android客户端在多个界面切换时保持socket的链接的实例

鉴于自己的痛苦，研究一个socket在多个界面切换时保持链接的问题，令我纠结很久，现在我提供客户端的源码给有需要的人参考。

1、ApplicationUtil类：

import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.net.Socket;import java.net.UnknownHostException;import android.app.Application;public class ApplicationUtil extends Application{private Socket socket;private DataOutputStream out = null;private DataInputStream in = null;public void init() throws IOException, Exception{this.socket = new Socket("192.168.1.104",10202);this.out = new DataOutputStream(socket.getOutputStream());this.in = new DataInputStream(socket.getInputStream());}public Socket getSocket() {return socket;}public void setSocket(Socket socket) {this.socket = socket;}public DataOutputStream getOut() {return out;}public void setOut(DataOutputStream out) {this.out = out;}public DataInputStream getIn() {return in;}public void setIn(DataInputStream in) {this.in = in;}}

AndroidMainifest.xml中application的配置：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.login"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="10"        android:targetSdkVersion="15" />    <application        android:name="com.util.ApplicationUtil"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".LoginActivity"            android:label="@string/title_activity_main" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>      <activity android:name=".MainActivity"/>          </application>       <!-- 振动需要的权限 -->     <uses-permission android:name="android.permission.VIBRATE"/> <!-- 声明网络权限 --><uses-permission android:name="android.permission.INTERNET"/></manifest>

2、LoginActivity类：

import java.io.BufferedWriter;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.net.Socket;import java.net.UnknownHostException;import com.login.R;import com.util.ApplicationUtil;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class LoginActivity extends Activity{    private EditText usernameT;    private EditText passwordT;    private Button loginButton;    private Socket socket;    private DataOutputStream out;    private DataInputStream in;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.login);                usernameT = (EditText) findViewById(R.id.username);        passwordT = (EditText) findViewById(R.id.password);        loginButton = (Button) findViewById(R.id.login);                                loginButton.setOnClickListener(new OnClickListener(){            public void onClick(View v) {                                ApplicationUtil appUtil =  (ApplicationUtil) LoginActivity.this.getApplication();                try {                    appUtil.init();                    Socket socket = appUtil.getSocket();                    out = appUtil.getOut();                    in = appUtil.getIn();                                    } catch (IOException e1) {                    e1.printStackTrace();                } catch (Exception e1) {                    e1.printStackTrace();                }                                                String username = usernameT.getText().toString();                String password = passwordT.getText().toString();                MD5 md5 = new MD5();                String ss = md5.MD5(username+"|"+password);                    try {                    //发送数据                    String str = "[login]|"+ss;                    out.writeBytes(str);                    out.flush();                    System.out.println("str ===> "+str);                     //创建一个缓冲字节数                    int r = in.available();                      while(r==0){                       r = in.available();                      }                      byte[] b = new byte[r];                    in.read(b);                    String result = new String(b,"utf-8");                    System.out.println("result = "+result);                    if(result.equals("登陆成功0")){                        Intent intent = new Intent();                        intent.setClass(LoginActivity.this, MainActivity.class);                        startActivity(intent);                    }                    else                    {                        Intent intent = new Intent();                        intent.setClass(LoginActivity.this, MainActivity.class);                        startActivity(intent);                    }                            } catch (UnknownHostException e) {                    e.printStackTrace();                } catch (IOException e) {                    e.printStackTrace();                }            }        });            }}

