启动画面卡住并且从不显示 main.dart Flutter

Question

运行我的应用程序后，它会显示启动屏幕并且永远不会消失。即使我关闭并重新启动应用程序，甚至我通过

flutter run

运行

Flutter run lib/main.dart

也只显示启动画面，我还添加了

WidgetsFlutterBinding.ensureInitialized();

但仍然没有任何效果。尝试像

flutter clean

和

flutter pub get

这样的一切，我还没有使用任何启动画面包。请任何人都可以找出问题所在。 启动应用程序后，我在下面添加了我的

terminal

。

再次感谢。

W/FlutterActivityAndFragmentDelegate(18992): A splash screen was provided to Flutter, but this is deprecated. See flutter.dev/go/android-splash-migration for migration steps.
E/flutter (18992): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(null-error, Host platform returned null value for non-null return value., null, null)
E/flutter (18992): #0      FirebaseCoreHostApi.optionsFromResource (package:firebase_core_platform_interface/src/pigeon/messages.pigeon.dart:246:7)
E/flutter (18992): <asynchronous suspension>
E/flutter (18992): #1      MethodChannelFirebase.initializeApp (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:89:25)
E/flutter (18992): <asynchronous suspension>
E/flutter (18992): #2      Firebase.initializeApp (package:firebase_core/src/firebase.dart:43:31)
E/flutter (18992): <asynchronous suspension>
E/flutter (18992): #3      main (package:pdfscanner/main.dart:7:3)
E/flutter (18992): <asynchronous suspension>
E/flutter (18992): 

我的

main.dart

看起来像这样：

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(
    MaterialApp(
      debugShowCheckedModeBanner: false,
      title: "Document Scanner",
      home: HomePage(),
    ),
  );
}

这是我在android主流中的

build.gradle

   buildscript {
    ext.kotlin_version = '1.6.10'
    repositories {
        google()
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:7.1.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.15'
    }
}

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

Answer 1

此处为

terminal

上的第一个错误说

A splash screen was provided to Flutter, but this is deprecated. 
See flutter.dev/go/android-splash-migration for migration steps.

这是通过删除

<meta-data/>

上的

AndroidManifest.xml

片段来解决的，即：

          <meta-data
              android:name="io.flutter.embedding.android.NormalTheme"
              android:resource="@style/NormalTheme"
              />
          <meta-data
              android:name="io.flutter.embedding.android.SplashScreenDrawable"
              android:resource="@mipmap/launch_image" 
              />

对于

error

上的

terminal

的这些部分，即：

E/flutter (18992): #0      FirebaseCoreHostApi.optionsFromResource (package:firebase_core_platform_interface/src/pigeon/messages.pigeon.dart:246:7)
E/flutter (18992): <asynchronous suspension>
E/flutter (18992): #1      MethodChannelFirebase.initializeApp (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:89:25)
E/flutter (18992): <asynchronous suspension>
E/flutter (18992): #2      Firebase.initializeApp (package:firebase_core/src/firebase.dart:43:31)
E/flutter (18992): <asynchronous suspension>
E/flutter (18992): #3      main (package:pdfscanner/main.dart:7:3)
E/flutter (18992): <asynchronous suspension>
E/flutter (18992):

我只需删除

await Firebase.initializeApp();

就在该行之后

WidgetsFlutterBinding.ensureInitialized();

在

main.dart

上，这样我就可以再次看到我的主要

home_page.dart

。一切正常。

Answer 2

在

app

级别

build.gradle

添加这个肯定会解决问题。

dependencies {
    classpath 'com.android.tools.build:gradle:7.3.0'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    classpath "com.google.gms:google-services:4.3.15"   // this makes all the difference
}