User user = (User) task.getTaskParam().get("user");
UserInfo userInfo = new UserInfo();
userInfo.setId(""+user.getId());   //获取用户ID
userInfo.setToken(OAuthConstant.getInstance().getToken());   //获取token
userInfo.setSecret(OAuthConstant.getInstance().getTokenSecret()); //获取TokenSecret
userInfo.setName(user.getName());  //用户名
userInfo.setDrawable(getBitmap(user.getProfileImageUrl()));   //用户头像URL地址，用来登录时使用
DataHelper dataHelper = new DataHelper(MainService.this);
dataHelper.SaveUserInfo(userInfo);   //保存用户信息

package com.cloay.weibo.db;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.List;

import com.cloay.weibo.bean.UserInfo;

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.sqliteDatabase;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
/**
 * 用来保存用户授权相关信息
 * @author Cloay
 * 2012-2-29
 * 下午08:47:08
 */
public class DataHelper {

    /**
     * 数据库名称
     */

    private static String DB_NAME = "cloay.db";

    /**
     * 数据库版本号
     */

    private static int DB_VERSION = 1;


    private sqliteHelper dbHelper;

    public DataHelper(Context context){

        dbHelper=new sqliteHelper(context,DB_NAME,null,DB_VERSION);


    }

    
    /**
     * 关闭数据库
     */
    public void closeDB() {

        dbHelper.close();

    }

    /**
     * 获取user_info表中的UserID、Access Token、Access Secret的记录
     * @param isAll
     * @return
     */

    public List<UserInfo> GetUserList(Boolean isAll){//isAll为true时获取全部消息，否则获取id,token,secret
        List<UserInfo> userList = new ArrayList<UserInfo>();
        sqliteDatabase database = dbHelper.getWritableDatabase();
        String sql = "select user_id,secret,name,drawable from user_info";
        Cursor cursor = database.rawQuery(sql,new String[] {});
        while (cursor.moveToNext()) {
        	UserInfo info = new UserInfo();
        	info.setId(cursor.getString(0));
        	info.setToken(cursor.getString(1));
        	info.setSecret(cursor.getString(2));
        	if(isAll){
        		info.setName(cursor.getString(3));
        		ByteArrayInputStream stream = new ByteArrayInputStream(cursor.getBlob(4));
        		Bitmap icon = BitmapFactory.decodeStream(stream);
        		info.setDrawable(icon);
        	}
        	userList.add(info);
        }
        cursor.close();
        closeDB();
        return userList;

    }

    

    /**
     * 判断users表中的是否包含某个UserID的记录
     * @param UserId
     * @return
     */

    public boolean HaveUserInfo(String UserId){
    	boolean isHave = false;
    	sqliteDatabase database = dbHelper.getReadableDatabase();
        String sql = "select count(*)  from user_info where user_id=?";
        Cursor cursor = database.rawQuery(sql,new String[] { UserId });
        isHave = cursor.moveToFirst();
        cursor.close();
        closeDB();
        return isHave;
    }


    /**
     * 添加users表的记录
     * @param user
     */

    public void SaveUserInfo(UserInfo user){
    	sqliteDatabase database = dbHelper.getWritableDatabase();
        String sql = "insert into user_info(id,user_id,drawable) values (?,?,?)";
        ByteArrayOutputStream os = new ByteArrayOutputStream();  
        // 将Bitmap压缩成PNG编码，质量为100%存储          
        user.getDrawable().compress(Bitmap.CompressFormat.PNG,100,os);
        //id我默认都为1了因为我只用了一个账号，大家保存的时候可设置成其他的
        Object[] bindArgs = {"1",user.getId(),user.getToken(),user.getSecret(),user.getName(),os.toByteArray()};
        database.execsql(sql,bindArgs);
        closeDB();
    }

    /**
     * 删除users表的记录
     * @param UserId
     */

    public void DelUserInfo(String UserId){
    	sqliteDatabase database = dbHelper.getReadableDatabase();
        database.delete("user_info","user_id=?",new String[] { UserId });
    	closeDB();
    }

}