From cca3b3e04739cf5d5973b3eac2cc9105efefed72 Mon Sep 17 00:00:00 2001
From: Eugene Crosser <crosser@average.org>
Date: Mon, 9 Aug 2010 01:16:12 +0400
Subject: [PATCH] use datagram sockets

---
 AndroidManifest.xml                           |  3 +
 res/layout/main.xml                           | 20 ++++-
 .../udpresponder/UdpRespondActivity.java      | 73 +++++++++++++++----
 3 files changed, 77 insertions(+), 19 deletions(-)

diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 3abecda..09d64d1 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -3,6 +3,7 @@
       package="com.example.udpresponder"
       android:versionCode="1"
       android:versionName="1.0">
+    <uses-permission android:name="android.permission.INTERNET" />
     <application android:label="@string/app_name" android:icon="@drawable/icon">
         <activity android:name="UdpRespondActivity"
                   android:label="@string/app_name">
@@ -11,5 +12,7 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+	<service android:name="UdpRespondService">
+	</service>
     </application>
 </manifest> 
diff --git a/res/layout/main.xml b/res/layout/main.xml
index 9caf5f6..1abab34 100644
--- a/res/layout/main.xml
+++ b/res/layout/main.xml
@@ -1,23 +1,35 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:orientation="vertical"
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     >
 <Button android:id="@+id/btn_stop"
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
+    android:layout_alignParentTop="true"
+    android:layout_alignParentRight="true"
     android:text="Stop"
     />
 <Button android:id="@+id/btn_start"
     android:layout_width="wrap_content" 
-    android:layout_height="wrap_content" 
+    android:layout_height="wrap_content"
+    android:layout_alignParentTop="true"
+    android:layout_toLeftOf="@id/btn_stop"
     android:text="Start"
     />
+<EditText android:id="@+id/text_entry"
+    android:layout_width="fill_parent" 
+    android:layout_height="wrap_content"
+    android:layout_alignParentTop="true"
+    android:layout_toLeftOf="@id/btn_start"
+    android:digits="01234567890"
+    android:text="9999"
+    />
 <TextView android:id="@+id/tv"
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
+    android:layout_below="@id/text_entry"
     android:text="UdpRespondActivity"
     />
-</LinearLayout>
+</RelativeLayout>
 
diff --git a/src/com/example/udpresponder/UdpRespondActivity.java b/src/com/example/udpresponder/UdpRespondActivity.java
index 7ef9709..30da0b4 100644
--- a/src/com/example/udpresponder/UdpRespondActivity.java
+++ b/src/com/example/udpresponder/UdpRespondActivity.java
@@ -1,35 +1,44 @@
 package com.example.udpresponder;
 
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
 import android.app.Activity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.os.SystemClock;
 import android.widget.TextView;
+import android.widget.EditText;
 import android.widget.Button;
 import android.view.View;
 import android.view.View.OnClickListener;
 
 public class UdpRespondActivity extends Activity {
 
+	private TextView tv;
+	private EditText et;
+
 	private Handler mHandler = new Handler() {
 		public void handleMessage(Message msg) {
 			Bundle bdl = msg.getData();
-			updateUI(bdl.getString("ln"));
+			tv.append(bdl.getString("ln"));
 		}
 	};
 
-	private TextView tv;
-
 	private OnClickListener mStartListener = new OnClickListener() {
 		public void onClick(View v) {
-			tv.append("Start pressed\n");
+			CharSequence cs = et.getText();
+			tv.append("Start pressed, data: " +
+				cs.toString() +
+				" (unimplemented)\n");
 		}
 	};
 
 	private OnClickListener mStopListener = new OnClickListener() {
 		public void onClick(View v) {
-			tv.append("Stop pressed\n");
+			tv.append("Stop pressed, exiting\n");
 			finish();
 		}
 	};
@@ -40,6 +49,7 @@ public class UdpRespondActivity extends Activity {
 		setContentView(R.layout.main);
 		tv = (TextView)findViewById(R.id.tv);
 		tv.append(" Starting\n");
+		et = (EditText)findViewById(R.id.text_entry);
 		Button btn_start = (Button)findViewById(R.id.btn_start);
 		btn_start.setOnClickListener(mStartListener);
 		Button btn_stop = (Button)findViewById(R.id.btn_stop);
@@ -47,23 +57,56 @@ public class UdpRespondActivity extends Activity {
 		startBgThread();
 	}
 
-	private void updateUI(String str) {
-		tv.append(str);
+	private void println(String str) {
+		Bundle bdl = new Bundle();
+		bdl.putString("ln", str + "\n");
+		Message msg = Message.obtain(mHandler);
+		msg.setData(bdl);
+		msg.sendToTarget();
 	}
 
 	protected void startBgThread () {
 		Thread t = new Thread() {
 			public void run() {
-				while (true) {
-					SystemClock.sleep(3000);
-					Bundle bdl = new Bundle();
-					bdl.putString("ln", "this is msg\n");
-					Message msg = Message.obtain(mHandler);
-					msg.setData(bdl);
-					msg.sendToTarget();
-				}
+				bgTask();
 			}
 		};
 		t.start();
 	}
+
+	private void bgTask() {
+		DatagramSocket s = null;
+		try {
+			s = new DatagramSocket(9999);
+		} catch (java.net.SocketException e) {
+			println("socket: " + e);
+			return;
+		}
+//		InetSocketAddress sa = new InetSocketAddress(9999);
+//		try {
+//			s.bind(sa);
+//		} catch (IllegalArgumentException e) {
+//			println("bind: " + e);
+//			return;
+//		} catch (java.net.SocketException e) {
+//			println("bind: " + e);
+//			return;
+//		}
+		println("Bound to port " + s.getLocalPort());
+		while (true) {
+			byte[] data = new byte[256];
+			DatagramPacket pkt = new DatagramPacket(data, 256);
+			try {
+				s.receive(pkt);
+			} catch (java.io.IOException e) {
+				println("receive: " + e);
+			}
+			InetAddress ia = pkt.getAddress();
+			int ip = pkt.getPort();
+			byte[] id = pkt.getData();
+			println(ia.toString() + ":" +
+				ip + " " +
+				id.toString());
+		}
+	}
 }
-- 
2.39.2