Flutter 项目：错误

Question

All updated information here: 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>

This is how look my file, I never touch there nothing so I have no idea what is wrong. On the picture i am showing all errors. I make analyze because on emulator all is working good. I made.apk file to install on my phone, i made it but applicacion is not showing nothng, just grey background. Anyone know what is wrong?

my app project errors

android project

android project errors

mainactivity file

MainActivity file

package polacoenchile.world_time_app2

import io.flutter.embedding.android.FlutterActivity

class MainActivity: FlutterActivity() {
}

FLutter doctor found few problems after downgrade flutter to stable version. But i am sure i add plugins to my android studio: 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

You Commented on the part where you shouldn't commented out, If you fix this line all will be working

   <!-- 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" />