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android开发,以记住用户登录密码为例说明SharedPreferences的简单应用
SharedPreferences是以键值对来存储应用程序的配置信息的一种方式,以下以记住用户登录密码为例,来说明SharedPreferences的简单应用。
代码如下:- 1 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 }
-
复制代码 代码是从项目里摘出来的,只用于说明问题,请见谅。欢迎指正,不胜感激。 |
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