基于IntentService的Android登录完整示例

本文主要是介绍基于IntentService的Android登录完整示例，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1.后台使用简单的servlet，支持GET或POST。这个servlet最终返回给前台一个字符串flag，值是true或false，表示登录是否成功。

/**
* Copyright(C) 2014
*
* 模块名称：     
* 子模块名称：   
*
* 备注：
*
* 修改历史：
* 2014-1-26	1.0		liwei5946@gmail.com		新建
*/
package cn.edu.hbcit.minicms.controller;import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.log4j.Logger;import cn.edu.hbcit.minicms.dao.Login;
import cn.edu.hbcit.minicms.util.PasswordEncodeBean;/*** 登录控制类* 简要说明:* @author liwei5946@gmail.com* @version 1.00  2014-1-26下午07:21:13	新建*/public class LoginServlet extends HttpServlet {protected final static Logger log = Logger.getLogger(LoginServlet.class.getName());/*** Constructor of the object.*/public LoginServlet() {super();}/*** Destruction of the servlet. <br>*/public void destroy() {super.destroy(); // Just puts "destroy" string in log// Put your code here}/*** The doGet method of the servlet. <br>*/public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}/*** The doPost method of the servlet. <br>** This method is called when a form has its tag value method equals to post.* * @param request the request send by the client to the server* @param response the response send by the server to the client* @throws ServletException if an error occurred* @throws IOException if an error occurred*/public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");PrintWriter out = response.getWriter();Boolean flag = false;Login login = new Login();PasswordEncodeBean encode = new PasswordEncodeBean();String userName = request.getParameter("un");String password = request.getParameter("pw");flag = login.login(userName, encode.MD5Encode(password));log.debug("登录结果是：" + flag);out.print(flag);out.flush();out.close();}/*** Initialization of the servlet. <br>** @throws ServletException if an error occurs*/public void init() throws ServletException {// Put your code here}}

2.在ADT中新建一个android工程，建立两个Activity，分别作为登录界面和登录成功界面。

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: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" ><TextViewandroid:id="@+id/mainContent"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="TextView" /><EditTextandroid:id="@+id/userName"android:layout_width="match_parent"android:layout_height="wrap_content"android:ems="10" android:inputType="text" />"<EditTextandroid:id="@+id/password"android:layout_width="match_parent"android:layout_height="wrap_content"android:ems="10"android:inputType="textPassword" /><Buttonandroid:id="@+id/myButton"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="Submit" /></LinearLayout>

activity_result.xml

<RelativeLayout 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: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=".ResultActivity" ><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/hello_world" /></RelativeLayout>

3.HTTP的访问公共类，用于处理GET和POST请求

package edu.hbcit.testandroid.util;import java.util.ArrayList;
import java.util.List;
import java.util.Map;import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;import android.util.Log;public class HttpUtil
{// 创建HttpClient对象public static HttpClient httpClient = new DefaultHttpClient();public static final String BASE_URL = "http://192.168.1.101:8080/server/"; //注意不要用127.0.0.1/*** * @param url 发送请求的URL* @return 服务器响应字符串* @throws Exception*/public static String getRequest(String url)throws Exception{// 创建HttpGet对象。HttpGet get = new HttpGet(url);// 发送GET请求HttpResponse httpResponse = httpClient.execute(get);// 如果服务器成功地返回响应if (httpResponse.getStatusLine().getStatusCode() == 200){// 获取服务器响应字符串String result = EntityUtils.toString(httpResponse.getEntity());return result;}else{Log.d("服务器响应代码", (new Integer(httpResponse.getStatusLine().getStatusCode())).toString());return null;}}/*** * @param url 发送请求的URL* @param params 请求参数* @return 服务器响应字符串* @throws Exception*/public static String postRequest(String url, Map<String ,String> rawParams)throws Exception{// 创建HttpPost对象。HttpPost post = new HttpPost(url);// 如果传递参数个数比较多的话可以对传递的参数进行封装List<NameValuePair> params = new ArrayList<NameValuePair>();for(String key : rawParams.keySet()){//封装请求参数params.add(new BasicNameValuePair(key , rawParams.get(key)));}// 设置请求参数post.setEntity(new UrlEncodedFormEntity(params, "gbk"));// 发送POST请求HttpResponse httpResponse = httpClient.execute(post);// 如果服务器成功地返回响应if (httpResponse.getStatusLine().getStatusCode() == 200){// 获取服务器响应字符串String result = EntityUtils.toString(httpResponse.getEntity());return result;}return null;}
}

