12. Camera2 실습(1)
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작성자 관리자 댓글 0건 조회 2,985회 작성일 20-12-10 12:00본문
class QRScan6Activity : AppCompatActivity() {
private var textureView: TextureView? = null
private var cameraId: String? = null
protected var cameraDevice: CameraDevice? = null
protected var cameraCaptureSessions: CameraCaptureSession? = null
//protected CaptureRequest captureRequest;
protected var captureRequestBuilder: CaptureRequest.Builder? = null
private var imageDimension: Size? = null
private val REQUEST_CAMERA_PERMISSION = 200
private var backgroundHandler: Handler? = null
private var backgroundThread: HandlerThread? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_qrscan)
setTitle("QRCode Scanner")
textureView = findViewById(R.id.texture)
assert(textureView != null)
textureView!!.setSurfaceTextureListener(textureListener)
}
var textureListener: TextureView.SurfaceTextureListener = object : TextureView.SurfaceTextureListener {
override fun onSurfaceTextureAvailable(surface: SurfaceTexture, width: Int, height: Int) {
//open your camera here
openCamera()
}
override fun onSurfaceTextureSizeChanged(surface: SurfaceTexture,width: Int, height: Int) {
// Transform you image captured size according to the surface width and height
}
override fun onSurfaceTextureDestroyed(surface: SurfaceTexture): Boolean {
return false
}
override fun onSurfaceTextureUpdated(surface: SurfaceTexture) {}
}
private fun openCamera() {
val manager = getSystemService(CAMERA_SERVICE) as CameraManager
Log.i(TAG, "is camera open")
try {
cameraId = manager.cameraIdList[0]
val characteristics = manager.getCameraCharacteristics(cameraId!!)
val map = characteristics[CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP]!!
imageDimension = map.getOutputSizes(SurfaceTexture::class.java)[0]
// Add permission for camera and let user grant the permission
if (ActivityCompat.checkSelfPermission(this,
Manifest.permission.CAMERA) !== PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(this,
Manifest.permission.WRITE_EXTERNAL_STORAGE )
!== PackageManager.PERMISSION_GRANTED
) {
ActivityCompat.requestPermissions(
this@QRScan6Activity,
arrayOf<String>(
Manifest.permission.CAMERA,
Manifest.permission.WRITE_EXTERNAL_STORAGE
),
REQUEST_CAMERA_PERMISSION
)
return
}
manager.openCamera(cameraId!!, stateCallback, null)
} catch (e: CameraAccessException) {
e.printStackTrace()
}
Log.i(TAG, "openCamera X")
}
private val stateCallback: CameraDevice.StateCallback = object : CameraDevice.StateCallback() {
override fun onOpened(camera: CameraDevice) {
//This is called when the camera is open
Log.i(TAG, "onOpened")
cameraDevice = camera
createCameraPreview()
}
override fun onDisconnected(camera: CameraDevice) {
cameraDevice!!.close()
}
override fun onError(camera: CameraDevice, error: Int) {
cameraDevice!!.close()
cameraDevice = null
}
}
protected fun createCameraPreview() {
try {
val texture = textureView!!.surfaceTexture!!
texture.setDefaultBufferSize(imageDimension!!.width, imageDimension!!.height)
val surface = Surface(texture)
captureRequestBuilder =
cameraDevice!!.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)
captureRequestBuilder!!.addTarget(surface)
cameraDevice!!.createCaptureSession(
Arrays.asList(surface),
object : CameraCaptureSession.StateCallback() {
override fun onConfigured(@NonNull cameraCaptureSession: CameraCaptureSession) {
//The camera is already closed
if (null == cameraDevice) {
return
}
// When the session is ready, we start displaying the preview.
cameraCaptureSessions = cameraCaptureSession
updatePreview()
}
override fun onConfigureFailed(@NonNull cameraCaptureSession: CameraCaptureSession) {
Toast.makeText(this@QRScan6Activity,"Configuration change",
Toast.LENGTH_SHORT ).show()
}
},
null
)
} catch (e: CameraAccessException) {
e.printStackTrace()
}
}
protected fun updatePreview() {
if (null == cameraDevice) {
Log.e(TAG, "updatePreview error, return")
}
captureRequestBuilder!!.set(
CaptureRequest.CONTROL_MODE,
CameraMetadata.CONTROL_MODE_AUTO
)
try {
cameraCaptureSessions!!.setRepeatingRequest(
captureRequestBuilder!!.build(),
null,
backgroundHandler
)
} catch (e: CameraAccessException) {
e.printStackTrace()
}
}
private fun closeCamera() {
if (null != cameraDevice) {
cameraDevice!!.close();
cameraDevice = null;
}
}
override fun onRequestPermissionsResult(
requestCode: Int,
permissions: Array<String?>,
grantResults: IntArray
) {
if (requestCode == REQUEST_CAMERA_PERMISSION) {
if (grantResults[0] == PackageManager.PERMISSION_DENIED) {
// close the app
Toast.makeText(this,"사진촬영 권한이 승인되지 않으면 이앱을 사용할 수 없습니다.",
Toast.LENGTH_LONG
).show()
finish()
}
}
}
override fun onResume() {
super.onResume()
Log.i(TAG, "onResume")
startBackgroundThread()
if (textureView!!.isAvailable) {
openCamera()
} else {
textureView!!.surfaceTextureListener = textureListener
}
}
override fun onPause() {
Log.i(TAG, "onPause")
//captureRequestBuilder!!.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_OFF)
closeCamera()
stopBackgroundThread()
super.onPause()
}
protected fun startBackgroundThread() {
backgroundThread = HandlerThread("Camera Background")
backgroundThread!!.start()
backgroundHandler = Handler(backgroundThread!!.getLooper())
}
protected fun stopBackgroundThread() {
backgroundThread!!.quitSafely()
try {
backgroundThread!!.join()
backgroundThread = null
backgroundHandler = null
} catch (e: InterruptedException) {
e.printStackTrace()
}
}
}
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