MiniTwitter中记住密码功能的实现

主要功能代码如下：

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);

        //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：xuyinghui 密码：123
        btn_login.setOnClickListener(new OnClickListener() {

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

                if(userNameValue.equals("xuyinghui")&&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();
            }
        });

    }
}

页面布局：建立一个activity_main.xml

<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:orientation="vertical"
   android:background="@drawable/loginbg"
   android:paddingBottom="@dimen/activity_vertical_margin"
   android:paddingLeft="@dimen/activity_horizontal_margin"
   android:paddingRight="@dimen/activity_horizontal_margin"
   android:paddingTop="@dimen/activity_vertical_margin"
   tools:context=".MainActivity" > 

  <include layout="@layout/login_top"/>
  <include layout="@layout/login_bottom"/>" 

  </LinearLayout>  

详细的页面布局设计：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >   

    <TextView
        android:id="@+id/tvRegist"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="21dp"
        android:layout_marginTop="18dp"
        android:text="@string/tvRegister"
        android:autoLink="all"
        android:textColorLink="#FF0066CC" />   

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_marginBottom="24dp"
        android:src="@drawable/panda" />   

    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="28dp"
        android:src="@drawable/icon" />   

</RelativeLayout>  

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/btnbg_roundcorner"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin" >   

    <TextView
        android:id="@+id/tvUsername"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="@string/tvName"
        android:textAppearance="?android:attr/textAppearanceMedium" />   

    <EditText
        android:id="@+id/etUsername"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/tvUsername"
        android:layout_below="@+id/tvUsername"
        android:background="@android:drawable/edit_text"
        android:ems="10" >   

        <requestFocus />
    </EditText>   

    <TextView
        android:id="@+id/tvPassword"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/etUsername"
        android:layout_below="@+id/etUsername"
        android:text="@string/tvPassword"
        android:textAppearance="?android:attr/textAppearanceMedium" />   

    <EditText
        android:id="@+id/etPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/tvPassword"
        android:layout_below="@+id/tvPassword"
        android:layout_marginTop="16dp"
        android:background="@android:drawable/edit_text"
        android:ems="10"
        android:inputType="textPassword" />   

    <Button
        android:id="@+id/btnLogin"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/etPassword"
        android:layout_below="@+id/etPassword"
       android:layout_marginTop="20dp"
        android:background="#FF72CAE1"
        android:text="@string/btnLogin" />   

    <CheckBox
        android:id="@+id/cbRememberPass"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/etPassword"
        android:layout_alignTop="@+id/btnLogin"
        android:text="记住密码" />   

</RelativeLayout>