When using an external SD Card in Android 15, there will be problems listing files in the directory

[yiharng]

Bug Report

Problem

The following code will cause an error in Android 15 when using an external SD Card

window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function()
{
  window.resolveLocalFileSystemURL("file:///storage/0000-0000/Android/data/xxx.xxx.xxx.xxx/files",function(d)
  {
    d.createReader().readEntries(function(ok)
    {
       console.log("ok");
    },function(err)
    {
       console.log("err");
    });
  },errfunc);
},errfunc);

I modified FileUtils.java in the source code as shown below. After adding annotations, the program can run normally. However, this modification method is not ideal.

        } else if (action.equals("readEntries")) {
            threadhelper(new FileOp() {
                public void run(JSONArray args) throws FileNotFoundException, JSONException, MalformedURLException, IOException {
                    String directory = args.getString(0);
                    String nativeURL = resolveLocalFileSystemURI(directory).getString("nativeURL");
/*                    
                    if (needPermission(nativeURL, READ)) {
                        getReadPermission(rawArgs, ACTION_READ_ENTRIES, callbackContext);
                    } else {
*/                    
                        JSONArray entries = readEntries(directory);
                        callbackContext.success(entries);
//                    }
                }
            }, rawArgs, callbackContext);

[breautek]

It's likely an issue with the needPermission method.

Note that since scoped storage, most paths in the external file system is not readable. The only path that should be readable via FS apis is cordova.file.externalApplicationStorageDirectory, which it sounds like is what you have, but our docs states the path starts with /sdcard while your example shows /storage.

Are you able to confirm whether the externalApplicationStorageDirectory constant matches file:///storage/0000-0000/Android/data/xxx.xxx.xxx.xxx/files

If they don't match that's likely the root cause of the issue.

[yiharng]

I have another SD Card for expansion inserted into my Android phone, and then I use cordova.plugins.diagnostic.getExternalSdCardDetails to get the path of this SD Card, so it is different from the externalApplicationStorageDirectory path. I found that I can write and read data in the expanded SD Card without any problems. Only when getting the file name in the directory will an error occur.

[breautek]

Yah so the file plugin assumes one path, and assumes you're using the constant, and it does a check based on that to determine if attempting read permission is necessary.

But there are multiple ways on the filesystem to get access to the sdcard. /sdcard is just a symlink to /storage/... i believe.

So I think the best course of action is to make sure that both /sdcard/ and /storage/ paths are used in the checks.