Initial Setup

Is required the minimum android SDK to 21 (Android 5.0 Lollipop) and Java compiled SDK Version to 33 (Android 13).

You can change the minSdkVersion to 21 and the compileSdkVersion and targetSdkVersion to 33, inside the file build.gradle, located inside "android/app/" folder.

// android/app/build.gradle
android {
    compileSdkVersion 33

    defaultConfig {
        minSdkVersion 21
        targetSdkVersion 33
        …
    }
    …
}

Also, to turn your app fully compatible with Android 13 (SDK 33), you need to add the attribute android:exported="true" to any <activity>, <activity-alias>, <service>, or <receiver> components that have <intent-filter> declared inside in the app’s AndroidManifest.xml file, and that's turns required for every other flutter packages that you're using.

<!-- android/app/src/main/AndroidManifest.xml -->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapp">
   <application>
        ...
        <activity
            android:name=".MainActivity"
            ...
            android:exported="true">
                ...
        </activity>
        ...
    </application>
</manifest>