How can I detect termination of a react native app so I can do some cleanup? Currently I only care about this for Android.
You can check AppState Api , it'll tell you about app state like active, background and inactive
Without custom modifications I don't think this is possible, you can however try to trigger your react native code in the native handler for when a view gets destroyed... If possible, you should implement a waiting loop there that can be stopped when your react native cleanup is done.
PS: I did not yet try this out myself!
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I am developing a library consisting of React Native components and this library is used by a React Native application. I have a problem where I want to avoid rendering WebViews during transitions since it is causing crashes on Android. My problem occurs when the application switches to a new screen and renders a component from this component library. The component adds listeners for transitionEnd and beforeRemove. And the problem is that the transitionEnd listener doesn't always seem to get initialised soon enough for me to be able to recognise that the transition has ended and I am not able to determine if I can safely render a WebView.
Do you see a solution that already exists in react-navigation or is this perhaps a feature that should exist?
Part of our React Native App lets users use it in the background while they use other apps.
If the user then force quits the app while our app is in the background we want to do some cleanup and send some analytics. Since we can't get the applicationWillTerminate event in React Native we need to do this cleanup in the native side.
So we were wondering if there is a way to access the Redux store in this event. Or what is the suggested way to handle this?
I have an app that I am developing in React Native, using Expo. When I make a change to a deeply nested screen, I have to navigate back to that screen to check my changes.
Is it possible to configure React Native or Expo to go back to that screen after a reload?
I'm not sure if it matter, but I'm also using React-Navigation.
What I usually do is just switch the routes in the navigator config so that deeply nested screen is the first route... then you can work on it and make changes, and when you’re done just reset the routes to what they’re supposed to be. Does that make sense?
Try Running the app on a live device , Changes will be reflected directly on screen rather than going to root
Do compiled Expo.io React Native applications support "Always On" background location tracking, even when the app is not in use?
Expo just implemented Background Location
Instead of using the watchPositionAsync method, you will have to utilize TaskManager.defineTask method to register the background task out outside of the React event loop. Then, start the task with Location.startLocationUpdatesAsync.
Short answer is no. Quoting the "Why not expo" page:
Expo apps don’t support background code execution (running code when
the app is not foregrounded or the device is sleeping). This means you
cannot use background geolocation, play audio in the background,
handle push notifications in the background, and more. This is a work
in progress.
You will need to detach your app and add this behavior yourself, still doing so you lose some of the expo capabilities.
Thanks for help.
I have an idea.
obj-c processes notification and pass the content to rn.
And I will try this.
I don't think you can do anything after the app is killed (because it's killed !).
What you can observe though is when the app goes in background / get back focus. See AppState API in React Native. http://facebook.github.io/react-native/docs/appstate.html#content