Flutter 应用程序在发布时卡在初始屏幕上

如何解决Flutter 应用程序在发布时卡在初始屏幕上

我的 Flutter 应用程序的发布版本遇到了一个奇怪的问题。启动画面将永远开启，应用程序不会显示主屏幕。但是，当我使用 flutter run --release 运行它时，该应用程序运行良好。

这是我的AndroidManifest

<activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <!-- Specifies an Android theme to apply to this Activity as soon as
                 the Android process has started. This theme is visible to the user
                 while the Flutter UI initializes. After that,this theme continues
                 to determine the Window background behind the Flutter UI. -->
            <meta-data
              android:name="io.flutter.embedding.android.NormalTheme"
              android:resource="@style/NormalTheme"
              />
            <!-- Displays an Android View that continues showing the launch screen
                 Drawable until Flutter paints its first frame,then this splash
                 screen fades out. A splash screen is useful to avoid any visual
                 gap between the end of Android's launch screen and the painting of
                 Flutter's first frame. -->
            <meta-data
              android:name="io.flutter.embedding.android.SplashScreenDrawable"
              android:resource="@layout/splash_screen"
              />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
            <intent-filter>
                <action android:name="FLUTTER_NOTIFICATION_CLICK" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

这是我的MainActivity.kt

package ...

import android.content.Context
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.android.SplashScreen
import io.flutter.plugins.GeneratedPluginRegistrant




class MainActivity: FlutterActivity() {
    override fun provideSplashScreen(): SplashScreen? {
        return AppSplashScreen()
    }
}

class AppSplashScreen: SplashScreen{
    override fun createSplashView(context: Context,savedInstanceState: Bundle?): View? {
        return LayoutInflater.from(context).inflate(R.layout.splash_screen,null,false)
    }

    override fun transitionToFlutter(onTransitionComplete: Runnable) {
        onTransitionComplete.run();
    }

}

这是我的Application.java

package ...;

import io.flutter.app.FlutterApplication;
import io.flutter.plugin.common.PluginRegistry;
import io.flutter.plugin.common.PluginRegistry.PluginRegistrantCallback;
import io.flutter.plugins.GeneratedPluginRegistrant;
import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService;
import io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin;


public class Application extends FlutterApplication implements PluginRegistrantCallback {
    @Override
    public void onCreate() {
        super.onCreate();
        FlutterFirebaseMessagingService.setPluginRegistrant(this);
    }

    @Override
    public void registerWith(PluginRegistry registry) {
        FirebaseMessagingPlugin.registerWith(registry.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin"));
    }
}

此外，当我在手机上安装该应用程序时，我看到了同样的问题，但是当我从 flutter 运行它时，它工作正常。 注意：iOS 版本运行正常

解决方法

如果你想在 Flutter 中实现原生启动画面，你可以尝试这样的事情。

请检查以下代码以获取 MainActivity.kt

class MainActivity: FlutterActivity() {
    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        super.configureFlutterEngine(flutterEngine)
        Thread.sleep(3000)
    }
}

请检查以下代码以获取 styles.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
        <!-- Show a splash screen on the activity. Automatically removed when
             Flutter draws its first frame -->
        <item name="android:windowBackground">@drawable/launch_background</item>
    </style>
</resources>

请检查以下代码以获取 launch_background.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Modify this file to customize your launch splash screen -->
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/bg_splash"/>
</layer-list>