/*
* Copyright (C) 2014 Mantas Palaima
*
* 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.
*/
package io.palaima.smoothbluetooth;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;
class BluetoothService {
private static final String TAG = "BluetoothService";
// 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 static final int STATE_NULL = -1; // now service is null
// 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;
private static final String NAME_SECURE = "Bluetooth Secure";
private static final UUID UUID_ANDROID_DEVICE =
UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66");
private static final UUID UUID_OTHER_DEVICE =
UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
private final BluetoothAdapter mAdapter;
private final Handler mHandler;
private boolean mIsSecure = true;
private AcceptThread mSecureAcceptThread;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
private boolean isAndroid;
public BluetoothService(Handler handler) {
mAdapter = BluetoothAdapter.getDefaultAdapter();
mState = BluetoothService.STATE_NONE;
mHandler = handler;
}
// Set the current state of the chat connection
// state : An integer defining the current connection state
private synchronized void setState(int state) {
Log.d(TAG, "setState() " + mState + " -> " + state);
mState = state;
// Give the new state to the Handler so the UI Activity can update
mHandler.obtainMessage(BluetoothService.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(boolean android, boolean secure) {
isAndroid = android;
mIsSecure = secure;
// 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;}
setState(BluetoothService.STATE_LISTEN);
// Start the thread to listen on a BluetoothServerSocket
if (mSecureAcceptThread == null) {
mSecureAcceptThread = new AcceptThread(isAndroid, mIsSecure);
mSecureAcceptThread.start();
}
}
// Start the ConnectThread to initiate a connection to a remote device
// device : The BluetoothDevice to tryConnect
// secure : Socket Security type - Secure (true) , Insecure (false)
public synchronized void connect(BluetoothDevice device) {
// Cancel any thread attempting to make a connection
if (mState == BluetoothService.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 tryConnect with the given device
mConnectThread = new ConnectThread(device);
mConnectThread.start();
setState(BluetoothService.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, final String socketType) {
// 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 tryConnect to one device
if (mSecureAcceptThread != null) {
mSecureAcceptThread.cancel();
mSecureAcceptThread = null;
}
// Start the thread to manage the connection and perform transmissions
mConnectedThread = new ConnectedThread(socket, socketType);
mConnectedThread.start();
// Send the name of the connected device back to the UI Activity
Message msg = mHandler.obtainMessage(MESSAGE_DEVICE_NAME);
mHandler.sendMessage(msg);
setState(BluetoothService.STATE_CONNECTED);
}
// Stop all threads
public synchronized void stop() {
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
if (mSecureAcceptThread != null) {
mSecureAcceptThread.cancel();
mSecureAcceptThread.kill();
mSecureAcceptThread = null;
}
setState(BluetoothService.STATE_NONE);
}
// Write to the ConnectedThread in an unsynchronized manner
// out : The bytes to write
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
if (mState != BluetoothService.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() {
// Start the service over to restart listening mode
BluetoothService.this.start(isAndroid, mIsSecure);
}
// Indicate that the connection was lost and notify the UI Activity
private void connectionLost() {
// Start the service over to restart listening mode
BluetoothService.this.start(isAndroid, mIsSecure);
}
// 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 BluetoothServerSocket mmServerSocket;
private String mSocketType;
boolean isRunning = true;
public AcceptThread(boolean isAndroid, boolean secure) {
BluetoothServerSocket tmp = null;
// Create a new listening server socket
try {
if (secure) {
if(isAndroid)
tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME_SECURE, UUID_ANDROID_DEVICE);
else
tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME_SECURE, UUID_OTHER_DEVICE);
} else {
if(isAndroid)
tmp = mAdapter.listenUsingInsecureRfcommWithServiceRecord(NAME_SECURE, UUID_ANDROID_DEVICE);
else
tmp = mAdapter.listenUsingInsecureRfcommWithServiceRecord(NAME_SECURE, UUID_OTHER_DEVICE);
}
} catch (IOException e) { }
mmServerSocket = tmp;
}
public void run() {
setName("AcceptThread" + mSocketType);
BluetoothSocket socket;
// Listen to the server socket if we're not connected
while (mState != BluetoothService.STATE_CONNECTED && isRunning) {
try {
// This is a blocking call and will only return on a
// successful connection or an exception
socket = mmServerSocket.accept();
} catch (Exception e) {
break;
}
// If a connection was accepted
if (socket != null) {
synchronized (BluetoothService.this) {
switch (mState) {
case BluetoothService.STATE_LISTEN:
case BluetoothService.STATE_CONNECTING:
// Situation normal. Start the connected thread.
connected(socket, socket.getRemoteDevice(),
mSocketType);
break;
case BluetoothService.STATE_NONE:
case BluetoothService.STATE_CONNECTED:
// Either not ready or already connected. Terminate new socket.
try {
socket.close();
} catch (IOException e) { }
break;
}
}
}
}
}
public void cancel() {
try {
mmServerSocket.close();
mmServerSocket = null;
} catch (Exception e) { }
}
public void kill() {
isRunning = false;
}
}
// 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;
private String mSocketType;
public ConnectThread(BluetoothDevice device) {
mmDevice = device;
BluetoothSocket tmp = null;
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {
if (mIsSecure) {
if (isAndroid) {
tmp = device.createRfcommSocketToServiceRecord(UUID_ANDROID_DEVICE);
} else {
tmp = device.createRfcommSocketToServiceRecord(UUID_OTHER_DEVICE);
}
} else {
if (isAndroid) {
tmp = device.createInsecureRfcommSocketToServiceRecord(UUID_ANDROID_DEVICE);
} else {
tmp = device.createInsecureRfcommSocketToServiceRecord(UUID_OTHER_DEVICE);
}
}
} catch (IOException e) { }
mmSocket = tmp;
}
public void run() {
// 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) {
// Close the socket
try {
mmSocket.close();
} catch (IOException e2) { }
connectionFailed();
return;
}
// Reset the ConnectThread because we're done
synchronized (BluetoothService.this) {
mConnectThread = null;
}
// Start the connected thread
connected(mmSocket, mmDevice, mSocketType);
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException 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, String socketType) {
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) { }
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
// Keep listening to the InputStream while connected
while (true) {
try {
int data = mmInStream.read();
mHandler.obtainMessage(BluetoothService.MESSAGE_READ, data).sendToTarget();
} catch (IOException e) {
connectionLost();
// Start the service over to restart listening mode
BluetoothService.this.start(isAndroid, mIsSecure);
break;
}
}
}
// Write to the connected OutStream.
// @param buffer The bytes to write
public void write(byte[] buffer) {
try {
mmOutStream.write(buffer);
// Share the sent message back to the UI Activity
mHandler.obtainMessage(BluetoothService.MESSAGE_WRITE
, -1, -1, buffer).sendToTarget();
} catch (IOException e) { }
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}
}
