_techniques/ios_backgrounding_with_tasks/
You could provably be interested in the Transfer Background tasks.
Regards