我试图将照片保存在Android的一个子文件夹。这里有一点我code：

I'm trying to save pictures in a subfolder in Android. Here's a bit of my code:

File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
path = new File(path, "SubDirName");
path.mkdirs();

（我试过 getExternalStorageDirectory 而不是 getExternalStoragePublicDirectory 和图片文件夹，而不是DCIM）

(I've tried getExternalStorageDirectory instead of getExternalStoragePublicDirectory and the Pictures folder instead of DCIM.)

的事情是，所有子文件夹添加，包括它的内容，不要在Windows资源管理器显示时，该设备通过USB连接。它显示在Android文件管理器，但。

The thing is that any subfolder I add, including its contents, don't show up in Windows Explorer when the device is connected via USB. It does show in the Android File Manager, though.

我已经试过广播在新目录的父 ACTION_MEDIA_MOUNTED 意图。它没有工作。

I've tried broadcasting the ACTION_MEDIA_MOUNTED intent on the new directory's parent. It didn't work.

如果我在Windows中添加一个文件，它显示了在Android上。如果我通过文件管理器在Android上添加一个文件，它显示在Windows中。如果以编程方式添加的文件，它显示了在Android文件管理器，但不是在Windows资源管理器。我的需要的从Windows得到它，我不希望最终用户必须手动创建该文件夹。

If I add a file in Windows, it shows up on Android. If I add a file on Android via the File Manager, it shows up in Windows. If I add the file programmatically, it shows up on the Android File Manager but not in Windows Explorer. And I need to get it from Windows and I don't want the final user to have to create the folder manually.

我是什么做错了吗？

推荐答案

连题目好像是老了。我面临着同样的问题，并重新启动或者Android设备或PC不是为用户实际的解决方案。 :)这个问题是通过使用MTP协议（我讨厌这个协议）的。什么，你所要做的就是开始的可用文件的重新扫描，并且可以使用这样做的 MediaScannerConnection 类：

Even the topic seems to be old. I faced the same issue and rebooting either the Android device or the PC is not practical solution for users. :) This issue is through the use of the MTP protocol (I hate this protocol). What you have to do is to initiate a rescan of the available files and you can do this using the MediaScannerConnection class:

// snippet taken from question
File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
path = new File(path, "SubDirName");
path.mkdirs();

// initiate media scan and put the new things into the path array to
// make the scanner aware of the location and the files you want to see
MediaScannerConnection.scanFile(this, new String[] {path.toString()}, null, null);