Flutter & Shared_Preference & Intro Slider: Shared_Preference menghasilkan pengecualian

Question

Flutter & Shared_Preference & Intro Slider: Shared_Preference menghasilkan pengecualian. Saya ingin membuat slider perkenalan. Jadi saya menggunakan shared_preference (Mendeteksi jika pengguna menggunakan aplikasi untuk pertama kalinya) dan plugin intro_slider untuk membuatnya. Untuk beberapa alasan, saya mendapat kesalahan pengecualian ini, yang langsung menghentikan emulator saya. Dengan kata lain, aplikasi telah diinstal tetapi saya dikeluarkan dari aplikasi dan proses yang saya jalankan berhenti begitu saja.

Karena aplikasinya sudah terpasang, saya mencoba membukanya secara manual. Dan itu bekerja dengan baik.

Mengapa proses yang saya jalankan berhenti? Mengapa saya dikeluarkan dari proses tersebut?

Kode utama

import 'package:PhotoEarn/screens/wrapper.dart';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'introduction_slider/introduction_slider.dart';

class AppStarter extends StatefulWidget {
  @override
  _AppStarterState createState() => _AppStarterState();
}

class _AppStarterState extends State<AppStarter> {
  @override
  void initState() {
    super.initState();
    //  checkIsFirstTime();
  }

  Future<Widget> checkIsFirstTime() async {
    final SharedPreferences prefs = await SharedPreferences.getInstance();
    final bool isFirstTime = prefs.getBool('isFirstTime');

    // check is null or true
    if (isFirstTime == null || isFirstTime) {
      prefs.setBool('isFirstTime', false);
      Navigator.pushReplacement(
        context,
        MaterialPageRoute(
          builder: (context) => IntroductionSlider(),
          //builder: (context) => ImageEvaluation(),
          //builder: (context) => CameraTwo(),
        ),
      );
    } else {
      Navigator.pushReplacement(
        context,
        MaterialPageRoute(
          builder: (context) => Wrapper(),
          //builder: (context) => ImageEvaluation(),
          //builder: (context) => CameraTwo(),
        ),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold();
  }
}

