Android Open Source - Fast Hxm Bluetooth Helper

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.example.fast.heart;
//w w  w  .  j  a  v a 2 s . co m
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Set;

import zephyr.android.HxMBT.BTClient;
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 android.os.Bundle;
import android.os.Handler;
import android.util.Log;


/**
 * Used for the heartrate monitors.  Borrowed heavily from the heartrate lab.
 *
 */
public class HxmBluetoothHelper
{
  public static final int MESSAGE_HEART_RATE    = 0x0100;
  public static final int MESSAGE_INSTANT_SPEED = 0x0101;
  
  public static final int MESSAGE_BATTERY = 0x0110;
  public static final String DATA_BATTERY = "com.example.btheartrate.data.battery";
  
  public static final String DATA_HEART_RATE    = "com.example.btheartrate.data.heart_rate";
  public static final String DATA_INSTANT_SPEED = "com.example.btheartrate.data.instant_speed";
  
  private static final String BIO_HARNESS_MAC = "00:07:80:9D:8A:E8";
  private static final String BIO_HARNESS_PIN = "1234";
  
  private static final String HXM_PREFIX = "HXM";

  private Context context;
  private Handler handler;

  private BluetoothAdapter adapter;

  private BTClient btClient;
  private ConnectedListener connectedListener;

  public HxmBluetoothHelper(Context context, Handler handler)
  {
    adapter = BluetoothAdapter.getDefaultAdapter();

    this.context = context;
    this.handler = handler;
    
    registerReceivers();
  }

  private void registerReceivers()
  {
    // Sending a message to android that we are going to initiate a pairing request
    IntentFilter pairingRequestFilter = new IntentFilter("android.bluetooth.device.action.PAIRING_REQUEST");
    // Registering a new BTBroadcast receiver from the Main Activity context with pairing request event
    context.getApplicationContext().registerReceiver(new PairingRequestReceiver(), pairingRequestFilter);

    // Registering the BTBondReceiver in the application that the status of the receiver has changed to Paired
    IntentFilter bondStateChangedReceiver = new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
    context.getApplicationContext().registerReceiver(new BondStateReceiver(), bondStateChangedReceiver);
  }

  public boolean connect()
  {  
    if(adapter == null) return false;
    
    BluetoothDevice hxmDevice = findHxmDevice(adapter);

    btClient = new BTClient(adapter, hxmDevice.getAddress());
    connectedListener = new ConnectedListener(handler);
    btClient.addConnectedEventListener(connectedListener);
    
    if(btClient.IsConnected())
    {
      btClient.start();
      return true;
    }

    return false;
  }

  private BluetoothDevice findHxmDevice(BluetoothAdapter adapter)
  {
    Set<BluetoothDevice> pairedDevices = adapter.getBondedDevices();

    for (BluetoothDevice device : pairedDevices)
    {
      if (device.getName().startsWith(HXM_PREFIX))
      {
        return device;
      }
    }

    return adapter.getRemoteDevice(BIO_HARNESS_MAC);
  }
  
  public BluetoothDevice getDevice()
  {
    if(btClient != null)
    {
      return btClient.getDevice();
    }
    
    return null;
  }
  
  public boolean isConnected()
  {
    if(btClient != null)
    {
      return btClient.IsConnected();
    }
    
    return false;
  }
  
  public void disconnect()
  {
    // This disconnects listener from acting on received messages
    btClient.removeConnectedEventListener(connectedListener);
    // Close the communication with the device and throw an exception if failure
    btClient.Close();
  }

  private class BondStateReceiver extends BroadcastReceiver
  {
    @Override
    public void onReceive(Context context, Intent intent)
    {
      Bundle extras = intent.getExtras();
      Log.d("HeartMonitor", "Bond State: " + extras.getInt(BluetoothDevice.EXTRA_BOND_STATE));
    }
  }

  private class PairingRequestReceiver extends BroadcastReceiver
  {
    @Override
    public void onReceive(Context context, Intent intent)
    {
      Bundle extras = intent.getExtras();
      
      Log.d("PairingRequest", intent.getAction());
      Log.d("PairingRequest", extras.get(BluetoothDevice.EXTRA_DEVICE).toString());
      Log.d("PairingRequest", extras.get("android.bluetooth.device.extra.PAIRING_VARIANT").toString());
      
      try
      {
        BluetoothDevice device = adapter.getRemoteDevice(extras.get(BluetoothDevice.EXTRA_DEVICE).toString());
        Method m = BluetoothDevice.class.getMethod("convertPinToBytes", new Class[] {String.class} );
        byte[] pin = (byte[]) m.invoke(device, BIO_HARNESS_PIN);
        m = device.getClass().getMethod("setPin", new Class[] { pin.getClass() });
        Object result = m.invoke(device, pin);
        Log.d("PairingRequest", result.toString());
      }
      catch (SecurityException         e) { e.printStackTrace(); }
      catch (NoSuchMethodException     e) { e.printStackTrace(); }
      catch (IllegalArgumentException  e) { e.printStackTrace(); }
      catch (IllegalAccessException    e) { e.printStackTrace(); }
      catch (InvocationTargetException e) { e.printStackTrace(); }
    }
  }
}

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