On the topic of Android Bluetooth Server, I have many questions.
I build a BluetoothService, which is connected as a server. Following the
guide of Android developers:
http://developer.android.com/guide/topics/connectivity/bluetooth.html#ManagingAConnection
I simply the codes of BluetoothChat, in which I remove parts of bluetooth
client, and the program
mainly has methods "AcceptThread" "ConnectedThread" and
"connected(socket,device)".
I succeed in connecting this bluetooth server from my PC (through
Docklight). But I happen to some
problems:
1. The first connection is ok (means the bluetooth server receives datas).
When I disconnect the connection on PC side,
and connect the bluetooth server again (on the same COM port), while the
bluetooth service keeps as before (no restart),
it shows connected state on the PC side, but my bluetooth server does not
receive anything, and it never pass by the
codes of "AcceptThread" (as I set many breakpoints in my program but it
never stop).
It seems the second connection is quite strange but I can't find a way to
trace it.
2. *I'm confused that each time when the client side disconnects, whether
the bluetooth server need to restart service nor not?*
These problems are important for my project, and I attahced codes of
Bluetooth server. Thank you in advance.
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/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.UUID;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
/**
* This class does all the work for setting up and managing Bluetooth
* connections with other devices. It has a thread that listens for incoming
* connections, a thread for connecting with a device, and a thread for
* performing data transmissions when connected.
*/
public class BluetoothServiceChou {
// Debugging
private static final String TAG = "BluetoothService";
private static final String FILE_NAME = "IHM_RECORD_TRAME.txt";
// Name for the SDP record when creating server socket
private static final String NAME = "Bluetooth_Server";
// Unique UUID for this application
private static final UUID MY_UUID = UUID
.fromString("00001101-0000-1000-8000-00805F9B34FB");
// Member fields
private BluetoothAdapter mAdapter;
private Handler mHandler;
public void setmHandler(Handler m_Handler) {
this.mHandler = m_Handler;
}
private AcceptThread mAcceptThread;
private ConnectedThread mConnectedThread;
public static int mState;
// Message types sent from the BluetoothChatService Handler
public static final int MESSAGE_STATE_CHANGE = 1;
public static final int MESSAGE_READ = 2;
public static final int MESSAGE_WRITE = 3;
public static final int MESSAGE_DEVICE_NAME = 4;
public static final int MESSAGE_TOAST = 5;
// Key names received from the BluetoothChatService Handler
public static final String DEVICE_NAME = "device_name";
public static final String TOAST = "toast";
Context context;
Intepreter interpreter, poidInterpreter;
// Constants that indicate the current connection state
public static final int STATE_NONE = 0; // we're doing nothing
public static final int STATE_LISTEN = 1; // now listening for incoming
// connections
public static final int STATE_CONNECTING = 2; // now initiating an outgoing
// connection
public static final int STATE_CONNECTED = 3; // now connected to a remote
// device
public int phase;
public int getPhase() {
return phase;
}
public void setPhase(int phase) {
this.phase = phase;
}
/**
* Constructor. Prepares a new BluetoothChat session.
*
* @param context
* The UI Activity Context
* @param handler
* A Handler to send messages back to the UI Activity
*/
public BluetoothServiceChou(Context context, Handler handler, int phase) {
mAdapter = BluetoothAdapter.getDefaultAdapter();
mState = STATE_NONE;
mHandler = handler;
this.context = context;
interpreter = new Intepreter(handler);
this.phase = phase;
}
/**
* Set the current state of the chat connection
*
* @param state
* An integer defining the current connection state
*/
private synchronized void setState(int state) {
if (D)
Log.d(TAG, "setState() " + mState + " -> " + state);
mState = state;
}
/**
* Return the current connection state.
