本文实例讲述了Android编程实现TCP客户端的方法。分享给大家供大家参考，具体如下：
因为项目上需要实现一个TCP Client 端；在网上找好多例子基本上都是阻塞方式完成；
我的实现例子：由Activity 及sever 来实现，在sever 创建一个线程来监听接受数据。收到数据，通过广播发送给Activity;
服务端我没有去实现，你可以下载TCP Socket 调试工具v2.2；创建个9005端口；客户端：访问的IP为10.0.2.2
AnetTest.java：
/**
* Copyright 2010 archfree
*
*/
package com.archfree.demo;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class AnetTest extends Activity {
/**
* 通过ServiceConnection的内部类实现来连接Service和Activity
*
*/
public static final String TAG = "AnetTest";
private static final boolean DEBUG = true;// false
private String msg = "";
private UpdateReceiver mReceiver;
private Context mContext;
private ReceiveMessage mReceiveMessage;
// 实现一个 BroadcastReceiver，用于接收指定的 Broadcast
public class UpdateReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (DEBUG)
Log.d(TAG, "onReceive: " + intent);
msg = intent.getStringExtra("msg");
System.out.println("recv:" + msg);
// System.out.println();
((EditText) findViewById(R.id.tv_recv)).append(msg + "/n");
}
}
private ServiceConnection serviceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
mReceiveMessage = ((ReceiveMessage.LocalBinder) service)
.getService();
if (DEBUG)
Log.d(TAG, "on serivce connected");
}
@Override
public void onServiceDisconnected(ComponentName name) {
mReceiveMessage = null;
}
};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 实例化自定义的 BroadcastReceiver
mReceiver = new UpdateReceiver();
IntentFilter filter = new IntentFilter();
// 为 BroadcastReceiver 指定 action ，使之用于接收同 action 的广播
filter.addAction("com.archfree.demo.msg");
// 以编程方式注册 BroadcastReceiver 。配置方式注册 BroadcastReceiver 的例子见
// AndroidManifest.xml 文件
// 一般在 OnStart 时注册，在 OnStop 时取消注册
this.registerReceiver(mReceiver, filter);
mContext = AnetTest.this;
/**
* Button bn_conn bn_send bn_bind bn_unbind
*/
// Button bn_conn = (Button) findViewById(R.id.bn_conn);
Button bn_send = (Button) findViewById(R.id.bn_send);
Button bn_bind = (Button) findViewById(R.id.bn_bind);
Button bn_unbind = (Button) findViewById(R.id.bn_unbind);
EditText tv_recv = (EditText) findViewById(R.id.tv_recv);
/**
* EditText et_send
*/
EditText et_send = (EditText) findViewById(R.id.et_send);
/**
* bn_send on click
*/
bn_send.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// TODO
((EditText) findViewById(R.id.tv_recv)).clearComposingText();
mReceiveMessage
.SendMessageToServer("0001058512250000190010900005300010001354758032278512 460029807503542 0613408000011 ");
}
});
/**
* bn_bind on click
*/
bn_bind.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// TODO
Intent i = new Intent();
Bundle bundle = new Bundle();
bundle.putString("chatmessage",
((EditText) findViewById(R.id.et_send)).getText()
.toString());
i.putExtras(bundle);
System.out.println(" send onclick");
bindService(new Intent("com.archfree.demo.ReceiveMessage"),
serviceConnection, BIND_AUTO_CREATE);
}
});
/**
* bn_unbind on click
*/
bn_unbind.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// TODO
mContext.unbindService(serviceConnection);
}
});
/**
* Activity和本地服务交互,需要使用bind和unbind方法
* */
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
unbindService(serviceConnection);
unregisterReceiver(mReceiver);
}
}
ReceiveMessage.java 参考网络资源，修改；
package com.archfree.demo;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.SocketChannel;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
public class ReceiveMessage extends Service {
// @Override
// public int onStartCommand(Intent intent, int flags, int startId) {
// // TODO Auto-generated method stub
// return super.onStartCommand(intent, flags, startId);
// }
private SocketChannel client = null;
private InetSocketAddress isa = null;
private String message = "";
public void onCreate() {
System.out.println("----- onCreate---------");
super.onCreate();
ConnectToServer();
StartServerListener();
}
public void onDestroy() {
super.onDestroy();
DisConnectToServer();
}
public void onStart(Intent intent, int startId) {
System.out.println("----- onStart---------");
super.onStart(intent, startId);
}
/*
* IBinder方法 , LocalBinder 类,mBinder接口这三项用于
* Activity进行Service的绑定，点击发送消息按钮之后触发绑定 并通过Intent将Activity中的EditText的值
* 传送到Service中向服务器发送
*/
public IBinder onBind(Intent intent) {
System.out.println("----- onBind---------");
// message = intent.getStringExtra("chatmessage");
// if (message.length() > 0) {
// SendMessageToServer(message);
// }
return mBinder;
}
public class LocalBinder extends Binder {
ReceiveMessage getService() {
return ReceiveMessage.this;
}
}
private final IBinder mBinder = new LocalBinder();
// 用于链接服务器端
public void ConnectToServer() {
try {
client = SocketChannel.open();
//isa = new InetSocketAddress("10.0.2.2", 9005);
isa = new InetSocketAddress("211.141.230.246", 6666);
client.connect(isa);
client.configureBlocking(false);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// 断开与服务器端的链接
public void DisConnectToServer() {
try {
client.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// 启动服务器端的监听线程，从Server端接收消息
public void StartServerListener() {
ServerListener a = new ServerListener();
a.start();
}
// 向Server端发送消息
public void SendMessageToServer(String msg) {
System.out.println("Send:" + msg);
try {
ByteBuffer bytebuf = ByteBuffer.allocate(1024);
bytebuf = ByteBuffer.wrap(msg.getBytes("UTF-8"));
client.write(bytebuf);
bytebuf.flip();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println(" SendMessageToServer IOException===");
}
}
private void shownotification(String tab) {
System.out.println("shownotification=====" + tab);
NotificationManager barmanager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
Notification msg = new Notification(
android.R.drawable.stat_notify_chat, "A Message Coming!",
System.currentTimeMillis());
PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
new Intent(this, AnetTest.class), PendingIntent.FLAG_ONE_SHOT);
msg.setLatestEventInfo(this, "Message", "Message:" + tab, contentIntent);
barmanager.notify(0, msg);
}
// 发送广播信息
private void sendMsg(String msg){
// 指定广播目标的 action （注：指定了此 action 的 receiver 会接收此广播）
Intent intent = new Intent("com.archfree.demo.msg");
// 需要传递的参数
intent.putExtra("msg", msg);
// 发送广播
this.sendBroadcast(intent);
}
private class ServerListener extends Thread {
//private ByteBuffer buf = ByteBuffer.allocate(1024);
public void run() {
try {
// 无线循环，监听服务器,如果有不为空的信息送达，则更新Activity的UI
while (true) {
ByteBuffer buf = ByteBuffer.allocate(1024);
//buf.clear();
client.read(buf);
buf.flip();
Charset charset = Charset.forName("UTF-8");
CharsetDecoder decoder = charset.newDecoder();
CharBuffer charBuffer;
charBuffer = decoder.decode(buf);
String result = charBuffer.toString();
if (result.length() > 0)
{// recvData(result);
sendMsg(result);
//System.out.println("+++++="+result);
//shownotification(result);
}
// System.out.println("++++++++++++++++++="+result);
}
} catch (CharacterCodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.archfree.demo" android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".AnetTest" android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
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