如何在kotlin中獲得許可結果

我正在嘗試在我的 android 上使用相機。將提示用戶獲得相機的許可。以前我為他們使用了 startActivityForResult 和 onRequestPermissionRequest。最近我發現它們已被棄用，所以我正在嘗試使用 registerForActivity。我設法更改為 startActivity 但我被困在權限請求中。我想知道我是否必須創建另一個權限啟動器，或者我可以在我的結果啟動器中執行權限。

    companion object{
        private const val CAMERA_PERMISSION_CODE = 1
        private const val CAMERA_REQUEST_CODE = 2 
    }
val checkpermission = Manifest.permission.CAMERA

        var resultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()){ result ->
                if (result.resultCode == Activity.RESULT_OK) {
                    val data: Intent? = result.data
                    val DP: Bitmap = data!!.extras!!.get("data") as Bitmap
                    val image = findViewById<ImageView>(R.id.imageButtonVerifyPhoto)
                    image.setImageBitmap(DP)
                }

            }

        val permissionLauncher = registerForActivityResult(ActivityResultContracts.RequestPermission()){
                isGranted ->
            if(isGranted){
                val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE) 
                resultLauncher.launch((intent))
                Toast.makeText(this,"Permission is tested", Toast.LENGTH_SHORT).show()
            }else{
                Toast.makeText(this,"Permission is denied",Toast.LENGTH_SHORT).show()
            }

        }
        var cameraButton = findViewById<Button>(R.id.buttonRetakePhoto) // can change later

        cameraButton.setOnClickListener {
            if(ContextCompat.checkSelfPermission(
                    this,
                    checkpermission
                ) == PackageManager.PERMISSION_GRANTED
            ){
                val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE) 
                resultLauncher.launch(intent)

            }else{
                permissionLauncher.launch(checkpermission)
            }
        }

    }

下面是我之前的 onRequestPermission 代碼

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if(requestCode == CAMERA_REQUEST_CODE){
            if(grantResults.isNotEmpty()&& grantResults[0] == PackageManager.PERMISSION_GRANTED){
                val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE) 
                startActivityForResult(intent, CAMERA_REQUEST_CODE)
            }else{
                Toast.makeText(this,"Permission is denied",Toast.LENGTH_SHORT).show()
            }
        }
    }

uj5u.com熱心網友回復：

2022 年最新解決方案：（不再有請求代碼）

1. 創建輔助擴展函式（用于Fragment）：

    fun Fragment.requestPermissions(request: ActivityResultLauncher<Array<String>>, permissions: Array<String>) = request.launch(permissions)
   
    fun Fragment.isAllPermissionsGranted(permissions: Array<String>) = permissions.all {
        ContextCompat.checkSelfPermission(requireContext(), it) == PackageManager.PERMISSION_GRANTED
    }
   

2. 請求權限Fragment：

    class FirstFragment : Fragment() {
        companion object {
            private val PERMISSIONS = arrayOf(Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_BACKGROUND_LOCATION)
        }
   
        private lateinit var binding: FragmentFirstBinding
        private lateinit var permissionsRequest: ActivityResultLauncher<Array<String>>
   
        override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
            binding = DataBindingUtil.inflate(inflater, R.layout.fragment_first, container, false)
            permissionsRequest = getPermissionsRequest()
   
            binding.grantButton.setOnClickListener {
                requestPermissions(permissionsRequest, PERMISSIONS)     //extension function
            }
   
            return binding.root
        }
   
        private fun getPermissionsRequest() = registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) {
            if (isAllPermissionsGranted(PERMISSIONS)) {             //extension function
                //do your stuff
            } else {
                //do your stuff
            }
        }
    }
   

uj5u.com熱心網友回復：

請求運行時權限只是稍微簡化了一點

private val requestPermission =
    registerForActivityResult(ActivityResultContracts.RequestPermission()) { isGranted ->
        // do something
    }

現在我們可以呼叫它來獲得你想要的任何型別的權限

cameraButton.setOnClickListener {
        
        if (ContextCompat.checkSelfPermission(
                this,
                Manifest.permission.CAMERA
            ) != PackageManager.PERMISSION_GRANTED
        ) {
            // Pass any permission you want while launching
            requestPermission.launch(Manifest.permission.CAMERA)
        }
    }

確保添加build.gradle

implementation 'androidx.fragment:fragment-ktx:1.2.0' // or later
implementation 'androidx.activity:activity-ktx:1.3.0' // or later

如果你想了解這一切是如何作業的，請查看這里

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