4.IntentService服务，用于在后台以队列方式处理耗时操作。

package edu.hbcit.testandroid.service;import java.util.HashMap;import edu.hbcit.testandroid.util.HttpUtil;
import android.app.IntentService;
import android.content.Intent;
import android.util.Log;public class ConnectService extends IntentService {private static final String ACTION_RECV_MSG = "edu.hbcit.testandroid.intent.action.RECEIVE_MESSAGE";public ConnectService() {super("TestIntentService");// TODO Auto-generated constructor stub}@Overrideprotected void onHandleIntent(Intent intent) {// TODO Auto-generated method stub/*** 经测试，IntentService里面是可以进行耗时的操作的 * IntentService使用队列的方式将请求的Intent加入队列，* 然后开启一个worker thread(线程)来处理队列中的Intent  * 对于异步的startService请求，IntentService会处理完成一个之后再处理第二个  */Boolean flag = false;//通过intent获取主线程传来的用户名和密码字符串String username = intent.getStringExtra("username");String password = intent.getStringExtra("password");flag = doLogin(username, password);Log.d("登录结果", flag.toString());Intent broadcastIntent = new Intent();broadcastIntent.setAction(ACTION_RECV_MSG);  broadcastIntent.addCategory(Intent.CATEGORY_DEFAULT);  broadcastIntent.putExtra("result", flag.toString());sendBroadcast(broadcastIntent);}// 定义发送请求的方法private Boolean doLogin(String username, String password){String strFlag = "";// 使用Map封装请求参数HashMap<String, String> map = new HashMap<String, String>();map.put("un", username);map.put("pw", password);// 定义发送请求的URL
// 		String url = HttpUtil.BASE_URL + "LoginServlet?un=" + username + "&pw=" + password;  //GET方式String url = HttpUtil.BASE_URL + "LoginServlet"; //POST方式Log.d("url", url);Log.d("username", username);Log.d("password", password);try {// 发送请求strFlag = HttpUtil.postRequest(url, map);  //POST方式
// 			strFlag = HttpUtil.getRequest(url);  //GET方式Log.d("服务器返回值", strFlag);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}if(strFlag.trim().equals("true")){return true;}else{return false;}}}

5.在AndroidManifest.xml中注册IntentService。注意uses-permission节点，为程序开启访问网络的权限。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="edu.hbcit.testandroid"android:versionCode="1"android:versionName="1.0" ><uses-sdkandroid:minSdkVersion="9"android:targetSdkVersion="14" /><uses-permission android:name="android.permission.INTERNET"/><applicationandroid:allowBackup="true"android:icon="@drawable/ic_launcher"android:label="@string/app_name"android:theme="@style/AppTheme" ><activityandroid:name="edu.hbcit.testandroid.activity.MainActivity"android:label="@string/app_name" ><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><activityandroid:name="edu.hbcit.testandroid.activity.ResultActivity"android:label="@string/title_activity_result" ></activity><service android:name="edu.hbcit.testandroid.service.ConnectService"></service></application></manifest>

6.重头戏Activity登场——需要注意的几个要点

1. 按钮监听事件中，使用Intent将要传递的值传给service。有点类似于Java Web中的session。
   
2. 接收广播类中，同样使用Intent将要传递的值传给下一个Activity。
3. 在onCreate()中，动态注册接收广播类的实例receiver。
4. 在接收广播类中，不要使用完毕后忘记注销接收器，否则会报一个Are you missing a call to unregisterReceiver()? 的异常。
   

package edu.hbcit.testandroid.activity;import java.util.HashMap;import edu.hbcit.testandroid.R;
import edu.hbcit.testandroid.R.id;
import edu.hbcit.testandroid.R.layout;
import edu.hbcit.testandroid.R.menu;
import edu.hbcit.testandroid.service.ConnectService;
import edu.hbcit.testandroid.util.DialogUtil;
import edu.hbcit.testandroid.util.HttpUtil;
import android.os.Bundle;
import android.os.StrictMode;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;public class MainActivity extends Activity {private static final String ACTION_RECV_MSG = "edu.hbcit.testandroid.intent.action.RECEIVE_MESSAGE";private MessageReceiver receiver ;EditText et_username ;EditText et_password;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//获取文本viewTextView tv = (TextView)findViewById(R.id.mainContent);//获取输入框et_username = (EditText)findViewById(R.id.userName);et_password = (EditText)findViewById(R.id.password);//获取按钮Button submit = (Button)findViewById(R.id.myButton);tv.setText("这是Hello World登录示例");//http://192.168.1.101:8080/server/LoginServlet?un=aaa&pw=123456//为按钮绑定事件监听器submit.setOnClickListener(new OnClickListener(){public void onClick(View v){if (validate()){// 如果登录成功Intent msgIntent = new Intent(MainActivity.this, ConnectService.class);msgIntent.putExtra("username", et_username.getText().toString().trim());msgIntent.putExtra("password", et_password.getText().toString().trim());startService(msgIntent);}}});//动态注册receiver  IntentFilter filter = new IntentFilter(ACTION_RECV_MSG);  filter.addCategory(Intent.CATEGORY_DEFAULT);  receiver = new MessageReceiver();  registerReceiver(receiver, filter);  }// 对用户输入的用户名、密码进行校验private boolean validate(){String username = et_username.getText().toString().trim();if (username.equals("")){DialogUtil.showDialog(this, "用户名是必填项！", false);return false;}String pwd = et_password.getText().toString().trim();if (pwd.equals("")){DialogUtil.showDialog(this, "密码是必填项！", false);return false;}return true;}//接收广播类  public class MessageReceiver extends BroadcastReceiver {  @Override  public void onReceive(Context context, Intent intent) {  String message = intent.getStringExtra("result");  Log.d("MessageReceiver", message);// 如果登录成功if (message.equals("true")){// 启动Main ActivityIntent nextIntent = new Intent(MainActivity.this, ResultActivity.class);startActivity(nextIntent);// 结束该Activityfinish();//注销广播接收器context.unregisterReceiver(this);}else{DialogUtil.showDialog(MainActivity.this, "用户名称或者密码错误，请重新输入！", false);}}  }  }

运行效果：

1.登录界面

2.登录失败界面

3.登录成功界面

小李专栏原创文章，转自需注明出处【http://blog.csdn.net/softwave】。

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