Android动态权限申请 Kotlin实现

原文链接https://www.shanya.world/archives/3231ae8c.html

首先还是先去 AndroidManifest.xml文件中写上需要的权限，这里以存储权限为例。

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

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

之后在代码中进行动态申请，这里使用一个Button触发
MainActivity.kt

package com.shanya.permissionsdemo

import android.Manifest
import android.content.pm.PackageManager
import android.os.Build
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import androidx.core.content.ContextCompat
import kotlinx.android.synthetic.main.activity_main.*

const val REQUEST_WRITE_EXTERNAL_STORAGE = 1

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        button.setOnClickListener {
            if (ContextCompat.checkSelfPermission(this,
                            Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){
                requestPermissions(arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE),
                        REQUEST_WRITE_EXTERNAL_STORAGE)
            }else{
                Toast.makeText(this,"已申请权限",Toast.LENGTH_SHORT).show()
            }
        }
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        when(requestCode){
            REQUEST_WRITE_EXTERNAL_STORAGE -> {
                if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED){
                    Toast.makeText(this,"已申请权限",Toast.LENGTH_SHORT).show()
                }else{
                    Toast.makeText(this,"申请权限失败",Toast.LENGTH_SHORT).show()
                }
            }
        }
    }
}