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;
24 import android.app.Notification;
25 //import android.app.NotificationManager;
26 import android.app.PendingIntent;
27 import android.app.Service;
28 import android.bluetooth.BluetoothDevice;
29 import android.content.Intent;
30 //import android.os.Bundle;
31 import android.os.IBinder;
32 import android.os.Handler;
33 import android.os.Message;
34 import android.os.Messenger;
35 import android.os.RemoteException;
36 import android.util.Log;
37 import android.widget.Toast;
39 import org.altusmetrum.AltosLib.*;
41 public class TelemetryService extends Service {
43 private static final String TAG = "TelemetryService";
44 private static final boolean D = true;
46 static final int MSG_REGISTER_CLIENT = 1;
47 static final int MSG_UNREGISTER_CLIENT = 2;
48 static final int MSG_CONNECT = 3;
49 static final int MSG_CONNECTED = 4;
50 static final int MSG_CONNECT_FAILED = 5;
51 static final int MSG_DISCONNECTED = 6;
52 static final int MSG_TELEMETRY = 7;
54 public static final int STATE_NONE = 0;
55 public static final int STATE_READY = 1;
56 public static final int STATE_CONNECTING = 2;
57 public static final int STATE_CONNECTED = 3;
59 // Unique Identification Number for the Notification.
60 // We use it on Notification start, and to cancel it.
61 private int NOTIFICATION = R.string.telemetry_service_label;
62 //private NotificationManager mNM;
64 ArrayList<Messenger> mClients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
65 final Handler mHandler = new IncomingHandler(this);
66 final Messenger mMessenger = new Messenger(mHandler); // Target we publish for clients to send messages to IncomingHandler.
68 // Name of the connected device
69 private BluetoothDevice device = null;
70 private AltosBluetooth mAltosBluetooth = null;
71 private AltosConfigData mConfigData = null;
72 private TelemetryReader mTelemetryReader = null;
74 // internally track state of bluetooth connection
75 private int state = STATE_NONE;
77 // Handler of incoming messages from clients.
78 static class IncomingHandler extends Handler {
79 private final WeakReference<TelemetryService> service;
80 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
83 public void handleMessage(Message msg) {
84 TelemetryService s = service.get();
86 case MSG_REGISTER_CLIENT:
87 s.mClients.add(msg.replyTo);
89 // Now we try to send the freshly connected UI any relavant information about what
90 // we're talking to - Basically state and Config Data.
91 msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, s.state, -1, s.mConfigData));
92 } catch (RemoteException e) {
93 s.mClients.remove(msg.replyTo);
95 if (D) Log.d(TAG, "Client bound to service");
97 case MSG_UNREGISTER_CLIENT:
98 s.mClients.remove(msg.replyTo);
99 if (D) Log.d(TAG, "Client unbound from service");
102 if (D) Log.d(TAG, "Connect command received");
103 s.device = (BluetoothDevice) msg.obj;
104 s.startAltosBluetooth();
107 if (D) Log.d(TAG, "Connected to device");
110 case MSG_CONNECT_FAILED:
111 if (D) Log.d(TAG, "Connection failed... retrying");
112 s.startAltosBluetooth();
114 case MSG_DISCONNECTED:
115 // Only do the following if we haven't been shutdown elsewhere..
116 if (s.device != null) {
117 if (D) Log.d(TAG, "Disconnected from " + s.device.getName());
118 s.stopAltosBluetooth();
122 s.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_TELEMETRY, msg.obj));
125 super.handleMessage(msg);
130 private void sendMessageToClients(Message m) {
131 for (int i=mClients.size()-1; i>=0; i--) {
133 mClients.get(i).send(m);
134 } catch (RemoteException e) {
140 private void stopAltosBluetooth() {
141 if (D) Log.d(TAG, "stopAltosBluetooth(): begin");
142 setState(STATE_READY);
143 if (mTelemetryReader != null) {
144 if (D) Log.d(TAG, "stopAltosBluetooth(): stopping TelemetryReader");
145 mTelemetryReader.interrupt();
147 mTelemetryReader.join();
148 } catch (InterruptedException e) {
150 mTelemetryReader = null;
152 if (mAltosBluetooth != null) {
153 if (D) Log.d(TAG, "stopAltosBluetooth(): stopping AltosBluetooth");
154 mAltosBluetooth.close();
155 mAltosBluetooth = null;
161 private void startAltosBluetooth() {
162 if (mAltosBluetooth == null) {
163 if (D) Log.d(TAG, String.format("startAltosBluetooth(): Connecting to %s (%s)", device.getName(), device.getAddress()));
164 mAltosBluetooth = new AltosBluetooth(device, mHandler);
165 setState(STATE_CONNECTING);
167 // This is a bit of a hack - if it appears we're still connected, we treat this as a restart.
168 // So, to give a suitable delay to teardown/bringup, we just schedule a resend of a message
169 // to ourselves in a few seconds time that will ultimately call this method again.
170 // ... then we tear down the existing connection.
171 // We do it this way around so that we don't lose a reference to the device when this method
172 // is called on reception of MSG_CONNECT_FAILED in the handler above.
173 mHandler.sendMessageDelayed(Message.obtain(null, MSG_CONNECT, device), 3000);
174 stopAltosBluetooth();
178 private synchronized void setState(int s) {
179 if (D) Log.d(TAG, "setState(): " + state + " -> " + s);
182 // This shouldn't be required - mConfigData should be null for any non-connected
183 // state, but to be safe and to reduce message size
184 AltosConfigData acd = (state == STATE_CONNECTED) ? mConfigData : null;
186 sendMessageToClients(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, state, -1, acd));
189 private void connected() {
191 mConfigData = mAltosBluetooth.config_data();
192 } catch (InterruptedException e) {
193 } catch (TimeoutException e) {
194 // If this timed out, then we really want to retry it, but
195 // probably safer to just retry the connection from scratch.
196 mHandler.obtainMessage(MSG_CONNECT_FAILED).sendToTarget();
200 setState(STATE_CONNECTED);
202 mTelemetryReader = new TelemetryReader(mAltosBluetooth, mHandler);
203 mTelemetryReader.start();
208 public void onCreate() {
209 // Create a reference to the NotificationManager so that we can update our notifcation text later
210 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
212 setState(STATE_READY);
216 public int onStartCommand(Intent intent, int flags, int startId) {
217 Log.i("TelemetryService", "Received start id " + startId + ": " + intent);
219 CharSequence text = getText(R.string.telemetry_service_started);
221 // Create notification to be displayed while the service runs
222 Notification notification = new Notification(R.drawable.am_status_c, text, 0);
224 // The PendingIntent to launch our activity if the user selects this notification
225 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
226 new Intent(this, AltosDroid.class), 0);
228 // Set the info for the views that show in the notification panel.
229 notification.setLatestEventInfo(this, getText(R.string.telemetry_service_label), text, contentIntent);
231 // Set the notification to be in the "Ongoing" section.
232 notification.flags |= Notification.FLAG_ONGOING_EVENT;
234 // Move us into the foreground.
235 startForeground(NOTIFICATION, notification);
237 // We want this service to continue running until it is explicitly
238 // stopped, so return sticky.
243 public void onDestroy() {
245 // Stop the bluetooth Comms threads
246 stopAltosBluetooth();
248 // Demote us from the foreground, and cancel the persistent notification.
249 stopForeground(true);
251 // Tell the user we stopped.
252 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
256 public IBinder onBind(Intent intent) {
257 return mMessenger.getBinder();