When I run flutter app it delays for few seconds shows just white screen and then the main page is shown. How can i fix it
There is an entry in the docs about the launch screen.
https://flutter.io/docs/development/ui/assets-and-images#updating-the-launch-screen
Basically you can provide an image to be shown while flutter loads. The framework is not ready at that point though, so this is done on the platform side.
Related
I am using flutter_native_splash package. Which works fine. But what is the difference between using the native splash and a flutter page? Is there any difference regarding performance?
when the flutter app is opened for the first time, there will be white screen for few seconds before any page is displayed.
to tackle that issue, flutter_native_splash can be used. It builds a native splash screen and will be displayed for few seconds until the first UI is drawn in the flutter app.
the native splash screen can also be closed programatically if needed it until some async task is done.
The flutter_native_splash displays the splash screen before the Flutter engine is finished loading. If you use a Flutter page for a splash screen, it will be loaded after the Flutter engine is finished loading and there will be a delay during which a blank white screen will be displayed.
(Full disclosure - I maintain the flutter_native_splash package)
Here you can see the clock app's ui is running behind the gesture. how can i implement this in flutter? I updated flutter to 2.5 but it's not working.
This is the first question I asked on stackoverflow and i couldn't quite get the question layout. sorry for this.
You have to use
await SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);
in your main.dart before runApp.
As per the description of SystemUiMode.edgeToEdge:
Fullscreen display with status and navigation elements rendered over the
application.
Available starting at SDK 16 or Android J. Earlier versions of Android
will not be affected by this setting.
For applications running on iOS, the status bar and home indicator will be
visible.
The system overlays will not disappear or reappear in this mode as they
are permanently displayed on top of the application.
I have created SplashScreens for my Flutter app for both iOS and Android using the native way which is editing the LaunchScreen.storyboard and it is working currently when I run my app but the SplashScreen does not hold long enough and is there a way to programmatically hide the native splashscreen in dart after I am done with some data processing and logic?
The solutions I found online are all flutter apps with SplashScreen that is build using flutter widgets and not the native way...
Even if you build the splash screen if Flutter, you still need to set one in via XCode. Otherwise, the app loads with a momentary plan white screen and Apple rejects it.
If you want to extend the time till the moment data process is over, then you will have to make a replica of LaunchScreen.storyboard in Flutter. The data processing and logic are written in Flutter. There's no way it can tell LaunchScreen.storyboard "I am done". What you can do is though, make a splash screen in Flutter which will look like LaunchScreen.storyboard. And once the data processing is done, you can navigate the user to the desired screen. Since the two screens are same, use won't see the difference and the app will smoothly show the next screen.
Just a word of caution - be careful about extending the timing of launch screen. Apple may reject the app. See if something can be done after the screen load. You can use flutter after layout package for this or the below line will do the trick :
WidgetsBinding.instance
.addPostFrameCallback((_) => myFunction(context));
This thread may help you to delay the screen for XX seconds.
I'm developing an app that works with sensitive information.
One of the requirements is that when a user puts the app in background the content that the app is currently displaying has to be hidden, so if another person navigate through the apps in background he can't see the last screen where the user was.
Any ideas on how to do that?
I tried to show an overlay when the app moves to AppLifecycleState.paused, but it doesn't work for me, the app prints a message if I want but it can't update the UI.
Edit
Shameless plug: i did a library for doing just that as I also needed it:
https://pub.dev/packages/secure_application
Answear
Build is not called after paused, at least on Android.
For Android I used a flutter_windowmanager package (modified to still be able to build on IOS):
https://github.com/neckaros/flutter_windowmanager
When my app need securing I add the flag secure:
FlutterWindowManager.addFlags(FlutterWindowManager.FLAG_SECURE)
And my app is now a black screen in the app switcher.
You should still hide content your way for when the user get back to the app.
Otherwise you can go native:
https://medium.com/#mehmetf_71205/securing-flutter-apps-ada13e806a69
I create a blank project in ionic. I also set splash screen in android platform. I can change the timing for this screen. All goes good.
But what if I want to set splash screen from by database at the time of installing this app. Is it possible or is there any other way.
#gautam It's not possible in Ionic or even any other mobile app developement platform
But you can do like reduce the time of splash screen to zero(0) and in device ready function you can call image from your database.