I want an app that can be opened automatically or by itself when app notification appears. I've been looking for this case but I don't find any solution.
This is not possible on iOS. You can not programmatically open an app based on a notification.
What you can do is to use silent pushes (those are push notifications that are invisible to the user) to wake up your application in the background. Using this mechanism, you can do some work in your app in the background (like fetching some data so it is instantly available later on).
Depending on your use case, this might be of use to you.
Related
Is there a way to automatically resume a flutter app from a paused or inactive lifecycle state with a background service?
Similar to when the WhatsApp app received a call while it was paused or inactive.
No, you can not simply wake up the app from a service. This would open the door for all kinds of spam apps and security risks. You need to specifically register it as VOIP app using CallKit or something like SIP on Android to receive incoming calls.
For other things you can use push notifications but that won't start your app. The user always has to click on the notification that you display.
You need to use a couple of things together:
Use push notifications to wake up your app:
https://pub.dev/packages/firebase_messaging
To start your app using push notifications refers to this post:
https://stackoverflow.com/a/48405551/4335775
Use CallKit (IOS) or ConnectionServices (Android) to show the upcoming call screen. By the day of this answer there are only a few packages to handle these things, here is one that can handle both platforms:
https://pub.dev/packages/flutter_callkeep
If you want a completely different thing and need to run some background process, there are bunch whole of things you should know first. I suggest beginning here: https://flutter.dev/docs/development/packages-and-plugins/background-processes
Here is a usefull package to work with background processes that should be constantly running:
https://pub.dev/packages/background_fetch
The app can only be waked up with explicit commands. The user must hit the button. And there are ways to handle the input, messages may pass parameters, you can save the previous state in the database or shared preferences, etc.
Since few days i am searching for the functionality which will allow me keep user posted that application is running in background. I have attached a !image for what exactly i am looking for. i tried googling but could not get exactly what I need. when i tap on the flashing red bar it takes me back to the application.
Thanks in advance.
The red banner you pictured is provided by the system, is shown only if your application uses background audio recording (see AVAudioSession), and doesn't provide the opportunity for you to choose what happens when the user taps it.
Unless your app fits into one of a few specific classes, it doesn't actually "run" while in the background. Instead, it's "suspended" -- still in memory, but gets no CPU time. What happens outside of your app is thus up to the system, not to you... the only way to show a banner that will launch your application is to use a push notification service or UILocalNotification, but those banners are only shown briefly, and you don't get to control their duration. What you seem to be specifically asking for isn't possible using public API.
The kind of notification you want isn't supported by the current iOS for third-party developers.
If you want that kind of functionality then implement Apple Push Notification service through
this you can first give message to Apple push notification service. then Apple service
automatically generate notification for your App as you want.
I am writing an alarm clock app for iphone, and I want it to turn on the phone(from standby mode) approx 1hr before the alarm is supposed to go off.
Then I want the app to be active, so I can stream content live without the user having to put the phone in an active-mode.
Any way for an app to switch out of standby?
Without using private api an application can only present alertview (via local or push notification).
And only when user taps "view" button this application can be activated. You can see that in the link you provided - (second to last screenshot)
True, you can always add sound to this notifications - so alarm app can work (and there are many out there) but it can't send itself in the foreground.
Nope that cant be done, once the app went to the background state you lose control on it, and cannot bring it back
There might be a way using notifications. Check this SO question for more info:
Alarm Even Application Closed in iPhone
I have requirement for an application which work in background only.
When first time application install on device then after installation that will be go to background. And after two minutes a view will popup on screen.
Now problem is that after installation how to redirect application into background?
i get answer for this that if we want to send our app into background then we have to open another app like as safari. so i get this solution.
Now problem is that how show a view after two minutes from background. I have to create as a demo not for app store. So if anyone have any solution then suggest me.
Thanks
It is not possible to do so in iOS. You can't send an app into the background
If you want your app to get displayed, the only way to do so is through push (from server) or local (from phone) notifications, and the user has to explicitly accept it.
Unfortunately, you can't make it open automatically.
iOS is not designed to run code in the background. There are a few exceptions, for example a music streaming app, or a GPS navigation app, but in general it cannot be done.
Instead, you should run your app on a server in the cloud, and send a push notification to the phone when you want something to happen on the phone. You may also be able to achieve this with "local notifications", depending on what you're trying to do.
I'm wondering if there is any way of retrieving the last-received push notification if the app is launched from the home screen instead of by pressing the 'View' button on the notification.
The app we're writing is for dealing with sensitive data, and it's important to be able for the central server to be able to remotely disable a client at will, without having the requirement that the app needs an internet connection to launch.
The basic idea I came up for this would be to send a push notification with a custom payload letting the app know to disable itself until it can properly sync its data.
This would work if the user pressed View on the notification, but not if they cancelled it and then launched the app separately.
I'd love to know if this is possible, or otherwise if there's a better way to implement this functionality.
It's not possible. Your app would have to connect to the server on launch and get its latest status from there. If your use case is that sensitive, push notifications are probably not reliable enough anyway because Apple does not guarantee that a push notification will actually be delivered.
Like Ole said, not possible.
Note that you shouldn't be relying on push notifications for anything like this. From Apple's push notifications programming guide:
Remember that delivery of notifications is “best effort” and is not guaranteed.