现代android 动态权限，两种不同写法

 val permissions = arrayOf(
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE,
            Manifest.permission.CAMERA,
            Manifest.permission.ACCESS_NOTIFICATION_POLICY
        )


        if (!hasQx(permissions)) {
            ActivityCompat.requestPermissions(this, permissions, 400)
        }
 override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (requestCode == 300) {
            if (grantResults.size == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                println("申请成功")
            } else {
                //申请失败
                println("申请失败")
            }
        } else if (requestCode == 400) {
            for (i: Int in permissions.indices) {
                if (ActivityCompat.checkSelfPermission(
                        this,
                        permissions[i]
                    ) == PackageManager.PERMISSION_GRANTED
                ) {
                    println("${permissions[i]}已经授权")
                } else {
                    println("${permissions[i]}没有授权")
                }
            }
        }

    }

if (ActivityCompat.checkSelfPermission(
                this,
                Manifest.permission.READ_EXTERNAL_STORAGE
            ) != PackageManager.PERMISSION_GRANTED
        ) {
            requestPermission.launch(Manifest.permission.READ_EXTERNAL_STORAGE)
        }
    }
       private var requestPermission = registerForActivityResult(
        ActivityResultContracts.RequestPermission()
    ) { isGranted ->
        run {
            if (isGranted) {
                println("权限授予")
            } else {
                println("权限bu授予")
            }

        }
    }

详细案例：

package com.linghang.hf

import android.Manifest
import android.content.pm.PackageManager
import android.os.Bundle
import android.view.View
import android.view.View.OnClickListener
import androidx.activity.result.contract.ActivityResultContracts
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import com.linghang.hf.databinding.ActivityTestBinding


class TestDemo : AppCompatActivity(), OnClickListener {
    private lateinit var inflate: ActivityTestBinding

    private var requestPermission = registerForActivityResult(
        ActivityResultContracts.RequestPermission()
    ) { isGranted ->
        run {
            if (isGranted) {
                println("权限授予")
            } else {
                println("权限bu授予")
            }

        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        inflate = ActivityTestBinding.inflate(layoutInflater)

        setContentView(inflate.root)

        inflate.btnOpen1.setOnClickListener(this)
        inflate.btnOpen2.setOnClickListener(this)
        inflate.btnOpen3.setOnClickListener(this)
    }

    override fun onClick(v: View?) {
        val btnOpen1 = inflate.btnOpen1

        val btn2 = inflate.btnOpen2

        val btn3 = inflate.btnOpen3


        when (v) {
            btnOpen1 -> {
                checkRead()
            }

            btn2 -> {


                println("vvv")
                checkMore()

            }

            btn3 -> {
                check2()
            }

        }
    }

    private fun check2() {
        if (ActivityCompat.checkSelfPermission(
                this,
                Manifest.permission.READ_EXTERNAL_STORAGE
            ) != PackageManager.PERMISSION_GRANTED
        ) {
            requestPermission.launch(Manifest.permission.READ_EXTERNAL_STORAGE)
        }
    }


    private fun checkMore() {
        val permissions = arrayOf(
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE,
            Manifest.permission.CAMERA,
            Manifest.permission.ACCESS_NOTIFICATION_POLICY
        )


        if (!hasQx(permissions)) {
            ActivityCompat.requestPermissions(this, permissions, 400)
        }

    }

    private fun hasQx(permissions: Array<String>): Boolean {

        for (p: String in permissions) {
            if (ActivityCompat.checkSelfPermission(this, p) != PackageManager.PERMISSION_GRANTED) {
                return false
            }
        }
        return true
    }

    private fun checkRead() {
        if (ActivityCompat.checkSelfPermission(
                this@TestDemo,
                Manifest.permission.READ_EXTERNAL_STORAGE
            ) == PackageManager.PERMISSION_GRANTED
        ) {
            //已经拥有权限
            println("已经拥有权限")
        } else {


            println(
                "fff" + ActivityCompat.shouldShowRequestPermissionRationale(
                    this,
                    Manifest.permission.READ_EXTERNAL_STORAGE
                )
            )


            if (ActivityCompat.shouldShowRequestPermissionRationale(
                    this,
                    Manifest.permission.READ_EXTERNAL_STORAGE
                )
            ) {

                //权限拒绝了还可以去申请
                ActivityCompat.requestPermissions(
                    this,
                    arrayOf(Manifest.permission.READ_EXTERNAL_STORAGE), 300
                )
            } else {
                //没有权限去申请
                ActivityCompat.requestPermissions(
                    this,
                    arrayOf(Manifest.permission.READ_EXTERNAL_STORAGE),
                    300
                )

            }
        }
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (requestCode == 300) {
            if (grantResults.size == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                println("申请成功")
            } else {
                //申请失败
                println("申请失败")
            }
        } else if (requestCode == 400) {
            for (i: Int in permissions.indices) {
                if (ActivityCompat.checkSelfPermission(
                        this,
                        permissions[i]
                    ) == PackageManager.PERMISSION_GRANTED
                ) {
                    println("${permissions[i]}已经授权")
                } else {
                    println("${permissions[i]}没有授权")
                }
            }
        }

    }
}