@Override
public boolean onTouchEvent(MotionEvent event) {
if (velocityTracker == null) { // If we do not have velocity tracker
velocityTracker = VelocityTracker.obtain(); // then get one
}
velocityTracker.addMovement(event); // add this movement to it
positiveScroll = true;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
{
if (!flinger.isFinished()) { // If scrolling, then stop now
flinger.forceFinished();
}
currentX = (int) event.getRawX();
currentY = (int) event.getRawY();
break;
}
case MotionEvent.ACTION_MOVE:
{
final int x2 = (int) event.getRawX();
final int y2 = (int) event.getRawY();
final int diffX = currentX - x2;
final int diffY = currentY - y2;
currentX = x2;
currentY = y2;
scrollBy(diffX, diffY);
break;
}
case MotionEvent.ACTION_UP:
{
final VelocityTracker velocityTracker = this.velocityTracker;
velocityTracker.computeCurrentVelocity(1000, maximumVelocity);
int velocityX = (int) velocityTracker.getXVelocity();
int velocityY = (int) velocityTracker.getYVelocity();
if (Math.abs(velocityX) > minimumVelocity || Math.abs(velocityY) > minimumVelocity) {
flinger.start(
getActualScrollX(),
getActualScrollY(),
velocityX,
velocityY,
getMaxScrollX(),
getMaxScrollY());
} else {
if (this.velocityTracker != null) { // If the velocity less than threshold
this.velocityTracker.recycle(); // recycle the tracker
this.velocityTracker = null;
}
}
break;
}
}
return true;
}
