SdCardUtils

import android.os.Environment;
import android.os.StatFs;

public class SdCardUtils {
   public static boolean hasSdcard() {
      String state = Environment.getExternalStorageState();
      if (state.equals(Environment.MEDIA_MOUNTED)) {
         return true;
      } else {
         return false;
      }
   }

   /**
    * 计算sdcard上的剩余空间
    * 
    * @return
    */
   public int freeSpaceOnSd() {
      StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getPath());
      // (availableBlocks * blockSize)/1024 KIB 单位
      // (availableBlocks * blockSize)/1024 /1024 MIB单位
      double sdFreeMB = ((double) stat.getAvailableBlocks() * (double) stat.getBlockSize()) / (1024 * 1024);
      return (int) sdFreeMB;
   }
}