Get server's listening channel

Change-Id: Ia1cb3486a4ba502185efdcf6d7bcf0f37bb55261

core/java/android/bluetooth/BluetoothServerSocket.java

@@ -62,6 +62,7 @@ public final class BluetoothServerSocket implements Closeable {
     /*package*/ final BluetoothSocket mSocket;
     private Handler mHandler;
     private int mMessage;
+    private final int mChannel;
 
     /**
      * Construct a socket for incoming connections.
@@ -74,6 +75,7 @@ public final class BluetoothServerSocket implements Closeable {
      */
     /*package*/ BluetoothServerSocket(int type, boolean auth, boolean encrypt, int port)
             throws IOException {
+        mChannel = port;
         mSocket = new BluetoothSocket(type, -1, auth, encrypt, null, port, null);
     }
 
@@ -125,4 +127,12 @@ public final class BluetoothServerSocket implements Closeable {
         mHandler = handler;
         mMessage = message;
     }
+
+    /**
+     * Returns the channel on which this socket is bound.
+     * @hide
+     */
+    public int getChannel() {
+        return mChannel;
+    }
 }