SharedPreferences用法

最新推荐文章于 2025-09-11 23:53:02 发布

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最新推荐文章于 2025-09-11 23:53:02 发布

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文章标签：移动开发

原文链接：http://www.cnblogs.com/dachao/archive/2012/05/28/2520981.html

本文介绍了一个简单的登录界面实现，包括用户信息的加载与保存功能，通过使用SharedPreferences进行本地存储。

package com.android.test;
  2
  3
  4 import android.app.Activity;
  7 import android.content.Intent;
  8 import android.content.SharedPreferences;
  9 import android.content.SharedPreferences.Editor;
10 import android.os.Bundle;

13 import android.view.View;
15 import android.widget.CheckBox;
16 import android.widget.EditText;
17
24
25 /**
26  * 登录界面
27  */
28 public class LoginActivity extends Activity {
29
30     private static final String PREFS_NAME = "MyUserInfo";
34     private CheckBox chkSaveInfo;
35     private EditText txtUserName;
36     private EditText txtPassword;

38
73
74     /** Called when the activity is first created. */
75     @Override
76     public void onCreate(Bundle savedInstanceState) {
77         super.onCreate(savedInstanceState);
78         setContentView(R.layout.loginview);

82         chkSaveInfo = (CheckBox) this.findViewById(R.id.chkSaveInfo);
83         txtUserName = (EditText) this.findViewById(R.id.txtUserName);
84         txtPassword = (EditText) this.findViewById(R.id.txtPassword);

87
88         LoadUserData();
89     }
90
91     /**
92      * 载入已记住用户信息
93      */
94     private void LoadUserData(){

//载入配置文件
95 SharedPreferences sp = getSharedPreferences(PREFS_NAME, 0);

//读取配置文件

96         if (sp.getBoolean("isSave", false)){
97             String userName = sp.getString("userName", "");
98             String userPassword = sp.getString("userPassword", "");
99             if (!("".equals(userName) && "".equals(userPassword))){
100                 txtUserName.setText(userName);
101                 txtPassword.setText(userPassword);
102                 chkSaveInfo.setChecked(true);
103             }
104         }
105     }
107     /**
108      * 保存用户信息
109      */
110     private void SaveUserData(){

//载入配置文件
111 SharedPreferences sp = getSharedPreferences(PREFS_NAME, 0);

            //写入配置文件
112         Editor spEd = sp.edit();
113         if (chkSaveInfo.isChecked()){
114             spEd.putBoolean("isSave", true);
115             spEd.putString("userName", txtUserName.getText().toString());
116             spEd.putString("userPassword", txtPassword.getText().toString());
117         }
118         else{
119             spEd.putBoolean("isSave", false);
120             spEd.putString("userName", "");
121             spEd.putString("userPassword", "");
122         }
123         spEd.commit();
124     }
209 }

转载于:https://www.cnblogs.com/dachao/archive/2012/05/28/2520981.html