如何判断SD卡的剩余空间小于某个值

这是一个工具类，如果SD卡的剩余空间小于某个值返回false，如果有足够的控件，则返回true.

public class SDCardSizeUtil { public static boolean isAvaiableSpace(int sizeMb) {  boolean ishasSpace = false;  if (android.os.Environment.getExternalStorageState().equals(    android.os.Environment.MEDIA_MOUNTED)) {   String sdcard = Environment.getExternalStorageDirectory().getPath();   StatFs statFs = new StatFs(sdcard);   long blockSize = statFs.getBlockSize();   long blocks = statFs.getAvailableBlocks();   long availableSpare = (blocks * blockSize) / (1024 * 1024);   Log.d("剩余空间", "availableSpare = " + availableSpare);   if (availableSpare > sizeMb) {    ishasSpace = true;   }  }  return ishasSpace; }}