git.gag.com Git - fw/altos/blob - altosdroid/src/org/altusmetrum/AltosDroid/TelemetryService.java

   1 /*
   2  * Copyright © 2012 Mike Beattie <mike@ethernal.org>
   3  *
   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.
   7  *
   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.
  12  *
  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.
  16  */
  17
  18 package org.altusmetrum.AltosDroid;
  19
  20 import java.lang.ref.WeakReference;
  21 import java.util.ArrayList;
  22
  23 import android.app.Notification;
  24 //import android.app.NotificationManager;
  25 import android.app.PendingIntent;
  26 import android.app.Service;
  27 import android.bluetooth.BluetoothDevice;
  28 import android.content.Intent;
  29 //import android.os.Bundle;
  30 import android.os.IBinder;
  31 import android.os.Handler;
  32 import android.os.Message;
  33 import android.os.Messenger;
  34 import android.os.RemoteException;
  35 import android.util.Log;
  36 import android.widget.Toast;
  37
  38 //import org.altusmetrum.AltosLib.*;
  39
  40 public class TelemetryService extends Service {
  41
  42         private static final String TAG = "TelemetryService";
  43         private static final boolean D = true;
  44
  45         static final int MSG_REGISTER_CLIENT   = 1;
  46         static final int MSG_UNREGISTER_CLIENT = 2;
  47         static final int MSG_CONNECT           = 3;
  48         static final int MSG_CONNECTED         = 4;
  49         static final int MSG_CONNECT_FAILED    = 5;
  50         static final int MSG_DISCONNECTED      = 6;
  51         static final int MSG_TELEMETRY         = 7;
  52
  53         public static final int STATE_NONE       = 0;
  54         public static final int STATE_READY      = 1;
  55         public static final int STATE_CONNECTING = 2;
  56         public static final int STATE_CONNECTED  = 3;
  57
  58         // Unique Identification Number for the Notification.
  59         // We use it on Notification start, and to cancel it.
  60         private int NOTIFICATION = R.string.telemetry_service_label;
  61         //private NotificationManager mNM;
  62
  63         ArrayList<Messenger> mClients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
  64         final Handler   mHandler   = new IncomingHandler(this);
  65         final Messenger mMessenger = new Messenger(mHandler); // Target we publish for clients to send messages to IncomingHandler.
  66
  67         // Name of the connected device
  68         private BluetoothDevice device = null;
  69         private AltosBluetooth mAltosBluetooth = null;
  70         private TelemetryReader mTelemetryReader = null;
  71
  72         private int state = STATE_NONE;
  73
  74         // Handler of incoming messages from clients.
  75         static class IncomingHandler extends Handler {
  76                 private final WeakReference<TelemetryService> service;
  77                 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
  78
  79                 @Override
  80                 public void handleMessage(Message msg) {
  81                         TelemetryService s = service.get();
  82                         switch (msg.what) {
  83                         case MSG_REGISTER_CLIENT:
  84                                 s.mClients.add(msg.replyTo);
  85                                 try {
  86                                         msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_DEVNAME, s.device.getName()));
  87                                         msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, s.state, -1));
  88                                 } catch (RemoteException e) {
  89                                         s.mClients.remove(msg.replyTo);
  90                                 }
  91                                 if (D) Log.d(TAG, "Client bound to service");
  92                                 break;
  93                         case MSG_UNREGISTER_CLIENT:
  94                                 s.mClients.remove(msg.replyTo);
  95                                 if (D) Log.d(TAG, "Client unbound from service");
  96                                 break;
  97                         case MSG_CONNECT:
  98                                 if (D) Log.d(TAG, "Connect command received");
  99                                 s.device = (BluetoothDevice) msg.obj;
 100                                 s.startAltosBluetooth();
 101                                 break;
 102                         case MSG_CONNECTED:
 103                                 if (D) Log.d(TAG, "Connected to device");
 104                                 s.connected();
 105                                 break;
 106                         case MSG_CONNECT_FAILED:
 107                                 if (D) Log.d(TAG, "Connection failed... retrying");
 108                                 s.startAltosBluetooth();
 109                                 break;
 110                         case MSG_DISCONNECTED:
 111                                 if (D) Log.d(TAG, "Disconnected from " + s.device.getName());
 112                                 s.stopAltosBluetooth();
 113                                 break;
