保存数据到SD卡

来源：互联网发布：网上挂号预约软件编辑：程序博客网时间：2024/04/30 08:25

创建一个登录界面，输入账号密码，点击登录后保存账号密码到手机内部存储空间（如果勾选了保存密码复选框），再次启动读取文件信息将账号密码自动显示出来

数据操作代码：

package com.suzi.qqlogin.utils;import android.content.Context;import android.os.Environment;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStreamReader;import java.util.HashMap;import java.util.Map;/*** Created by Suzi on 2016/7/8.*/public class InfoUtilofSDCard{    /**    * 保存数据    * @param number    * @param password    * @return    */    public static boolean SaveInfo(Context contect, String number, String password)    {        //初始化数据        String info = number + "##" + password;        //判断sd卡是否可用        if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))        {            return false;        }        try        {            File f = Environment.getExternalStorageDirectory();  //得到内存卡地址            File file = new File(f, "qqlogin.txt");  //完整文件存储地址            FileOutputStream fos = new FileOutputStream(file);            fos.write(info.getBytes());            fos.flush();            fos.close();            return true;        } catch (Exception e)        {            e.printStackTrace();        }        return false;    }    /**    * 读取数据    *    * @return    */    public static Map<String, String> GetInfo(Context context)    {        //判断sd卡是否可用        if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))        {            return null;        }        try        {            File f = Environment.getExternalStorageDirectory();            File file = new File(f, "qqlogin.txt");            BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream                    (file)));            String info = reader.readLine();            reader.close();            Map<String, String> infoMap = new HashMap<String, String>();            String[] arr = info.split("##");            infoMap.put("number", arr[0]);            infoMap.put("password", arr[1]);            return infoMap;        } catch (Exception e)        {            e.printStackTrace();        }        return null;    }}

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