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   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 import java.util.concurrent.LinkedBlockingQueue;
  23
  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;
  38
  39 import org.altusmetrum.AltosLib.*;
  40
  41 public class TelemetryService extends Service {
  42
  43         private static final String TAG = "TelemetryService";
  44         private static final boolean D = true;
  45
  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
  51         public static final int STATE_NONE       = 0;
  52         public static final int STATE_READY      = 1;
  53         public static final int STATE_CONNECTING = 2;
  54         public static final int STATE_CONNECTED  = 3;
  55
  56         // Key names received from the TelemetryService Handler
  57         public static final String KEY_DEVNAME = "key_devname";
  58         public static final String KEY_TOAST   = "key_toast";
  59
  60         // Unique Identification Number for the Notification.
  61         // We use it on Notification start, and to cancel it.
  62         private int NOTIFICATION = R.string.telemetry_service_label;
  63         //private NotificationManager mNM;
  64
  65         ArrayList<Messenger> mClients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
  66         final Handler   mHandler   = new IncomingHandler(this);
  67         final Messenger mMessenger = new Messenger(mHandler); // Target we publish for clients to send messages to IncomingHandler.
  68
  69         // Name of the connected device
  70         private BluetoothDevice device = null;
  71         private AltosBluetooth mAltosBluetooth = null;
  72         private int state = STATE_NONE;
  73         LinkedBlockingQueue<AltosLine> telem;
  74
  75         // Handler of incoming messages from clients.
  76         static class IncomingHandler extends Handler {
  77                 private final WeakReference<TelemetryService> service;
  78                 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
  79
  80                 @Override
  81                 public void handleMessage(Message msg) {
  82                         TelemetryService s = service.get();
  83                         switch (msg.what) {
  84                         case MSG_REGISTER_CLIENT:
  85                                 s.mClients.add(msg.replyTo);
  86                                 try {
  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.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_DEVNAME, s.device.getName()));
 105                                 s.setState(STATE_CONNECTED);
 106                                 s.mAltosBluetooth.add_monitor(s.telem);
 107                                 break;
 108                         default:
 109                                 super.handleMessage(msg);
 110                         }
 111                 }
 112         }
 113
 114         private void sendMessageToClients(Message m) {
 115                 for (int i=mClients.size()-1; i>=0; i--) {
 116                         try {
 117                                 mClients.get(i).send(m);
 118                         } catch (RemoteException e) {
 119                                 mClients.remove(i);
 120                         }
 121                 }
 122         }
 123
 124         private void stopAltosBluetooth() {
 125                 if (D) Log.i(TAG, "Stopping BT");
 126                 setState(STATE_READY);
 127                 if (mAltosBluetooth != null) {
 128                         if (D) Log.i(TAG, "Closing AltosBluetooth");
 129                         mAltosBluetooth.close();
 130                         mAltosBluetooth = null;
 131                 }
 132                 device = null;
 133                 telem.clear();
 134         }
 135
 136         private void startAltosBluetooth() {
 137                 if (mAltosBluetooth == null) {
 138                         if (D) Log.i(TAG, "Connecting to " + device.getName());
 139                         mAltosBluetooth = new AltosBluetooth(device, mHandler);
 140                         setState(STATE_CONNECTING);
 141                 } else {
 142                         stopAltosBluetooth();
 143                         mHandler.sendMessageDelayed(Message.obtain(null, MSG_CONNECT, device), 1000);
 144                 }
 145         }
 146
 147         private synchronized void setState(int s) {
 148                 if (D) Log.d(TAG, "setState() " + state + " -> " + s);
 149                 state = s;
 150
 151                 sendMessageToClients(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, state, -1));
 152         }
 153
 154         @Override
 155         public void onCreate() {
 156                 // Create a reference to the NotificationManager so that we can update our notifcation text later
 157                 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
 158
 159                 telem = new LinkedBlockingQueue<AltosLine>();
 160                 setState(STATE_READY);
 161         }
 162
 163         @Override
 164         public int onStartCommand(Intent intent, int flags, int startId) {
 165                 Log.i("TelemetryService", "Received start id " + startId + ": " + intent);
 166
 167                 CharSequence text = getText(R.string.telemetry_service_started);
 168
 169                 // Create notification to be displayed while the service runs
 170                 Notification notification = new Notification(R.drawable.am_status_c, text, 0);
 171
 172                 // The PendingIntent to launch our activity if the user selects this notification
 173                 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
 174                                 new Intent(this, AltosDroid.class), 0);
 175
 176                 // Set the info for the views that show in the notification panel.
 177                 notification.setLatestEventInfo(this, getText(R.string.telemetry_service_label), text, contentIntent);
 178
 179                 // Set the notification to be in the "Ongoing" section.
 180                 notification.flags |= Notification.FLAG_ONGOING_EVENT;
 181
 182                 // Move us into the foreground.
 183                 startForeground(NOTIFICATION, notification);
 184
 185                 // We want this service to continue running until it is explicitly
 186                 // stopped, so return sticky.
 187                 return START_STICKY;
 188         }
 189
 190         @Override
 191         public void onDestroy() {
 192
 193                 // Stop the bluetooth Comms threads
 194                 stopAltosBluetooth();
 195
 196                 // Demote us from the foreground, and cancel the persistent notification.
 197                 stopForeground(true);
 198
 199                 // Tell the user we stopped.
 200                 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
 201         }
 202
 203         @Override
 204         public IBinder onBind(Intent intent) {
 205                 return mMessenger.getBinder();
 206         }
 207
 208
 209 }