你可以试试这个代码，我希望这方面的工作

import java.io.File;

import java.util.ArrayList;

import java.util.Scanner;

import android.os.Build;

import android.os.Environment;

import android.util.Log;

public class StorageOptions {

private static ArrayList mMounts = new ArrayList();

private static ArrayList mVold = new ArrayList();

public static String[] labels;

public static String[] paths;

public static int count = 0;

private static final String TAG = StorageOptions.class.getSimpleName();

public static void determineStorageOptions() {

readMountsFile();

readVoldFile();

compareMountsWithVold();

testAndCleanMountsList();

setProperties();

}

private static void readMountsFile() {

/*

* Scan the /proc/mounts file and look for lines like this:

* /dev/block/vold/179:1 /mnt/sdcard vfat

* rw,dirsync,nosuid,nodev,noexec,

* relatime,uid=1000,gid=1015,fmask=0602,dmask

* =0602,allow_utime=0020,codepage

* =cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0

*

* When one is found, split it into its elements and then pull out the

* path to the that mount point and add it to the arraylist

*/

// some mount files don't list the default

// path first, so we add it here to

// ensure that it is first in our list

mMounts.add("/mnt/sdcard");

try {

Scanner scanner = new Scanner(new File("/proc/mounts"));

while (scanner.hasNext()) {

String line = scanner.nextLine();

if (line.startsWith("/dev/block/vold/")) {

String[] lineElements = line.split(" ");

String element = lineElements[1];

// don't add the default mount path

// it's already in the list.

if (!element.equals("/mnt/sdcard"))

mMounts.add(element);

}

}

} catch (Exception e) {

// Auto-generated catch block

e.printStackTrace();

}

for(String p:mMounts)

{

Log.i("storage", p);

}

}

private static void readVoldFile() {

/*

* Scan the /system/etc/vold.fstab file and look for lines like this:

* dev_mount sdcard /mnt/sdcard 1

* /devices/platform/s3c-sdhci.0/mmc_host/mmc0

*

* When one is found, split it into its elements and then pull out the

* path to the that mount point and add it to the arraylist

*/

// some devices are missing the vold file entirely

// so we add a path here to make sure the list always

// includes the path to the first sdcard, whether real

// or emulated.

mVold.add("/mnt/sdcard");

try {

Scanner scanner = new Scanner(new File("/system/etc/vold.fstab"));

while (scanner.hasNext()) {

String line = scanner.nextLine();

if (line.startsWith("dev_mount")) {

String[] lineElements = line.split(" ");

String element = lineElements[2];

if (element.contains(":"))

element = element.substring(0, element.indexOf(":"));

// don't add the default vold path

// it's already in the list.

if (!element.equals("/mnt/sdcard"))

mVold.add(element);

}

}

} catch (Exception e) {

// Auto-generated catch block

e.printStackTrace();

}

}

private static void compareMountsWithVold() {

/*

* Sometimes the two lists of mount points will be different. We only

* want those mount points that are in both list.

*

* Compare the two lists together and remove items that are not in both

* lists.

*/

for (int i = 0; i < mMounts.size(); i++) {

String mount = mMounts.get(i);

if (!mVold.contains(mount))

mMounts.remove(i--);

}

// don't need this anymore, clear the vold list to reduce memory

// use and to prepare it for the next time it's needed.

mVold.clear();

}

private static void testAndCleanMountsList() {

/*

* Now that we have a cleaned list of mount paths Test each one to make

* sure it's a valid and available path. If it is not, remove it from

* the list.

*/

for (int i = 0; i < mMounts.size(); i++) {

String mount = mMounts.get(i);

File root = new File(mount);

if (!root.exists() || !root.isDirectory() || !root.canWrite())

mMounts.remove(i--);

}

}

@SuppressWarnings("unchecked")

private static void setProperties() {

/*

* At this point all the paths in the list should be valid. Build the

* public properties.

*/

Constants.mMounts = new ArrayList();

ArrayList mLabels = new ArrayList();

int j = 0;

if (mMounts.size() > 0) {

if (Build.VERSION.SDK_INT < Build.VERSION_CODES.GINGERBREAD)

mLabels.add("Auto");

else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {

if (Environment.isExternalStorageRemovable()) {

mLabels.add("External SD Card 1");

j = 1;

} else

mLabels.add("Internal Storage");

} else {

if (!Environment.isExternalStorageRemovable()

|| Environment.isExternalStorageEmulated())

mLabels.add("Internal Storage");

else {

mLabels.add("External SD Card 1");

j = 1;

}

}

if (mMounts.size() > 1) {

for (int i = 1; i < mMounts.size(); i++) {

mLabels.add("External SD Card " + (i + j));

}

}

}

labels = new String[mLabels.size()];

mLabels.toArray(labels);

paths = new String[mMounts.size()];

mMounts.toArray(paths);

Constants.mMounts = (ArrayList) mMounts.clone();

Constants.mLabels = (ArrayList) mLabels.clone();

count = Math.min(labels.length, paths.length);

// don't need this anymore, clear the mounts list to reduce memory

// use and to prepare it for the next time it's needed.

mMounts.clear();

}

}

这个代码可以帮助您找到所有SD卡和外部存储路径

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