Android :: Limit To Number Of Touch Inputs In Application?

I have a small test app on Android that is meant to test tracking multitouch input, but I am only ever getting two touches at the same time on my Evo. Does anyone know if this is a limitation to Android or the hardware? By the way, here's my test class so you can try it out yourself.

import java.util.HashMap; import android.content.Context;
import android.graphics.Canvas; import android.graphics.Color;
import android.graphics.Paint; import android.graphics.Paint.Style;
import android.view.MotionEvent; import android.view.View;
public class PressureView extends View {
private HashMap<Integer, Spot> mSpots = new HashMap<Integer, Spot>();
private final int[] mColors; private final Paint mPaint;
public PressureView(Context context) { super(context);
mPaint = new Paint(); mPaint.setStyle(Style.FILL);
mColors = new int[]{Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW, Color.MAGENTA};

} @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas);
canvas.drawColor(Color.WHITE); for(int id : mSpots.keySet()) {
Spot spot = mSpots.get(id); mPaint.setColor(spot.Color);
canvas.drawCircle(spot.X, spot.Y, spot.Pressure*500, mPaint);
} } @Override public boolean onTouchEvent(MotionEvent event) {
System.out.println("***" + event.getPointerCount() + " Pointers");
for(int i = 0; i < event.getPointerCount(); i++) { int id = event.getPointerId(i);
Spot spot = null; if(mSpots.containsKey(id)) { spot = mSpots.get(id);
} else { spot = new Spot(); spot.Color = mColors[mSpots.size()]; }

if(event.getAction() == MotionEvent.ACTION_UP) spot.Pressure = 0;
else spot.Pressure = event.getPressure(id);
spot.X = event.getX(id); spot.Y = event.getY(id);
mSpots.put(id, spot); } invalidate(); return true;
} private class Spot { public float X, Y, Pressure; public int Color; } }