API 26+:始终拒绝WRITE_EXTERNAL_STORAGE权限 [英] API 26+: WRITE_EXTERNAL_STORAGE permission is always denied

问题描述

我已将我的应用切换为目标API 27，但现在无法授予它WRITE_EXTERNAL_STORAGE权限-grantResult始终为-1.

I have switched my app to target API 27 and now it can't be granted WRITE_EXTERNAL_STORAGE permission -- grantResult is always -1.

我的应用需要此权限，因为它不使用应用的私有外部存储空间(

My app needs this permission since it doesn't use apps private external storage space (which doesn't require WRITE_EXTERNAL_STORAGE starting from API 19).

我知道API 26中存在行为更改权限.但这不能解释我的问题.

I know that in API 26 there have been behavior changes for permissions. However this doesn't explain my problem.

我正在以标准方式同时请求READ_EXTERNAL_STORAGE和WRITE_EXTERNAL_STORAGE权限:

I'm requesting both READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE permissions in a standard way:

ActivityCompat.requestPermissions(activity, new String[] {
        Manifest.permission.READ_EXTERNAL_STORAGE,
        Manifest.permission.WRITE_EXTERNAL_STORAGE
    }, requestCode);

(两个权限都通过清单中的<uses-permission声明).

(both permissions are declared via <uses-permission in manifest).

出现对话框，然后单击允许":

The dialog appears and I click "Allow":

但是在onRequestPermissionsResult回调中，我得到了-1(被拒绝)用于WRITE_EXTERNAL_STORAGE(和0(被授予)用于READ_EXTERNAL_STORAGE).

However inside onRequestPermissionsResult callback I'm getting a -1(denied) for WRITE_EXTERNAL_STORAGE (and 0 (granted) for READ_EXTERNAL_STORAGE).

既然我已经请求并可能同时授予了这两个结果，那么对两个结果都不会是0吗?

Shouldn't the result be 0 for both since I have requested and, presumably, granted both?

我尝试单独请求WRITE_EXTERNAL_STORAGE，但是在这种情况下，对话框根本不会出现.

I have tried to request WRITE_EXTERNAL_STORAGE alone, but in this case the dialog doesn't appear at all.

更多细节:我刚刚检查了build/intermediates/manifests/full/debug中的合并清单，并注意到WRITE_EXTERNAL_STORAGE权限具有属性android:maxSdkVersion="18"(清单中没有此类属性).这可能是因为我的应用程序具有minApiVersion=21，但我不确定.

One more detail: I have just checked the merged manifest in build/intermediates/manifests/full/debug and noticed that WRITE_EXTERNAL_STORAGE permission has attribute android:maxSdkVersion="18" (there is no such attribute in my manifest). This could be happening because my app has minApiVersion=21, but I'm not sure.

推荐答案

在某个地方，您正在选择android:maxSdkVersion="18"属性.我的猜测是它来自图书馆.在编辑自己的清单时，请检查Android Studio中的合并清单"标签.它将详细说明各种元素和属性所起的作用.

Somewhere along the line, you are picking up that android:maxSdkVersion="18" attribute. My guess is that it is coming from a library. Check the "Merged Manifest" tab in Android Studio, when you are editing your own manifest. It will have details of what is contributing the various elements and attributes.

android:maxSdkVersion的作用是至少在运行时权限的工作方式上，删除了更高版本的Android SDK上的<uses-permission>元素.

android:maxSdkVersion has the effect of removing your <uses-permission> element on higher Android SDK versions, at least in terms of how runtime permissions work.

由于您需要所有版本的此权限，因此在<uses-permission>元素上添加tools:remove="android:maxSdkVersion"应该会还原android:maxSdkVersion="18"并提供您期望的结果.

Since you need this permission for all versions, adding tools:remove="android:maxSdkVersion" on the <uses-permission> element should revert the android:maxSdkVersion="18" and give you what you expect.

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