3、MainActivity类：

import java.io.BufferedReader;import java.io.DataInputStream;import java.io.IOException;import java.io.InputStreamReader;import java.net.Socket;import com.image.TestActivity;import com.login.R;import com.util.ApplicationUtil;import android.media.RingtoneManager;import android.net.Uri;import android.os.Bundle;import android.os.Handler;import android.os.Looper;import android.os.Message;import android.provider.MediaStore.Audio;import android.app.Activity;import android.app.Notification;import android.app.NotificationManager;import android.app.PendingIntent;import android.content.Context;import android.content.Intent;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity {private EditText mess; private Socket socket;private Handler handler;private DataInputStream in; private NotificationManager nm;   private Notification n;   private int messageNotificationID = 0;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.success);        mess = (EditText) findViewById(R.id.message);                ApplicationUtil appUtil = (ApplicationUtil) MainActivity.this.getApplication();        socket = appUtil.getSocket();        in = appUtil.getIn();          handler = new Handler(){        @Overridepublic void handleMessage(Message msg) {//如果来自子线程if(msg.what == 0x123){mess.append(msg.obj.toString()+"\n");//消息通知mynoti();}}        };        //调用线程        myThread();     }    //JAVA可以设置读写缓冲区的大小-setReceiveBufferSize(int size), setSendBufferSize(int size)。    public void myThread(){    Thread oneThread = new Thread(new Runnable(){     public boolean isRunning = true;public void run() { while(isRunning){try {Thread.sleep(1000); //创建一个缓冲字节数int r = in.available();while(r==0){   r = in.available();  }byte[] b = new byte[r];in.read(b);String content = new String(b,"utf-8");//每当读到来自服务器的数据后，发送消息通知程序页面显示数据  Message msg = new Message();msg.what = 0x123;msg.obj = content;Log.v("ho", content);handler.sendMessage(msg);} catch (IOException e) {e.printStackTrace();} catch (InterruptedException e) {e.printStackTrace();} }}});oneThread.start();    }        public void mynoti(){     NotificationManager mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);        // 创建一个通知          Notification mNotification = new Notification();          //用系统自带的铃声        mNotification.sound = Uri.withAppendedPath(Audio.Media.INTERNAL_CONTENT_URI, "6");         // mNotification.sound = Uri.parse("file:///sdcard/wen.mp3");        //mNotification.defaults=Notification.DEFAULT_SOUND;                  //Notification.FLAG_INSISTENT;  //让声音、振动无限循环，直到用户响应        //Notification.FLAG_AUTO_CANCEL;    //通知被点击后，自动消失        //Notification.FLAG_NO_CLEAR;  //点击'Clear'时，不清楚该通知(QQ的通知无法清除，就是用的这个)        mNotification.flags = Notification.FLAG_NO_CLEAR; ;                      //通知时发出的振动              //第一个参数: 振动前等待的时间              //第二个参数： 第一次振动的时长、以此类推              long[] vir = {0,100,200,300};              mNotification.vibrate = vir;                  mNotificationManager.notify(messageNotificationID, mNotification);        messageNotificationID++;    }}

4、MD5类：

import java.security.MessageDigest;public class MD5 { // MD5加码。32位      public static String MD5(String inStr) {       MessageDigest md5 = null;       try {        md5 = MessageDigest.getInstance("MD5");       } catch (Exception e) {        System.out.println(e.toString());        e.printStackTrace();        return "";       }       char[] charArray = inStr.toCharArray();       byte[] byteArray = new byte[charArray.length];           for (int i = 0; i < charArray.length; i++)        byteArray[i] = (byte) charArray[i];           byte[] md5Bytes = md5.digest(byteArray);           StringBuffer hexValue = new StringBuffer();           for (int i = 0; i < md5Bytes.length; i++) {        int val = ((int) md5Bytes[i]) & 0xff;        if (val < 16)         hexValue.append("0");        hexValue.append(Integer.toHexString(val));       }           return hexValue.toString();      }     }

6、login.xml和success.xml

<?xml version="1.0" encoding="utf-8"?><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">           <TableLayout          android:layout_width="fill_parent"     android:layout_height="wrap_content"            >        <TableRow>            <TextView                 android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="账号："                />       <EditTextandroid:id="@+id/username"android:layout_width="200dp"android:layout_height="wrap_content"android:layout_marginLeft="10dp"    android:layout_marginTop="10dp"    android:layout_marginRight="10dp"    android:hint="账号"/>         </TableRow>          <TableRow>            <TextView                 android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="密码："                />        <EditTextandroid:id="@+id/password"android:password="true"android:layout_width="200dp"android:layout_height="wrap_content"android:layout_marginLeft="10dp"    android:layout_marginTop="10dp"    android:layout_marginRight="10dp"android:hint="密码"/>         </TableRow>                            </TableLayout>         <Buttonandroid:id="@+id/login"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_marginLeft="10dp"android:layout_marginTop="10dp"android:layout_marginRight="10dp"android:text="登录"/></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><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">        <TextView         android:id="@+id/success"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="不断接受信息，并提示"        />    <EditText         android:id="@+id/message"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:cursorVisible="false"        />    </LinearLayout>

以上都是客户端，服务端就自己写，socket代码差不多。

运行效果：