모듈 종속성 추가

dependencies {
  implementation project(path: ':sdk')
  ...

카메라 권한 추가

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" android:required="false" />
    <uses-feature android:name="android.hardware.camera.autofocus" android:required="false" />

화면 레이아웃 작성

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <org.opencv.android.JavaCameraView
        android:id="@+id/camera_view"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:show_fps="true" />

</androidx.constraintlayout.widget.ConstraintLayout>

코드 작성

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        OpenCVLoader.initDebug()  // ← OpenCVライブラリ読込
        initCamera()
    }

    fun initCamera() {
        // リスナ設定 
        camera_view.setCvCameraViewListener(object : CameraBridgeViewBase.CvCameraViewListener2 {
            override fun onCameraViewStarted(width: Int, height: Int) { }

            override fun onCameraViewStopped() { }

            override fun onCameraFrame(inputFrame: CameraBridgeViewBase.CvCameraViewFrame?): Mat {
                // このメソッド内で画像処理. 今回はポジネガ反転.
                val mat = requireNotNull(inputFrame).rgba()
                Core.bitwise_not(mat, mat)
                return mat
            }
        })

        // プレビューを有効にする
        camera_view.setCameraPermissionGranted()
        camera_view.enableView()
    }

실행 결과