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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 {@Overrideprotected 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ButtonbtnConnect = (Button) findViewById(R.id.buttonSend);btnConnect.setOnClickListener(new Button.OnClickListener() {public void onClick(View v){//这里处理事件SendText();}});}@Overridepublic 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;}@Overridepublic 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);}/* 显示Toast */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 serverpublic void SendText() {TextView editIP=(TextView)findViewById(R.id.editTextIP);TextView editText=(TextView)findViewById(R.id.editTextFilePath);String message = editText.getText().toString() + "
"; 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;}@Overridepublic void run() {// TODO Auto-generated method stubint 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" ><EditTextandroid:id="@+id/editTextIP"android:layout_width="match_parent"android:layout_height="wrap_content"android:hint="@string/text_IP" /><Buttonandroid:id="@+id/buttonConnect"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="@string/text_connect" /><EditTextandroid:id="@+id/editTextFilePath"android:layout_width="match_parent"android:layout_height="wrap_content"android:hint="@string/text_filePath" ><requestFocus /></EditText><Buttonandroid:id="@+id/buttonFileSel"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="@string/text_sel" /><Buttonandroid:id="@+id/buttonSend"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="@string/text_send" /></LinearLayout>
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