uk.ac.horizon.ubihelper.service.channel.BluetoothDiscoveryChannel.java Source code

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Here is the source code for uk.ac.horizon.ubihelper.service.channel.BluetoothDiscoveryChannel.java

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/**
 * Copyright (c) 2012 The University of Nottingham
 * 
 * This file is part of ubihelper
 *
 *  ubihelper is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  ubihelper 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with ubihelper. If not, see <http://www.gnu.org/licenses/>.
 *  
 *  @author Chris Greenhalgh (cmg@cs.nott.ac.uk), The University of Nottingham
 */
package uk.ac.horizon.ubihelper.service.channel;

import java.util.HashMap;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothClass;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Handler;
import android.util.Log;

/**
 * @author cmg
 *
 */
public class BluetoothDiscoveryChannel extends PollingChannel {
    private static final String KEY_TIME = "time";
    private static final String KEY_DEVICES = "devices";
    private static final String KEY_ADDRESS = "btaddress";
    private static final String KEY_CLASS = "btclass";
    private static final String KEY_NAME = "name";
    private static final String KEY_BOND = "bond";

    static String TAG = "ubihelper-btchan";
    private BluetoothAdapter bluetooth;
    private Service service;
    private HashMap<String, BluetoothDevice> devices = new HashMap<String, BluetoothDevice>();

    /**
     * @param handler
     * @param name
     */
    public BluetoothDiscoveryChannel(Service service, Handler handler, String name) {
        super(handler, name);
        bluetooth = BluetoothAdapter.getDefaultAdapter();
        this.service = service;
        if (bluetooth == null)
            Log.w(TAG, "No BluetoothAdapter");
        if (!bluetooth.isEnabled()) {
            Intent i = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            service.sendBroadcast(i);
        }
        IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
        filter.addAction(BluetoothDevice.ACTION_FOUND);
        filter.addAction(BluetoothDevice.ACTION_NAME_CHANGED);
        this.service.registerReceiver(receiver, filter);
    }

    @Override
    public synchronized void close() {
        super.close();
        service.unregisterReceiver(receiver);
    }

    private BroadcastReceiver receiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(intent.getAction())) {
                handlePollComplete();
            } else if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(intent.getAction())) {
                // turned off?
                if (!bluetooth.isDiscovering())
                    synchronized (BluetoothDiscoveryChannel.this) {
                        if (pollInProgress)
                            pollComplete();
                    }
            } else if (BluetoothDevice.ACTION_FOUND.equals(intent.getAction())
                    || BluetoothDevice.ACTION_NAME_CHANGED.equals(intent.getAction())) {
                try {
                    BluetoothDevice device = intent.getExtras().getParcelable(BluetoothDevice.EXTRA_DEVICE);
                    if (device != null) {
                        String address = device.getAddress();
                        Log.d(TAG, "Found device " + address);
                        synchronized (BluetoothDiscoveryChannel.this) {
                            devices.put(address, device);
                        }
                    }
                } catch (Exception e) {
                    Log.w(TAG, "Error getting device: " + e);
                }
            }
        }
    };

    @Override
    protected boolean startPoll() {
        if (bluetooth == null) {
            return false;
        }
        if (!bluetooth.isEnabled()) {
            Log.d(TAG, "startPoll: Bluetooth disabled");
            return false;
        }
        if (bluetooth.isDiscovering()) {
            Log.d(TAG, "startPoll: already isDiscovering");
            return true;
        }
        synchronized (this) {
            devices.clear();
        }
        if (!bluetooth.startDiscovery()) {
            Log.d(TAG, "startPoll: could not startDiscovery");
            return false;
        }
        return true;
    }

    protected synchronized void handlePollComplete() {
        if (pollInProgress)
            pollComplete();
        try {
            JSONObject value = new JSONObject();
            value.put(KEY_TIME, System.currentTimeMillis());
            String btname = bluetooth.getName();
            String btaddress = bluetooth.getAddress();
            if (btname != null)
                value.put(KEY_NAME, btname);
            if (btaddress != null)
                value.put(KEY_ADDRESS, btaddress);
            JSONArray ds = new JSONArray();
            value.put(KEY_DEVICES, ds);
            for (BluetoothDevice device : this.devices.values()) {
                JSONObject d = new JSONObject();
                d.put(KEY_ADDRESS, device.getAddress());
                BluetoothClass btclass = device.getBluetoothClass();
                if (btclass != null)
                    d.put(KEY_CLASS, btclass.getDeviceClass());
                String name = device.getName();
                if (name != null)
                    d.put(KEY_NAME, name);
                d.put(KEY_BOND, device.getBondState());
                ds.put(d);
            }
            onNewValue(value);
        } catch (JSONException e) {
            // shouldn't
        }
    }

}