Android /sdcard/emulated/0 和 /sdcard 之间的区别
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differences between /sdcard/emulated/0 and /sdcard
提问by giozh
I'm goig to be mad with a strange issue. If i create a folder inside my code as
我要为一个奇怪的问题生气了。如果我在我的代码中创建一个文件夹作为
directory_path = Environment.getExternalStorageDirectory()
+ "/" + context.getResources().getString(R.string.app_name);
directory = new File(directory_path);
if (!directory.exists()) {
directory.mkdirs();
}
a new folder is created inside /sdcard/ . If i try to print on logcat directory_path variable, the path is different: /storage/emulated/0/ and if i go to that path, i found another folder with the same name of the one created on /sdcard/ . This is a problem for me because when i try to write some data into that folder, everithing goes in the one on /storage/emulated/0 , and the other one (that is the folder i want use) remain empty. Why?
在 /sdcard/ 中创建一个新文件夹。如果我尝试在 logcat directory_path 变量上打印，路径是不同的： /storage/emulated/0/ 并且如果我转到该路径，我会找到另一个与 /sdcard/ 上创建的文件夹同名的文件夹。这对我来说是一个问题，因为当我尝试将一些数据写入该文件夹时，所有内容都在 /storage/emulated/0 上的一个中，而另一个（即我想要使用的文件夹）保持为空。为什么？
回答by Kai
Have you tried reading back the data? /storage/emulated/0/ is the new path introduced in JB to support multiple users on tablet. But as long as you access external files using Environment.getExternalStorageDirectory()it doesn't really matter where they really reside.
你试过读回数据吗？/storage/emulated/0/ 是 JB 中引入的新路径，用于支持平板电脑上的多个用户。但是只要您使用Environment.getExternalStorageDirectory()它访问外部文件，它们真正驻留在何处并不重要。
Here's some additional info: https://android.stackexchange.com/questions/35541/why-did-sdcard-turn-into-sdcard-0-with-4-2
这里有一些额外的信息：https: //android.stackexchange.com/questions/35541/why-did-sdcard-turn-into-sdcard-0-with-4-2
回答by duggu
/storage/emulated/0/: to my knowledge, this refers to the "emulated MMC" ("owner part"). Usually this is the internal one. The "0" stands for the user here, "0" is the first user aka device-owner. If you create additional users, this number will increment for each.
/storage/emulated/legacy/ as before, but pointing to the part of the currently working user (for the owner, this would be a symlink to
/storage/emulated/0/). So this path should bring every user to his "part".
/sdcard/: According to a comment by Shywim, this is a symlink to...
/mnt/sdcard (Android < 4.0)
/storage/sdcard0 (Android 4.0+)
/storage/emulated/0/：据我所知，这是指“模拟 MMC”（“所有者部分”）。通常这是内部的。这里的“0”代表用户，“0”是第一个用户，也就是设备所有者。如果您创建更多用户，则每个用户的数量都会增加。
/storage/emulated/legacy/ 和以前一样，但指向当前工作用户的部分（对于所有者，这将是指向
/存储/模拟/0/）。所以这条路应该把每个用户带到他的“部分”。
/sdcard/：根据 Shywim 的评论，这是一个符号链接...
/mnt/sdcard (Android < 4.0)
/storage/sdcard0 (Android 4.0+)
For more detail you can visit stackexchange
有关更多详细信息，您可以访问stackexchange
