Android 是一种基于 Linux 的自由及开放源代码的操作系统,主要使用于移动设备,如智能手机和平板电脑,由 Google 公司和开放手机联盟领导及开发。尚未有统一中文名称,中国大陆地区较多人使用 "安卓" 或 "安致"。
这篇文章主要为大家详细介绍了 android Socket 实现简单聊天小程序,具有一定的参考价值,感兴趣的小伙伴们可以参考一下
服务器端:
- package org.hwq.echo;
- import java.io.BufferedReader;
- import java.io.IOException;
- import java.io.InputStreamReader;
- import java.io.PrintWriter;
- import java.net.ServerSocket;
- import java.net.Socket;
- public class TalkServer {
- public static void main(String[] args) throws IOException {
- ServerSocket server = null;
- Socket client = null;
- BufferedReader in =null;
- PrintWriter out = null;
- try {
- server = new ServerSocket(4700);
- client = server.accept();
- out = new PrintWriter(client.getOutputStream()); in =new BufferedReader(new InputStreamReader(client.getInputStream()));
- String line = in.readLine();
- while (!"bye".equals(line)) {
- System.out.println("client:" + line);
- out.println("echo:" + line);
- out.flush();
- line = in.readLine();
- }
- } catch(Exception e) {
- e.printStackTrace();
- if (client != null) client.close();
- if (server != null) server.close();
- }
- }
- }
手机端:
- package org.hwq.cho;
- import java.io.BufferedReader;
- import java.io.IOException;
- import java.io.InputStreamReader;
- import java.io.PrintWriter;
- import java.net.Socket;
- import java.net.UnknownHostException;
- import android.app.Activity;
- import android.content.Context;
- import android.os.Bundle;
- import android.os.Handler;
- import android.os.Message;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.Button;
- import android.widget.EditText;
- import android.widget.Toast;
- public class EchoActivity extends Activity implements OnClickListener {
- EditText show,
- msg;
- Button send;
- Handler handler;
- Socket client;
- /** Called when the activity is first created. */
- @Override public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- handler = new MyHandler();
- show = (EditText) findViewById(R.id.show);
- msg = (EditText) findViewById(R.id.msg);
- send = (Button) findViewById(R.id.send);
- send.setOnClickListener(this);
- }@Override public void onClick(View arg0) {
- String message = msg.getText().toString();
- // System.out.println("msg:"+message);
- new EchoThread(EchoActivity.this, message).start();
- }
- public class MyHandler extends Handler {@Override public void handleMessage(Message msg) {
- switch (msg.what) {
- case 1:
- Toast.makeText(EchoActivity.this, "建立连接失败", 0).show();
- break;
- case 2:
- String message = (String) msg.obj;
- System.out.println("Handler:" + message);
- show.append("\n" + message);
- break;
- }
- }
- }
- private class EchoThread extends Thread {
- private Context context;
- private String msg;
- EchoThread(Context context, String msg) {
- this.context = context;
- this.msg = msg;
- }
- public void run() {
- if (client == null) {
- try {
- client = new Socket("192.168.1.102", 4700);
- } catch(IOException e) {
- Message message = new Message();
- message.what = 1;
- handler.sendMessage(message);
- }
- }
- System.out.println("建立连接");
- try {
- BufferedReader in ;
- BufferedReader input;
- PrintWriter out; in =new BufferedReader(new InputStreamReader(client.getInputStream()));
- out = new PrintWriter(client.getOutputStream());
- String line = msg;
- if (!"bye".equals(line)) {
- System.out.println("line:" + line);
- out.println(line);
- out.flush();
- String echo = in.readLine();
- System.out.println("server:" + echo);
- Message message = new Message();
- message.obj = echo;
- message.what = 2;
- handler.sendMessage(message);
- }
- } catch(Exception e) {
- }
- }
- }
- }
注意几点:
1、添加网络权限
<uses-permission android:name="android.permission.INTERNET"/>
如果没添加,无法使用 socket 连接网络。
2、在新启线程中不要使用 android 系统 UI 界面
在 EchoThrad 的 run() 方法里面,有下面代码:
- if (client == null) {
- try {
- client = new Socket("192.168.1.102", 4700);
- } catch(IOException e) {
- Message message = new Message();
- message.what = 1;
- handler.sendMessage(message);
- }
- }
这里的 handler.sendMessage(message); 是发送一个消息给 handler, 然后 handler 根据消息弹出一个 Toast 显示连接失败。如果这里直接使用
Toast.makeText(EchoActivity.this," 建立连接失败 ", 0).show();
会报如下错:
Can't create handler inside thread that has not called Looper.prepare()
来源: http://www.phperz.com/article/17/0822/337514.html