Android sharedpreference保存用户名和密码

package com.windvally.sharedpreferencestest;

import com.windvally.datasavefile.R;

import android.os.Bundle;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.content.SharedPreferences;

import android.text.Editable;

import android.text.TextWatcher;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.CheckBox;

import android.widget.CompoundButton;

import android.widget.CompoundButton.OnCheckedChangeListener;

import android.widget.EditText;

import android.widget.TextView;

public class SharedPreferencesTest extends Activity {

private EditText username_ET, password_ET;

private String username, password, lastusername_input, result = "";

private Button loginButton;

private CheckBox rem_username_CB, rem_password_CB, auto_login_CB;

private boolean if_rem_username, if_rem_password, if_auto_login;

private SharedPreferences lastusername, saveuserinfo;

private TextView resultTV;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_shared_preferences_test);

username_ET = (EditText) findViewById(R.id.username);

password_ET = (EditText) findViewById(R.id.password);

loginButton = (Button) findViewById(R.id.login);

rem_username_CB = (CheckBox) findViewById(R.id.rem_user);

rem_password_CB = (CheckBox) findViewById(R.id.rem_psw);

auto_login_CB = (CheckBox) findViewById(R.id.auto_login);

resultTV = (TextView) findViewById(R.id.result);

//首先，检查sharedpreference里保存的最后一次登录的用户名，根据用户名检查该用户保存的用户名密码和三个checkbox的状态来完成初始化。

init();

//初始化完成判断是否自动登录。如自动登录被选中，则开始自动登录。

check_autolog_selected();

//添加用户名输入框的输入字符的事件

username_ET.addTextChangedListener(new TextWatcher() {

@Override

public void onTextChanged(CharSequence s, int start, int before,

int count) {

// TODO Auto-generated method stub

String temp_username = username_ET.getText().toString().trim();

saveuserinfo = getSharedPreferences(temp_username, 0);

password = saveuserinfo.getString("password", "");

if_rem_username = saveuserinfo

.getBoolean("rem_username", false);

if_rem_password = saveuserinfo

.getBoolean("rem_password", false);

if_auto_login = saveuserinfo.getBoolean("auto_login", false);

rem_username_CB.setChecked(if_rem_username);

rem_password_CB.setChecked(if_rem_password);

auto_login_CB.setChecked(if_auto_login);

password_ET.setText(password);

rem_username_CB.setChecked(if_rem_username);

rem_password_CB.setChecked(if_rem_password);

auto_login_CB.setChecked(if_auto_login);

}

@Override

public void beforeTextChanged(CharSequence s, int start, int count,

int after) {

// TODO Auto-generated method stub

}

@Override

public void afterTextChanged(Editable s) {

// TODO Auto-generated method stub

}

});

//添加记住用户名选项的处理方法

rem_username_CB

.setOnCheckedChangeListener(new OnCheckedChangeListener() {

@Override

public void onCheckedChanged(CompoundButton buttonView,

boolean isChecked) {

// TODO Auto-generated method stub

if (!isChecked) {

rem_password_CB.setChecked(false);

auto_login_CB.setChecked(false);

}

}

});

//添加记住密码选项的处理方法

rem_password_CB

.setOnCheckedChangeListener(new OnCheckedChangeListener() {

@Override

public void onCheckedChanged(CompoundButton buttonView,

boolean isChecked) {

// TODO Auto-generated method stub

if (isChecked) {

rem_username_CB.setChecked(true);

}

if (!isChecked) {

auto_login_CB.setChecked(false);

}

}

});

//添加添加记住密码选项的处理方法

auto_login_CB.setOnCheckedChangeListener(new OnCheckedChangeListener() {

@Override

public void onCheckedChanged(CompoundButton buttonView,

boolean isChecked) {

// TODO Auto-generated method stub

if (isChecked) {

rem_username_CB.setChecked(true);

rem_password_CB.setChecked(true);

}

}

});

loginButton.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

checkandsaveSP();

}

});

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.shared_preferences_test, menu);

return true;

}

private void init(){

//初始化数据，读取sharedpreference里的数据填充各表现。

//lastusername是用来保存最近一次输入的用户名

lastusername = getSharedPreferences("lastusername", 0);

lastusername_input = lastusername.getString("lastusername", "");

//取出用户名后，读取这个用户名对应的密码和选项框状态

saveuserinfo = getSharedPreferences(lastusername_input, 0);

username = saveuserinfo.getString("username", "");

password = saveuserinfo.getString("password", "");

if_rem_username = saveuserinfo.getBoolean("rem_username", false);

if_rem_password = saveuserinfo.getBoolean("rem_password", false);

if_auto_login = saveuserinfo.getBoolean("auto_login", false);

rem_username_CB.setChecked(if_rem_username);

rem_password_CB.setChecked(if_rem_password);

auto_login_CB.setChecked(if_auto_login);

username_ET.setText(username);

password_ET.setText(password);

result += "username:" + username + "\n";

result += "password:" + password + "\n";

result += "if_rem_username:" + if_rem_username + "\n";

result += "if_rem_password:" + if_rem_password + "\n";

result += "if_auto_login:" + if_auto_login + "\n";

resultTV.setText(result);

