Android Open Source - ubihelper Bluetooth Discovery Channel

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From Project

Back to project page ubihelper.

License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Copyright (c) 2012 The University of Nottingham
 * /*  w  ww.jav a  2s .c o  m*/
 * 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
    }
  }

}

Java Source Code List

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