2 * Copyright © 2012 Mike Beattie <mike@ethernal.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
18 package org.altusmetrum.AltosDroid;
20 import java.lang.ref.WeakReference;
21 import java.util.ArrayList;
22 import java.util.concurrent.TimeoutException;
23 import java.util.Timer;
24 import java.util.TimerTask;
26 import android.app.Notification;
27 //import android.app.NotificationManager;
28 import android.app.PendingIntent;
29 import android.app.Service;
30 import android.bluetooth.BluetoothDevice;
31 import android.content.Intent;
32 //import android.os.Bundle;
33 import android.os.IBinder;
34 import android.os.Handler;
35 import android.os.Message;
36 import android.os.Messenger;
37 import android.os.RemoteException;
38 import android.util.Log;
39 import android.widget.Toast;
41 import org.altusmetrum.AltosLib.*;
43 public class TelemetryService extends Service {
45 private static final String TAG = "TelemetryService";
46 private static final boolean D = true;
48 static final int MSG_REGISTER_CLIENT = 1;
49 static final int MSG_UNREGISTER_CLIENT = 2;
50 static final int MSG_CONNECT = 3;
51 static final int MSG_CONNECTED = 4;
52 static final int MSG_CONNECT_FAILED = 5;
53 static final int MSG_DISCONNECTED = 6;
54 static final int MSG_TELEMETRY = 7;
56 public static final int STATE_NONE = 0;
57 public static final int STATE_READY = 1;
58 public static final int STATE_CONNECTING = 2;
59 public static final int STATE_CONNECTED = 3;
61 // Unique Identification Number for the Notification.
62 // We use it on Notification start, and to cancel it.
63 private int NOTIFICATION = R.string.telemetry_service_label;
64 //private NotificationManager mNM;
66 // Timer - we wake up every now and then to decide if the service should stop
67 private Timer timer = new Timer();
69 ArrayList<Messenger> mClients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
70 final Handler mHandler = new IncomingHandler(this);
71 final Messenger mMessenger = new Messenger(mHandler); // Target we publish for clients to send messages to IncomingHandler.
73 // Name of the connected device
74 private BluetoothDevice device = null;
75 private AltosBluetooth mAltosBluetooth = null;
76 private AltosConfigData mConfigData = null;
77 private TelemetryReader mTelemetryReader = null;
79 // internally track state of bluetooth connection
80 private int state = STATE_NONE;
82 // Handler of incoming messages from clients.
83 static class IncomingHandler extends Handler {
84 private final WeakReference<TelemetryService> service;
85 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
88 public void handleMessage(Message msg) {
89 TelemetryService s = service.get();
91 case MSG_REGISTER_CLIENT:
92 s.mClients.add(msg.replyTo);
94 // Now we try to send the freshly connected UI any relavant information about what
95 // we're talking to - Basically state and Config Data.
96 msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, s.state, -1, s.mConfigData));
97 } catch (RemoteException e) {
98 s.mClients.remove(msg.replyTo);
100 if (D) Log.d(TAG, "Client bound to service");
102 case MSG_UNREGISTER_CLIENT:
103 s.mClients.remove(msg.replyTo);
104 if (D) Log.d(TAG, "Client unbound from service");
107 if (D) Log.d(TAG, "Connect command received");
108 s.device = (BluetoothDevice) msg.obj;
109 s.startAltosBluetooth();
112 if (D) Log.d(TAG, "Connected to device");
115 case MSG_CONNECT_FAILED:
116 if (D) Log.d(TAG, "Connection failed... retrying");
117 s.startAltosBluetooth();
119 case MSG_DISCONNECTED:
120 // Only do the following if we haven't been shutdown elsewhere..
