android 自动登录

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//主登录布局

<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"
    tools:context=".MainActivity" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:layout_marginTop="10dp"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="账号："
            android:textSize="22sp" />

        <EditText
            android:id="@+id/username"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="请输入用户名" />
    </LinearLayout>

    <View
        android:layout_width="fill_parent"
        android:layout_height="1dp"
        android:background="#0d0" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:layout_marginTop="10dp"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密码："
            android:textSize="22sp" />

        <EditText
            android:id="@+id/password"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="请输入密码"
            android:inputType="numberPassword"
            android:maxLines="11"
            android:password="true"
            android:scrollHorizontally="true" >

            <requestFocus />
        </EditText>
    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <CheckBox
            android:id="@+id/jizhumima"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:checked="true" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="记住密码"
            android:textSize="20sp" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <CheckBox
            android:id="@+id/jizhulogin"
            android:layout_width="50dp"
            android:layout_height="50dp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="自动登录"
            android:textSize="20sp" />
    </LinearLayout>

    <Button
        android:id="@+id/login"
        android:layout_width="120dp"
        android:layout_height="50dp"
        android:layout_gravity="center_horizontal"
        android:text="登录"
        android:textSize="30sp" />

</LinearLayout>

//正在登录布局

欢迎登录界面

*/主界面代码

package com.example.logindenglu;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

   private View view;
   private EditText inputpassword;
   private EditText inputusername;
   private CheckBox jzpw;
   private CheckBox jzl;
   private Button login;
   SharedPreferences sp;
   private String userNameValue;
   private String passwordValue;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       view = View.inflate(this, R.layout.activity_main, null);
       setContentView(view);
       inputpassword = (EditText) view.findViewById(R.id.password);
       inputusername = (EditText) view.findViewById(R.id.username);
       jzpw = (CheckBox) view.findViewById(R.id.jizhumima);
       jzl = (CheckBox) view.findViewById(R.id.jizhulogin);
       login = (Button) findViewById(R.id.login);
       sp = this.getSharedPreferences("userinfo", Context.MODE_WORLD_READABLE);
       // 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
           jzpw.setChecked(true);
           inputpassword.setText(sp.getString("USER_NAME", ""));
           inputusername.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
               jzl.setChecked(true);
               // 跳转界面
               Intent intent = new Intent(MainActivity.this,
                       LoginActivity.class);
               MainActivity.this.startActivity(intent);
           }
       }
       // 登录监听事件现在默认为用户名为：liu 密码：123
       login.setOnClickListener(new OnClickListener() {
           public void onClick(View v) {
               userNameValue = inputusername.getText().toString();
               passwordValue = inputpassword.getText().toString();
               if (userNameValue.equals("liu") && passwordValue.equals("123")) {
                   Toast.makeText(MainActivity.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 (jzpw.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(MainActivity.this,
                           LoginActivity.class);
                   MainActivity.this.startActivity(intent);
                   // finish();

               } else {
                   Toast.makeText(MainActivity.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
       jzpw.setOnCheckedChangeListener(new OnCheckedChangeListener() {
           @Override
           public void onCheckedChanged(CompoundButton buttonView,
                   boolean isChecked) {
               // TODO Auto-generated method stub
               if (jzpw.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
       jzl.setOnCheckedChangeListener(new OnCheckedChangeListener() {
           @Override
           public void onCheckedChanged(CompoundButton buttonView,
                   boolean isChecked) {
               // TODO Auto-generated method stub
               if (jzl.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();
               }
           }
       });
   }

}
*正在登录代码

package com.example.logindenglu;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;

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

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_login);
       progressBar = (ProgressBar) findViewById(R.id.pgBar);
       backButton = (Button) findViewById(R.id.btn_back);

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

       backButton.setOnClickListener(new OnClickListener() {

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

           }
       });
   }

}
//欢迎登录界面

package com.example.logindenglu;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class WelcomeActivity extends Activity {

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_welcome);
   }

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
       // Inflate the menu; this adds items to the action bar if it is present.
       getMenuInflater().inflate(R.menu.welcome, menu);
       return true;
   }

}

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