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。