Android编程实现简单的UDP Client实例
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2024-02-29 13:40:52
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
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>
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