Android Studio-ActivityCompat.requestPermissions中“ this”的正确用法是什么？

Question

In using the method below, Android Studio is generating the following error on the keyword "this":

ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSIONS_REQUEST_READ_FINE_LOCATION);

Error:

Wrong first argument type...found com.websmithing.wp.gpstracker.LocationService, required android.app. Activity

I can reference the activity using "this" without any error when evaluating the manifest file permissions check as per below.

ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)   !=
  PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) !=
  PackageManager.PERMISSION_GRANTED) {

Can anyone point me in the right direction?

Answer 1

this refers to the present class. It only works with this when you are in an activity while requesting permission.

Solution

Send a notification from the service so when the user clicks it, open the activity and ask for the permissions you need.

How do I send a notification?

Simple refer to Building a Notification .

Answer 2

Pay attention to the error message. It's pointing you toward the solution.

Wrong first argument type...found com.websmithing.wp.gpstracker.LocationService, required android.app. Activity

It means that ActivityCompat.requestPermissions() is expecting an Activity as the first argument but you are providing a LocationService instance. I guess you are invoking this from an inner class, then perhaps you have to use WhateverYouActivityClassIs.this to refer to the outer class.

Answer 3

您必须在调用该类的活动中编写checkSelfpermission代码。