Android 记住密码和自动登录界面的实现


SharedPreferences介绍：

SharedPreferences是Android平台上一个轻量级的存储类，主要是保存一些常用的配置参数，它是采用xml文件存放数据的，文件存放在"/data/data<package name>/shared_prefs"目录下。

SharedPreferences的用法：

由于SharedPreferences是一个接口，而且在这个接口里没有提供写入数据和读取数据的能力。但它是通过其Editor接口中的一些方法来操作SharedPreference的,用法见下面代码：

Context.getSharedPreferences(String name,int mode)来得到一个SharedPreferences实例

name：是指文件名称，不需要加后缀.xml，系统会自动为我们添加上。
mode：是指定读写方式，其值有三种，分别为：
Context.MODE_PRIVATE：指定该SharedPreferences数据只能被本应用程序读、写

Context.MODE_WORLD_READABLE：指定该SharedPreferences数据能被其他应用程序读，但不能写

Context.MODE_WORLD_WRITEABLE：指定该SharedPreferences数据能被其他应用程序读写。

结果截图：
















工程目录：



Java代码

LoginActivity.java

[java]
view plaincopyprint?

<span style='font-family: "Courier New";'>package com.liu.activity;

import android.app.Activity;
import android.app.backup.SharedPreferencesBackupHelper;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.text.Spannable;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;

public class LoginActivity extends Activity {

private EditText userName, password;
private CheckBox rem_pw, auto_login;
private Button btn_login;
private ImageButton btnQuit;
private String userNameValue,passwordValue;
private SharedPreferences sp;

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

//去除标题
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.login);

//获得实例对象
sp = this.getSharedPreferences("userInfo", Context.MODE_WORLD_READABLE);
userName = (EditText) findViewById(R.id.et_zh);
password = (EditText) findViewById(R.id.et_mima);
rem_pw = (CheckBox) findViewById(R.id.cb_mima);
auto_login = (CheckBox) findViewById(R.id.cb_auto);
btn_login = (Button) findViewById(R.id.btn_login);
btnQuit = (ImageButton)findViewById(R.id.img_btn);

//判断记住密码多选框的状态
if(sp.getBoolean("ISCHECK", false))
{
//设置默认是记录密码状态
rem_pw.setChecked(true);
userName.setText(sp.getString("USER_NAME", ""));
password.setText(sp.getString("PASSWORD", ""));
//判断自动登陆多选框状态
if(sp.getBoolean("AUTO_ISCHECK", false))
{
//设置默认是自动登录状态
auto_login.setChecked(true);
//跳转界面
Intent intent = new Intent(LoginActivity.this,LogoActivity.class);
LoginActivity.this.startActivity(intent);

}
}

// 登录监听事件 现在默认为用户名为：liu 密码：123
btn_login.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
userNameValue = userName.getText().toString();
passwordValue = password.getText().toString();

if(userNameValue.equals("liu")&&passwordValue.equals("123"))
{
Toast.makeText(LoginActivity.this,"登录成功", Toast.LENGTH_SHORT).show();
//登录成功和记住密码框为选中状态才保存用户信息
if(rem_pw.isChecked())
{
//记住用户名、密码、
Editor editor = sp.edit();
editor.putString("USER_NAME", userNameValue);
editor.putString("PASSWORD",passwordValue);
editor.commit();
}
//跳转界面
Intent intent = new Intent(LoginActivity.this,LogoActivity.class);
LoginActivity.this.startActivity(intent);
//finish();

}else{

Toast.makeText(LoginActivity.this,"用户名或密码错误，请重新登录", Toast.LENGTH_LONG).show();
}

}
});

//监听记住密码多选框按钮事件
rem_pw.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
if (rem_pw.isChecked()) {

System.out.println("记住密码已选中");
sp.edit().putBoolean("ISCHECK", true).commit();

}else {

System.out.println("记住密码没有选中");
sp.edit().putBoolean("ISCHECK", false).commit();

}

}
});

//监听自动登录多选框事件
auto_login.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
if (auto_login.isChecked()) {
System.out.println("自动登录已选中");
sp.edit().putBoolean("AUTO_ISCHECK", true).commit();

} else {
System.out.println("自动登录没有选中");
sp.edit().putBoolean("AUTO_ISCHECK", false).commit();
}
}
});

btnQuit.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
finish();
}
});

}
}</span>

<span style="font-family: 'Courier New';">package com.liu.activity;

import android.app.Activity;
import android.app.backup.SharedPreferencesBackupHelper;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.text.Spannable;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;

public class LoginActivity extends Activity {

private EditText userName, password;
private CheckBox rem_pw, auto_login;
private Button btn_login;
private ImageButton btnQuit;
private String userNameValue,passwordValue;
private SharedPreferences sp;

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

//去除标题
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.login);

