Android如何通過Java sdk的方式接入OpenCv

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

override fun onCreate() {
    super.onCreate()

    OpenCVLoader.initDebug()

    val loadSuccess: Boolean = OpenCVLoader.initDebug()

    if (!loadSuccess) {
      Log.e("-->", "Opencv load Fail")
    } else {
      Log.e("-->", "Opencv load Success")
    }
}

if(ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED){
   ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.CAMERA), 1);
}else{
   startActivity(Intent(this,OpenCvActivity::class.java))
}

class OpenCvActivity : AppCompatActivity(), CvCameraViewListener2 {

  private lateinit var mRotateFrame: Mat
  private lateinit var mRgbFrame: Mat

  public override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
    setContentView(R.layout.activity_opencv)

    jcv_surface_view.setCvCameraViewListener(this)
    // 開啟前置攝像頭
    jcv_surface_view.setCameraIndex(CameraBridgeViewBase.CAMERA_ID_FRONT)
  }

  public override fun onPause() {
    super.onPause()
    if (jcv_surface_view != null) {
      jcv_surface_view!!.disableView()
    }
  }

  public override fun onResume() {
    super.onResume()
    if (!OpenCVLoader.initDebug()) {
      OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION, this, mLoaderCallback)
    } else {
      mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS)
    }
  }

  public override fun onDestroy() {
    super.onDestroy()
    if (jcv_surface_view != null) {
      jcv_surface_view!!.disableView()
    }
  }

  override fun onCameraViewStarted(width: Int, height: Int) {
    mRotateFrame = Mat()
    mRgbFrame = Mat()
  }

  override fun onCameraViewStopped() {}
  override fun onCameraFrame(inputFrame: CvCameraViewFrame): Mat {
    mRgbFrame = inputFrame.rgba()
    // 旋轉(zhuǎn)屏幕
    Core.flip(mRgbFrame, mRotateFrame, 1)
    return mRotateFrame
  }

  private val mLoaderCallback: BaseLoaderCallback = object : BaseLoaderCallback(this) {
    override fun onManagerConnected(status: Int) {
      when (status) {
        LoaderCallbackInterface.SUCCESS -> {
          jcv_surface_view!!.enableView()
        }
        else -> {
          super.onManagerConnected(status)
        }
      }
    }
  }
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <org.opencv.android.JavaCameraView
    android:id="@+id/jcv_surface_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

</RelativeLayout>