One of the ways that Android stores files---sharedpreferences content providers, storing data in an XML way. is a lightweight file data store

Source: Internet
Author: User
Tags gettext

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 //UI界面的布局 文件<br><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="fill_parent"//填充父元素  线性布局<br>    android:layout_height="fill_parent"     android:orientation="vertical" >     <EditText         android:id="@+id/UserName"//id名称方便后台获取到该控件名称来去控件里面的值<br>        android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:ems="10"         android:inputType="text" >         <requestFocus />     </EditText>     <EditText         android:id="@+id/Password"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:inputType="text" />     <LinearLayout         android:layout_width="fill_parent"         android:layout_height="wrap_content" >         <Button             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:onClick="login"//在该Button按钮上面绑定onClick()方法 login和后台中的login名称需要一直,否则将找不到后台的方法<br>            android:text="登陆"             android:width="80dp" />         <CheckBox             android:id="@+id/saveUserAndPassword"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_marginLeft="180dp" />     </LinearLayout> </LinearLayout>

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47) 48 49 package com.example.saveuserandpasswor; import android.app.Activity; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import android.os.Bundle; import android.view.Menu; import android.view.View; import android.widget.CheckBox; import android.widget.EditText; import android.widget.Toast;<br>/**<br> *模拟一个简单的用户登录时保存密码的功能。该demo 没有对密码进行加密,处于安全考虑可以使用MD5或UUID进行密码加密  --后台代码<br> */ public class MainActivity extends Activity {    private EditText userName;     private EditText password;     private CheckBox cb;     private SharedPreferences sp;// 内容提供者    @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         userName = (EditText) findViewById(R.id.UserName);//获取ui界面中的空间元素         password = (EditText) findViewById(R.id.Password);         cb = (CheckBox) findViewById(R.id.saveUserAndPassword);         sp = getSharedPreferences("save", MODE_PRIVATE);// 设置保存信息的配置文件是私有的文件,存储问文件形式以xml文件存储,其实就是一个map                                                         // 集合         String username = sp.getString("username", "");         String pass = sp.getString("password", "");         if (username.length() != 0 && pass.length() != 0) {             userName.setText(username);             password.setText(pass);             cb.setChecked(true);         }    }    public void login(View view) {//在UI界面里面对Button按钮进行事件绑定,onclick() 方法<br>     String user = userName.getText().toString();         String pass = password.getText().toString();         boolean iscb = cb.isChecked();         Editor editor = sp.edit();// 获取编辑器         if (iscb) {// 如果checkbox 被选中则保存用户名和密码             editor.putString("username", user);             editor.putString("password", pass);         } else {             editor.putString("username", "");             editor.putString("password", "");         }         editor.commit();// 登陆完事后将用户输入的账号密码保存到配置文件中         Toast.makeText(getApplicationContext(), "登陆成功", Toast.LENGTH_SHORT)// 操作完成一个时间后执行的操作                 .show();     }    @Override     public boolean onCreateOptionsMenu(Menu menu) {         getMenuInflater().inflate(R.menu.activity_main, menu);         return true;     } }

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