android学习日记——基于UDP的聊天demo

来源：互联网发布：office for mac 2016 编辑：程序博客网时间：2024/06/05 10:35

布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.ytdb.demo.MainActivity">    <EditText        android:id="@+id/edit_ip"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:hint="IP地址" />    <EditText        android:id="@+id/edit_port"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:hint="端口号"        android:text="1026" />    <TextView        android:id="@+id/text_chat"        android:layout_width="wrap_content"        android:layout_height="0dp"        android:layout_weight="7"        android:textSize="20sp" />    <LinearLayout        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:orientation="horizontal">        <EditText            android:id="@+id/edit_content"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="5"            android:hint="请输入文字" />        <Button            android:id="@+id/bt_send"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="2"            android:text="发送" />    </LinearLayout></LinearLayout>

java文件

package com.ytdb.demo;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.text.TextUtils;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;public class MainActivity extends Activity implements View.OnClickListener {    private TextView text_chat;    private EditText edit_ip;    private EditText edit_port;    private EditText edit_content;    private Button bt_send;    private StringBuffer sb = new StringBuffer();  //缓存收到的数据    private String address;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        edit_ip = (EditText) findViewById(R.id.edit_ip);        edit_port = (EditText) findViewById(R.id.edit_port);        edit_content = (EditText) findViewById(R.id.edit_content);        text_chat = (TextView) findViewById(R.id.text_chat);        bt_send = (Button) findViewById(R.id.bt_send);        reciveData();        bt_send.setOnClickListener(this);        new Thread(new Runnable() {            @Override            public void run() {//开启一个线程判断是否有用户输入                while (true) {                    String con = edit_content.getText().toString().trim();                    Message msg = Message.obtain();                    if (!TextUtils.isEmpty(con)) {                        msg.what = 0x111;                        handler_input.sendMessage(msg);                    } else {                        msg.what = 0x222;                        handler_input.sendMessage(msg);                    }                }            }        }).start();    }    public void reciveData() {        new Thread(new Runnable() {            @Override            public void run() {                try {                    byte buff[] = new byte[8192];  //存放接收到的数据最大容量8MB                    DatagramSocket socket = new DatagramSocket(1026); //监听port接收客户端数据（自己指定）                    DatagramPacket packet = new DatagramPacket(buff, buff.length);                    while (true) {                        socket.receive(packet); //接收客户端的数据报                        String con = new String(packet.getData());                        if (!TextUtils.isEmpty(con)) {                            address = packet.getAddress().toString();                            Message msg = Message.obtain();                            msg.obj = con;                            handler.sendMessage(msg);     //发送从远程客户端接收的数据到消息队列                        }                    }                } catch (Exception e) {                    e.printStackTrace();                }            }        }).start();    }    @Override    public void onClick(View v) {        final String ip = edit_ip.getText().toString().trim();     //获取用户的输入的ip地址        final String port = edit_port.getText().toString().trim();  //获取用户的输入的端口号        final String content = edit_content.getText().toString().trim();//获取用户的发送内容        if (!TextUtils.isEmpty(ip) && !TextUtils.isEmpty(port)) {            new Thread(new Runnable() {                @Override                public void run() {                    try {                        Integer p = Integer.parseInt(port);                        InetAddress inetAddress = InetAddress.getByName(ip);                        DatagramPacket packet = new DatagramPacket(content.getBytes(), content.getBytes().length, inetAddress, p);                        DatagramSocket socket = new DatagramSocket();                        socket.send(packet);  //发送数据报                        sb.append("本机-->" + content + "\n");  //本机发送的消息                    } catch (Exception e) {                        e.printStackTrace();                    }                }            }).start();        } else            Toast.makeText(this, "ip地址或port不能为空", Toast.LENGTH_LONG).show();        edit_content.setText(""); //清空发送消息的编辑框    }    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            String con = (String) msg.obj;            sb.append(address+ "-->" + con + "\n");            text_chat.setText(sb);        }    };    private Handler handler_input = new Handler() {        @Override        public void handleMessage(Message msg) {         //根据接收的消息判断是否获取按钮焦点            if (msg.what == 0x111) {                bt_send.setEnabled(true);            } else if (msg.what == 0x222) {                bt_send.setEnabled(false);            }        }    };}

最后记住加上网络权限<uses-permission android:name="android.permission.INTERNET"></uses-permission>

注：此demo只能实现纯文本的聊天对话功能，能在内网下使用（亲测），公网上应该需要一个固定ip,目前没试过。

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