Question :- How To fast render data using katex in react native?
Description :- I am using Katex, When app is run then katex data is shown after 2-3 seconds. How it is fast like app is run then data is visible not time delay.
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I'm currently trying to create an app which makes use of the ReplayKit Live feature to broadcast the iPhone screen to a service which I want to provide by myself (basically something similar to what Teamviewer QuickSupport is doing).
I do know how to create the extension by itself, however, I do not have enough information on how the best way would be to process these informations and upload it to the backend. I did search a lot but without any success:
https://forums.developer.apple.com/thread/52434 - This is basically the same question I have but sadly without any answer
So my question is: Does anyone have any insight on how the video sample buffer (made available by processSampleBuffer) could be processed and uploaded on a backend without inducing large delays?
I am building an IOS application using Flex 4.6 and AIR 3.3. I do have some Objective-C Libs that we will be using for processing audio, images, and video to create a new "video" file.
Being that we are doing all this processing on the device through a native extensions I am wondering if the user is going to see the app lock up till the processing is complete. In other words am I going to need to show them a progress bar and not allow them to do anything else in the app till this is complete OR does native extension code run in a separate thread ?
A secondary question would be ... If Native Code does not run in a separate thread is it possible to use the new Actionscript Workers to offload the processing to a separate thread ?
Your ANE can invoke a new thread, so your app shouldn't lock up.
This is a very good reference for developing native extensions: http://help.adobe.com/en_US/air/extensions/air_extensions.pdf
To quote the relevant part:
"The native C code can dispatch asynchronous events back to the ActionScript side of your extension. For example, an extension method can start another thread to perform some task. When the task in the other thread completes, that thread calls FREDispatchStatusEventAsync() to inform the ActionScript side of the extension. The target of the event is an ActionScript ExtensionContext instance."
Regarding the worker threads, yes, that's exactly what worker threads are for and from what I've read from the AS3 implementation, it'll work just like that. However, my best bet is that using an ANE will be faster for such tasks than using AS3. If you have the libs ready to roll, I'd just use an ANE and maybe try the worker threads once released for fun, might be easier to maintain if you're mostly developing in AS3.
I'm having a problem with the app I'm building the RAM of the BB 9800 is too small.
I have a html5 application that I use in IOS and Blackberry.
I'm using phonegap plugin to pull data form server by using Sybase.
On IOS everything runs fine but on blackberry I frequently get a message "low on memory, please stop applications" and the only app running is mine. And usually this is followed by "app closing because its too big".
How can I either increase the memory available for my app (unlikely)
or decrease the amount my app is using (tips and guide lines)
I'm using:
Sencha Touch for our interface
Phonegap to access the native api
Sybase to do the sync between our local data and the server data
No toolkits - only one is sencha touch
everything is loaded at index.html - no ajax at all
index.html is a local file - no request loading
Sencha does the DOM stuff - not all screens in one main DOM - the screens are created on demand.
You mention you pull data from Sybase - is that when you get that memory error?
Unfortunately sencha/phonegap/sybase sync/your js will take memory (specially since it's all in one page), and those frameworks are big enough to cause troubles...
My suggestions:
if the error happens only when you load data, the question is how much data are you loading? maybe it's trying to download 1gb of data and trying to do that in memory? I would look into server-side paging to reduce your data-footprint
try to split into multiple .html pages each doing a subset of the work you are now doing in one big file...
Hope this helps
We have been developing an application which can consume a large amount of data (say tables/proxys with 4000 + rows) in Sencha Touch.
When we run the application on our desk top computer it works fine however when the application is accessed on an iPad as soon as we get to the data heavy task safari just vaporizes .
Is this a limitation on imposed by Apple or are we getting punished for doing something wrong.
Try to load data as user request it:
http://podlipensky.com/post/2011/01/03/Sencha-Load-data-on-demand.aspx
http://www.sencha.com/forum/showthread.php?120083-Ext.ux.touch.LazyDataView
Also try to use lazy rendering for not-visible-from-start elements. You need to use xtype and json configuration instead of creating new instance of control.
I'm trying to develop a webapp that users can run on their mobile phone to track the distance they've traveled. Think of it as something like RunKeeper, but in webapp form.
The following article describes an easy way to create a Trip Meter with HTML5 and and the Geolocation API.
http://www.html5rocks.com/en/tutorials/geolocation/trip_meter/
However, this just seems to calculate the distance between point A and point B. I suppose I could use something like JavaScript's setTimeout to track the distance traveled every 5 seconds, then calculate the total at the end. However, when the webapp is running in the background (or the phone is locked), this JS won't be executed. Is there any sort of solution to this problem?
You don't need to use setTimeout, the watchPosition will fire the callback function every time the location is updated. However, you are correct that the JavaScript will only run when the web app is not in the background and the phone is not locked. You may be able to write an HTML5 app then convert it to native with something like PhoneGap.