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/** 
 * 计算剩余空间 
 * @param path 
 * @return 
 */  
private static long getAvailableSize(String path)  
{  
    StatFs fileStats = new StatFs(path);  
    fileStats.restat(path);  
    return (long) fileStats.getAvailableBlocks() * fileStats.getBlockSize(); // 注意与fileStats.getFreeBlocks()的区别  
}  
  
/** 
 * 计算总空间 
 * @param path 
 * @return 
 */  
private static long getTotalSize(String path)  
{  
    StatFs fileStats = new StatFs(path);  
    fileStats.restat(path);  
    return (long) fileStats.getBlockCount() * fileStats.getBlockSize();  
}  
  
/** 
 * 计算SD卡的剩余空间 
 * @return 剩余空间 
 */  
public static long getSDAvailableSize()  
{  
    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))  
    {  
        return getAvailableSize(Environment.getExternalStorageDirectory().toString());  
    }  
      
    return 0;  
}  
  
/** 
 * 计算系统的剩余空间 
 * @return 剩余空间 
 */  
public static long getSystemAvailableSize()  
{  
    // context.getFilesDir().getAbsolutePath();  
    return getAvailableSize("/data");  
}  
  
/** 
 * 是否有足够的空间 
 * @param filePath 文件路径，不是目录的路径 
 * @return 
 */  
public static boolean hasEnoughMemory(String filePath)  
{  
    File file = new File(filePath);  
    long length = file.length();  
    if (filePath.startsWith("/sdcard") || filePath.startsWith("/mnt/sdcard"))  
    {  
        return getSDAvailableSize() > length;  
    }  
    else  
    {  
        return getSystemAvailableSize() > length;  
    }  
      
}  
  
/** 
 * 获取SD卡的总空间 
 * @return 
 */  
public static long getSDTotalSize()  
{  
    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))  
    {  
        return getTotalSize(Environment.getExternalStorageDirectory().toString());  
    }  
      
    return 0;  
}  
  
/** 
 * 获取系统可读写的总空间 
 * @return 
 */  
public static long getSysTotalSize()  
{  
    return getTotalSize("/data");  
}