SdCardDirUtils

public class SdCardDirUtils {


    /**
     * 遍历 "system/etc/vold.fstab” 文件，获取全部的Android的挂载点信息
     *
     * @return
     */
    private static ArrayList
 
   getDevMountList() {
        String path = FileUtils.readFile("/system/etc/vold.fstab");
        ArrayList
  
    out = new ArrayList
   
    (); if (path != null) { String[] toSearch = path.split(" "); for (int i = 0; i < toSearch.length; i++) { if (toSearch[i].contains("dev_mount")) { if (new File(toSearch[i + 2]).exists()) { out.add(toSearch[i + 2]); } } } } return out; } /** * 获取扩展SD卡存储目录 * 
    
 * 如果有外接的SD卡，并且已挂载，则返回这个外置SD卡目录 * 否则：返回内置SD卡目录 * * @return */ public static List
     
       getExternalSdCardPath() { String path = null; ArrayList
      
        fileHolderList = new ArrayList<>(); ArrayList
       
         devMountList = getDevMountList(); for (String devMount : devMountList) { File file = new File(devMount); if (file.isDirectory() && file.canWrite()) { path = file.getAbsolutePath(); String timeStamp = new SimpleDateFormat("ddMMyyyy_HHmmss").format(new Date()); File testWritable = new File(path, "test_" + timeStamp); if (testWritable.mkdirs()) { testWritable.delete(); addDirInfoToList(fileHolderList, file); } } } if (SDCardUtils.isMounted()) { File sdCardFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath()); addDirInfoToList(fileHolderList, sdCardFile); } return fileHolderList; } private static void addDirInfoToList(List
        
          fileHolderList, File sdCardFile) { FileHolder fileHolder = new FileHolder(); fileHolder.name = sdCardFile.getName(); fileHolder.dirPath = sdCardFile.getAbsolutePath(); fileHolder.usableSpace = sdCardFile.getUsableSpace(); fileHolder.totalSpace = sdCardFile.getTotalSpace(); if (fileHolderList.contains(fileHolder)) return; fileHolderList.add(fileHolder); } public static class FileHolder { private String dirPath; private String name; private long usableSpace;//可用大小 private long totalSpace;//总大小 public String getDirPath() { return dirPath; } public long getUsableSpace() { return usableSpace; } public long getTotalSpace() { return totalSpace; } @Override public boolean equals(Object obj) { if (obj == null) return false; if (this == obj) { return true; } if (obj instanceof FileHolder) { FileHolder fileHolder = (FileHolder) obj; return (fileHolder.dirPath).equals(this.dirPath); } return false; } @Override public String toString() { return "当前存储卡的名称为[" + name + "]当前存储路径为[" + dirPath + "]可用大小为[" + usableSpace / 1024 / 1024 + "M]" + "]总大小为[" + ((float) totalSpace / 1024 / 1024 / 1024) + "G]"; } } }