在项目或库中找不到清单中引用的类 io.flutter.app.FlutterApplication

Question

需要一些帮助我刚接触 Flutter，不知道我的 AndroidManifest.xml 文件有什么错误。在 android:name="io.flutter.app.FlutterApplication" ,android:name=".MainActivity ”。元数据中也有错误。我不知道文件是否损坏，我打开了其他 Android Flutter 项目，它在 AndroidManifest.xml 文件上出现了所有相同的错误，但 APP 运行时没有任何错误或任何错误。现在我添加的权限不起作用。

`

<uses-permission android:name="android.permission.ACCES_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCES_COARSE_LOCATION"/>

<!-- 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. -->
<application
    android:name="io.flutter.app.FlutterApplication"
    android:label="clima"
    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>
    <!-- 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" />
</application>

`

Answer 1

这很正常，因为 Flutter SDK 没有对 Android 代码进行代码检查。即使 Android 代码抛出了警告，如果 Android 代码没有“真正的”错误，您仍然应该能够运行 Flutter 应用。

您可以在此处为 Preferences > Language & Frameworks > Flutter > Experiments 启用 Java/Kotlin 的代码完成。即使代码正确，这也应该会删除 Android 项目上引发的警告。

...或点击Tools > Flutter > Open Android module in Android Studio。这应该会在 Android Studio 上打开 Flutter 项目的 Android 构建，并帮助检查给出的警告是否正确。