Matey Matey - 5 months ago 15
Android Question

Measure elapsed time between two MotionEvents in Android

I'm new in Android programming so I am asking for your help in my problem.
I am trying to measure in seconds/milliseconds the amount of time between a MouseEvent.ACTION_DOWN and MouseEvent.ACTION_UP.

@Override
public boolean onTouchEvent(MotionEvent event) {
long start=0;
if (event.getAction() == MotionEvent.ACTION_DOWN) {
// manage down press
start=System.nanoTime();//START
System.out.println("START");
}
else if (event.getAction() == MotionEvent.ACTION_MOVE) {
// manage move
System.out.println(event.getRawX()+","+event.getRawY());
}
else {
// manage up
long finish=System.nanoTime()//FINISH
long seconds = (finish-start) / 1000000000;//for seconds
Toast.makeText(this, "FINISH, duration: "+seconds, Toast.LENGTH_SHORT).show();
System.out.println("FINISH, duration: "+seconds);
}
return true;
}




Logcat:
03-19 04:04:27.140: I/System.out(4348): START
03-19 04:04:27.160: I/System.out(4348): 517.0,280.0
03-19 04:04:27.190: I/System.out(4348): 517.0,280.0
03-19 04:04:27.200: I/System.out(4348): 517.0,280.0
03-19 04:04:27.220: I/System.out(4348): 517.0,280.0
03-19 04:04:27.250: I/System.out(4348): 517.0,280.0
03-19 04:04:27.260: I/System.out(4348): 517.0,280.0
03-19 04:04:27.300: I/System.out(4348): 517.0,280.0
03-19 04:04:27.310: I/System.out(4348): 517.0,280.0
03-19 04:04:27.330: I/System.out(4348): FINISH, duration: 16545



My problem consist in fact that seconds variable doesn't show what I
want, I even don't know if its measuring correctly.For the above
example duration was 16545 (???!?!?) but it should have been between
1-3 seconds.What shall I do to measure correctly in seconds or
milliseconds the time between two MotionEvents or what am I wrong in
my example ? Thank you !

Answer
long startTime;
public boolean onTouchEvent(MotionEvent event) {

    if (event.getAction() == MotionEvent.ACTION_DOWN) 
        startTime = System.nanoTime();    

    else if (event.getAction() == MotionEvent.ACTION_UP) {
        long elapseTime = System.nanoTime() - startTime;
        //do whatever u want with elapseTime now, its in nanoseconds
    }
}