*/
public synchronized int getState() {
return mState;
}
public synchronized long getUpdatedTime() {
return updatedTime;
}
/**
* Start the chat service. Specifically start AcceptThread to begin a
* session in listening (server) mode. Called by the Activity onResume()
*/
public synchronized void start() {
if (D)
Log.d(TAG, "start");
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
// Start the thread to listen on a BluetoothServerSocket
if (mAcceptThread == null) {
mAcceptThread = new AcceptThread();
mAcceptThread.start();
}
setState(STATE_LISTEN);
}
/**
* Start the ConnectedThread to begin managing a Bluetooth connection
*
* @param socket
* The BluetoothSocket on which the connection was made
* @param device
* The BluetoothDevice that has been connected
*/
public synchronized void connected(BluetoothSocket socket,
BluetoothDevice device) {
if (D)
Log.d(TAG, "connected");
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
// Cancel the accept thread because we only want to connect to one
// device
// if (mAcceptThread != null) {
// mAcceptThread.cancel();
// mAcceptThread = null;
// }
// Start the thread to manage the connection and perform transmissions
mConnectedThread = new ConnectedThread(socket, mHandler);
mConnectedThread.start();
// Send the name of the connected device back to the UI Activity
Message msg = mHandler.obtainMessage(MESSAGE_DEVICE_NAME);
Bundle bundle = new Bundle();
bundle.putString(DEVICE_NAME, device.getName());
msg.setData(bundle);
// mHandler.sendMessage(msg);
setState(STATE_CONNECTED);
}
/**
* Stop all threads
*/
public synchronized void stop() {
if (D)
Log.d(TAG, "stop");
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
if (mAcceptThread != null) {
mAcceptThread.cancel();
mAcceptThread = null;
}
setState(STATE_NONE);
}
/**
* Write to the ConnectedThread in an unsynchronized manner
*
* @param out
* The bytes to write
* @see ConnectedThread#write(byte[])
*/
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
if (mState != STATE_CONNECTED)
return;
r = mConnectedThread;
}
// Perform the write unsynchronized
r.write(out);
pw.println(showFrameReceived(null, out));
}
/**
* Indicate that the connection attempt failed and notify the UI Activity.
*/
private void connectionFailed() {
setState(STATE_LISTEN);
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(TOAST, "Unable to connect device");
msg.setData(bundle);
// mHandler.sendMessage(msg);
}
/**
* This thread runs while listening for incoming connections. It behaves
* like a server-side client. It runs until a connection is accepted (or
* until cancelled).
*/
private class AcceptThread extends Thread {
// The local server socket
private final BluetoothServerSocket mmServerSocket;
public AcceptThread() {
BluetoothServerSocket tmp = null;
// Create a new listening server socket
try {
tmp = mAdapter
.listenUsingRfcommWithServiceRecord(NAME, MY_UUID);
} catch (IOException e) {
Log.e(TAG, "listen() failed", e);
}
mmServerSocket = tmp;
}
public void run() {
if (D)
Log.d(TAG, "BEGIN mAcceptThread" + this);
setName("AcceptThread");
BluetoothSocket socket = null;
// Listen to the server socket if we're not connected
while (mState != STATE_CONNECTED) {
try {
// This is a blocking call and will only return on a
// successful connection or an exception
socket = mmServerSocket.accept();
} catch (IOException e) {
Log.e(TAG, "accept() failed", e);
break;
}
// If a connection was accepted
if (socket != null) {
synchronized (BluetoothServiceChou.this) {
switch (mState) {
case STATE_LISTEN:
case STATE_CONNECTING:
// Situation normal. Start the connected thread.
connected(socket, socket.getRemoteDevice());
break;
case STATE_NONE:
case STATE_CONNECTED:
// Either not ready or already connected. Terminate
// new socket.
try {
socket.close();
} catch (IOException e) {
Log.e(TAG, "Could not close unwanted socket", e);
}
break;
}
}
}
}
if (D)
Log.i(TAG, "END mAcceptThread");
}
public void cancel() {
if (D)
Log.d(TAG, "cancel " + this);
try {
mmServerSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of server failed", e);
}
}
}
/**
* This thread runs during a connection with a remote device. It handles all
* incoming and outgoing transmissions.
*/
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket, Handler mHandler) {
Log.d(TAG, "create ConnectedThread");
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the BluetoothSocket input and output streams
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) {
Log.e(TAG, "temp sockets not created", e);
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
@SuppressWarnings("unchecked")
public void run() {
Log.i(TAG, "BEGIN mConnectedThread");
int b;
try {
while ((b = mmInStream.read()) != -1) {
updatedTime=System.currentTimeMillis();
StringBuilder buf = new StringBuilder();
b = b & 0xff;
if (b < 0x10) {
buf.append("0");
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Write to the connected OutStream.
*
* @param buffer
* The bytes to write
*/
public void write(byte[] buffer) {
try {
mmOutStream.write(buffer);
pw.println(showFrameReceived(null, buffer));
} catch (IOException e) {
Log.e(TAG, "Exception during write", e);
}
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of connect socket failed", e);
}
}
}
public Handler getmHandler() {
return mHandler;
}
}
