File.listFiles returns null when it shouldn't

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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.


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

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

File.listFiles returns null when it shouldn't, If you are targeting Android SDK >=23 you need to take permission at run-time. File.list and File.listFiles return NULL. Ask Question Asked 6 years, 2 months ago. Viewed 5k times 3. 1. in my app, the user can download different sound files.


It returns null as Environment.getExternalStoragePublicDirectory will/is supposed to handle files from external storage like SD card..as you are stating no sd card is inserted

JDK-4803836 File.listFiles() returns null for 'System Volume , File.isDirectory() returns true for this directory, but File.listFiles() returns null, contrary to the documentation. This requires an extra null check which should not be  From the File ‘listFiles’ method documentation: Returns null if this abstract pathname does not denote a directory, or if an I/O error occurs. So perhaps an I/O error occurred. Check the permissions on that directory, does the user running the java program have the permission to read that directory? If not, there is your answer.


As Abhishek Aryan suggested, I am using Android SDK >=23 so I had to obtain permissions using code:

  boolean grantedAll = ContextCompat.checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED;
if (!grantedAll)
   {
     ActivityCompat.requestPermissions(thisActivity,
            new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
            REQUEST_PERMISSIONS);
   }

[JDK-6372792] File.listFiles() returns null under Windows, but not , listFiles() should never return null. ACTUAL - On Linux, if someDirectory.​canRead() returns true, then someDirectory.listFiles() always returns non  Android File.listFiles() returns null. Ask Question Asked 1 year, 4 months ago. Active 1 year, 3 months ago. Viewed 1k times 1. I am trying to access my android files


[JDK-8179883] listFiles() method execution always returns NULL , File root = new File(path); File[] list = root.listFiles(); if (list == null) return result; for (File f : list) { if (f.isDirectory()) { checkFile(f.getAbsolutePath()  I have looking java docs and I have realized that File.listFiles() will return a null if the arbitrary path is not found. But in this case the path does exists and as I mentioned it did work two days ago. The for loop (has comment besides it) is the one that returns NPE. Any hints or even any alternate methonds are appreciated.


File exists and IS directory, but listFiles() returns null, For some reason, listFiles( ) is returning null even though the File is BTW you should not use +”” to convert something to a string, it's a bad  The println statement in this block is printing, as it should, the direct path to the folder and then the memory address along with some other information. However, somewhere in the folder it is printing out null when listFiles() is called. The folder that it is doing this on is not empty.


File, Creates a new empty file in the specified directory, using the given Returns the canonical pathname string of this abstract pathname. Note: this method should not be used for file-locking, as the resulting that of the listFiles() method, except that the pathnames in the returned array must satisfy the filter. File.listFiles (); Returns: An array of abstract pathnames denoting the files and directories in the directory denoted by this abstract pathname. The array will be empty if the directory is empty. Returns null if this abstract pathname does not denote a directory, or if an I/O error occurs.