Flutter 项目：错误

Question

所有更新信息都在这里：Flutter Project : Errors (mostly with Android Manifest and Main Activity files)

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="polacoenchile.world_time_app2">
   <application
        android:label="world_time_app2"
        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">
            <!-- 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"/>
            </intent-filter>
        </activity>

        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </application>
</manifest>

这就是我的文件的样子，我从来没有碰过任何东西，所以我不知道出了什么问题。在图片上我显示所有错误。我进行分析是因为在模拟器上一切正常。我制作了 .apk 文件以安装在我的手机上，我成功了，但 applicacion 没有显示任何内容，只是灰色背景。 有谁知道怎么回事？

my app project errors

android project

android project errors

mainactivity file

MainActivity 文件

package polacoenchile.world_time_app2

import io.flutter.embedding.android.FlutterActivity

class MainActivity: FlutterActivity() {
}

FLutter 医生在将 Flutter 降级到稳定版本后发现了一些问题。但我确信我会在我的 android studio 中添加插件：Flutter、Dart

C:\Users\wdowk>flutter doctor -v
[√] Flutter (Channel stable, 1.22.6, on Microsoft Windows [Version 10.0.18363.1379], locale pl-PL)
    • Flutter version 1.22.6 at C:\src\flutter
    • Framework revision 9b2d32b605 (5 weeks ago), 2021-01-22 14:36:39 -0800
    • Engine revision 2f0af37152
    • Dart version 2.10.5

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at C:\Users\wdowk\AppData\Local\Android\Sdk
    • Platform android-30, build-tools 30.0.3
    • Java binary at: F:\Program Files\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
    • All Android licenses accepted.

[!] Android Studio (version 4.1.0)
    • Android Studio at F:\Program Files\Android Studio
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[!] Connected device
    ! No devices available

! Doctor found issues in 2 categories.

Answer 1

你评论了你不应该评论的部分，如果你修复这条线，一切都会正常

   <!-- 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" />