//获得实例对象
sp = this.getSharedPreferences("userInfo", Context.MODE_WORLD_READABLE);
userName = (EditText) findViewById(R.id.et_zh);
password = (EditText) findViewById(R.id.et_mima);
rem_pw = (CheckBox) findViewById(R.id.cb_mima);
auto_login = (CheckBox) findViewById(R.id.cb_auto);
btn_login = (Button) findViewById(R.id.btn_login);
btnQuit = (ImageButton)findViewById(R.id.img_btn);

//判断记住密码多选框的状态
if(sp.getBoolean("ISCHECK", false))
{
//设置默认是记录密码状态
rem_pw.setChecked(true);
userName.setText(sp.getString("USER_NAME", ""));
password.setText(sp.getString("PASSWORD", ""));
//判断自动登陆多选框状态
if(sp.getBoolean("AUTO_ISCHECK", false))
{
//设置默认是自动登录状态
auto_login.setChecked(true);
//跳转界面
Intent intent = new Intent(LoginActivity.this,LogoActivity.class);
LoginActivity.this.startActivity(intent);

}
}

// 登录监听事件  现在默认为用户名为：liu 密码：123
btn_login.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
userNameValue = userName.getText().toString();
passwordValue = password.getText().toString();

if(userNameValue.equals("liu")&&passwordValue.equals("123"))
{
Toast.makeText(LoginActivity.this,"登录成功", Toast.LENGTH_SHORT).show();
//登录成功和记住密码框为选中状态才保存用户信息
if(rem_pw.isChecked())
{
//记住用户名、密码、
Editor editor = sp.edit();
editor.putString("USER_NAME", userNameValue);
editor.putString("PASSWORD",passwordValue);
editor.commit();
}
//跳转界面
Intent intent = new Intent(LoginActivity.this,LogoActivity.class);
LoginActivity.this.startActivity(intent);
//finish();

}else{

Toast.makeText(LoginActivity.this,"用户名或密码错误，请重新登录", Toast.LENGTH_LONG).show();
}

}
});

//监听记住密码多选框按钮事件
rem_pw.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
if (rem_pw.isChecked()) {

System.out.println("记住密码已选中");
sp.edit().putBoolean("ISCHECK", true).commit();

}else {

System.out.println("记住密码没有选中");
sp.edit().putBoolean("ISCHECK", false).commit();

}

}
});

//监听自动登录多选框事件
auto_login.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
if (auto_login.isChecked()) {
System.out.println("自动登录已选中");
sp.edit().putBoolean("AUTO_ISCHECK", true).commit();

} else {
System.out.println("自动登录没有选中");
sp.edit().putBoolean("AUTO_ISCHECK", false).commit();
}
}
});

btnQuit.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
finish();
}
});

}
}</span>

LogoActivity.java

[java]
view plaincopyprint?

<span style='font-family: "Courier New";'>package com.liu.activity;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.opengl.ETC1;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ProgressBar;

public class LogoActivity extends Activity {
private ProgressBar progressBar;
private Button backButton;

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 去除标题
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.logo);

progressBar = (ProgressBar) findViewById(R.id.pgBar);
backButton = (Button) findViewById(R.id.btn_back);

Intent intent = new Intent(this, WelcomeAvtivity.class);
LogoActivity.this.startActivity(intent);

backButton.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
finish();

}
});

}

}
</span>

<span style="font-family: 'Courier New';">package com.liu.activity;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.opengl.ETC1;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ProgressBar;

public class LogoActivity extends Activity {
private ProgressBar progressBar;
private Button backButton;

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 去除标题
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.logo);

progressBar = (ProgressBar) findViewById(R.id.pgBar);
backButton = (Button) findViewById(R.id.btn_back);

Intent intent = new Intent(this, WelcomeAvtivity.class);
LogoActivity.this.startActivity(intent);

backButton.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
finish();

}
});

}

}
</span>

WelcomeActivity.java

[java]
view plaincopyprint?

<span style='font-family: "Courier New";'><span style="white-space: pre; background-color: rgb(240, 240, 240);">package com.liu.activity;</span>
import android.app.Activity;
import android.os.Bundle;

public class WelcomeAvtivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.welcome);
}

}</span>

<span style="font-family: 'Courier New';"><span style="white-space: pre; background-color: rgb(240, 240, 240);">package com.liu.activity;</span>
import android.app.Activity;
import android.os.Bundle;

public class WelcomeAvtivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.welcome);
}

}</span>

布局文件：

login.xml文件

[html]
view plaincopyprint?

