flutter：android 清单不读取 kotlin 文件（Application.kt）

Question

我试图向我的应用程序暗示 Firebase 云消息传递，我尝试将 MainActvity.kt 和 Application.kt 添加到我的项目中，但我的项目上没有安装 kotlin，所以我下载了 kotlin 插件，然后重新启动了我的 IDE，然后添加.kt 文件，但是当我尝试将 application.kt 添加到我的 android 清单时，应用程序将无法构建并显示“应用程序”已停止，但没有它它可以正常工作，我做错了什么？

这是我的application.kt代码

package com.example.tamataapp

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;

class Application : FlutterApplication(), PluginRegistrantCallback {

    override fun onCreate() {
        super.onCreate()
        FlutterFirebaseMessagingService.setPluginRegistrant(this)
    }

    override fun registerWith(registry: PluginRegistry) {
        GeneratedPluginRegistrant.registerWith(registry)
    }
}

和我的 MainActivity.kt

package com.example.tamataapp

import android.os.Bundle
import io.flutter.app.FlutterActivity
import io.flutter.plugins.GeneratedPluginRegistrant

class MainActivity: FlutterActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        GeneratedPluginRegistrant.registerWith(this)
        // getWindow().addFlags(LayoutParams.FLAG_SECURE)
    }
}

这是我的 Android 清单

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.tamataapp">
    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
         calls FlutterMain.startInitialization(this); in its onCreate method.
         In most cases you can leave this as-is, but you if you want to provide
         additional functionality it is fine to subclass or reimplement
         FlutterApplication and put your custom class here. "io.flutter.app.FlutterApplication" -->
    <application
        android:name=".Application"
        android:label="tamataapp"
        android:icon="@mipmap/ic_launcher">
        <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">
            <meta-data
                android:name="com.google.firebase.messaging.default_notification_channel_id"
                android:value="default_notification_channel_id”>Channel ID"/>
            <!-- 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="@drawable/launch_background"
                />
            <intent-filter>
            <action android:name="android.intent.action.MAIN"/>
            <category android:name="android.intent.category.LAUNCHER"/>
            <action android:name="com.google.firebase.MESSAGING_EVENT" />
            <action android:name="FLUTTER_NOTIFICATION_CLICK" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
        </activity>
        <!-- Don't delete the meta-data below.
             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
        <service
            android:name=".java.MyFirebaseMessagingService"
            android:exported="false">
        </service>
    </application>
</manifest>

Answer 1

Flutter 项目可能尚未配置为支持 Android 版 Kotlin。您可以按照此指南升级您的Flutter项目。

另一种选择是通过运行

flutter upgrade

以及您在 IDE 中使用的 Flutter 插件来升级您正在使用的 Flutter SDK。之后创建一个新的 Flutter 项目，Android 版本默认应该是 Kotlin。