Flutter How to show splash screen only while loading flutter data

Question

While the app's splash screen is displayed, it needs to download files from the FTP server and process data. Implemented splash screen for flutter

class Home extends StatelessWidget {
  const Home({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {

    return FutureBuilder(
      future: Future.delayed(Duration(seconds: 3)),
      builder: (BuildContext context, AsyncSnapshot snapshot){
        if(snapshot.connectionState == ConnectionState.waiting)
          return SplashUI();    ///Splash Screen
        else
          return MainUI();       ///Main Screen
      },
    );
  }
}

Now, with a delay of 3 seconds, the startup screen is displayed for 3 seconds, during which time the file is downloaded from FTP and data is processed. I want to keep the splash screen until the completion of data processing rather than the specified time.

Splash Screen


Widget _splashUI(Size size){
    return SafeArea(
      child: Center(
        child: Container(
          width: size.width * 0.5,
          height: size.height * 0.1,
          child: Image(
            fit: BoxFit.fill,
            image: AssetImage('assets/images/elf_logo.png'),
          ),
        ),
      ),
    );
  }

 Widget build(BuildContext context) {

 getFtpFile();
 dataProgress();

 return Platform.isAndroid ?
    MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: _splashUI(_size),
      ),
    ) :
    CupertinoApp(
      debugShowCheckedModeBanner: false,
      home: CupertinoPageScaffold(
        child: _splashUI(_size),
      ),
    );
 }

I want to know how to keep SplashScreen while processing data rather than handling SplashScreen with delayed. thank you.

score 6 · Answer 1 · answered Feb 24 '22 at 12:53

The package flutter_native_splash does exactly what you are asking for. Make a call to FlutterNativeSplash.preserve() before your runApp() to keep the splash on screen, then FlutterNativeSplash.remove(); when your download completes:

import 'package:flutter_native_splash/flutter_native_splash.dart';

void main() {
  WidgetsBinding widgetsBinding = WidgetsFlutterBinding.ensureInitialized();
  FlutterNativeSplash.preserve(widgetsBinding: widgetsBinding);
  runApp(const MyApp());
}

// when your download is completed, remove the splash screen:
    FlutterNativeSplash.remove();

Full disclosure: I maintain this package.

score 5 · Accepted Answer · answered Feb 24 '22 at 02:51

to keep SplashScreen while processing data rather than handling SplashScreen with delayed.

Why not change the delayed?

class Home extends StatelessWidget {
  const Home({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {

    return FutureBuilder(
      future: _processingData(),
      builder: (BuildContext context, AsyncSnapshot snapshot){
        if(snapshot.connectionState == ConnectionState.waiting)
          return SplashUI();    ///Splash Screen
        else
          return MainUI();       ///Main Screen
      },
    );
  }

  Future<List> _processingData() {
    return Future.wait[
      _getFtpFile(),
      _dataProgress(),
    ];
  }
}

thank you. Your answer solved the problem. – Jungwon Feb 24 '22 at 03:43 — Jungwon, Feb 24 '22 at 03:43

score 1 · Answer 3 · answered Feb 24 '22 at 02:35

1

You could do like other people have done in the past; you should make both of your methods getFTPFile and dataProgress return a Future, then you wait for both Futures using Future.wait, as in this answer https://stackoverflow.com/a/54465973/871364

Future.wait([
   getFTPFile(),
   dataProgress(),     
], () {
  // once all Futures have completed, navigate to another page here
});

answered Feb 24 '22 at 02:35

Roman Jaquez

2,499
1
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thank you. Your answer solved the problem. – Jungwon Feb 24 '22 at 03:43

Flutter How to show splash screen only while loading flutter data

3 Answers3