ScrollableLayout 可滚动的tab

<ru.noties.scrollable.ScrollableLayout    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/scrollable_layout"
    app:scrollable_maxScroll="@dimen/header_height"> --!(1)

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="@dimen/header_height" --!(2)            android:background="@color/header_background"
            android:textColor="@color/white"
            android:textSize="30sp"
            android:text="Header"
            android:id="@+id/header"
            android:gravity="center"/>

        <ru.noties.scrollable.sample.TabsLayout            android:layout_width="match_parent"
            android:layout_height="@dimen/tabs_height" --!(3)            android:background="@color/tabs_background"
            android:id="@+id/tabs" />

    </LinearLayout>

    <android.support.v4.view.ViewPager        android:layout_width="match_parent"
        android:layout_height="match_parent" --!(4)        android:layout_marginTop="@dimen/tabs_height" --!(5)        android:id="@+id/view_pager" />

</ru.noties.scrollable.ScrollableLayout>

final View header = findViewById(R.id.header);final TabsLayout tabs = findView(this, R.id.tabs);

mScrollableLayout = findView(this, R.id.scrollable_layout);
mScrollableLayout.setDraggableView(tabs);final ViewPager viewPager = findView(this, R.id.view_pager);final ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager(), getResources(), getFragments());
viewPager.setAdapter(adapter);

tabs.setViewPager(viewPager);// Note this bit, it's very importantmScrollableLayout.setCanScrollVerticallyDelegate(new CanScrollVerticallyDelegate() {    @Override
    public boolean canScrollVertically(int direction) {        return adapter.canScrollVertically(viewPager.getCurrentItem(), direction);
    }
});

mScrollableLayout.setOnScrollChangedListener(new OnScrollChangedListener() {  @Override
  public void onScrollChanged(int y, int oldY, int maxY) {    // Sticky behavior
    final float tabsTranslationY;    if (y < maxY) {
        tabsTranslationY = .0F;
    } else {
        tabsTranslationY = y - maxY;
    }

    tabs.setTranslationY(tabsTranslationY);

    header.setTranslationY(y / 2);
  }
});