/**
*
* Funf: Open Sensing Framework
* Copyright (C) 2010-2011 Nadav Aharony, Wei Pan, Alex Pentland.
* Acknowledgments: Alan Gardner
* Contact: nadav@media.mit.edu
*
* This file is part of Funf.
*
* Funf is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* Funf is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Funf. If not, see <http://www.gnu.org/licenses/>.
*
*/
package edu.mit.media.funf.probe.builtin;
import java.math.BigDecimal;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import edu.mit.media.funf.Schedule;
import edu.mit.media.funf.Schedule.DefaultSchedule;
import edu.mit.media.funf.config.Configurable;
import edu.mit.media.funf.probe.Probe.Base;
import edu.mit.media.funf.probe.Probe.DisplayName;
import edu.mit.media.funf.probe.Probe.PassiveProbe;
import edu.mit.media.funf.probe.Probe.RequiredFeatures;
import edu.mit.media.funf.probe.Probe.RequiredPermissions;
import edu.mit.media.funf.time.TimeUtil;
@DisplayName("Nearby Bluetooth Devices Probe")
@Schedule.DefaultSchedule(interval=300)
@RequiredFeatures("android.hardware.bluetooth")
@RequiredPermissions({android.Manifest.permission.BLUETOOTH, android.Manifest.permission.BLUETOOTH_ADMIN})
public class BluetoothProbe extends Base implements PassiveProbe {
@Configurable
private BigDecimal maxScanTime = BigDecimal.valueOf(30.0);
private BluetoothAdapter adapter;
private BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(BluetoothDevice.ACTION_FOUND)) {
sendData(getGson().toJsonTree(intent.getExtras()).getAsJsonObject());
} else if (action.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)) {
stop();
}
}
};
private BroadcastReceiver stateChangedReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
int newState = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.STATE_OFF);
if (newState == BluetoothAdapter.STATE_ON) {
try {
getContext().unregisterReceiver(this);
startDiscovery();
} catch (IllegalArgumentException e) {
// Already called this code, or probe has stopped
}
}
}
};
private boolean shouldDisableOnFinish = false; // Keeps track of previous bluetooth state
private void startDiscovery() {
if (adapter.isEnabled()) {
adapter.startDiscovery();
} else {
shouldDisableOnFinish = true;
getContext().registerReceiver(stateChangedReceiver, new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));
adapter.enable();
}
}
@Override
protected void onEnable() {
adapter = BluetoothAdapter.getDefaultAdapter();
IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
getContext().registerReceiver(receiver, intentFilter);
}
@Override
protected void onStart() {
super.onStart();
startDiscovery();
if (maxScanTime != null) {
getHandler().sendMessageDelayed(getHandler().obtainMessage(STOP_MESSAGE), TimeUtil.secondsToMillis(maxScanTime));
}
}
@Override
protected void onStop() {
super.onStop();
getHandler().removeMessages(STOP_MESSAGE);
try {
getContext().unregisterReceiver(stateChangedReceiver);
} catch (IllegalArgumentException e) {
// Previously stopped
}
if (adapter.isDiscovering()) {
adapter.cancelDiscovery();
}
if (shouldDisableOnFinish) {
adapter.disable();
shouldDisableOnFinish = false;
}
}
@Override
protected void onDisable() {
getContext().unregisterReceiver(receiver);
}
}