内部存储空间

我们知道，存储硬件的空间是按着区块来划分的，每个区块有固定的大小。存储设备的总大小=区块大小*区块数量。通过StatFs类，我们可以获取到总的区块，可用区块和每个区块的字节大小等信息。

/**
     * 获取手机内部空间总大小
     *
     * @return 大小，字节为单位
     */
    static public long getTotalInternalMemorySize() {
        //获取内部存储根目录
        File path = Environment.getDataDirectory();
        //系统的空间描述类
        StatFs stat = new StatFs(path.getPath());
        //每个区块占字节数
        long blockSize = stat.getBlockSize();
        //区块总数
        long totalBlocks = stat.getBlockCount();
        return totalBlocks * blockSize;
    }

    /**
     * 获取手机内部可用空间大小
     *
     * @return 大小，字节为单位
     */
    static public long getAvailableInternalMemorySize() {
        File path = Environment.getDataDirectory();
        StatFs stat = new StatFs(path.getPath());
        long blockSize = stat.getBlockSize();
        //获取可用区块数量
        long availableBlocks = stat.getAvailableBlocks();
        return availableBlocks * blockSize;
    }

用以上两个方法，就可以获得内部存储空间总大小和可用大小了。

sdcard外部存储空间

  /**
     * 判断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());
    }

/**
     * 获取手机外部总空间大小
     *
     * @return 总大小，字节为单位
     */
    static public long getTotalExternalMemorySize() {
        if (isSDCardEnable()) {
            //获取SDCard根目录
            File path = Environment.getExternalStorageDirectory();
            StatFs stat = new StatFs(path.getPath());
            long blockSize = stat.getBlockSize();
            long totalBlocks = stat.getBlockCount();
            return totalBlocks * blockSize;
        } else {
            return -1;
        }
    }

    /**
     * 获取SD卡剩余空间
     *
     * @return SD卡剩余空间
     */
    @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);
    }

统一描述sdcard的信息

/**
     * 获取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;
        }
    }