→ 권한체크

• 체크할 권한(Camera) 를 담은 Array 를 함수에 대입

private val RC_PERMISSION = 0

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    binding = ActivityMainBinding.inflate(layoutInflater)
    setContentView(binding.root)
		
    binding.btnCamera.setOnClickListener{
        val arr = arrayOf(android.Manifest.permission.CAMERA)
        checkPermission(arr)
    }
}

// 권한검사 함수
private fun checkPermission(requirePermissionList : Array<String>){
    val neededPermissionList = ArrayList<String>()

		// 전달받은 권한목록중, 허가안된 권한 neededPermissionList에 담기
    for (permission in requirePermissionList){
        if(ContextCompat.checkSelfPermission(this,permission) != PackageManager.PERMISSION_GRANTED){
            neededPermissionList.add(permission)
        }
    }

		// neededPermissionList가 비어있지 않으면, 해당 권한들 허용모달 띄우기
    if(neededPermissionList.isNotEmpty()){
        val neededPermissionArr = neededPermissionList.toArray(arrayOf<String>())
        ActivityCompat.requestPermissions(this, neededPermissionArr, RC_PERMISSION)
    }else{
		
		// 비어있으면 Camera 열기
        openCamera()
    }
}

• 권한설정 후 결과값에 따라 분기처리

override fun onRequestPermissionsResult(
    requestCode: Int,
    permissions: Array<out String>,
    grantResults: IntArray
) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults)
    if(requestCode == RC_PERMISSION){

				//  권한설정 결과값에 따른 분기처리.
        if (ContextCompat.checkSelfPermission(this@MainActivity, Manifest.permission.CAMERA)
            != PackageManager.PERMISSION_GRANTED) {
            Log.d(TAG,"권한없음. 권한요청")
        } else {
            Log.d(TAG,"권한있음. opencamera")
            openCamera()
        }
    }
}

→ 카메라띄우기

• 카메라를 띄우는것은, MediaStore.ACTION_IMAGE_CAPTURE 인텐트를 실행하면 된다
• cameraLauncher은 아래서 설명

private fun openCamera() {
    val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
    cameraLauncher.launch(intent)
}