File.listFiles不应该返回null [英] File.listFiles returns null when it shouldn't

问题描述

 <$ c $ 
我试图获取Phone Pictures文件夹（内部存储，没有插入SD卡）中存在的文件列表。 c> File file = Environment.getExternalStoragePublicDirectory（Environment.DIRECTORY_PICTURES）; 
 File [] files = file.listFiles（）; 
  

但文件值始终为空。
我也将此添加到AndroidManifest.xml中

$ p $ lt; code>< uses-permission android：name =android.permission。 READ_EXTERNAL_STORAGE/>

任何想法都将非常感谢，提前致谢。

= 23，则需要在运行时获得许可。

a href =https://developer.android.com/training/permissions/requesting.html =nofollow noreferrer> https://developer.android.com/training/permissions/requesting.html

I am trying to get list of files existing in the Phone Pictures folder (internal storage, no SDCard inserted) using this:

 File file = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
 File[] files = file.listFiles();

but files value is always being null. I also add this to AndroidManifest.xml

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

Any ideas will be much appreciated, thanks in advance.

解决方案

If you are targeting Android SDK >=23 you need to take permission at run-time.

https://developer.android.com/training/permissions/requesting.html

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