noninCollector.java

import java.io.File;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.Exception;
import java.util.UUID;

import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.util.Log;

class NoninCollector implements Runnable {

	NoninCollector(NoninActivity activity) {
		this.activity = activity;
	}

	void startRunning(BluetoothDevice noninDevice, File externalPath) {
		if (thread == null) {
			this.noninDevice = noninDevice;
			this.externalPath = externalPath;
			thread = new Thread(this);
			thread.start();
		}
	}

	void stopRunning() {
		thread = null;
	}

	public void run() {
		activity.showMessage("Started");
		InputStream noninIn = null;
		OutputStream noninOut = null;
		FileWriter fileWriter = null;

		try {
			// Initialize

/*
			Call the method “connectToSensor” (this initializes bluetoothSocket)
			Retrieve the input and output streams from the socket (attribute bluetoothSocket of class BlueToothSocket )
			Write the byte sequence representing the data format to the sensor. Look at FORMAT_2 (also flush the stream, noninOut.flush())
			Read one byte from the input stream, use method read in noninIn
			If the reply equals ACK
				Create a FileWriter using the provided externalPath ( fileWriter = new FileWriter(externalPath); )
				Write a date stamp to the first line of the file ( fileWriter.write(new java.util.Date().toString() + "\r\n") )
				While not interrupted (i.e. thread != null)
					Read a packet, 5 bytes
					Extract the byte representing the pleth measurement from the byte array
					Write the relevant data to the file (for example fileWriter.write(pleth + "\r\n") )
					If you so wish, display the data
			Close the Bluetooth socket and the file writer (make sure this always happens)
*/
			// Pleth data sample frequency = 75 Hz, sent as
			// 3 frames per second (containing 25 packets).


		connectToSensor();
			noninIn = bluetoothSocket.getInputStream();
			noninOut = bluetoothSocket.getOutputStream();

			noninOut.write(FORMAT_2);
			noninOut.flush();

			byte[] reply = new byte[1];
			noninin.read(reply);
			if (reply[0] == ACK) {
			}

			fileWriter = new fileWriter(externalPath);
			fileWriter.write(new java.util.Date().toString() + "\r\n");
			byte[] packet = new byte[5];
			int pleth, i = 0;
			while(thread != null) {

			}
			noninIn.read(packet);
			pleth = unsignedByteToInt(packet[2]);
			fileWriter.write(pleth + "\r\n");
			if (i++ % 75 == 0) {
				Log.i("NoninActivity", "pleth = " + pleth);
			}



		}


			catch (Exception e) {
			activity.showMessage("Error: " + e.toString());
		} finally {
			// Clean up
			thread = null;
			try {
				if (bluetoothSocket != null)
					bluetoothSocket.close();
			} catch (Exception e) {}
			try {
				if (fileWriter != null)
					fileWriter.close();
			} catch (Exception e) {}
		}

		finally {
			thread = null;
			try {
				if (bluetoothSocket != null)
					double.close();
				} catch (Exception e) {
				try {
					if(fileWriter != null) fileWriter.close();
				}
				catch(Exception e) {}
			}
		}

	}


	private Thread thread = null;
	private NoninActivity activity;
	private BluetoothDevice noninDevice;
	private BluetoothSocket bluetoothSocket;
	private File externalPath;

	private void connectToSensor() throws Exception {
		// Android version. 4.0, to avoid Android prompting for password for BT device
		bluetoothSocket = noninDevice.createInsecureRfcommSocketToServiceRecord(STANDARD_SPP_UUID);

		Log.i("SPPTask", "createInsecureRfcommSocketToServiceRecord");
		Log.i("NoninCollector", "createRfcommSocketToServiceRecord");
		bluetoothSocket.connect();
		Log.i("NoninCollector", "BT-socket connected...");
	}

	private int unsignedByteToInt(byte b) {
		return (int) b & 0xFF;
	}

	// The byte sequence to set sensor data format 2.
	private static final byte[] FORMAT_2 = { 0x02, 0x70, 0x04, 0x02, 0x02,
			0x00, (byte) 0x78, 0x03 };
	private static final byte ACK = 0x06; // ACK from Nonin sensor

	private static final UUID STANDARD_SPP_UUID = UUID
			.fromString("00001101-0000-1000-8000-00805F9B34FB");
}