我已将SDK版本更新为31，之后我收到此错误。这是我的Gradle：

android {
    compileSdkVersion 31

    defaultConfig {
        applicationId "com.persiandesigners.alldentshops"
        minSdkVersion 16
        targetSdkVersion 31
        vectorDrawables.useSupportLibrary = true
        versionCode 1
        versionName "1"
    }

    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
    lintOptions {
        checkReleaseBuilds false
        abortOnError false
    }
}

dependencies {
    implementation 'androidx.appcompat:appcompat:1.4.0'
    implementation 'androidx.recyclerview:recyclerview:1.2.0-alpha01'
    implementation 'androidx.cardview:cardview:1.0.0-alpha01'
    implementation 'com.google.android.material:material:1.2.0-alpha01'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta4'

我得到这个错误：清单合并失败：需要为显式指定android：exported。如果对应组件定义了Intent过滤器，则面向Android 12及更高版本的应用需要为android:exported指定显式值。有关详细信息，请参阅www.example.com。https://developer.android.com/guide/topics/manifest/activity-element#exported for details.
我照它说的做了，这是我的清单代码：

<activity
        android:name="mypackage.MainActivity"
        android:exported="true"
        tools:node="merge"
        android:label="@string/app_name"
        android:screenOrientation="portrait"
        android:theme="@style/SplashScreenTheme"
        android:windowSoftInputMode="stateAlwaysHidden">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

这是启动器活动，我已经添加了android：exported标记，我尝试了清理和重建，但它不工作。我仍然在清单合并中得到合并错误：

Merging Errors: Error: android:exported needs to be explicitly specified for <activity>. Apps targeting Android 12 and higher are required to specify an explicit value for `android:exported` when the corresponding component has an intent filter defined. See https://developer.android.com/guide/topics/manifest/activity-element#exported for details. forushgah_alldentalshop.app main manifest (this file)

它指向主活动