I am using a UIwebview in my iphone app. It is working fine. No memory leaks when you browse websites, google, news etc. But when you start a video in youtube then it shows me many memory leaks (Under AudioToolBox library). How do I fix them. I imported AVFoundation.h and audioToolBox.h and added these frameworks but I am still getting the same problem.
One more thing, I know apple checks no connectivity condition. Means when there is no internet available or connection problem then user must get some message about connection issues. How do you do that? How do i check internet is connected? what kind of message do you show? Alert or something else?
Do I also need to show activity indicator? How do you show that? can you please reply with sample code?
Apple's designated way of checking connectivity is "try it first". If you get connection problems, you can diagnose with their Reachability suite, available here. But always try first, because Reachability can give false negatives in some situations.
As far as UIWebView's memory problems, I don't think you're in a position to do anything about them. Hope they get fixed in iOS5, I guess. If you want to use AVMediaPlayer for rich media, like Safari and UIWebView do, use it directly, rather than going through WebKit.
Related
In the chatbase UI, when I try to filter by a specific platform, there are a large number of platforms that don't mean anything to me. There is no way I can find to remove/clean up these platforms.
Tried reaching out to chatbase support, but they are unresponsive.
Not sure it's a coding problem
again, it's not a coding problem.
I work for Chatbase. I was able to look into your message data and noticed that we are receiving random code snippets in the platform
Okay, here's a complicated one I've been breaking my head over all week.
I'm creating a self service system, which allows people to identify themselves by barcode or by smartcard, and then perform an arbitrary action. I run a Tomcat application container locally on each machine to serve up the pages and connect to external resources that are required. It also allows me to serve webpages which I then can use to display content on the screen.
I chose HTML as a display technology because it gives a lot of freedom as to how things could look. The program also involves a lot of Javascript to interact with the customer and hardware (through a RESTful API). I picked Javascript because it's a natural complement to HTML and is supported by all modern browsers.
Currently this system is being tested at a number of sites, and everything seems to work okay. I'm running it in Chrome's kiosk mode. Which serves me well, but there are a number of downsides. Here is where the problems start. ;-)
First of all I am petrified that Chrome's auto-update will eventually break my Javascript code. Secondly, I run a small Chrome plugin to read smartcard numbers, and every time the workstation is shutdown incorrectly Chrome's user profile becomes corrupted and the extension needs to be set up again. I could easily fix the first issue by turning off auto-update but it complicates my installation procedure.
Actually, having to install any browser complicates my installation procedure.
I did consider using internet explorer because it's basically everywhere, but with the three dominant versions out there I'm not sure if it's a good approach. My Javascript is quite complex and making it work on older versions will be a pain. Not even mentioning having to write an ActiveX component for my smartcards.
This is why I set out to make a small browser wrapper that runs in full screen, and can read smartcard numbers. This also has downsides. I use Qt: Qt's QtWebkit weighs a hefty 10MB, and it adds another number of dependencies to my application.
It really feels like I have to pick from three options that all have downsides. It really is something I should have investigated before I wrote the entire program. I guess it is a lesson learnt well.
On to the questions:
Is there a pain free way out of this situation? (probably not)
Is there a browser I can depend on without adding tens of megabytes to my project?
Is there another alternative you could suggest?
If you do not see another way out, which option would you pick?
we are using the native BlackBerry camera in our app, using the Invoke class to start the camera. We listen for an image being written to the filesystem, and when the user is finished with the camera, we call
Application.getApplication().requestForeground();
inside fileJournalChanged() to get back to our app.
This caused a problem with the camera lingering on the image taking on some devices, some of the time. If you want gory details you can see my post on the BB forums from a while back.
http://supportforums.blackberry.com/t5/Java-Development/restore-invoked-camera-after-deleting-an-image-from-the/m-p/511332
Suffice to say, I am still trying to fix this. Using EventInjector to inject an ESC key press works, however in this question
Getting Event Injector Permission
it is described as a security threat. However this is widely suggested as the way to close the camera and work around other issues. Has anyone had problems using this method to close the camera or to do anything else? Is there a better "best practices" method for closing the camera, as there apparently is in Android (I don't actually know, a senior developer here mentioned it)?
