/**
   * 獲取手機內(nèi)部空間總大小
   *
   * @return 大小，字節(jié)為單位
   */
  static public long getTotalInternalMemorySize() {
    //獲取內(nèi)部存儲根目錄
    File path = Environment.getDataDirectory();
    //系統(tǒng)的空間描述類
    StatFs stat = new StatFs(path.getPath());
    //每個區(qū)塊占字節(jié)數(shù)
    long blockSize = stat.getBlockSize();
    //區(qū)塊總數(shù)
    long totalBlocks = stat.getBlockCount();
    return totalBlocks * blockSize;
  }

  /**
   * 獲取手機內(nèi)部可用空間大小
   *
   * @return 大小，字節(jié)為單位
   */
  static public long getAvailableInternalMemorySize() {
    File path = Environment.getDataDirectory();
    StatFs stat = new StatFs(path.getPath());
    long blockSize = stat.getBlockSize();
    //獲取可用區(qū)塊數(shù)量
    long availableBlocks = stat.getAvailableBlocks();
    return availableBlocks * blockSize;
  }

  /**
   * 判斷SD卡是否可用
   *
   * @return true : 可用<br>false : 不可用
   */
  public static boolean isSDCardEnable() {
    return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
  }

/**
   * 獲取手機外部總空間大小
   *
   * @return 總大小，字節(jié)為單位
   */
  static public long getTotalExternalMemorySize() {
    if (isSDCardEnable()) {
      //獲取SDCard根目錄
      File path = Environment.getExternalStorageDirectory();
      StatFs stat = new StatFs(path.getPath());
      long blockSize = stat.getBlockSize();
      long totalBlocks = stat.getBlockCount();
      return totalBlocks * blockSize;
    } else {
      return -1;
    }
  }

  /**
   * 獲取SD卡剩余空間
   *
   * @return SD卡剩余空間
   */
  @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
  public static String getFreeSpace() {
    if (!isSDCardEnable()) return "sdcard unable!";
    StatFs stat = new StatFs(getSDCardPath());
    long blockSize, availableBlocks;
    availableBlocks = stat.getAvailableBlocksLong();
    blockSize = stat.getBlockSizeLong();
    long size = availableBlocks * blockSize / 1024L;
    return String.valueOf(size);
  }

/**
   * 獲取SD卡信息
   *
   * @return SDCardInfo
   */
  @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
  public static String getSDCardInfo() {
    SDCardInfo sd = new SDCardInfo();
    if (!isSDCardEnable()) return "sdcard unable!";
    sd.isExist = true;
    StatFs sf = new StatFs(Environment.getExternalStorageDirectory().getPath());
    sd.totalBlocks = sf.getBlockCountLong();
    sd.blockByteSize = sf.getBlockSizeLong();
    sd.availableBlocks = sf.getAvailableBlocksLong();
    sd.availableBytes = sf.getAvailableBytes();
    sd.freeBlocks = sf.getFreeBlocksLong();
    sd.freeBytes = sf.getFreeBytes();
    sd.totalBytes = sf.getTotalBytes();
    return sd.toString();
  }

  public static class SDCardInfo {
    boolean isExist;
    long totalBlocks;
    long freeBlocks;
    long availableBlocks;
    long blockByteSize;
    long totalBytes;
    long freeBytes;
    long availableBytes;

    @Override
    public String toString() {
      return "isExist=" + isExist +
          "\ntotalBlocks=" + totalBlocks +
          "\nfreeBlocks=" + freeBlocks +
          "\navailableBlocks=" + availableBlocks +
          "\nblockByteSize=" + blockByteSize +
          "\ntotalBytes=" + totalBytes +
          "\nfreeBytes=" + freeBytes +
          "\navailableBytes=" + availableBytes;
    }
  }