Android programming to implement simple UDP client instance _android

This article describes the Android programming implementation of simple UDP Client. Share to everyone for your reference, specific as follows:

The code is debugged inside the 4.2.2 through

1. Remember to add permission

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

Note: After Android 4.0, you can't communicate with the main thread, or you will throw an exception.

2. Code

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 ();
    Get button Object button Btnconnect = (button) Findviewbyid (R.id.buttonconnect);
        Btnconnect.setonclicklistener (New Button.onclicklistener () {public void OnClick (View v) {//) handling events here
        ConnectServer ();
        UdpClient Udpet = new UdpClient ("192.168.0.14", "123");
        Udpet.start ();
      Displaytoast ("click" \ "connect \" button);
    }
    }); Send button Btnconnect = (button) Findviewbyid (r.id.buttonsEnd);
        Btnconnect.setonclicklistener (New Button.onclicklistener () {public void OnClick (View v) {//) handling events here
      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 would//automatically handle clicks on the Home/up button, so long//As you specify a parent Activ
    ity in Androidmanifest.xml.
    int id = item.getitemid ();
    if (id = = r.id.action_settings) {return true;
  return super.onoptionsitemselected (item);
  /* Displays 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;
  The public class UdpClient extends thread{the 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_cont Ent "android:hint=" @string/text_ip "/> <button android:id=" @+id/buttonconnect "Android:layout_width=" M Atch_parent "android:layout_height=" wrap_content "android:text=" @string/text_connect "/> <EditText and
  Roid:id= "@+id/edittextfilepath" android:layout_width= "Match_parent"  android:layout_height= "Wrap_content" android:hint= "@string/text_filepath" > <requestfocus/> </Edi ttext> <button android:id= "@+id/buttonfilesel" android:layout_width= "Match_parent" Android:layout_heig ht= "Wrap_content" android:text= "@string/text_sel"/> <button android:id= "@+id/buttonsend" Android:layo Ut_width= "Match_parent" android:layout_height= "wrap_content" android:text= "@string/text_send"/> </LinearLay

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I hope this article will help you with the Android program.