这里有新鲜出炉的精品教程,程序狗速度看过来!
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”。
这篇文章主要介绍了Android编程实现简单的UDP Client,结合实例形式分析了Android实现UDP Clinet客户端的实现技巧,需要的朋友可以参考下
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);
- }
- /* 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 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>
希望本文所述对大家Android程序设计有所帮助。
来源: http://www.phperz.com/article/17/0915/348753.html