How can I get the external SD card path for Android 4.0+?

Question

Samsung Galaxy S3 has an external SD card slot, which is mounted to /mnt/extSdCard.

How can I get this path by something like Environment.getExternalStorageDirectory()?

This will return mnt/sdcard, and I can't find the API for the external SD card. (Or removable USB storage on some tablets.)

Answer 1

I have a variation on a solution I found here

public static HashSet<String> getExternalMounts() {     final HashSet<String> out = new HashSet<String>();     String reg = "(?i).*vold.*(vfat|ntfs|exfat|fat32|ext3|ext4).*rw.*";     String s = "";     try {         final Process process = new ProcessBuilder().command("mount")                 .redirectErrorStream(true).start();         process.waitFor();         final InputStream is = process.getInputStream();         final byte[] buffer = new byte[1024];         while (is.read(buffer) != -1) {             s = s + new String(buffer);         }         is.close();     } catch (final Exception e) {         e.printStackTrace();     }      // parse output     final String[] lines = s.split("\n");     for (String line : lines) {         if (!line.toLowerCase(Locale.US).contains("asec")) {             if (line.matches(reg)) {                 String[] parts = line.split(" ");                 for (String part : parts) {                     if (part.startsWith("/"))                         if (!part.toLowerCase(Locale.US).contains("vold"))                             out.add(part);                 }             }         }     }     return out; } 

The original method was tested and worked with

• Huawei X3 (stock)
• Galaxy S2 (stock)
• Galaxy S3 (stock)

I'm not certain which android version these were on when they were tested.

I've tested my modified version with

• Moto Xoom 4.1.2 (stock)
• Galaxy Nexus (cyanogenmod 10) using an otg cable
• HTC Incredible (cyanogenmod 7.2) this returned both the internal and external. This device is kinda an oddball in that its internal largely goes unused as getExternalStorage() returns a path to the sdcard instead.

and some single storage devices that use an sdcard as their main storage

• HTC G1 (cyanogenmod 6.1)
• HTC G1 (stock)
• HTC Vision/G2 (stock)

Excepting the Incredible all these devices only returned their removable storage. There are probably some extra checks I should be doing, but this is at least a bit better than any solution I've found thus far.