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Own custom native integrations
If there is platform-specific functionality that Flutter or its community Plugins are missing, you can build your own following the developing packages and plugins page. Flutter’s plugin architecture, in a nutshell, is much like using an Event bus in Android: you fire off a message and let the receiver process and emit a result back to you. In this case, the receiver is code running on the native side on Android or iOS.
Use the NDK
Your custom plugin first talks to your Android app, where you call your native functions over JNI. Once a response is ready, send a message back to Flutter and render the result. Calling native code directly from Flutter is currently not supported.