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Basically, API level means the Android version. This defines for which version you are targeting your application and what is going to be the minimum level of android version in your application will run. How to write packages and plugins for Flutter. Step 1: Create the package. To create a plugin package, use the --template=plugin flag with flutter create.. As of Flutter 1.20.0, Use the --platforms= option followed by a comma separated list to specify the platforms that the plugin supports.