Pesan eror

(base) Punreachs-MacBook-Pro:PhotoEarn punreachrany$ flutter run Using hardware rendering with device AOSP on IA Emulator. If you notice graphics artifacts, consider enabling software rendering with "--enable-software-rendering". Launching lib/main.dart on AOSP on IA Emulator in debug mode... Running Gradle task 'assembleDebug'... Running Gradle task 'assembleDebug'... Done 7,2s ✓ Built build/app/outputs/flutter-apk/app-debug.apk. Installing build/app/outputs/flutter-apk/app.apk... 3,2s Waiting for AOSP on IA Emulator to report its views... 4ms D/EGL_emulation( 8483): eglMakeCurrent: 0xdc517240: ver 3 0 (tinfo 0xdc4a6d00) D/eglCodecCommon( 8483): setVertexArrayObject: set vao to 0 (0) 1 0 I/sterable.pe.an( 8483): Rejecting re-init on previously-failed class java.lang.Class<com.google.firebase.messaging.FirebaseMessagingService>: java.lang.VerifyError: Superclass com.google.firebase.iid.zzb of com.google.firebase.messaging.FirebaseMessagingService is declared final (declaration of 'com.google.firebase.messaging.FirebaseMessagingService' appears in /data/app/com.oysterable.pe.and-x4wuluezItpEc-2nGrSGUg==/base.apk!classes3.dex) I/sterable.pe.an( 8483): at java.lang.Class java.lang.VMClassLoader.findLoadedClass(java.lang.ClassLoader, java.lang.String) (VMClassLoader.java:-2) I/sterable.pe.an( 8483): at java.lang.Class java.lang.ClassLoader.findLoadedClass(java.lang.String) (ClassLoader.java:738) I/sterable.pe.an( 8483): at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:363) I/sterable.pe.an( 8483): at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312) I/sterable.pe.an( 8483): at android.app.Service android.app.AppComponentFactory.instantiateService(java.lang.ClassLoader, java.lang.String, android.content.Intent) (AppComponentFactory.java:103) I/sterable.pe.an( 8483): at android.app.Service androidx.core.app.CoreComponentFactory.instantiateService(java.lang.ClassLoader, java.lang.String, android.content.Intent) (CoreComponentFactory.java:66) I/sterable.pe.an( 8483): at void android.app.ActivityThread.handleCreateService(android.app.ActivityThread$CreateServiceData) (ActivityThread.java:3514)
I/sterable.pe.an( 8483):   at void android.app.ActivityThread.access$1300(android.app.ActivityThread, android.app.ActivityThread$CreateServiceData) (ActivityThread.java:199)
I/sterable.pe.an( 8483):   at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1666) I/sterable.pe.an( 8483): at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:106) I/sterable.pe.an( 8483): at void android.os.Looper.loop() (Looper.java:193) I/sterable.pe.an( 8483): at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6669) I/sterable.pe.an( 8483): at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2) I/sterable.pe.an( 8483): at void com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run() (RuntimeInit.java:493)
I/sterable.pe.an( 8483):   at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:858)
I/sterable.pe.an( 8483):                                                
D/AndroidRuntime( 8483): Shutting down VM                               
E/AndroidRuntime( 8483): FATAL EXCEPTION: main                          
E/AndroidRuntime( 8483): Process: com.oysterable.pe.and, PID: 8483      
E/AndroidRuntime( 8483): java.lang.VerifyError: Superclass com.google.firebase.iid.zzb of com.google.firebase.messaging.FirebaseMessagingService is declared final (declaration of 'com.google.firebase.messaging.FirebaseMessagingService' appears in /data/app/com.oysterable.pe.and-x4wuluezItpEc-2nGrSGUg==/base.apk!classes3.dex)
E/AndroidRuntime( 8483):        at java.lang.VMClassLoader.findLoadedClass(Native Method)
E/AndroidRuntime( 8483):        at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:738)
E/AndroidRuntime( 8483):        at java.lang.ClassLoader.loadClass(ClassLoader.java:363)
E/AndroidRuntime( 8483):        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
E/AndroidRuntime( 8483):        at android.app.AppComponentFactory.instantiateService(AppComponentFactory.java:103)
E/AndroidRuntime( 8483):        at androidx.core.app.CoreComponentFactory.instantiateService(CoreComponentFactory.java:66)
E/AndroidRuntime( 8483):        at android.app.ActivityThread.handleCreateService(ActivityThread.java:3514)
E/AndroidRuntime( 8483):        at android.app.ActivityThread.access$1300(ActivityThread.java:199) E/AndroidRuntime( 8483): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1666)
E/AndroidRuntime( 8483):        at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime( 8483):        at android.os.Looper.loop(Looper.java:193)
E/AndroidRuntime( 8483):        at android.app.ActivityThread.main(ActivityThread.java:6669)
E/AndroidRuntime( 8483):        at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime( 8483):        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) E/AndroidRuntime( 8483): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) I/Process ( 8483): Sending signal. PID: 8483 SIG: 9 Lost connection to device. Syncing files to device AOSP on IA Emulator... Could not update files on device: HttpException: Connection closed before full header was received, uri = http://127.0.0.1:55559/9hULGLtexbI=/ Syncing files to device AOSP on IA Emulator... (base) Punreachs-MacBook-Pro:PhotoEarn punreachrany$ 

Answer 1

Mengapa proses yang saya jalankan berhenti? Mengapa saya dikeluarkan dari proses tersebut?

Selalu ada masalah serupa dalam pengembangan aplikasi seluler. Anda harus terbiasa dengan ini. Sebagian besar jawabannya akan seperti ini:

• mulai ulang IDE,
• flutter pub cache repair,
• flutter clean.