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

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();    //獲得Button對象    Button btnConnect = (Button) findViewById(R.id.buttonConnect);    btnConnect.setOnClickListener(new Button.OnClickListener() {      public void onClick(View v)      {        //這里處理事件        //ConnectServer();        //UDPClient udpET = new UDPClient("192.168.0.14","123");        //udpET.start();        //DisplayToast("點擊了/"連接/"按鈕");      }    });    //發送Button    btnConnect = (Button) findViewById(R.id.buttonSend);    btnConnect.setOnClickListener(new Button.OnClickListener() {      public void onClick(View v)      {        //這里處理事件        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);  }  /* 顯示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();  }}

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();    }  }}

<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>