android端按下拍照按键后向PC端发送一个自定义信息

刚刚接触android，想建立android与PC之间的TCP连接，android端按下拍照按键后向PC端发送一个自定义信息，但是程序安装到设备后根本不能连接到PC，请帮忙找找原因！

MacService.java：

package com.gzmacweb.macclient;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

import android.app.Service;
import android.content.Intent;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;

public class MacService extends Service {
private static final String TAG = "MacService";
PrintWriter out;

@Override
public void onCreate() {
// TODO
try{
    InetAddress serverAddr = InetAddress.getByName("192.168.10.168");//TCP服务器IP地址
        Log.d("TCP", "服务器：正在连接...");
      Socket socket = new Socket(serverAddr,747);
       String message = "你好！Android。";
       try { 
       Log.d("TCP", "服务器正在发送信息:'"+message+"'");
       PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);
                 out.println(message);
        } catch (Exception e) {
        Log.e("TCP", "服务器出错",e);
    }finally{
        socket.close();
    }
    }catch(Exception e){
       Log.e("TCP", "服务器出错",e);
  }
super.onCreate();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Bundle bundle=intent.getExtras();
if(bundle!=null&&bundle.containsKey("send")){//
out.println("kaca");
out.flush();
}
return super.onStartCommand(intent, flags, startId);
}

@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}

}

广播接收器MacBroadcastReceiver.java：
package com.gzmacweb.macclient;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class MacBroadcastReceiver extends BroadcastReceiver {
private static final String ACTION_CAPTURE = "com.hikvision.keyevent.CAPTURE";
private static final String ACTION_BOOT = Intent.ACTION_BOOT_COMPLETED;

@Override
public void onReceive(Context context, Intent intent) {

  String action = intent.getAction();
if (action == null)
return;
if (action.equals(ACTION_CAPTURE)) {
Intent service = new Intent(context, MacService.class);
service.putExtra("send", true);
context.startService(service);
} else if (action.equals(ACTION_BOOT)) {
Intent service = new Intent(context, MacService.class);
context.startService(service);
}

}

}

manifest：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.gzmacweb.macclient"
    android:versionCode="1"
    android:versionName="1.0" >
   
    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="21" />

    <uses-permission android:name="android.permission.INTERNET" >
    </uses-permission>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher" >

        <!-- 注册自定义静态广播接收器 -->
        <receiver android:name=".MacBroadcastReceiver">
            <intent-filter>
                <action android:name="com.hikvision.keyevent.CAPTURE" />
                <action android:name="android.intent.action.BOOT_COMPLETED" />

            </intent-filter>
        </receiver>

        <service android:name=".MacService" >
        </service>
    </application>

</manifest>

就把TCP那部分代码在android上当做java来处理就可以了。 。那个finally我没看明白什么意思， 发一条消息socket就关掉？

     
/* 连接服务器 */ 
socket = new Socket(SERVER_HOST_IP, SERVER_HOST_PORT); 
 /* 获取输出流 */ 
output = new PrintStream(socket.getOutputStream(), true, "utf-8");
output.print(msg); 

还有在AndroidManifest.xml中添加访问网络权限：
<uses-permission android:name="android.permission.INTERNET" />

还有一点，你是在oncreate()中实现socket的，而oncreate()不是每次都调用，最好在onStartCommand()中实现。