Created
December 17, 2018 09:34
-
-
Save DawnImpulse/e8fba278a786844f2a537f452c19a265 to your computer and use it in GitHub Desktop.
All storage devices on Android
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
public class ExternalStorage { | |
public static final String SD_CARD = "sdCard"; | |
public static final String EXTERNAL_SD_CARD = "externalSdCard"; | |
/** | |
* @return True if the external storage is available. False otherwise. | |
*/ | |
public static boolean isAvailable() { | |
String state = Environment.getExternalStorageState(); | |
if (Environment.MEDIA_MOUNTED.equals(state) || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) { | |
return true; | |
} | |
return false; | |
} | |
public static String getSdCardPath() { | |
return Environment.getExternalStorageDirectory().getPath() + "/"; | |
} | |
/** | |
* @return True if the external storage is writable. False otherwise. | |
*/ | |
public static boolean isWritable() { | |
String state = Environment.getExternalStorageState(); | |
if (Environment.MEDIA_MOUNTED.equals(state)) { | |
return true; | |
} | |
return false; | |
} | |
/** | |
* @return A map of all storage locations available | |
*/ | |
public static Map<String, File> getAllStorageLocations() { | |
Map<String, File> map = new HashMap<String, File>(10); | |
List<String> mMounts = new ArrayList<String>(10); | |
List<String> mVold = new ArrayList<String>(10); | |
mMounts.add("/mnt/sdcard"); | |
mVold.add("/mnt/sdcard"); | |
try { | |
File mountFile = new File("/proc/mounts"); | |
if(mountFile.exists()){ | |
Scanner scanner = new Scanner(mountFile); | |
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) { | |
e.printStackTrace(); | |
} | |
try { | |
File voldFile = new File("/system/etc/vold.fstab"); | |
if(voldFile.exists()){ | |
Scanner scanner = new Scanner(voldFile); | |
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(":")); | |
if (!element.equals("/mnt/sdcard")) | |
mVold.add(element); | |
} | |
} | |
} | |
} catch (Exception e) { | |
e.printStackTrace(); | |
} | |
for (int i = 0; i < mMounts.size(); i++) { | |
String mount = mMounts.get(i); | |
if (!mVold.contains(mount)) | |
mMounts.remove(i--); | |
} | |
mVold.clear(); | |
List<String> mountHash = new ArrayList<String>(10); | |
for(String mount : mMounts){ | |
File root = new File(mount); | |
if (root.exists() && root.isDirectory() && root.canWrite()) { | |
File[] list = root.listFiles(); | |
String hash = "["; | |
if(list!=null){ | |
for(File f : list){ | |
hash += f.getName().hashCode()+":"+f.length()+", "; | |
} | |
} | |
hash += "]"; | |
if(!mountHash.contains(hash)){ | |
String key = SD_CARD + "_" + map.size(); | |
if (map.size() == 0) { | |
key = SD_CARD; | |
} else if (map.size() == 1) { | |
key = EXTERNAL_SD_CARD; | |
} | |
mountHash.add(hash); | |
map.put(key, root); | |
} | |
} | |
} | |
mMounts.clear(); | |
if(map.isEmpty()){ | |
map.put(SD_CARD, Environment.getExternalStorageDirectory()); | |
} | |
return map; | |
} | |
} | |
// usage | |
/* Map<String, File> externalLocations = ExternalStorage.getAllStorageLocations(); | |
File sdCard = externalLocations.get(ExternalStorage.SD_CARD); | |
File externalSdCard = externalLocations.get(ExternalStorage.EXTERNAL_SD_CARD); */ |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment