Step 1: add the below line inside file -> android/local.properties
flutter.minSdkVersion=21
flutter.targetSdkVersion=30
flutter.compileSdkVersion=30
Step 2: Replace the below code inside file -> android/app/build.gradle
android {
....
compileSdkVersion localProperties.getProperty('flutter.compileSdkVersion').toInteger()
....
defaultConfig {
minSdkVersion localProperties.getProperty('flutter.minSdkVersion').toInteger()
targetSdkVersion localProperties.getProperty('flutter.targetSdkVersion').toInteger()
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName
}
}