StickyNavLayout.java

public class StickyNavLayout extends LinearLayout
{
 
	private View mTop;
	private View mNav;
	private ViewPager mViewPager;
	
	private int mTopViewHeight;
	private ScrollView mInnerScrollView;
	private boolean isTopHidden = false;
 
	private OverScroller mScroller;
	private VelocityTracker mVelocityTracker;
	private int mTouchSlop;
	private int mMaximumVelocity, mMinimumVelocity;
	
	private float mLastY;
	private boolean mDragging;
	
	
 
	public StickyNavLayout(Context context, AttributeSet attrs)
	{
		super(context, attrs);
		setOrientation(LinearLayout.VERTICAL);
 
		mScroller = new OverScroller(context);
		mVelocityTracker = VelocityTracker.obtain();
		mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
		mMaximumVelocity = ViewConfiguration.get(context)
				.getScaledMaximumFlingVelocity();
		mMinimumVelocity = ViewConfiguration.get(context)
				.getScaledMinimumFlingVelocity();
 
	}
 
	@Override
	protected void onFinishInflate()
	{
		super.onFinishInflate();
		mTop = findViewById(R.id.id_stickynavlayout_topview);
		mNav = findViewById(R.id.id_stickynavlayout_indicator);
		View view = findViewById(R.id.id_stickynavlayout_viewpager);
		if (!(view instanceof ViewPager))
		{
			throw new RuntimeException(
					"id_stickynavlayout_viewpager show used by ViewPager !");
		}
		mViewPager = (ViewPager) view;
	}