121 if (s.device != null) {
122 if (D) Log.d(TAG, "Disconnected from " + s.device.getName());
123 s.stopAltosBluetooth();
127 s.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_TELEMETRY, msg.obj));
130 super.handleMessage(msg);
135 private void sendMessageToClients(Message m) {
136 for (int i=mClients.size()-1; i>=0; i--) {
138 mClients.get(i).send(m);
139 } catch (RemoteException e) {
145 private void stopAltosBluetooth() {
146 if (D) Log.d(TAG, "stopAltosBluetooth(): begin");
147 setState(STATE_READY);
148 if (mTelemetryReader != null) {
149 if (D) Log.d(TAG, "stopAltosBluetooth(): stopping TelemetryReader");
150 mTelemetryReader.interrupt();
152 mTelemetryReader.join();
153 } catch (InterruptedException e) {
155 mTelemetryReader = null;
157 if (mAltosBluetooth != null) {
158 if (D) Log.d(TAG, "stopAltosBluetooth(): stopping AltosBluetooth");
159 mAltosBluetooth.close();
160 mAltosBluetooth = null;
166 private void startAltosBluetooth() {
167 if (mAltosBluetooth == null) {
168 if (D) Log.d(TAG, String.format("startAltosBluetooth(): Connecting to %s (%s)", device.getName(), device.getAddress()));
169 mAltosBluetooth = new AltosBluetooth(device, mHandler);
170 setState(STATE_CONNECTING);
172 // This is a bit of a hack - if it appears we're still connected, we treat this as a restart.
173 // So, to give a suitable delay to teardown/bringup, we just schedule a resend of a message
174 // to ourselves in a few seconds time that will ultimately call this method again.
175 // ... then we tear down the existing connection.
176 // We do it this way around so that we don't lose a reference to the device when this method
177 // is called on reception of MSG_CONNECT_FAILED in the handler above.
178 mHandler.sendMessageDelayed(Message.obtain(null, MSG_CONNECT, device), 3000);
179 stopAltosBluetooth();
183 private synchronized void setState(int s) {
184 if (D) Log.d(TAG, "setState(): " + state + " -> " + s);
187 // This shouldn't be required - mConfigData should be null for any non-connected
188 // state, but to be safe and to reduce message size
189 AltosConfigData acd = (state == STATE_CONNECTED) ? mConfigData : null;
191 sendMessageToClients(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, state, -1, acd));
194 private void connected() {
196 mConfigData = mAltosBluetooth.config_data();
197 } catch (InterruptedException e) {
198 } catch (TimeoutException e) {
199 // If this timed out, then we really want to retry it, but
200 // probably safer to just retry the connection from scratch.
201 mHandler.obtainMessage(MSG_CONNECT_FAILED).sendToTarget();
205 setState(STATE_CONNECTED);
207 mTelemetryReader = new TelemetryReader(mAltosBluetooth, mHandler);
208 mTelemetryReader.start();
212 private void onTimerTick() {
213 if (D) Log.d(TAG, "Timer wakeup");
215 if (mClients.size() <= 0 && state != STATE_CONNECTED) {
218 } catch (Throwable t) {
219 Log.e(TAG, "Timer failed: ", t);
225 public void onCreate() {
226 // Create a reference to the NotificationManager so that we can update our notifcation text later
227 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
229 setState(STATE_READY);
231 // Start our timer - first event in 10 seconds, then every 10 seconds after that.
232 timer.scheduleAtFixedRate(new TimerTask(){ public void run() {onTimerTick();}}, 10000L, 10000L);
237 public int onStartCommand(Intent intent, int flags, int startId) {
238 Log.i("TelemetryService", "Received start id " + startId + ": " + intent);
240 CharSequence text = getText(R.string.telemetry_service_started);
242 // Create notification to be displayed while the service runs
243 Notification notification = new Notification(R.drawable.am_status_c, text, 0);
245 // The PendingIntent to launch our activity if the user selects this notification
246 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
247 new Intent(this, AltosDroid.class), 0);
249 // Set the info for the views that show in the notification panel.
250 notification.setLatestEventInfo(this, getText(R.string.telemetry_service_label), text, contentIntent);
252 // Set the notification to be in the "Ongoing" section.
253 notification.flags |= Notification.FLAG_ONGOING_EVENT;
255 // Move us into the foreground.
256 startForeground(NOTIFICATION, notification);
258 // We want this service to continue running until it is explicitly
259 // stopped, so return sticky.
264 public void onDestroy() {
266 // Stop the bluetooth Comms threads
267 stopAltosBluetooth();
269 // Demote us from the foreground, and cancel the persistent notification.
270 stopForeground(true);
273 if (timer != null) {timer.cancel();}
275 // Tell the user we stopped.
276 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
280 public IBinder onBind(Intent intent) {
281 return mMessenger.getBinder();