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package edu.mit.mobile.android.greenwheel; /*from ww w.j a v a2 s.c om*/ /* * 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 info.staticfree.android.taguid.BuildConfig; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.util.UUID; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; 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 BluetoothService { // Debugging private static final String TAG = "BluetoothService"; private static final boolean D = BuildConfig.DEBUG; private static final UUID SPP_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); // Member fields private final BluetoothAdapter mAdapter; private final Handler mHandler; //private AcceptThread mAcceptThread; private ConnectThread mConnectThread; private ConnectedThread mConnectedThread; private int mState; public static final int MAX_CONNECTION_ATTEMPTS = 5; private int connectionAttempts = 0; private boolean reconnOk = true; private BluetoothDevice lastKnownDevice; // 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_RECONNECTING = 4; // Message types sent from the BluetoothGreenwheelService 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 BluetoothGreenwheelService Handler public static final String DEVICE_NAME = "device_name"; public static final String TOAST = "toast"; /** * Constructor. Prepares a new BluetoothGreenwheel session. * @param context The UI Activity Context * @param handler A Handler to send messages back to the UI Activity */ public BluetoothService(Context context, Handler handler) { mAdapter = BluetoothAdapter.getDefaultAdapter(); mState = STATE_NONE; mHandler = handler; } /** * Set the current state of the greenwheel connection * @param state An integer defining the current connection state */ protected synchronized void setState(int state) { if (D) { Log.d(TAG, "setState() " + mState + " -> " + state); } mState = state; // Give the new state to the Handler so the UI Activity can update mHandler.obtainMessage(MESSAGE_STATE_CHANGE, state, -1).sendToTarget(); } /** * Return the current connection state. */ public synchronized int getState() { return mState; } /** * Start the greenwheel 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 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 (D) { Log.d(TAG, "connect to: " + device); } reconnOk = true; // 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); mConnectThread.start(); lastKnownDevice = device; if (mState != STATE_RECONNECTING){ connectionAttempts = 0; } setState(STATE_CONNECTING); } /** * @return true if a reconnection was attempted. */ private synchronized boolean reconnectLast() { if (connectionAttempts <= MAX_CONNECTION_ATTEMPTS && (mState == STATE_CONNECTED || mState == STATE_CONNECTING) && lastKnownDevice != null && reconnOk){ setState(STATE_RECONNECTING); connect(lastKnownDevice); connectionAttempts++; return true; } setState(STATE_NONE); return false; } public BluetoothDevice getDevice(){ return lastKnownDevice; } /** * 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 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 final Message msg = mHandler.obtainMessage(MESSAGE_DEVICE_NAME); final Bundle bundle = new Bundle(); bundle.putString(DEVICE_NAME, device.getName()); msg.setData(bundle); mHandler.sendMessage(msg); setState(STATE_CONNECTED); connectionAttempts = 0; } /** * Stop all threads and disconnect. */ public synchronized void stop() { if (D) { Log.d(TAG, "stop"); } if (mState == STATE_NONE) { return; } reconnOk = false; 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() { if (!reconnectLast()){ // Send a failure message back to the Activity final Message msg = mHandler.obtainMessage(MESSAGE_TOAST); final Bundle bundle = new Bundle(); bundle.putString(TOAST, "Unable to connect device"); msg.setData(bundle); mHandler.sendMessage(msg); } } /** * Indicate that the connection was lost and notify the UI Activity. */ private void connectionLost() { if (!reconnectLast()){ // Send a failure message back to the Activity final Message msg = mHandler.obtainMessage(MESSAGE_TOAST); final Bundle bundle = new Bundle(); bundle.putString(TOAST, "Device connection was lost"); msg.setData(bundle); mHandler.sendMessage(msg); } } /** * 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(SPP_UUID); } catch (final IOException e) { Log.e(TAG, "create() failed", e); } mmSocket = tmp; } @Override 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 (final IOException e) { connectionFailed(); // Close the socket try { mmSocket.close(); } catch (final IOException e2) { Log.e(TAG, "unable to close() socket during connection failure", e2); } // Start the service over to restart listening mode //BluetoothService.this.start(); return; } // Reset the ConnectThread because we're done synchronized (BluetoothService.this) { mConnectThread = null; } // Start the connected thread connected(mmSocket, mmDevice); } public void cancel() { try { mmSocket.close(); } catch (final 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; 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 (final IOException e) { Log.e(TAG, "temp sockets not created", e); } mmInStream = tmpIn; mmOutStream = tmpOut; } @Override public void run() { Log.i(TAG, "BEGIN mConnectedThread"); final BufferedReader br = new BufferedReader(new InputStreamReader(mmInStream)); // Keep listening to the InputStream while connected while (true) { try { final String line = br.readLine(); // Send the obtained bytes to the UI Activity mHandler.obtainMessage(MESSAGE_READ, line.length(), -1, line.getBytes()) .sendToTarget(); } catch (final IOException e) { Log.d(TAG, "disconnected"); connectionLost(); 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(MESSAGE_WRITE, buffer.length, -1, buffer) .sendToTarget(); } catch (final IOException e) { Log.e(TAG, "Exception during write", e); } } public void cancel() { try { mmSocket.close(); } catch (final IOException e) { Log.e(TAG, "close() of connect socket failed", e); } } } }