Android Open Source - BluetoothPulseMeter Bluetooth Thread

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From Project

Back to project page BluetoothPulseMeter.

License

The source code is released under:

GNU General Public License

Java Source Code

package se.kth.anderssonljung.bluetoothpulsemeter;
/*from w ww.  jav  a 2  s  . c om*/
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

import android.bluetooth.BluetoothSocket;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.TextView;

/**
 * Bluetooth thread which gathers pulse data and stores it to a file
 * 
 * @author Jonas Andersson, Fredrik Ljung
 * 
 */
public class BluetoothThread implements Runnable {
  private static final byte[] FORMAT_8 = { 0x02, 0x70, 0x04, 0x02, 0x08,
      0x00, (byte) 0x7E, 0x03 };
  BluetoothSocket socket;
  File file;
  TextView textview;
  InputStream blueInputStream;
  OutputStream blueOutputStream;
  PrintWriter writer;
  int pulse = 0;
  private boolean running;
  private boolean cancelled;
  private Handler handler;

  public BluetoothThread(BluetoothSocket socket, TextView view,
      File filesdir, Handler handler) {
    running = false;
    this.handler = handler;
    this.socket = socket;
    this.textview = view;
    Random random = new Random();
    DateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
    Date date = new Date();
    System.out.println(dateFormat.format(date));

    file = new File(filesdir, "pulse-" + dateFormat.format(date) + "-"
        + random.nextFloat());
  }

  public void setRunning(boolean running) {
    this.running = running;
  }

  @Override
  public void run() {
    running = true;
    Log.d("ReadBluetooth", "Background thread started");
    try {
      Long startTime = (long) 0;
      socket.connect();
      Log.d("ReadBluetooth", "Connect success");
      blueInputStream = socket.getInputStream();
      blueOutputStream = socket.getOutputStream();

      blueOutputStream.write(FORMAT_8);
      blueOutputStream.flush();
      int response = blueInputStream.read();
      Log.d("ReadBluetooth", "Response: " + response);
      if (response != 6) {
        return;// Did not receive ACK
      }
      writer = new PrintWriter(file);
      byte[] buffer = new byte[4];
      Long relativeTimeStamp;
      while (running && (!isCancelled())) {
        blueInputStream.read(buffer);
        if (startTime == 0) {
          startTime = System.currentTimeMillis();
          relativeTimeStamp = (long) 0;
        } else {
          relativeTimeStamp = System.currentTimeMillis() - startTime;
        }
        pulse = unsignedByteToInt(buffer[1]);
        byte b1 = buffer[0];
        if (isBitSet(b1, 0)) {
          pulse += 128;
        }
        writer.println(pulse + " | " + relativeTimeStamp + "\r\n");
        // publishProgress();
        Message msg = new Message();
        Bundle b = new Bundle();
        b.putString("pulse", pulse + "");
        msg.setData(b);
        handler.sendMessage(msg);
      }

    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
      Log.d("ReadBluetooth", "Connect failed");
    } finally {
      try {
        if (writer != null) {
          writer.close();
        }
        if (socket != null) {
          socket.close();
        }
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }

  }

  /**
   * Set whether the thread should be cancelled or not
   * 
   * @param cancelled
   */
  public void setCancelled(boolean cancelled) {
    this.cancelled = cancelled;
  }

  /**
   * Returns whether thread is cancelled or not
   * 
   * @return
   */
  public boolean isCancelled() {
    return cancelled;
  }

  /**
   * Converts unsigned byte to integer
   * 
   * @param b
   * @return
   */
  /*
   * Method given by task instructions
   */
  private static int unsignedByteToInt(byte b) {
    return (int) b & 0xFF;
  }

  /**
   * Checks if bit is set or not
   * 
   * @param b
   * @param pos
   *            Position in the byte (0 least significant)
   * @return
   */
  // Stolen from
  // stackoverflow.com/questions/2431732/checking-if-a-bit-is-set-or-not
  private static boolean isBitSet(byte b, int pos) {
    return (b & (1 << pos)) != 0;
  }

  /**
   * Returns output file
   * 
   * @return
   */
  public File getFile() {
    return file;
  }

}

Java Source Code List

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