如何在viewpager中使用recyclerview smothScrollToPosition

Question

我想在viewpager中使用recyclerview，当我想使用smothScrollToPosition滚动到某个位置时，我看不到当前页面的任何变化，但是当我滑动时，我看到变化已经已应用于下一页或上一页。我在此方法中的sliderAdapter调用scrollTo中定义了一个函数，在我单击smothScrollToPosition的过程中。当用户单击MainActivity]中的按钮时，调用方法[[scrollTo

MainActivity

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)


    val pager = findViewById<ViewPager>(R.id.view_pager)
    val adapter = SlideAdapter(this)

    pager.adapter = adapter

    findViewById<Button>(R.id.button).setOnClickListener {
        adapter.scrollTo(30)
    }
}

}
SlideAdapter

class SlideAdapter(val context: Context) : PagerAdapter()  {

lateinit var recyclerView: RecyclerView
lateinit var viewManager : LinearLayoutManager

fun scrollTo(position: Int) {
    viewManager.scrollToPositionWithOffset(position, 0)
}

override fun isViewFromObject(view: View, `object`: Any): Boolean = view == `object` as RelativeLayout

override fun getCount() = 5

override fun instantiateItem(container: ViewGroup, position: Int): Any {
    val view = LayoutInflater.from(context)
            .inflate(R.layout.slide, container, false) as RelativeLayout


    val list = mutableListOf<String>()

    for (i in 0..50)
        list.add("Element $i")

    val viewAdapter = Adapter(context, list)
    viewManager = LinearLayoutManager(context)
    recyclerView = view.findViewById(R.id.recyclerView)

    recyclerView.apply {
        setHasFixedSize(true)
        layoutManager = viewManager
        adapter = viewAdapter
    }

    container.addView(view)

    return view
}

override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) {
    container.removeView(`object` as RelativeLayout)
}

}
[IMAGE PAGE 1我按一下按钮，没有发现任何变化
IMAGE PAGE 2我滑动并看到此更改已应用到此页面上。 
我需要帮助，请
^ _ ^

Answer 1

从方法scrollToPositionWithOffset的JavaDOC：