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The source code is released under:
Apache License
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package com.bluetooth.phone2phone; /*from w w w. j a va 2 s . c om*/ import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; 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; public class ConnectionService { private static final String TAG = "ConnectionService"; private static final boolean debug = true; //Name for the SDP record when creating server socket private static final String NAME = "Phone2Phone"; private static final UUID MY_UUID = UUID.fromString("63c9c9be-4890-4d0d-9fa0-68694f310f37"); //Member fields private final BluetoothAdapter mAdapter; private AcceptThread mAcceptThread; private ConnectThread mConnectThread; private ConnectedThread mConnectedThread; private int mState; private final Handler mHandler; //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 /** * 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 ConnectionService(Context context, Handler handler) { mAdapter = BluetoothAdapter.getDefaultAdapter(); mState = STATE_NONE; mHandler = handler; } /** * Set the current state of the chat connection * * @param state An integer defining the current connection state */ private synchronized void setState(int state) { if (debug) Log.d(TAG, "setState() " + mState + " -> " + state); mState = state; // Give the new state to the Handler so the UI Activity can update mHandler.obtainMessage(Main.MESSAGE_STATE_CHANGE, state, -1).sendToTarget(); } /** * Return the current connection state. */ public synchronized int getState() { return mState; } /** * 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 (debug) Log.d(TAG, "start"); // Cancel any thread attempting to make a connection if (mConnectThread != null) { mConnectThread.cancel(); mConnectThread = null; } // 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 ConnectThread to initiate a connection to a remote device. * * @param device The BluetoothDevice to connect */ public synchronized void connect(BluetoothDevice device) { if (debug) Log.d(TAG, "connect to: " + device); // Cancel any thread attempting to make a connection if (mState == STATE_CONNECTING) { if (mConnectThread != null) { mConnectThread.cancel(); mConnectThread = null; } } // Cancel any thread currently running a connection if (mConnectedThread != null) { mConnectedThread.cancel(); mConnectedThread = null; } // Start the thread to connect with the given device mConnectThread = new ConnectThread(device); String address = device.getAddress(); Message message = mHandler.obtainMessage(Main.MESSAGE_SAVE_DEVICE, 0, 0, address); mHandler.sendMessage(message); mConnectThread.start(); setState(STATE_CONNECTING); } /** * 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 (debug) Log.d(TAG, "connected"); // Cancel the thread that completed the connection if (mConnectThread != null) { mConnectThread.cancel(); mConnectThread = null; } // 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); mConnectedThread.start(); // Send the name of the connected device back to the UI Activity Message msg = mHandler.obtainMessage(Main.MESSAGE_DEVICE_NAME); Bundle bundle = new Bundle(); bundle.putString(Main.DEVICE_NAME, device.getName()); msg.setData(bundle); mHandler.sendMessage(msg); setState(STATE_CONNECTED); } /** * Stop all threads */ public synchronized void stop() { if (debug) Log.d(TAG, "stop"); if (mConnectThread != null) { mConnectThread.cancel(); mConnectThread = null; } 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); } /** * 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(Main.MESSAGE_TOAST); Bundle bundle = new Bundle(); bundle.putString(Main.TOAST, "Unable to connect device"); msg.setData(bundle); mHandler.sendMessage(msg); //Reset address of last device msg = mHandler.obtainMessage(Main.MESSAGE_RESET_DEVICE); mHandler.sendMessage(msg); } /** * Indicate that the connection was lost and notify the UI Activity. */ private void connectionLost() { setState(STATE_LISTEN); // Send a failure message back to the Activity Message msg = mHandler.obtainMessage(Main.MESSAGE_TOAST); Bundle bundle = new Bundle(); bundle.putString(Main.TOAST, "Device connection was lost"); 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 (debug) 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 (ConnectionService.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 (debug) Log.i(TAG, "END mAcceptThread"); } public void cancel() { if (debug) Log.d(TAG, "cancel " + this); try { mmServerSocket.close(); } catch (IOException e) { Log.e(TAG, "close() of server failed", e); } } } /** * This thread runs while attempting to make an outgoing connection * with a device. It runs straight through; the connection either * succeeds or fails. */ private class ConnectThread extends Thread { private final BluetoothSocket mmSocket; private final BluetoothDevice mmDevice; public ConnectThread(BluetoothDevice device) { mmDevice = device; BluetoothSocket tmp = null; // Get a BluetoothSocket for a connection with the // given BluetoothDevice try { tmp = device.createRfcommSocketToServiceRecord(MY_UUID); } catch (IOException e) { Log.e(TAG, "create() failed", e); } mmSocket = tmp; } public void run() { Log.i(TAG, "BEGIN mConnectThread"); setName("ConnectThread"); // Always cancel discovery because it will slow down a connection mAdapter.cancelDiscovery(); // Make a connection to the BluetoothSocket try { // This is a blocking call and will only return on a // successful connection or an exception mmSocket.connect(); } catch (IOException e) { connectionFailed(); // Close the socket try { mmSocket.close(); } catch (IOException e2) { Log.e(TAG, "unable to close() socket during connection failure", e2); } // Start the service over to restart listening mode ConnectionService.this.start(); return; } // Reset the ConnectThread because we're done synchronized (ConnectionService.this) { mConnectThread = null; } // Start the connected thread connected(mmSocket, mmDevice); } public void cancel() { try { mmSocket.close(); } catch (IOException e) { Log.e(TAG, "close() of connect socket 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; //Used to alternate between reading a file name and a file private int count = 0; public ConnectedThread(BluetoothSocket socket) { 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; } public void run() { Log.i(TAG, "BEGIN mConnectedThread"); byte[] buffer = new byte[Main.BUFFER_SIZE]; int bytes; // Keep listening to the InputStream while connected while (true) { try { // Read from the InputStream bytes = mmInStream.read(buffer); if((count % 2)==0){ //Even numbers are for file names // Send the obtained bytes to the UI Activity mHandler.obtainMessage(Main.MESSAGE_READ_FILENAME, bytes, -1, buffer) .sendToTarget(); } else{ //Odd numbers are for files // Send the obtained bytes to the UI Activity mHandler.obtainMessage(Main.MESSAGE_READ_FILE, bytes, -1, buffer) .sendToTarget(); } count = count+1; Log.d("ConnectionService-ConnectedThread","read buffer="+buffer); //Log.d("ConnectionService-ConnectedThread","is read buffer=file? "+ Arrays.equals(buffer, Main.file)); } catch (IOException e) { Log.e(TAG, "disconnected", e); connectionLost(); break; } } } /** * Write to the connected OutStream. * * @param buffer The bytes to write */ public void write(byte[] buffer) { try { mmOutStream.write(buffer); mmOutStream.flush(); if((count % 2)==0){ //Even numbers are for file names // Share the sent message back to the UI Activity mHandler.obtainMessage(Main.MESSAGE_WRITE_FILENAME, -1, -1, buffer) .sendToTarget(); } else{ //Odd numbers are for files // Share the sent message back to the UI Activity mHandler.obtainMessage(Main.MESSAGE_WRITE_FILE, -1, -1, buffer) .sendToTarget(); } count = count+1; Log.d("ConnectionService-ConnectedThread","write buffer="+buffer); //Log.d("ConnectionService-ConnectedThread","is write buffer=file? "+ Arrays.equals(buffer, Main.file)); } 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); } } } }