By "problems" I guess I really mean business rules types of problems... app getting blacklisted by an organization, slammed in the app store, etc?
Thanks in advance, this has been troubling me for a while.
I think the biggest problem you'll face is that using event injection requires special application permissions - ApplicationPermissions.PERMISSION_INPUT_SIMULATION to be exact. Since granting an application this permission basically allows it to simulate input events into ANY application at any time, it is considered quite dangerous because a badly-written or intentionally malicious application could do a lot of damage. Therefore many end-users and business do not allow applications that require this permission.
Is there a way to determine what kind of data plan a device has so an app provides a less rich experience if a data plan is not available? I imagine the connector factory would still be able to return me an HTTPConnection but it would cost the user serious money for lots of data, and I'd like to be nice and prevent that.
I thought there would be a way to query device capabilities in the MIDP API, but maybe it's in CLDC?
Since you mention it in your comments, you can probably make a Symbian OS C++ application that only connects via a specific set Wi-Fi access points (and just stay offline if none of these are available) but I can't think of a way to figure out the current user data plan or whether a given Wi-fi network is free.None of that is available in J2ME, at least not until something like JSR 307 is implemented.
You might want to look into how the Nokia IAPInfo API behaves on actual phones (including Sony-Ericsson and Samsung Series60 phones, potentially) since it is the closest thing to what you want.
No there is no way to do this.
As far as I know there is no way to do this. To address this precise issue, on first download we provide a big bold letter warning saying our apps require data plan. You can do something similar.
Or you can provide an option on first download for the user to say whether he has a data plan or not, and provide a degraded user experience if he doesnt. Dont forget to keep this as an option in application settings and allow the user to enable data services later, as he/she may get a data plan and want to use your app.
Perhaps not directly programming related, but definitely product / commercially related. And I can't find a dupe, so I thought I would ask.
I have had a bit of trouble trying to figure out what best to say to people who have called and asked for advice. The Microsoft message is a bit worrying - basically, be worried, lock up everything and hold on tight. Some of the people I have directed towards that route have objected because of what it does to their browsing experience.
The "go get Firefox" message seems to be going down a bit better. What is the real story and what is the best advice to give?
How much actual risk does it pose between now and when MS patches it?
Edit: here are the links that my community seem to be reading...
WSJ
NP
BBC
Switch to another browser, already.
Chrome and Firefox would be my first two choices. Firefox would probably be best for now, just because it has a longer history.
The only way to prevent this on IE is to follow Microsoft's workaround procedures, which will cause a huge headache for users.
Use Firefox
Use NoSript (if you want proper defence in depth). I can simply say 95+% of all client-side exploits requires JavaScript and 90% of the time these are loaded from a 3rd party website. Therefore switching FF and using NoScript is a really good solution.
How much actual risk does it pose
between now and when MS patches it?
If you look at 0days in IE there are bunch of them, and IE got the worst security track. Also it's one of the most targeted application for attackers because there is clear profit in it. Therefore using IE generally not a good idea.
If you have to use IE,
Use protected mode
Use the latest stable version
Keep your windows updated
Run it as least priviliged user
Use a process control and personal firewall application such as Comodo Firewall (process control application if you can use them right can solve many of these problems, but got a massive overhead in user)
Details of previous IE issues, there are lots of them!
http://secunia.com/advisories/product/11/?task=advisories (IE 6)
http://secunia.com/advisories/product/12366/?task=advisories (IE 7)
You can inform them to patch by following some workarounds but as you notice it's not going to save them on the long run.
Apart from switch browser, pay attention to the emergency patch - get it installed.