android socket 编程
一、需要注意的地方：
1.需要添加网络权限：<uses-permission android:name="android.permission.INTERNET" />；
2.android4.0平台默认不允许在主线程中进行网络访问，所以要新建thread来运行socket读写的程序；
二、tcp socket 通讯示例
package test.dxp.sockets;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.net.UnknownHostException;
import test.dxp.sockets.R;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Socket_testActivity extends Activity implements OnClickListener{
private String TAG = "TEST_SOCKET";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btnStartDec = (Button)findViewById(R.id.startDec);
Button btnStopDec = (Button)findViewById(R.id.stopDec);
btnStartDec.setOnClickListener(this);
btnStopDec.setOnClickListener(this);
}
private int startDec()
{
Log.d(TAG,"startDec");
service_start();
client_start();
return 0;
}
private int stopDec()
{
Log.d(TAG,"stopDec");
service_stop();
client_stop();
return 0;
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.startDec:
startDec();
break;
case R.id.stopDec:
stopDec();
break;
default:
break;
}
}
ServerSocket sever;
private void service_start()
{
int port = 12345;
Log.d(TAG,"service start 1");
try {
//创建一个ServerSocket对象，并让这个Socket在4567端口监听
sever = new ServerSocket(port);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.d(TAG,"service start 2");
beginListen();
Log.d(TAG,"service start 3");
}
private void service_stop() {
Log.d(TAG,"service stop 1");
try{
sever.close();
}catch(IOException e){
e.printStackTrace();
}
Log.d(TAG,"service stop 2");
}
Socket socket;
public void beginListen(){
Log.d(TAG,"service listen 1");
new Thread(new Runnable(){
public void run(){
BufferedReader in;
try{
socket = sever.accept();
}catch(SocketException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
Log.d(TAG,"service listen 2");
try{
in = new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF-8"));
PrintWriter out = new PrintWriter(socket.getOutputStream());
while (!socket.isClosed()){
String str;
str = in.readLine();
System.out.println("socket service:");
out.println("hello! " + str);
out.flush();
if (str == null || str.equals("end"))
break;
System.out.println(str);
}
socket.close();
}catch(IOException e){
e.printStackTrace();
}
}
}
).start();
}
static Socket client;
private void client_start()
{
new Thread(new Runnable(){
public void run(){
try{
client = new Socket("127.0.0.1",12345);
}catch (UnknownHostException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
System.out.println("socket client:");
System.out.println(sendMsg("nimei1111"));
}
}
).start();
}
private void client_stop() {
try{
client.close();
}catch(IOException e){
e.printStackTrace();
}
}
public String sendMsg(String msg){
try{
BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
PrintWriter out = new PrintWriter(client.getOutputStream());
out.println(msg);
out.flush();
return in.readLine();
}catch(IOException e){
e.printStackTrace();
}
return "";
}
}