获取手机SD卡的剩余容量(MB)

 /**
     * 判断SD卡的剩余容量
     * 
     */
 public long isAvaiableSpace(int sizeMb) {
  long availableSpare = 0;
  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();
   availableSpare = (blocks * blockSize) / (1024 * 1024);
   Log.d("剩余空间", "availableSpare = " + availableSpare);
  }
  return availableSpare;
 }