 114                         case MSG_TELEMETRY:
 115                                 s.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_TELEMETRY, msg.obj));
 116                                 break;
 117                         default:
 118                                 super.handleMessage(msg);
 119                         }
 120                 }
 121         }
 122
 123         private void sendMessageToClients(Message m) {
 124                 for (int i=mClients.size()-1; i>=0; i--) {
 125                         try {
 126                                 mClients.get(i).send(m);
 127                         } catch (RemoteException e) {
 128                                 mClients.remove(i);
 129                         }
 130                 }
 131         }
 132
 133         private void stopAltosBluetooth() {
 134                 if (D) Log.i(TAG, "Stopping BT");
 135                 setState(STATE_READY);
 136                 if (mTelemetryReader != null) {
 137                         mTelemetryReader.interrupt();
 138                         try {
 139                                 mTelemetryReader.join();
 140                         } catch (InterruptedException e) {
 141                         }
 142                         mTelemetryReader = null;
 143                 }
 144                 if (mAltosBluetooth != null) {
 145                         if (D) Log.i(TAG, "Closing AltosBluetooth");
 146                         mAltosBluetooth.close();
 147                         mAltosBluetooth = null;
 148                 }
 149                 device = null;
 150         }
 151
 152         private void startAltosBluetooth() {
 153                 if (mAltosBluetooth == null) {
 154                         if (D) Log.i(TAG, "Connecting to " + device.getName());
 155                         mAltosBluetooth = new AltosBluetooth(device, mHandler);
 156                         setState(STATE_CONNECTING);
 157                 } else {
 158                         stopAltosBluetooth();
 159                         mHandler.sendMessageDelayed(Message.obtain(null, MSG_CONNECT, device), 1000);
 160                 }
 161         }
 162
 163         private synchronized void setState(int s) {
 164                 if (D) Log.d(TAG, "setState() " + state + " -> " + s);
 165                 state = s;
 166
 167                 sendMessageToClients(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, state, -1));
 168         }
 169
 170         private void connected() {
 171                 sendMessageToClients(Message.obtain(null, AltosDroid.MSG_DEVNAME, device.getName()));
 172                 setState(STATE_CONNECTED);
 173                 mTelemetryReader = new TelemetryReader(mAltosBluetooth, mHandler);
 174                 mTelemetryReader.start();
 175         }
 176
 177
 178         @Override
 179         public void onCreate() {
 180                 // Create a reference to the NotificationManager so that we can update our notifcation text later
 181                 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
 182
 183                 setState(STATE_READY);
 184         }
 185
 186         @Override
 187         public int onStartCommand(Intent intent, int flags, int startId) {
 188                 Log.i("TelemetryService", "Received start id " + startId + ": " + intent);
 189
 190                 CharSequence text = getText(R.string.telemetry_service_started);
 191
 192                 // Create notification to be displayed while the service runs
 193                 Notification notification = new Notification(R.drawable.am_status_c, text, 0);
 194
 195                 // The PendingIntent to launch our activity if the user selects this notification
 196                 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
 197                                 new Intent(this, AltosDroid.class), 0);
 198
 199                 // Set the info for the views that show in the notification panel.
 200                 notification.setLatestEventInfo(this, getText(R.string.telemetry_service_label), text, contentIntent);
 201
 202                 // Set the notification to be in the "Ongoing" section.
 203                 notification.flags |= Notification.FLAG_ONGOING_EVENT;
 204
 205                 // Move us into the foreground.
 206                 startForeground(NOTIFICATION, notification);
 207
 208                 // We want this service to continue running until it is explicitly
 209                 // stopped, so return sticky.
 210                 return START_STICKY;
 211         }
 212
 213         @Override
 214         public void onDestroy() {
 215
 216                 // Stop the bluetooth Comms threads
 217                 stopAltosBluetooth();
 218
 219                 // Demote us from the foreground, and cancel the persistent notification.
 220                 stopForeground(true);
 221
 222                 // Tell the user we stopped.
 223                 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
 224         }
 225
 226         @Override
 227         public IBinder onBind(Intent intent) {
 228                 return mMessenger.getBinder();
 229         }
 230
 231
 232 }