}

private void check_autolog_selected(){

//如果选中了自动登录则开始自动登录

if(if_auto_login){

login(username,password);

}

}

private void login(String username,String password){

if (username.equals("aaaa")&&password.equals("aaaa")){

//这里可以加入代码进行页面跳转。示例只是弹出登录成功的对话框

AlertDialog.Builder passBuilder =new AlertDialog.Builder(this);

passBuilder.setTitle("登录成功");

passBuilder.setCancelable(false);

passBuilder.setNegativeButton("确定",new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

// TODO Auto-generated method stub

}

});

passBuilder.create();

passBuilder.show();

}

else{

AlertDialog.Builder passBuilder =new AlertDialog.Builder(this);

passBuilder.setTitle("用户名密码错误");

passBuilder.setCancelable(false);

passBuilder.setNegativeButton("确定",new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

// TODO Auto-generated method stub

//密码错误不做任何处理

}

});

passBuilder.create();

passBuilder.show();

}

}

private void checkandsaveSP(){

//点击登陆后检查所有选项，记录最后登录的用户名，按选项将用户名密码和三个选项框状态写入Sharepreference中

// TODO Auto-generated method stub

username = username_ET.getText().toString().trim();

password = password_ET.getText().toString().trim();

if_rem_username = rem_username_CB.isChecked();

if_rem_password = rem_password_CB.isChecked();

if_auto_login = auto_login_CB.isChecked();

lastusername.edit().putString("lastusername", username)

.commit();

lastusername.edit().commit();

saveuserinfo = getSharedPreferences(username, 0);

if (if_rem_username) {

saveuserinfo.edit().putString("username", username)

.commit();

}

if(!if_rem_username){

saveuserinfo.edit().putString("username", "").commit();

}

if (if_rem_password) {

saveuserinfo.edit().putString("password", password)

.commit();

}

if(!if_rem_password){

saveuserinfo.edit().putString("password", "").commit();

}

saveuserinfo.edit().putBoolean("rem_username", if_rem_username)

.commit();

saveuserinfo.edit().putBoolean("rem_password", if_rem_password)

.commit();

saveuserinfo.edit().putBoolean("auto_login", if_auto_login)

.commit();

result = "";

result += "lastusername is: " + username + "\n";

result += "username:" + username + "\n";

result += "password:" + password + "\n";

result += "if_rem_username:" + if_rem_username + "\n";

result += "if_rem_password:" + if_rem_password + "\n";

result += "if_auto_login:" + if_auto_login + "\n";

resultTV.setText(result);

//进行登录处理

login(username,password);

}

}

对应的布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center"

android:orientation="vertical" >

<TextView

android:id="@+id/welcom_welcome"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textColor="#B67044"

android:singleLine="true"

android:text="欢迎光临SharedPreference测试页面" />

<TableLayout

android:layout_width="wrap_content"

android:layout_height="wrap_content" >

<TableRow

android:layout_width="wrap_content"

android:layout_height="wrap_content" >

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="用户名"

android:textSize="20sp" />

<EditText

android:id="@+id/username"

android:layout_width="140sp"

android:layout_height="wrap_content"

android:inputType="text"

android:maxLength="16"

android:singleLine="true" />

</TableRow>

<TableRow

android:layout_width="wrap_content"

android:layout_height="wrap_content" >

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="密码"

android:textSize="20sp" />

<EditText

android:id="@+id/password"

android:layout_width="140sp"

android:layout_height="wrap_content"

android:maxLength="16"

android:singleLine="true" />

</TableRow>

</TableLayout>

<LinearLayout

android:layout_width="wrap_content"

android:layout_height="wrap_content" >

<CheckBox

android:id="@+id/rem_user"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="记住用户"

android:textSize="12px" >

</CheckBox>

<CheckBox

android:id="@+id/rem_psw"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="记住密码"

android:textSize="12px" >

</CheckBox>

<CheckBox

android:id="@+id/auto_login"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="自动登录"

android:textSize="12px" >

</CheckBox>

</LinearLayout>

<LinearLayout

android:layout_width="wrap_content"

android:layout_height="wrap_content" >

<Button

android:id="@+id/login"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="登录" />

<Button

android:id="@+id/regist"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="注册" />

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="忘记密码" />

</LinearLayout>

<TextView

android:id="@+id/result"

android:layout_width="match_parent"

android:layout_height="wrap_content"

/>

</LinearLayout>

sharedpreference文件的保存结果

shell@android:/data/data/com.windvally.datasavefile/shared_prefs # ls

ls

UserInfo.xml

aaa.xml

aaaa.xml

bbbb.xml

cccc.xml

dddd.xml

lastusername.xml

qqqq.xml

shell@android:/data/data/com.windvally.datasavefile/shared_prefs #

当然在实际应用中需要对密码进行加密处理，这里就不赘述了。