Android 获取权限

以拨打电话为例
1、在清单文件中添加需要的权限

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

2、判断是否拥有权限

//判断是否拥有该权限
if(ContextCompat.checkSelfPermission(this,android.Manifest.permission.CALL_PHONE)!= PackageManager.PERMISSION_GRANTED){
  //无权限 申请权限
   ActivityCompat.requestPermissions(this, arrayOf(android.Manifest.permission.CALL_PHONE),1)
 }else{
  //有权限执行逻辑
  }

申请权限后通过回调确认用户操作

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        //根据回调的识别码 判断用户是否授予相关权限
        when (requestCode){
            1->{
                if(grantResults.isNotEmpty()&&grantResults[0] == PackageManager.PERMISSION_GRANTED){
                    //授予权限 执行逻辑
                }else{
                    //未授予权限进行提示
                    Toast.makeText(this,"You denied the permission",Toast.LENGTH_SHORT).show()
                }
            }
        }
    }