The steps to build and use MediaPipe AAR is documented in MediaPipe's [android_archive_library.md](https://github.com/google/mediapipe/blob/master/mediapipe/docs/android_archive_library.md). The source code is copied from MediaPipe's [face detection gpu demo](https://github.com/google/mediapipe/tree/master/mediapipe/examples/android/src/java/com/google/mediapipe/apps/facedetectiongpu).qq