StickyNavLayout.java

@Override
	public boolean onTouchEvent(MotionEvent event)
	{
		mVelocityTracker.addMovement(event);
		int action = event.getAction();
		float y = event.getY();
 
		switch (action)
		{
		case MotionEvent.ACTION_DOWN:
			if (!mScroller.isFinished())
				mScroller.abortAnimation();
			mVelocityTracker.clear();
			mVelocityTracker.addMovement(event);
			mLastY = y;
			return true;
		case MotionEvent.ACTION_MOVE:
			float dy = y - mLastY;
 
			if (!mDragging && Math.abs(dy) > mTouchSlop)
			{
				mDragging = true;
			}
			if (mDragging)
			{
				scrollBy(0, (int) -dy);
				mLastY = y;
			}
			break;
		case MotionEvent.ACTION_CANCEL:
			mDragging = false;
			if (!mScroller.isFinished())
			{
				mScroller.abortAnimation();
			}
			break;
		case MotionEvent.ACTION_UP:
			mDragging = false;
			mVelocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
			int velocityY = (int) mVelocityTracker.getYVelocity();
			if (Math.abs(velocityY) > mMinimumVelocity)
			{
				fling(-velocityY);
			}
			mVelocityTracker.clear();
			break;
		}
 
		return super.onTouchEvent(event);
	}