【Android學習筆記】Android作為用戶端與Linux伺服器端通過Socket連接配接

      之前查找過很多網上的例子，直接new一個socket對象，傳ip值和端口号進去，發現在手機上運作之後，都是不行的，會出現android.os.NetworkOnMainThreadException 異常錯誤，弄了幾天，終于發現隻有通過異步線程的方法才測試出一個可以運作的代碼。此程式是可以掃描伺服器開放的端口，再連接配接，我這裡是開放了60000端口，測試時連接配接60000的端口。需要伺服器和用戶端都連在同一個區域網路上。我的ip位址是192.168.2.106，本例子是查找哪個端口開放，有句socket.close()被我注釋掉了，可保證伺服器與用戶端一直通信。

Linux伺服器端：編譯通過之後執行，這裡為友善測試，用戶端發送什麼資料，伺服器便收到傳回同樣資料

#include "./Server.cc"

int main()
{
	Server server;

	while (true)
   	{
        	server.setPort(60000);
        	std::cout << "start connect...\n";
        	Server new_sock;
        	std::string pattern = ",";

        	//get client connect and accept it.
        	server.accept(new_sock);

        	while (true)
        	{
            		std::string ack = "";
            		std::string recv;
            		new_sock >> recv;
            
			if (recv=="")
            		{
                		server.close();
                		break;
            		}
            	
			//std::cout << "\nWe recv the message from client : " << recv << std::endl;
			new_sock << recv;
		}
	}
}
           

手機用戶端：

package com.example.kam_socket3;

import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
	private TextView tvPorts;
	private Button starScanBtn;
	private Handler handler = new Handler(){
	@Override
	public void handleMessage(Message msg){
		//将已經打開的端口号顯示在TextView控件上
		tvPorts.append(String.valueOf(msg.what) + ":OK\n");
		super.handleMessage(msg);
	}
	};
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		tvPorts = (TextView) findViewById(R.id.tvPorts);
		starScanBtn = (Button)findViewById(R.id.starScanBtn);  
		starScanBtn.setOnClickListener(new OnClickListener() {  
            @Override  
            public void onClick(View arg0) {  
                // TODO Auto-generated method stub  
                Thread thread = new Thread(new ConnetPort("192.168.2.106",60000));  
                thread.start();  
                Toast.makeText(MainActivity.this, "開始掃描", Toast.LENGTH_LONG).show();  
            }  
        });  
	}
	
	class ConnetPort extends Thread{
		private int conPort;
		private String ipAddress;
		public ConnetPort(String ipAddress,int conPort){
			this.conPort = conPort;
			this.ipAddress = ipAddress;
		}
		
		@Override
		public void run(){
				try{
					Socket socket = new Socket();
					SocketAddress socketAddress = new InetSocketAddress(ipAddress,conPort);
					socket.connect(socketAddress,50);
					handler.sendEmptyMessage(conPort);
//					socket.close();
				}
				catch(Exception e){
					
				}
			handler.post(new Runnable(){
				@Override
				public void run(){
					Toast.makeText(MainActivity.this, "掃描完成", Toast.LENGTH_LONG).show();
				}
			});
		}
	}

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

}
           

AndroidManifest：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.kam_socket3"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.kam_socket3.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>
    </application>
<uses-permission android:name="android.permission.INTERNET" />
</manifest>
           

注意，一定要在系統資料庫上加上<uses-permission android:name="android.permission.INTERNET" />這句添加通路網絡權限，否則連接配接不上。

 異步線程方法如:（簡單說下）

new Thread(){
@Override
public void run(){
//你要執行的方法
//執行完畢後給handler發送一個空消息
handler.sendEmptyMessage(0);
}
}.start();

 

//定義Handler對象
private Handler handler =new Handler(){
@Override
//當有消息發送出來的時候就執行Handler的這個方法
public void handleMessage(Message msg){
super.handleMessage(msg);
//處理UI
}
};