|
Good Day All
i have a ListView that is defined in a Xamarin Form. i want this ListView to be updated with the Data from the DB every 5 seconds. In a Non Mobile environment , we have a Windows Service , which is a long running Service. but now i search i came across a Service. but now i see this is implemented differently on each platform. Most examples i get are examples where one is binding the Control in Android Project. WhatUp if my Data binding is done in Xamarin Form (Standard Class) .
1) Can i kindly have the example link or code that refresh any control from a Service that runs in Intervals
2) Update the control that is hosting in a PLC or Standard Class
Thanks
Vuyiswa Maseko,
Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.
C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vimalsoft.com
vuyiswa[at]vimalsoft.com
|
|
|
|
|
Service itself is a concept that is tied to Android platform, you will not find the same concept (check how Services run, and on which thread), and every platform (iOS, Windows) has its own implementation and best practices for a Service, that is why Xamarin.Forms itself does not have any such library or object. You can however always create your own service that utilize thread pool threads, and runs a job at an interval.
Now what you want is a service that services for data, and displays it in the ListView. This has 2 parts, one is the background service that retrieves the data from Windows Service (might it be an API or something that you have!) and the other part is that feeds the data to the UI. This can be solved, if you write a service component, that reads the data inside the Page. This way your Page will have the data that needs to be shown. Now, the last phase of displaying the data can be done using ObservableCollection<T>, this will automatically map the elements to your ListView. See this for an example of how this can be done, ListView Data Sources - Xamarin | Microsoft Docs
So, to wrap, you need to create a (most likely DI based) Service, that will create either a platform dependant or Xamarin.Forms dependant service, and that service should return the data to your Page (an asynchronous API will help even better, enabling your page to refresh only when the data is available without the need of setting a timer and checking for updates), and then lastly bind the data to the page.
How to add background service in Xamarin forms — Xamarin Community Forums
The sh*t I complain about
It's like there ain't a cloud in the sky and it's raining out - Eminem
~! Firewall !~
|
|
|
|
|
Thanks for your valuable advice. I used SignalR and it worked for me.
|
|
|
|
|
I am trying to make little app with html javascript with database websql in my computer i have some problem when to send the data from websql to my server is there anybody can help me give a sample app write in javascript and the php also.
thank you
|
|
|
|
|
Does this have something to do with mobile devices?
And if you want sample code then you need to search for it. Use Google or go to the CodeProject Articles section.
|
|
|
|
|
This is my first ever attempt at Xamarin Forms. I followed this Quick Start
When I run it i get the error
DEP3321: To deploy this application, your deployment target should be running Windows Universal Runtime version 10.0.16299.0 or higher. You currently are running version 10.0.15063.1155. Please update your OS, or change your deployment target to a device with the appropriate version.
I found this SO post about this very error. When I try the fixes it produces a bunch of compatibility errors.
When I open the project's Properties the Targeting area shows:
Target: Universal Windows
Target Version: Windows 10 Fall Creators Update (10.0; Build 16299)
Min Version: Windows 10 Fall Creators Update (10.0; Build 16299)
I am developing on Windows 10 Enterprise Version 1703 (OS Build 15063.1155)
I'm pretty clueless here. I've been Googling this but the answers seem to involve updating the OS
If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.
|
|
|
|
|
What is the best way to integrate cryptocurrency price checker into web page?
|
|
|
|
|
Hey! The website already exists or you will create it, and do you have any examples of what kind of price checker you would like to integrate, because I have created an web version of crypto tracking app
|
|
|
|
|
No I am creating it from 0 point right now, I have checked some ideas from my possible competitors. The thing is I want integrate real time charts that would e visually attractive
|
|
|
|
|
Could you please give me some visual examples or sites so that I understand the concept and I can give my opinion and integrate my expoerience 
|
|
|
|
|
Since this information is shown on stock websites, I think that this is possible.
