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;
55 static final int MSG_SETFREQUENCY = 8;
57 public static final int STATE_NONE = 0;
58 public static final int STATE_READY = 1;
59 public static final int STATE_CONNECTING = 2;
60 public static final int STATE_CONNECTED = 3;
62 // Unique Identification Number for the Notification.
63 // We use it on Notification start, and to cancel it.
64 private int NOTIFICATION = R.string.telemetry_service_label;
65 //private NotificationManager mNM;
67 // Timer - we wake up every now and then to decide if the service should stop
68 private Timer timer = new Timer();
70 ArrayList<Messenger> mClients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
71 final Handler mHandler = new IncomingHandler(this);
72 final Messenger mMessenger = new Messenger(mHandler); // Target we publish for clients to send messages to IncomingHandler.
74 // Name of the connected device
75 private BluetoothDevice device = null;
76 private AltosBluetooth mAltosBluetooth = null;
77 private AltosConfigData mConfigData = null;
78 private TelemetryReader mTelemetryReader = null;
80 // internally track state of bluetooth connection
81 private int state = STATE_NONE;
83 // Handler of incoming messages from clients.
84 static class IncomingHandler extends Handler {
85 private final WeakReference<TelemetryService> service;
86 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
89 public void handleMessage(Message msg) {
90 TelemetryService s = service.get();
92 case MSG_REGISTER_CLIENT:
93 s.mClients.add(msg.replyTo);
95 // Now we try to send the freshly connected UI any relavant information about what
96 // we're talking to - Basically state and Config Data.
97 msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, s.state, -1, s.mConfigData));
98 } catch (RemoteException e) {
99 s.mClients.remove(msg.replyTo);
101 if (D) Log.d(TAG, "Client bound to service");
103 case MSG_UNREGISTER_CLIENT:
104 s.mClients.remove(msg.replyTo);
105 if (D) Log.d(TAG, "Client unbound from service");
108 if (D) Log.d(TAG, "Connect command received");
109 s.device = (BluetoothDevice) msg.obj;
110 s.startAltosBluetooth();
113 if (D) Log.d(TAG, "Connected to device");
116 case MSG_CONNECT_FAILED:
117 if (D) Log.d(TAG, "Connection failed... retrying");
118 s.startAltosBluetooth();
120 case MSG_DISCONNECTED:
121 // Only do the following if we haven't been shutdown elsewhere..
122 if (s.device != null) {
123 if (D) Log.d(TAG, "Disconnected from " + s.device.getName());
124 s.stopAltosBluetooth();
128 s.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_TELEMETRY, msg.obj));
130 case MSG_SETFREQUENCY:
131 if (s.state == STATE_CONNECTED) {
133 s.mAltosBluetooth.set_radio_frequency((Double) msg.obj);
134 } catch (InterruptedException e) {
135 } catch (TimeoutException e) {
140 super.handleMessage(msg);
145 private void sendMessageToClients(Message m) {
146 for (int i=mClients.size()-1; i>=0; i--) {
148 mClients.get(i).send(m);
149 } catch (RemoteException e) {
155 private void stopAltosBluetooth() {
156 if (D) Log.d(TAG, "stopAltosBluetooth(): begin");
157 setState(STATE_READY);
158 if (mTelemetryReader != null) {
159 if (D) Log.d(TAG, "stopAltosBluetooth(): stopping TelemetryReader");
160 mTelemetryReader.interrupt();
162 mTelemetryReader.join();
163 } catch (InterruptedException e) {
165 mTelemetryReader = null;
167 if (mAltosBluetooth != null) {
168 if (D) Log.d(TAG, "stopAltosBluetooth(): stopping AltosBluetooth");
169 mAltosBluetooth.close();
170 mAltosBluetooth = null;
176 private void startAltosBluetooth() {
177 if (mAltosBluetooth == null) {
178 if (D) Log.d(TAG, String.format("startAltosBluetooth(): Connecting to %s (%s)", device.getName(), device.getAddress()));
179 mAltosBluetooth = new AltosBluetooth(device, mHandler);
180 setState(STATE_CONNECTING);
182 // This is a bit of a hack - if it appears we're still connected, we treat this as a restart.
183 // So, to give a suitable delay to teardown/bringup, we just schedule a resend of a message
184 // to ourselves in a few seconds time that will ultimately call this method again.
185 // ... then we tear down the existing connection.
186 // We do it this way around so that we don't lose a reference to the device when this method
187 // is called on reception of MSG_CONNECT_FAILED in the handler above.
188 mHandler.sendMessageDelayed(Message.obtain(null, MSG_CONNECT, device), 3000);
189 stopAltosBluetooth();
193 private synchronized void setState(int s) {
194 if (D) Log.d(TAG, "setState(): " + state + " -> " + s);
197 // This shouldn't be required - mConfigData should be null for any non-connected
198 // state, but to be safe and to reduce message size
199 AltosConfigData acd = (state == STATE_CONNECTED) ? mConfigData : null;
201 sendMessageToClients(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, state, -1, acd));
204 private void connected() {
206 mConfigData = mAltosBluetooth.config_data();
207 } catch (InterruptedException e) {
208 } catch (TimeoutException e) {
209 // If this timed out, then we really want to retry it, but
210 // probably safer to just retry the connection from scratch.
211 mHandler.obtainMessage(MSG_CONNECT_FAILED).sendToTarget();
215 setState(STATE_CONNECTED);
217 mTelemetryReader = new TelemetryReader(mAltosBluetooth, mHandler);
218 mTelemetryReader.start();
222 private void onTimerTick() {
223 if (D) Log.d(TAG, "Timer wakeup");
225 if (mClients.size() <= 0 && state != STATE_CONNECTED) {
228 } catch (Throwable t) {
229 Log.e(TAG, "Timer failed: ", t);
235 public void onCreate() {
236 // Create a reference to the NotificationManager so that we can update our notifcation text later
237 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
239 setState(STATE_READY);
241 // Start our timer - first event in 10 seconds, then every 10 seconds after that.
242 timer.scheduleAtFixedRate(new TimerTask(){ public void run() {onTimerTick();}}, 10000L, 10000L);
247 public int onStartCommand(Intent intent, int flags, int startId) {
248 Log.i("TelemetryService", "Received start id " + startId + ": " + intent);
250 CharSequence text = getText(R.string.telemetry_service_started);
252 // Create notification to be displayed while the service runs
253 Notification notification = new Notification(R.drawable.am_status_c, text, 0);
255 // The PendingIntent to launch our activity if the user selects this notification
256 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
257 new Intent(this, AltosDroid.class), 0);
259 // Set the info for the views that show in the notification panel.
260 notification.setLatestEventInfo(this, getText(R.string.telemetry_service_label), text, contentIntent);
262 // Set the notification to be in the "Ongoing" section.
263 notification.flags |= Notification.FLAG_ONGOING_EVENT;
265 // Move us into the foreground.
266 startForeground(NOTIFICATION, notification);
268 // We want this service to continue running until it is explicitly
269 // stopped, so return sticky.
274 public void onDestroy() {
276 // Stop the bluetooth Comms threads
277 stopAltosBluetooth();
279 // Demote us from the foreground, and cancel the persistent notification.
280 stopForeground(true);
283 if (timer != null) {timer.cancel();}
285 // Tell the user we stopped.
286 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
290 public IBinder onBind(Intent intent) {
291 return mMessenger.getBinder();