public class GameView extends SurfaceView {

private ConcurrentMap<Integer, Point> activePointers; //Active pointers to know which pointer is doing what.

public GameView() {
    super(context);
    //...
    activePointers = new ConcurrentHashMap<Integer, Point>();
}

//...

@Override
public boolean onTouchEvent(MotionEvent event) {
    Point p;
    int x, y;
    int id, auxIndex;

    switch (event.getActionMasked()) {
        case MotionEvent.ACTION_DOWN:
            synchronized (holder) { //holder = getHolder();
                try {
                    id = event.getPointerId(event.getActionIndex());
                    x = Math.round(event.getX(id));
                    y = Math.round(event.getY(id));
                    activePointers.put(id, new Point(x, y));
                    doThingsDown(id, x, y);
                } catch (Exception e) {
                    //nothing
                }
            }
            break;

        case MotionEvent.ACTION_POINTER_DOWN:
            synchronized (holder) {
                try {
                    id = event.getPointerId(event.getActionIndex());
                    x = Math.round(event.getX(id));
                    y = Math.round(event.getY(id));
                    activePointers.put(id, new Point(x, y));
                    doThingsDown(id, x, y);
                } catch (Exception e) {
                    //nothing
                }
            }
            break;

        case MotionEvent.ACTION_MOVE:
            synchronized (holder) {
                try {
                    for (Integer key : activePointers.keySet()) {
                        p = activePointers.get(key);
                        auxIndex = event.findPointerIndex(key);
                        x = Math.round(event.getX(auxIndex));
                        y = Math.round(event.getY(auxIndex));
                        if (x != p.x || y != p.y) {
                            doThingsMove(key, x, y);
                        }
                    }
                } catch (Exception e) {
                    //nothing
                }
            }
            break;

        case MotionEvent.ACTION_UP:
            synchronized (holder) {
                id = event.getPointerId(event.getActionIndex());
                activePointers.remove(id);
                doThingsUp(id);
            }
            break;

        case MotionEvent.ACTION_POINTER_UP:
            synchronized (holder) {
                id = event.getPointerId(event.getActionIndex());
                activePointers.remove(id);
                doThingsUp(id);
            }
            break;

        case MotionEvent.ACTION_CANCEL: //this never calls, but is here just in case
            synchronized (holder) {
                id = event.getPointerId(event.getActionIndex());
                activePointers.remove(id);
                doThingsUp(id);
            }
            break;
    }

    gestureDetector.onTouchEvent(event); //I explain this below

    return true;
}
//...

private GestureDetector gestureDetector = new GestureDetector(gameActivity, new GestureDetector.SimpleOnGestureListener() {
    @Override
    public boolean onFling(MotionEvent event1, MotionEvent event2, float velocityX, float velocityY) {
        Log.d("ON FLING", "init: (" + event1.getX() + ", " + event1.getY() + ") ,  final: (" + event2.getX() + ", " + event2.getY() + ") ,   velocities:  " + velocityX + " ,  " + velocityY);
        return true;
    }
});