本文实例讲述了Android编程实现简单的UDP Client。分享给大家供大家参考，具体如下：

该代码在4.2.2内调试通过

1.记得加权限

<uses-permission android:name="android.permission.INTERNET"/>

注意：Android 4.0之后，就不能在主线程进行socket通信，否则会抛异常。

2.代码

MainActivity.java：

package mao.example.quicksend;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.os.Handler;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;import android.view.View;public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); InitUI(); //获得Button对象 Button btnConnect = (Button) findViewById(R.id.buttonConnect); btnConnect.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { //这里处理事件 //ConnectServer(); //UDPClient udpET = new UDPClient("192.168.0.14","123"); //udpET.start(); //DisplayToast("点击了\"连接\"按钮"); } }); //发送Button btnConnect = (Button) findViewById(R.id.buttonSend); btnConnect.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { //这里处理事件 SendText(); } }); } @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; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } public void DisplayToast(String str) { Toast.makeText(this, str, Toast.LENGTH_SHORT).show(); } public void InitUI() { TextView text=(TextView)findViewById(R.id.editTextIP); text.setText("192.168.0.14"); text = (TextView)findViewById(R.id.editTextFilePath); text.setText("Udp Client Send Test"); } // connect server public void SendText() { TextView editIP=(TextView)findViewById(R.id.editTextIP); TextView editText=(TextView)findViewById(R.id.editTextFilePath); String message = editText.getText().toString() + "\r\n"; UDPClient udpET = new UDPClient(editIP.getText().toString(), message); udpET.start(); }}

UDPClient.java：

package mao.example.quicksend;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.net.SocketException;import java.lang.String;public class UDPClient extends Thread{ public String m_serverIP; public String m_text; public UDPClient(String strServerIP, String strText) { m_serverIP = strServerIP; m_text = strText; } @Override public void run() { // TODO Auto-generated method stub int TIMEOUT = 3000; int servPort = 8800; byte[] bytesToSend = m_text.getBytes();//"test_client".getBytes(); try { InetAddress serverAddress = InetAddress.getByName(m_serverIP); DatagramSocket socket = new DatagramSocket(); socket.setSoTimeout(TIMEOUT); DatagramPacket sendPacket = new DatagramPacket(bytesToSend,bytesToSend.length,serverAddress,servPort); socket.send(sendPacket); socket.close(); } catch (SocketException e){ e.printStackTrace(); }catch(IOException e){ e.printStackTrace(); } }}

3. activity_main.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/LinearLayout1" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="mao.example.quicksend.MainActivity" > <EditText android:id="@+id/editTextIP" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="@string/text_IP" /> <Button android:id="@+id/buttonConnect" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/text_connect" /> <EditText android:id="@+id/editTextFilePath" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="@string/text_filePath" > <requestFocus /> </EditText> <Button android:id="@+id/buttonFileSel" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/text_sel" /> <Button android:id="@+id/buttonSend" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/text_send" /></LinearLayout>

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