Android可记住用户密码登陆界面

登陆界面程序运用了SharedPreferences

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。

结果截图：

工程目录：

JAVA 代码：

LoginActivity.java

com.example.minitwittersimulate;  

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(
4000
)) {  

                    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();  

            }  

        });  

    }  

}

WelcomeActivity.java

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);  

    }  

}  

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);

       }

}

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: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=".LoginActivity" >
    <include layout="@layout/login_top" />
 
  <include layout="@layout/login_bottom"/>"
</LinearLayout>

<?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" />
    <CheckBox
        android:id="@+id/rem_pw"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/etPassword"
        android:layout_below="@+id/etPassword"
        android:text="记住密码" />
    <CheckBox
        android:id="@+id/auto_login"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/rem_pw"
        android:layout_alignBottom="@+id/rem_pw"
        android:layout_marginLeft="16dp"
        android:layout_toRightOf="@+id/rem_pw"
        android:text="自动登录" />
    <Button
        android:id="@+id/btnLogin"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/etPassword"
        android:layout_below="@+id/auto_login"
        android:layout_marginRight="22dp"
        android:background="#FF72CAE1"
        android:text="@string/btnLogin" />
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/RelativeLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/a"
    android:orientation="vertical" >
    <TextView
        android:id="@+id/tvText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="15dp"
        android:text="@string/tvText"
        android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>