如何查找 Android 上剩余的可用存储空间（磁盘空间）？ [复制]

我试图找出运行我的应用程序的 Android 手机上的可用磁盘空间。有没有办法以编程方式执行此操作？

Thanks,

示例：获取人类可读的大小，如 1 Gb

字符串内存 = bytesToHuman(totalMemory())

/*************************************************************************************************
Returns size in bytes.

If you need calculate external memory, change this: 
    StatFs statFs = new StatFs(Environment.getRootDirectory().getAbsolutePath());
to this: 
    StatFs statFs = new StatFs(Environment.getExternalStorageDirectory().getAbsolutePath());        
**************************************************************************************************/
    public long totalMemory()
    {
        StatFs statFs = new StatFs(Environment.getRootDirectory().getAbsolutePath());   
        long   total  = (statFs.getBlockCount() * statFs.getBlockSize());
        return total;
    }

    public long freeMemory()
    {
        StatFs statFs = new StatFs(Environment.getRootDirectory().getAbsolutePath());
        long   free   = (statFs.getAvailableBlocks() * statFs.getBlockSize());
        return free;
    }

    public long busyMemory()
    {
        StatFs statFs = new StatFs(Environment.getRootDirectory().getAbsolutePath());   
        long   total  = (statFs.getBlockCount() * statFs.getBlockSize());
        long   free   = (statFs.getAvailableBlocks() * statFs.getBlockSize());
        long   busy   = total - free;
        return busy;
    }

将字节转换为人类可读格式（如 1 Mb、1 Gb）

    public static String floatForm (double d)
    {
       return new DecimalFormat("#.##").format(d);
    }


    public static String bytesToHuman (long size)
    {
        long Kb = 1  * 1024;
        long Mb = Kb * 1024;
        long Gb = Mb * 1024;
        long Tb = Gb * 1024;
        long Pb = Tb * 1024;
        long Eb = Pb * 1024;

        if (size <  Kb)                 return floatForm(        size     ) + " byte";
        if (size >= Kb && size < Mb)    return floatForm((double)size / Kb) + " Kb";
        if (size >= Mb && size < Gb)    return floatForm((double)size / Mb) + " Mb";
        if (size >= Gb && size < Tb)    return floatForm((double)size / Gb) + " Gb";
        if (size >= Tb && size < Pb)    return floatForm((double)size / Tb) + " Tb";
        if (size >= Pb && size < Eb)    return floatForm((double)size / Pb) + " Pb";
        if (size >= Eb)                 return floatForm((double)size / Eb) + " Eb";

        return "???";
    }