获取手机剩余空间工具类

import java.io.File;

import com.iss.utils.LogUtil;

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

/**
*  类名 
*  @author 王洪贺<br/>
*    获取手机剩余的存储空间工具类
*    创建日期 2014年8月1日
*/

public class StorageUtil {

    /**
    *  获取sd卡剩余存储空间
    *  @return 返回kb字节为单位的long整形数值
    */
    public static long readSDCard() {
        String state = Environment.getExternalStorageState();
        if (Environment.MEDIA_MOUNTED.equals(state)) {
            File sdcardDir = Environment.getExternalStorageDirectory();
            StatFs sf = new StatFs(sdcardDir.getPath());
            long blockSize = sf.getBlockSize();
            long blockCount = sf.getBlockCount();
            long availCount = sf.getAvailableBlocks();
           /* LogUtil.d("", "block大小:" + blockSize + ",block数目:" + blockCount + ",总大小:" + blockSize
                    * blockCount / 1024 + "KB");
            LogUtil.d("", "可用的block数目：:" + availCount + ",剩余空间:" + availCount * blockSize / 1024
                    + "KB");*/
            return availCount * blockSize / 1024;
        } else {
            return 0;
        }
    }

    /**
     *  获取sd卡剩余存储空间
     *  @return 返回M字节为单位的long整形数值
     */
    public static long readSDCardM() {
        return readSDCard() / 1024;
    }

    /**
     *  获取系统剩余存储空间
     *  @return 返回以KB为单位的long整形数值
     */
    public static long readSystem() {
        File root = Environment.getRootDirectory();
        StatFs sf = new StatFs(root.getPath());
        long blockSize = sf.getBlockSize();
        long blockCount = sf.getBlockCount();
        long availCount = sf.getAvailableBlocks();
        /*LogUtil.d("", "block大小:" + blockSize + ",block数目:" + blockCount + ",总大小:" + blockSize
                * blockCount / 1024 + "KB");
        LogUtil.d("", "可用的block数目：:" + availCount + ",可用大小:" + availCount * blockSize / 1024 + "KB");*/
        return availCount * blockSize / 1024;
    }

    /**
     *  获取系统剩余存储空间
     *  @return 返回以M为单位的long整形数值
     */
    public static long readSystemM() {
        return readSystem() / 1024;
    }

    /**
     *  判断剩余空间是否大于指定空间
     *  @param sizeMb 以MB为单位的指定大小
     *  @return 返回值true为有相应空间，false为小于对应空间
     */
    public static boolean isAvailableSpace(int sizeMb) {
        boolean hasSpace = false;
        long availableSpare = readSDCardM();
        if (availableSpare > sizeMb) {
            hasSpace = true;
        }
        return hasSpace;
    }

    /**
     *  判断剩余空间是否大于指定空间
     *  @return 返回值true为有100M，false为小于100M
     */
    public static boolean isAvailableSpace() {
        return isAvailableSpace(100);
    }
}