<span style='font-family: "Courier New";'><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/logo_bg"
android:orientation="vertical" >

<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<ImageButton
android:id="@+id/img_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:background="@drawable/quit"/>

<TextView
android:id="@+id/tv_zh"
android:layout_width="wrap_content"
android:layout_height="35dip"
android:layout_marginLeft="12dip"
android:layout_marginTop="10dip"
android:gravity="bottom"
android:text="帐号:"
android:textColor="#000000"
android:textSize="18sp" />

<EditText
android:id="@+id/et_zh"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_below="@id/tv_zh"
android:layout_marginLeft="12dip"
android:layout_marginRight="10dip" />

<TextView
android:id="@+id/tv_mima"
android:layout_width="wrap_content"
android:layout_height="35dip"
android:layout_below="@id/et_zh"
android:layout_marginLeft="12dip"
android:layout_marginTop="10dip"
android:gravity="bottom"
android:text="密码:"
android:textColor="#000000"
android:textSize="18sp" />

<EditText
android:id="@+id/et_mima"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_below="@id/tv_mima"
android:layout_marginLeft="12dip"
android:layout_marginRight="10dip"
android:maxLines="200"
android:password="true"
android:scrollHorizontally="true" />

<CheckBox
android:id="@+id/cb_mima"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/et_mima"
android:layout_marginLeft="12dip"
android:text="记住密码"
android:textColor="#000000" />

<CheckBox
android:id="@+id/cb_auto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/cb_mima"
android:layout_marginLeft="12dip"
android:text="自动登录"
android:textColor="#000000" />
<Button
android:id="@+id/btn_login"
android:layout_width="80dip"
android:layout_height="40dip"
android:layout_below="@id/et_mima"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/cb_auto"
android:layout_marginRight="10dip"
android:gravity="center"
android:text="登录"
android:textColor="#000000"
android:textSize="18sp"/>

</RelativeLayout>

</LinearLayout></span>

<span style="font-family: 'Courier New';"><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/logo_bg"
android:orientation="vertical" >

<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<ImageButton
android:id="@+id/img_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:background="@drawable/quit"/>

<TextView
android:id="@+id/tv_zh"
android:layout_width="wrap_content"
android:layout_height="35dip"
android:layout_marginLeft="12dip"
android:layout_marginTop="10dip"
android:gravity="bottom"
android:text="帐号:"
android:textColor="#000000"
android:textSize="18sp" />

<EditText
android:id="@+id/et_zh"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_below="@id/tv_zh"
android:layout_marginLeft="12dip"
android:layout_marginRight="10dip" />

<TextView
android:id="@+id/tv_mima"
android:layout_width="wrap_content"
android:layout_height="35dip"
android:layout_below="@id/et_zh"
android:layout_marginLeft="12dip"
android:layout_marginTop="10dip"
android:gravity="bottom"
android:text="密码:"
android:textColor="#000000"
android:textSize="18sp" />

<EditText
android:id="@+id/et_mima"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_below="@id/tv_mima"
android:layout_marginLeft="12dip"
android:layout_marginRight="10dip"
android:maxLines="200"
android:password="true"
android:scrollHorizontally="true" />

<CheckBox
android:id="@+id/cb_mima"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/et_mima"
android:layout_marginLeft="12dip"
android:text="记住密码"
android:textColor="#000000" />

<CheckBox
android:id="@+id/cb_auto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/cb_mima"
android:layout_marginLeft="12dip"
android:text="自动登录"
android:textColor="#000000" />
<Button
android:id="@+id/btn_login"
android:layout_width="80dip"
android:layout_height="40dip"
android:layout_below="@id/et_mima"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/cb_auto"
android:layout_marginRight="10dip"
android:gravity="center"
android:text="登录"
android:textColor="#000000"
android:textSize="18sp"/>

</RelativeLayout>

</LinearLayout></span>

logo.xml文件

[html]
view plaincopyprint?

<span style='font-family: "Courier New";'><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/logo_bg"
android:orientation="vertical" >

<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="3">

<ProgressBar
android:id="@+id/pgBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />

<TextView
android:id="@+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/pgBar"
android:layout_centerHorizontal="true"
android:text="正在登录..."
android:textColor="#000000"
android:textSize="18sp" />
</RelativeLayout>

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" >

<Button
android:id="@+id/btn_back"
android:layout_width="70dip"
android:layout_height="35dip"
android:text="取消"
android:textColor="#000000"
android:textSize="12sp" />
</LinearLayout>

</LinearLayout></span>

<span style="font-family: 'Courier New';"><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/logo_bg"
android:orientation="vertical" >

<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="3">

<ProgressBar
android:id="@+id/pgBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />

<TextView
android:id="@+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/pgBar"
android:layout_centerHorizontal="true"
android:text="正在登录..."
android:textColor="#000000"
android:textSize="18sp" />
</RelativeLayout>

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" >

<Button
android:id="@+id/btn_back"
android:layout_width="70dip"
android:layout_height="35dip"
android:text="取消"
android:textColor="#000000"
android:textSize="12sp" />
</LinearLayout>

</LinearLayout></span>

welcome.xml

[html]
view plaincopyprint?

<span style='font-family: "Courier New";'><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:background="@drawable/login_bg"
android:orientation="vertical" >

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="登陆成功，进入用户界面"
android:textColor="#000000"
android:textSize="20sp" />

</LinearLayout></span>

<span style="font-family: 'Courier New';"><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:background="@drawable/login_bg"
android:orientation="vertical" >

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="登陆成功，进入用户界面"
android:textColor="#000000"
android:textSize="20sp" />

</LinearLayout></span>

工程下载连接：点击打开链接