|
|
|
|
|
Message Removed
modified 22-Jun-18 14:02pm.
|
|
|
|
|
I've tried downloading jdk-8u161-windows-x64 and jdk-8u162-windows-x64 and they dont pop up in my folders when i browse for files to insert, i have an asus notebook could i ave possibly downloaded the wrong bit for the program or have i downloaded the wrong file all together? Please help, -Rookie
|
|
|
|
|
It does not depend upon the manufacturer of your machine, rather the architecture they have manufactured. On Windows machine, go to PC properties, and check what OS you have. If it says something like, x64, then you have it right otherwise consider the 32-bit version of the JDK.
Secondly, Oracle website has the content that you need, Java SE Downloads - NetBeans + JDK Bundle, there you get the NetBean and JDK version installed together.
Remember, — apart from the pain that Java programming causes — the most painful part of Java development is being told that JDK is not found. The main issue of this is that you might have not set the JAVA_HOME environment variable, you need to have that set in order to allow your Java programs to run successfully.
Installingthe JDK Software and Setting JAVA_HOME (Using the GlassFish ESB Installation CLI)
Apart from these, I do not see any reason what might cause NetBeans to not start and cause an issue with your, or due to you JDK. If this does not resolve the problem please share the error message you get.
The sh*t I complain about
It's like there ain't a cloud in the sky and it's raining out - Eminem
~! Firewall !~
|
|
|
|
|
Does anyone know of an app that can read a QR code and can access the device's unique ID (either phone number, mac address, or...).
EDIT ===================
On the other hand, I suppose I could use a cookie (that expires after 24 hours or something like that) to identify a device...
".45 ACP - because shooting twice is just silly" - JSOP, 2010
-
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-
When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
modified 11-Oct-17 13:25pm.
|
|
|
|
|
|
I designed a web site with address: [LINK DELETED] why google give NOT Friendly Mobile error?
please explain to me about ,why cann't use at friendly mobile ? why send error from google to me about this subject?
|
|
|
|
|
I've let your message through, but deleted the link as it looks very much like site driving spam, which is why it was sent to moderation in the first place.
Given how long you have been here, I don't think it was deliberate but please do not link to your site again or the more trigger happy among us will start the process of banning you from this site.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
|
|
|
|
|
I do not quite understand the essence of your problem
|
|
|
|
|
We get a lot of spam (nearly 14 million members is a tasty target for those that don't like to pay for advertising, and some of it is decidedly NSFW) and so we have a automated system which looks at everything that is posted. If it thinks it looks like spam, it goes to a special queue where us human volunteers get the final decision: let it through, or kill it and squash the poster like a bug.
When a member posts something that looks like spam but it isn't intentional, we can let it through or squash, no other options - so in this case, I let it through, and then had to chase it down and edit it to remove the link. If I hadn't, then some other member might consider it spam and start the "kick 'em off" process. Or I squash the message, and the process of kicking the member off the site starts, which is hardly fair for a simple mistake.
But that wastes my time, so I add a quick warning so the member doesn't do it again, and I can go on my way.
You would not believe the amount of spam a single spambot can generate when it tries hard: thousands of messages a minute, which mean that nothing legitimate gets to be seen, and it's a real PITA to clean up. Hence the automated system with very necessary human supervision!
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
|
|
|
|
|
|
With my project (Coco2d-x) open in Xcode and my (registered developer) Apple account as the [Team] the system does not recognise the iPhone (logged into iCloud with my registered developer account) when it is plugged into the usb.
If I switch my [Team] in Xcode to 'None' or use a non-developer registered AppleID as the [Team] the iPhone is recongised.
Please tell me what steps I need to take to allow Xcode to 'see' the phone when I am using my 'proper' developer AppleID?
Thanks
AndyF.
|
|
|
|
|
|
pongky zone wrote: ...new phone with good machine?
Do you have a question regarding mobile development?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
|
|
|
|
|
No, it's site driving spam.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
