Flutter 项目：错误

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如何解决Flutter 项目：错误？

此处的所有更新信息：Flutter Project : Errors (mostly with Android Manifest and Main Activity files)

<manifest xmlns:androID="http://scheR_723_11845@as.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，我从不碰任何东西，所以我不知道出了什么问题。在图片上，我显示了所有错误。我进行分析，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，我制作了它但应用程序没有显示任何内容，只是灰色背景。 有谁知道怎么回事？

android project

android project errors

主活动文件

package polacoenchile.world_time_app2

import io.Flutter.embedding.androID.FlutterActivity

class MainActivity: FlutterActivity() {
}

Flutter 医生在将 Flutter 降级到稳定版后发现了一些问题。但我确定我在我的 androID studio 中添加了插件：Flutter,Dart

C:\Users\wdowk>Flutter doctor -v
[√] Flutter (ChAnnel s@R_403_5991@,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.

解决方法

   <!-- 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" />

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