AndroidPlot FixedSizeEditableXYSeries How to use - androidplot

Question

Im new to android and very new to android plot. Can you point me to an example that uses FixedSizeEditableXYSeries?
My goal is to create a streaming plot that shows the latest sensor readings in an android app.
Thanks
===================Update - following discussion with #Nick====================
public class MainActivity extends AppCompatActivity {
// Create the redrawer so that the plot is updated
private Redrawer redrawer;
// create the message receiver - data is received via broadcasts
private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
// Get extra data included in the Intent
String message = intent.getStringExtra("CurrentHR");
Log.d("ReceivedHR ",message);
// Now put the new data point at the end of the FixedSizeEditableXYSeries, move all data points by 1.
for (int index=0;index<9;index++){
if(index<9){
hrHistory.setY(hrHistory.getY(index+1),index);
}else{
hrHistory.setY(Float.parseFloat(message),9);
}
}
}
};
// create a few references
private XYPlot xyPlot;
private FixedSizeEditableXYSeries hrHistory;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_heart_rate);
// Now find the plot views
xyPlot = (XYPlot)findViewById(R.id.xyPlot);
// Declare the local broadcast manager
LocalBroadcastManager.getInstance(this).registerReceiver(
mMessageReceiver, new IntentFilter("hrUpdate"));
// now put in some data
hrHistory = new FixedSizeEditableXYSeries("HR",10);
xyPlot.addSeries(hrHistory, new LineAndPointFormatter(Color.GREEN,Color.RED,null,null));
xyPlot.setRangeBoundaries(40, 120, BoundaryMode.FIXED);
xyPlot.setDomainBoundaries(0, 20, BoundaryMode.FIXED);
}
#Override
protected void onResume(){
super.onResume();
// set a redraw rate of 1hz and start immediately:
redrawer = new Redrawer(xyPlot, 1, true);
}
}
This gives me a nice graph but no line. It doesnt look like the plot is being updates as new data is filling the FixedSizeEditableXYSeries.

Answer 1

If you want scrolling behavior then FixedSizeEditableXYSeries would be the wrong choice; as your data scrolls you're essentially enqueueing the newest value and dequeuing the oldest value; a linked list type structure would be a better choice.
You can either implement XYSeries and back it with any suitable data structure you prefer, or you can use SimpleXYSeries, which already supports queue operations a la removeFirst() and addLast(...). There's a great example of of a dynamic scrolling plot in the demo app: OrientationSensorExampleActivity. Lines 235-245 show the specific actions mentioned above.