Android-Socket的最基础实现以及遇见在2.3可用4.3不可用的解决方法

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//服务器Service

import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;public class Test {public static void main(String[] args) {Thread socketservice=new Thread(new Socket00());socketservice.start();}}class Socket00 implements Runnable{@Overridepublic void run() {try {ServerSocket serverSocket=new ServerSocket(54321);while(true){System.out.println(11);Socket client=serverSocket.accept();//接受客户端请求BufferedReader in=new BufferedReader(new InputStreamReader(client.getInputStream()));String message1 = in.readLine();//读取一行数据/** 处理数据设为str*/String str="OK";//返回消息PrintWriter out=new PrintWriter(new BufferedWriter(new OutputStreamWriter(client.getOutputStream())),true);out.println(str);in.close();out.close();client.close();}} catch (IOException e) {e.printStackTrace();}}}

//客户端(布局就一个TextView 一个Button)

import java.io.*;import java.net.Socket;import net.testSocket.R;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;//客户端的实现public class TestSocket extends Activity {private TextView text1;private Button but1;private EditText edit1;    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                text1=(TextView)findViewById(R.id.text1);        but1=(Button)findViewById(R.id.but1);        edit1=(EditText)findViewById(R.id.edit);                but1.setOnClickListener(new alistener());            }         class alistener implements OnClickListener{@Overridepublic void onClick(View v) {Socket socket=null;String mesg=edit1.getText().toString()+"\r\n";edit1.setText("");try {socket=new Socket("192.168.1.102",54321);//同一局域网的ip地址和服务器的端口号//向服务器发送信息PrintWriter out=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);out.println(mesg);//接受服务器的信息BufferedReader br=new BufferedReader(new InputStreamReader(socket.getInputStream()));String mstr=br.readLine();System.out.println(mstr);out.close();br.close();socket.close();} catch(Exception e){System.out.println("ERROR");}}}}

//本人遇见过2.3可用,4.1不可用,解决如下:

android 4.0以上不能在主线程使用网络，因为会造成假死，需要创建一个线程去执行网络任务

即在客户端,按下按钮的监听里不要写执行方法,而是写一个多线程,**thread.start,在那里执行

在4.0中，使用Toast最好利用handler

//在AndroidManifest.xml加入<uses-permission android:name="android.permission.INTERNET" />

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