由于主要在acitivity_main.xml和MainActivity.kt, 这里一般只展示这两个
然后其他资源请自行到 第一行代码——Android(第3版)图灵社区下载

8.2 运行时权限

这个案例的代码要求android 6.0 以上

点击允许后, 会呼叫10086. 在您允许一次后，之后再请求就不会询问了，因为您已经授权了，然后想取消他的权限要在setting -> APPs&notifications -> <项目名称> -> Permissions.

AndroidManifest.xml
添加这一行

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.example.contentprovider_1">

    <uses-permission android:name="android.permission.CALL_PHONE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        tools:ignore="GoogleAppIndexingWarning">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/makeCall"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Call"
        tools:ignore="HardcodedText,MissingConstraints" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

package com.example.contentprovider_1

import android.content.Intent
import android.content.pm.PackageManager
import android.net.Uri
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import kotlinx.android.synthetic.main.activity_main.*
import java.util.jar.Manifest

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        makeCall.setOnClickListener{
            if(ContextCompat.checkSelfPermission(
                    this,
                    android.Manifest.permission.CALL_PHONE
                ) != PackageManager.PERMISSION_GRANTED){
                ActivityCompat.requestPermissions(
                    this,
                    arrayOf(android.Manifest.permission.CALL_PHONE),
                    1
                )    //最后一个参数是请求码，只需唯一即可
            } else {
                call()
            }
        }
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        when(requestCode) {
            1 -> {
                if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED){
                    call()
                } else {
                    Toast.makeText(this, "You denied the permission", Toast.LENGTH_SHORT).show()
                }
            }
        }
    }

    private fun call(){
        try{
            val intent = Intent(Intent.ACTION_CALL)
            intent.data = Uri.parse("tel:10086")
            startActivity(intent)
        } catch (e: SecurityException) {
            e.printStackTrace()
        }
    }
}