Manual scroll detection.

ScrollDirectionDetection.java

private static final String DEBUG_TAG = "ScrollDirectionDebug";
private float y = -1;
private String mScrollDirection = "";

// OnTouchEvent is picked up by the child view that handles the event
// So we use dispatchTouchEvent which all events pass through
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
    Log.d(DEBUG_TAG, "Action was " + event.toString());
    int action = MotionEventCompat.getActionMasked(event);

    switch (action) {
        case (MotionEvent.ACTION_DOWN):
            y = event.getY();
            return super.dispatchTouchEvent(event);
        case (MotionEvent.ACTION_MOVE):
            if (y >= event.getY()) {
                mScrollDirection = "UP";
                Log.d(DEBUG_TAG, "Scroll Direction: " + mScrollDirection);
                this.onScrollUp();
            } else if (y <= event.getY()) {
                mScrollDirection = "DOWN";
                Log.d(DEBUG_TAG, "Scroll Direction: " + mScrollDirection);
                this.onScrollDown();
            }
            y = event.getY();
            return super.dispatchTouchEvent(event);
        case (MotionEvent.ACTION_UP):
            y = -1;
            mScrollDirection = "";
            return super.dispatchTouchEvent(event);
    }

    return super.dispatchTouchEvent(event);
}