@Override
public List<TouchEvent> getTouchEvents() {
synchronized (this) {
// We find out how many events are in the touchEvents arrayList
int len = touchEvents.size();
// Then we iterate through each item and add it to the Pool's recyclable Events ArrayList
for (int i = 0; i < len; i++) {
touchEventPool.free(touchEvents.get(i));
}
// Then we empty the touchEvents ArrayList
touchEvents.clear();
// Basically just copy all of the items in touchEventsBuffer
// ArrayList into touchEvents ArrayList
touchEvents.addAll(touchEventsBuffer);
// Then we clear the touchEventsBuffer ArrayList
touchEventsBuffer.clear();
return touchEvents;
}
}
/** Called when touch events are fired */
@Override
public boolean onTouch(View v, MotionEvent event) {
synchronized (this) {
// First we want the event type. We mask the getAction() integer.
int action = event.getAction() & MotionEvent.ACTION_MASK;
// Then, we extract the pointer index and fetch the corresponding pointer identifier from the
// MotionEvent (p.139)
int pointerIndex =
(event.getAction() & MotionEvent.ACTION_POINTER_ID_MASK)
>> MotionEvent.ACTION_POINTER_ID_SHIFT;
// Find out the number of fingers that have coordinates in the motion event. getPointerCount()
// returns the number of active pointers
int pointerCount = event.getPointerCount();
TouchEvent touchEvent;
for (int i = 0; i < MAX_TOUCHPOINTS; i++) {
// Reset the data for fingers that are not/no longer touched down.
if (i >= pointerCount) {
isTouched[i] = false;
id[i] = -1;
continue;
}
// getPointerId takes a pointer index, and returns the pointer identifier based on a pointer
// index
int pointerId = event.getPointerId(i);
if (event.getAction() != MotionEvent.ACTION_MOVE && i != pointerIndex) {
// if it's an up/down/cancel/out event, mask the id to see if we should process it for
// this touch point
continue;
}
switch (action) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_POINTER_DOWN:
{
touchEvent = touchEventPool.newObject();
touchEvent.type = TouchEvent.TOUCH_DOWN;
touchEvent.pointer = pointerId;
touchEvent.x = touchX[i] = (int) (event.getX(i) * scaleX);
touchEvent.y = touchY[i] = (int) (event.getY(i) * scaleY);
isTouched[i] = true;
id[i] = pointerId;
touchEventsBuffer.add(touchEvent);
break;
}
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
case MotionEvent.ACTION_CANCEL:
{
touchEvent = touchEventPool.newObject();
touchEvent.type = TouchEvent.TOUCH_UP;
touchEvent.pointer = pointerId;
touchEvent.x = touchX[i] = (int) (event.getX(i) * scaleX);
touchEvent.y = touchY[i] = (int) (event.getY(i) * scaleY);
isTouched[i] = false;
id[i] = -1;
touchEventsBuffer.add(touchEvent);
break;
}
case MotionEvent.ACTION_MOVE:
{
touchEvent = touchEventPool.newObject();
touchEvent.type = TouchEvent.TOUCH_DRAGGED;
touchEvent.pointer = pointerId;
touchEvent.x = touchX[i] = (int) (event.getX(i) * scaleX);
touchEvent.y = touchY[i] = (int) (event.getY(i) * scaleY);
isTouched[i] = true;
id[i] = pointerId;
touchEventsBuffer.add(touchEvent);
break;
}
} // end switch
} // end for loop
// Indicate that we processed the touch event ourselves
return true;
}
}