// write RR values to a text file kept in the application data directory for possible later use
public void writeRR(View v) {
try {
// status.setMessage("writing RR values to file");
SimpleDateFormat format = new SimpleDateFormat("yyyy_MM_dd_HH_mm");
// give user feedback the button worked
v.playSoundEffect(SoundEffectConstants.CLICK);
double starttime = series.getX(0);
String mydate = (format.format(starttime));
String FILENAME = "rr_" + mydate + ".txt";
status.setMessage("writing RR values to file to Documents " + FILENAME);
File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS);
File file = new File(path, "/" + FILENAME);
dbg(file.getAbsolutePath().toString());
file.createNewFile();
FileOutputStream fos = new FileOutputStream(file);
for (int i = 1; i < series.getItemCount(); i++) {
int temprr = (int) (series.getX(i) - series.getX(i - 1));
String s = String.valueOf(temprr) + "\n";
fos.write(s.getBytes());
}
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public void startZephyr(View v) {
v.playSoundEffect(SoundEffectConstants.CLICK);
status.setMessage("Connecting Zephyr");
x = System.currentTimeMillis();
zm.connect();
}
// the zephry manager will send RR values to this listener.
// RRs are the milliseconds between beats. Example, steady 60 BPM heartbeat sends rr values of
// 1000 because there is a full second between beats
public void updateChart(int rr) {
// we throw out any 0s or absurd values. We have found this tends not to happen with a good
// chest strap
if ((rr < 1) || (rr > 3000)) return;
int pulserate = 60000 / rr;
series.add(x, pulserate);
x = x + rr; // time is also the accumulation of RR values
// Achartengine stuff
XYSeriesRenderer renderer = new XYSeriesRenderer();
XYMultipleSeriesRenderer mRenderer = new XYMultipleSeriesRenderer();
// Set the right side to current time
mRenderer.setXAxisMax(x);
// set the left side to one minute earlier 60000 miliseconds
mRenderer.setXAxisMin(x - 60000);
mRenderer.setYAxisMin(MIN_HEART_RATE);
mRenderer.setYAxisMax(MAX_HEART_RATE);
mRenderer.setLabelsTextSize(LABELTEXTSIZE);
renderer.setFillPoints(true);
renderer.setLineWidth(2);
renderer.setPointStyle(style);
mRenderer.setShowLegend(false);
mRenderer.setChartTitle(title);
mRenderer.setShowGrid(true);
mRenderer.setGridColor(gridcolor);
mRenderer.setXLabels(11);
mRenderer.setYLabels(5);
mRenderer.setAxisTitleTextSize(25);
mRenderer.setChartTitleTextSize(30);
mRenderer.setLabelsTextSize(20);
mRenderer.setLegendTextSize(15);
mRenderer.setPointSize(2f);
mRenderer.setMargins(new int[] {20, 30, 15, 0});
mRenderer.setYLabelsAlign(Align.RIGHT);
mDataset.removeSeries(0);
mDataset.addSeries(series);
renderer.setColor(linecolor);
context = getApplicationContext();
mRenderer.setApplyBackgroundColor(true);
mRenderer.setBackgroundColor(bgcolor);
mRenderer.addSeriesRenderer(renderer);
chartview = ChartFactory.getTimeChartView(context, mDataset, mRenderer, null);
chartview.invalidate();
((TextView) findViewById(R.id.heartratelabel)).setText("HR:" + pulserate);
chartview.repaint();
FrameLayout chartlayout = (FrameLayout) findViewById(R.id.chartlayout);
chartlayout.removeAllViewsInLayout();
chartlayout.addView(
chartview,
new FrameLayout.LayoutParams(
FrameLayout.LayoutParams.FILL_PARENT, FrameLayout.LayoutParams.FILL_PARENT));
status
.checkForClear(); // this needs to be done time to time regularly so statuses are not stuck
// on.
}
