begin bluetooth work. Add new class that logs when BT comes on and

goes off.  Sketch out always-on listening socket, but it's not called
yet.

xwords4/android/XWords4/AndroidManifest.xml

@@ -31,6 +31,9 @@
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
   <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
   <uses-permission android:name="android.permission.VIBRATE" />
+  <uses-permission android:name="android.permission.BLUETOOTH" />
+  <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+
   <!-- <uses-permission android:name="android.permission.RECEIVE_SMS" /> -->
   <!-- <uses-permission android:name="android.permission.SEND_SMS" /> -->
 
@@ -138,6 +141,12 @@
         </intent-filter>
     </receiver>
 
+    <receiver android:name=".BTConnection">
+      <intent-filter>
+        <action android:name="android.bluetooth.adapter.action.STATE_CHANGED" />                                                                    
+      </intent-filter>
+    </receiver>
+
 
     <!-- <receiver android:name="NBSReceiver"> -->
     <!--   <intent-filter android:priority="10"> -->

xwords4/android/XWords4/src/org/eehouse/android/xw4/BTConnection.java

@@ -0,0 +1,112 @@
+/* -*- compile-command: "cd ../../../../../; ant debug install"; -*- */
+/*
+ * Copyright 2012 by Eric House (xwords@eehouse.org).  All rights
+ * reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+package org.eehouse.android.xw4;
+
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothServerSocket;
+import android.bluetooth.BluetoothSocket;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import java.io.InputStream;
+
+public class BTConnection extends BroadcastReceiver {
+    private static BluetoothAdapter s_btAdapter = BluetoothAdapter.getDefaultAdapter();
+    private static BluetoothServerSocket s_serverSocket;
+
+    private class BTListener extends Thread {
+        @Override
+        public void run() {
+            byte[] buffer = new byte[1024];
+            for ( ; ; ) {
+                try {
+                    s_serverSocket = s_btAdapter.
+                        listenUsingRfcommWithServiceRecord( XWApp.getAppName(),
+                                                            XWApp.getAppUUID() );
+                } catch ( java.io.IOException ioe ) {
+                    DbgUtils.logf( "listenUsingRfcommWithServiceRecord=>%s", ioe.toString() );
+                    break;
+                }
+
+                BluetoothSocket socket = null;
+                InputStream inStream = null;
+                try {
+                    socket = s_serverSocket.accept(); // blocks
+                    inStream = socket.getInputStream();
+                    int nRead = inStream.read( buffer );
+                    DbgUtils.logf( "read %d bytes from BT socket", nRead );
+                    socket.close();
+                } catch ( java.io.IOException ioe ) {
+                    DbgUtils.logf( "accept=>%s", ioe.toString() );
+                    break;
+                }
+
+                // now handle what's on the socket
+
+            } // for ( ; ; )
+
+            if ( null != s_serverSocket ) {
+                try {
+                    s_serverSocket.close();
+                } catch ( java.io.IOException ioe ) {
+                    DbgUtils.logf( "close()=>%s", ioe.toString() );
+                }
+            }
+        }
+    }
+
+    private BTListener m_listener = null;
+
+    @Override
+    public void onReceive( Context context, Intent intent ) {
+        int newState = intent.getIntExtra( BluetoothAdapter.EXTRA_STATE, -1 );
+        String asString = null;
+        switch ( newState ) {
+        case -1:
+            break;
+        case BluetoothAdapter.STATE_OFF:
+            asString = "STATE_OFF";
+            break;
+        case BluetoothAdapter.STATE_TURNING_ON:
+            asString = "STATE_TURNING_ON";
+            break;
+        case BluetoothAdapter.STATE_ON:
+            asString = "STATE_ON";
+            m_listener = new BTListener();
+            m_listener.start();
+            break;
+        case BluetoothAdapter.STATE_TURNING_OFF:
+            asString = "STATE_TURNING_OFF";
+            if ( null != m_listener ) {
+                m_listener.stop();
+                m_listener = null;
+            }
+            break;
+        }
+
+        if ( null != asString ) {
+            DbgUtils.logf( "onReceive: new BT state = %s", asString );
+        }
+
+    } // onReceive
+
+}

xwords4/android/XWords4/src/org/eehouse/android/xw4/XWApp.java

@@ -21,6 +21,7 @@
 package org.eehouse.android.xw4;
 
 import android.app.Application;
+import java.util.UUID;
 
 public class XWApp extends Application {
 
@@ -38,4 +39,13 @@ public class XWApp extends Application {
 
         RelayReceiver.RestartTimer( this );
     }
+
+    public static UUID getAppUUID() {
+        return UUID.fromString( "d0837107-421f-11e1-b86c-0800200c9a66" );
+    }
+
+    public static String getAppName() {
+        return "Crosswords";
+    }
+
 }