There are many 'Apple Device Finder' Apps in the store. Many of them help the user to ring the iphone even when the phone is in silent mode. I am trying to find out how this is achieved. How can we play sound on the iPhone which is the silent mode. Anyone knows the Apple-supported Framework or library to achieve this. I have not found any threads on how can an app makes phone ring on silent mode and even in the app killed state. Please help me.
I actually doubt that's possible. I think just iCloud "Find my iPhone" feature is able to do that.
For example, TuneIn alarm feature requires app to be open. If you kill the app, effectively it can't do anything. The only thing it would be able to do is to receive a push notification; but that's not handled by the app itself, but the OS.
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I want to know whether we can get power off or on events in iphone. In other platforms like Android, BREW we will get a notification to our app saying the phone is turned ON. Is it possible in iphone?
Thanks
Jithendra
Short answer: no.
Your app isn't running on power-on, so there's nothing to notify. (A special case here would be apps registered as VoIP clients. But you still can't tell whether the handset just started or whether your app was killed for some other reason and then restarted.)
And when iOS shuts down it will send KILL signals to any background running tasks. You can't intercept them, so that doesn't really help you. (And even if you could, again, it doesn't say why your app is being killed.)
I wrote my first iPhone App, and managed to get it into the App store. I later discovered a bug that happens on a real device but not on my emulator. I have committed a fix (changed plist to prevent app running in background), but I don't really understand why it happened.
My App allows users to record a sound-byte, however while they are recording they can use the iPhone home button to move the app to the background, and then it can keep recording forever if they don't restart the phone or the app does not crash.
My impression from everything I have read, is that this should not happen as you have to ask for background audio specifically if you want to do this, but now it appears to me that you have to ask specifically to disable it.
Could anyone explain this to me?
The iOS App lifecycle is described in Apple's iOS App Programming Guide.
The App is given the opportunity to save data and otherwise stop things that don't need to be running, before being suspended. You can request extra time doing this by using beginBackgroundTaskWithExpirationHandler:.
If you want your app to stop doing its "normal thing" when it is put into the background then you need to detect the App state transition and stop it yourself.
Let's say the user leaves the phone on the table. (probably on home screen)
A few hours later, he picks it up. And when it does, the iPhone detects the accelerometer, and it rings.
Unfortunately, this is not possible. Once the OS goes to the home screen, applications running in the background have a limited set of options.
Read this article for more information: http://developer.apple.com/library/ios/#DOCUMENTATION/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html
Not through officially accepted means (i.e. you could do it on a jailbroken phone conceivably). Primarily, you can't run in the background for that purpose. If the app was running in the foreground, you can easily detect motion and perform an activity - but if the phone is left for too long a period without activity, it will sleep.
Unfortunately, the accelerometer is not one of the specified keys in the UIBackgroundModes option in your apps info.plist.
auido, location and voip are the only ones available for now.
short answer: YES
The trick is to make sure the app doesn't get backgrounded when the phone goes to sleep. The other elements like detecting changes in the accelerometer and playing a sound are all standard features.
As for the no sleep solution, it has been asked before, basically is you play a music sample the app will continue running, so perhaps a loop of silence continuously played.
Only if you left an app designed for that purpose running in the foreground.
It won't be possible if your app is running in the background.
I'm building a little dialing program for my kids so that only 4 "safe" numbers are available for them to dial. I'd like to start the app, hand them the phone and have the app be the only thing running until they come back home.
Is there a way to keep the application running and prevent the iPhone from shutting down the app?
The iPhone SDK does not allow this. Any application can be exited when the user presses the home button. In fact if your program takes too long to exit (e.g. infinite loop) it will forcefully close your application.
If you must have this behavior, your best bet would be to jailbreak the phone in which case anything could pretty much be done.
Not with Apple's SDK, no.
I want to run two app simultaneously, I am using jailbroken phone and dont want to upload that app to the app store.
Is there any way so that I can log phone call time, this can only be done if my "logging app" is running in background.
Please suggest me, how can I do this on jailbroken phone.
Some thing like:http://msdn.microsoft.com/en-us/library/ms884959.aspx (its for windows)
Is this actually a programming question, or are you asking for an app that logs call times?
Assuming the former, you would write a iPhone program that hooks into current phone conversations some way (private APIs? Not sure if this is indeed possible, just assuming.) You would then run your app via Backgrounder or some other wrapper that provided an interface for multiple applications to run at the same time. This usually comes at the cost of increase battery life, depending on how much CPU (and maybe memory?) the backgrounded app consumes.
Backgrounder is available via Cydia, I believe.
Need to include CoreTelephony, will solve the issue