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PODynamic Data from bluetooth plotting
 

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    <p>First of all, I am very new to Java programming language, And I tried searching for what I want but nothing was specific. Secondly, I am trying to plot Dynamic data from a bluetooth device,</p> <p>The data can be plotted simply using the <code>Sensorgraph</code> application (open source app), however the plot is not very clear ( I can't zoom in or out, no x or y axis...). Hence, I need another way to try and plot the data to show it in a better way. Here is the <code>SensorGraph</code> code:</p> <pre><code>public class SensorGraph extends Activity { Button Start, Stop, Pause; private static final String TAG = "SensorGraph"; // change this to your Bluetooth device address private static final String DEVICE_ADDRESS = "00:06:66:4B:E2:B7"; //"00:06:66:03:73:7B"; private GraphView mGraph; private TextView mValueTV; private ArduinoReceiver arduinoReceiver = new ArduinoReceiver(); /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // get handles to Views defined in our layout file mGraph = (GraphView)findViewById(R.id.graph); mValueTV = (TextView) findViewById(R.id.value); mGraph.setMaxValue(1024); } @Override protected void onStart() { super.onStart(); // in order to receive broadcasted intents we need to register our receiver registerReceiver(arduinoReceiver, new IntentFilter(AmarinoIntent.ACTION_RECEIVED)); // this is how you tell Amarino to connect to a specific BT device from within your own code Amarino.connect(this, DEVICE_ADDRESS); } @Override protected void onStop() { super.onStop(); // if you connect in onStart() you must not forget to disconnect when your app is closed Amarino.disconnect(this, DEVICE_ADDRESS); // do never forget to unregister a registered receiver unregisterReceiver(arduinoReceiver); } /** * ArduinoReceiver is responsible for catching broadcasted Amarino * events. * * It extracts data from the intent and updates the graph accordingly. */ public class ArduinoReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { String data = null; // the device address from which the data was sent, we don't need it here but to demonstrate how you retrieve it final String address = intent.getStringExtra(AmarinoIntent.EXTRA_DEVICE_ADDRESS); // the type of data which is added to the intent final int dataType = intent.getIntExtra(AmarinoIntent.EXTRA_DATA_TYPE, -1); // we only expect String data though, but it is better to check if really string was sent // later Amarino will support differnt data types, so far data comes always as string and // you have to parse the data to the type you have sent from Arduino, like it is shown below if (dataType == AmarinoIntent.STRING_EXTRA){ data = intent.getStringExtra(AmarinoIntent.EXTRA_DATA); if (data != null){ mValueTV.setText(data); try { // since we know that our string value is an int number we can parse it to an integer final int sensorReading = Integer.parseInt(data); mGraph.addDataPoint(sensorReading); } catch (NumberFormatException e) { /* oh data was not an integer */ } } } } } } </code></pre> <p>The graphview code is the following:</p> <pre><code> public class GraphView extends View { private Bitmap mBitmap; private Paint mPaint = new Paint(); private Canvas mCanvas = new Canvas(); private float mSpeed = 1.0f; private float mLastX; private float mScale; private float mLastValue; private float mYOffset; private int mColor; private float mWidth; private float maxValue = 1024f; public GraphView(Context context) { super(context); init(); } public GraphView(Context context, AttributeSet attrs) { super(context, attrs); init(); } private void init(){ mColor = Color.argb(192, 64, 128, 64); mPaint.setFlags(Paint.ANTI_ALIAS_FLAG); } public void addDataPoint(float value){ final Paint paint = mPaint; float newX = mLastX + mSpeed; final float v = mYOffset + value * mScale; paint.setColor(mColor); mCanvas.drawLine(mLastX, mLastValue, newX, v, paint); mLastValue = v; mLastX += mSpeed; invalidate(); } public void setMaxValue(int max){ maxValue = max; mScale = - (mYOffset * (1.0f / maxValue)); } public void setSpeed(float speed){ mSpeed = speed; } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.RGB_565); mCanvas.setBitmap(mBitmap); mCanvas.drawColor(0xFFFFFFFF); mYOffset = h; mScale = - (mYOffset * (1.0f / maxValue)); mWidth = w; mLastX = mWidth; super.onSizeChanged(w, h, oldw, oldh); } @Override protected void onDraw(Canvas canvas) { synchronized (this) { if (mBitmap != null) { if (mLastX &gt;= mWidth) { mLastX = 0; final Canvas cavas = mCanvas; cavas.drawColor(0xFFFFFFFF); mPaint.setColor(0xFF777777); cavas.drawLine(0, mYOffset, mWidth, mYOffset, mPaint); } canvas.drawBitmap(mBitmap, 0, 0, null); } } } </code></pre> <p>}</p> <p>The part I need to change is mostly the sensor reading and make it plot on another graph! Thank you so much and I appreciate any help. If you have a question please let me know.</p>
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