Android可记住用户密码登陆界面

来源：互联网发布：org.apache.http.nio 编辑：程序博客网时间：2024/05/23 15:53

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()) {

                    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>

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