Android：设置RecyclerView

Question

我想实现一个视图选择器，它就像一个数字视图选择器，但不是选择数字，而是选择拾取器中心的视图。

基本思想是获取居中项目的位置，并用不同的视图替换该位置的视图。为此，我做了以下 -

我有以下布局 -

<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent">


<View
    android:id="@+id/view"
    android:background="#ffeb3b"
    android:layout_gravity="center"
    android:layout_height="56dp"
    android:layout_width="match_parent" />

<android.support.v7.widget.RecyclerView
    android:id="@+id/rvItems"
    android:clipToPadding="false"
    android:layout_height="match_parent"
    android:layout_width="match_parent" />
 </FrameLayout>

填充视图的活动是 -

public class MainActivity extends AppCompatActivity {

    private static final String TAG = MainActivity.class.getSimpleName();
    private RecyclerView rvItems;
    private View view;
    private List<Data> array = new ArrayList<>();


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        for (int i=0; i< 100; i++) {
            final Data data = new Data();
            data.isVisible = true;
            data.data = String.valueOf(i);
            array.add(data);
        }

        view = (View) findViewById(R.id.view);
        rvItems = (RecyclerView) findViewById(R.id.rvItems);
        rvItems.setAdapter(new SliderAdapter(array));
        final LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        rvItems.setLayoutManager(layoutManager);

        rvItems.post(new Runnable() {
            @Override
            public void run() {
                int firstVisibleChildPosition = layoutManager.findFirstCompletelyVisibleItemPosition();
                int lastVisibleChildPosition = layoutManager.findLastCompletelyVisibleItemPosition();

                int centerChildPosition = (firstVisibleChildPosition + lastVisibleChildPosition) / 2;

                for (int i=0; i < centerChildPosition; i++) {
                    final Data data = new Data();
                    data.isVisible = false;

                    // Adding empty list at begining and end of position
                    array.add(0, data);
                    array.add(array.size(), data);
                }

                rvItems.getAdapter().notifyDataSetChanged();
            }
        });
        rvItems.addOnScrollListener(new RecyclerView.OnScrollListener() {
            int centerChildPosition = -1;

            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                if (newState == RecyclerView.SCROLL_STATE_IDLE) {
                    int firstVisibleChildPosition = layoutManager.findFirstCompletelyVisibleItemPosition();
                    int lastVisibleChildPosition = layoutManager.findLastCompletelyVisibleItemPosition();

                    centerChildPosition = (firstVisibleChildPosition + lastVisibleChildPosition) / 2;

                    recyclerView.scrollToPosition(centerChildPosition);
                }
                Log.d(TAG, "center position = " + centerChildPosition );
            }
        });
    }
}

使用上面的代码，我能够知道居中的子位置，但无法在黄色矩形视图中正确拟合 -

如何确保数字在黄色栏内？现在，我在列表的顶部和底部添加了空视图，以便列表中的第一个和最后一个项可以居中。什么是最佳方式？