Question

if (ContextCompat.checkSelfPermission(thisActivity,
            Manifest.permission.READ_CONTACTS)
    != PackageManager.PERMISSION_GRANTED) {

// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(thisActivity,
        Manifest.permission.READ_CONTACTS)) {

    // Show an explanation to the user *asynchronously* -- don't block
    // this thread waiting for the user's response! After the user
    // sees the explanation, try again to request the permission.

} else {

    // No explanation needed, we can request the permission.

    ActivityCompat.requestPermissions(thisActivity,
            new String[]{Manifest.permission.READ_CONTACTS},
            MY_PERMISSIONS_REQUEST_READ_CONTACTS);

    // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
    // app-defined int constant. The callback method gets the
    // result of the request.
}

在这里，我正在检查是否使用“ContextCompat”授予了permisssion，并且我再次使用ActvityCompat请求权限... 我需要知道这两种方法有什么区别？

Answer 1

文档说：

要检查您是否拥有权限，请致电 ContextCompat.checkSelfPermission()方法。例如，这个片段显示如何检查活动是否具有写入权限日历：
int permissionCheck = ContextCompat.checkSelfPermission(thisActivity,
    Manifest.permission.WRITE_CALENDAR);

这意味着您要检查您的应用程序是否具有使用危险权限的权限。

activitycompat.requestPermission()用于请求用户授予我们使用危险权限的权限。

所以这是片段：

//checking if you have the permission
if (ContextCompat.checkSelfPermission(thisActivity,
                Manifest.permission.READ_CONTACTS)
        != PackageManager.PERMISSION_GRANTED) {
   // you don't have permission so here you will request the user for permission

  if (ActivityCompat.shouldShowRequestPermissionRationale(thisActivity,
        Manifest.permission.READ_CONTACTS)) {

        // Show an explanation to the user *asynchronously* -- don't block
        // this thread waiting for the user's response! After the user
        // sees the explanation, try again to request the permission.

    } else {

        // No explanation needed, we can request the permission.

        ActivityCompat.requestPermissions(thisActivity,
                new String[]{Manifest.permission.READ_CONTACTS},
                MY_PERMISSIONS_REQUEST_READ_CONTACTS);

        // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
        // app-defined int constant. The callback method gets the
        // result of the request.
    }

}

我希望这会以某种方式清除你的概念。

Answer 2

ContextCompat.checkSelfPermission（Context context，String permission）

此方法仅用于检查您是否已获得应用程序的可用权限。

ActivityCompat.requestPermissions（活动活动，String []权限，int reqCode）

此方法用于请求权限。

contextcompat.checkselfPermission（）和activitycompat.requestPermission（）之间有什么区别？

2 个答案: