登录界面中密码与用户名的保存

1.谈到保存就不能不说SharedPreferences类。

  1）SharedPreferences是Android平台上一个轻量级的数据存储方式，通常用来存储一些简单的配置信息，例如用户名，密码，自定义参数的设置等。

  2）SharedPreferences的value值只能是float，int,long,boolean,String,StringSet。

2.源程序：

1）登录界面

<?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" />

</RelativeLayout>

<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_gravity="center"
android:layout_marginRight="10dip"
android:gravity="center"
android:text="登录"
android:textColor="#000000"
android:textSize="18sp"/>

</LinearLayout>

2)加载页面

<?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>

3）登录成功页面

<?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>

4）登陆界面

package com.liu.activity;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
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);

this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.login);

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);

if(sp.getBoolean("ISCHECK", false))
{

rem_pw.setChecked(true);
userName.setText(sp.getString("USER_NAME", ""));
password.setText(sp.getString("PASSWORD", ""));

if(sp.getBoolean("AUTO_ISCHECK", false))
{

auto_login.setChecked(true);

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

}
}

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,"", Toast.LENGTH_SHORT).show();

if(rem_pw.isChecked())
{

Editor editor = sp.edit();
editor.putString("USER_NAME", userNameValue);
editor.putString("PASSWORD",passwordValue);
editor.commit();
}

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

}else{

Toast.makeText(LoginActivity.this,"", Toast.LENGTH_LONG).show();
}

}
});

rem_pw.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
if (rem_pw.isChecked()) {

System.out.println("true");
sp.edit().putBoolean("ISCHECK", true).commit();

}else {

System.out.println("false");
sp.edit().putBoolean("ISCHECK", false).commit();

}

}
});

auto_login.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
if (auto_login.isChecked()) {
System.out.println("true");
sp.edit().putBoolean("AUTO_ISCHECK", true).commit();

} else {
System.out.println("false");
sp.edit().putBoolean("AUTO_ISCHECK", false).commit();
}
}
});

btnQuit.setOnClickListener(new OnClickListener() {

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

}

5）登录加载页面

package com.liu.activity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.ProgressBar;

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

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

this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.logo);

progressBar = (ProgressBar) findViewById(R.id.pgBar);
backButton = (Button) findViewById(R.id.btn_back);
progressBar.setMax(3000);

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

backButton.setOnClickListener(new OnClickListener() {

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

}
});

}

}

6)登陆成功界面

package com.liu.activity;

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);
}

}

图示：

登录页面

登录成功页面

登录加载页面

后记：老师的题目放在U盘中，不知道为啥没有了，崩溃了一阵后开始了上网搜，自己勉勉强强的做出如此。

PS：图片没有换，用的是原图片。