// 滚动到指定位置
recyclerView.scrollToPosition(position);
// 平滑滚动到指定位置
recyclerView.smoothScrollToPosition(position);

// scrollBy(x,y)这个方法是自己去控制移动的距离，单位是像素,所以在使用scrollBy(x,y)需要自己去计算移动的高度或宽度。
recyclerView.scrollBy(x,y)

mRecyclerView.scrollToPosition(0);
mRecyclerView.scrollBy(0,400);

mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
      @Override
      public void onScrollStateChanged(RecyclerView recyclerView,int newState) {
        super.onScrollStateChanged(recyclerView,newState);
      }

      @Override
      public void onScrolled(RecyclerView recyclerView,int dx,int dy) {
        super.onScrolled(recyclerView,dx,dy);
      }
    });

 Rect rect = new Rect();
 mRecyclerView.getGlobalVisibleRect(rect);
 reHeight = rect.bottom - rect.top - vHeight;
当运行 scrollToPosition 后，点击条目就会出现在视野当中，这时候，计算出相应的位移即可。需要注意一点的是，当点击条目在视野内的时候，是不会运行 scrollToPosition 方法的。

    int top = mRecyclerView.getChildAt(position - firstPosition).getTop();
int half = reHeight / 2;
    mRecyclerView.scrollBy(0,top - half);

public class MainActivity extends AppCompatActivity {
  private static final String TAG = "MainActivity";
  private RecyclerView mRecyclerView;
  private linearlayoutmanager mLayoutManager;
  private RecyclerView.Adapter mAdapter;
  private String[] data;
  private Handler handler;
  private boolean isClick = false;
  private static int vHeight = -1;
  private static int reHeight = -1;
  private static int position = 0;
  private static final int target = 10;
  private static boolean isMove = false;
  private Runnable runnable;

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

    handler = new Handler();

    mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
    //创建默认的线性LayoutManager
    mLayoutManager = new linearlayoutmanager(this);
    mLayoutManager.setAutoMeasureEnabled(true);
    mRecyclerView.setLayoutManager(mLayoutManager);
    //如果可以确定每个item的高度是固定的，设置这个选项可以提高性能
    mRecyclerView.setHasFixedSize(true);
    mRecyclerView.setnestedScrollingEnabled(false);
    data = new String[]{"1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21"};


    runnable = new Runnable() {
      @Override
      public void run() {
        if (isVisible()) {
          scrollToMiddle();
        } else {
          mRecyclerView.scrollToPosition(position);
          isMove = true;
          isClick = false;
        }
      }
    };

    mAdapter = new MyAdapter(data,new MyAdapter.onRecyclerViewItemClick() {
      @Override
      public void onItemClick(View v,int pos) {
        Toast.makeText(MainActivity.this,"第" + pos + "行",Toast.LENGTH_SHORT).show();
        position = pos;
        vHeight = v.getHeight();

        Rect rect = new Rect();
        mRecyclerView.getGlobalVisibleRect(rect);
        reHeight = rect.bottom - rect.top - vHeight;

        // handler.removeCallbacksAndMessages(null);
        handler.removeCallbacks(runnable);
        handler.postDelayed(runnable,4000);
        isClick = true;

      }
    });
    mRecyclerView.setAdapter(mAdapter);
    mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
      @Override
      public void onScrollStateChanged(RecyclerView recyclerView,newState);
        Log.d(TAG,"" + newState);
        if (newState == RecyclerView.SCROLL_STATE_DRAGGING && !isMove) {
          handler.removeCallbacks(runnable);
        }
        if (newState == RecyclerView.SCROLL_STATE_IDLE) {
          if (isClick) {
            handler.postDelayed(runnable,4000);
          }
        }
      }

      @Override
      public void onScrolled(RecyclerView recyclerView,dy);
        if (isMove) {
          if (vHeight < 0) {
            isMove = false;
            return;
          }
          scrollToMiddle();
        }
      }
    });
public void scrollToMiddle() {
    final int firstPosition = mLayoutManager.findFirstVisibleItemPosition();
    int top = mRecyclerView.getChildAt(position - firstPosition).getTop();
    Log.d(TAG," position" + position + " " + top);
    int half = reHeight / 2;
    mRecyclerView.scrollBy(0,top - half);
    isMove = false;

  }

  public boolean isVisible() {
    final int firstPosition = mLayoutManager.findFirstVisibleItemPosition();
    final int lastPosition = mLayoutManager.findLastVisibleItemPosition();
    return position <= lastPosition && position >= firstPosition;
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    handler.removeCallbacksAndMessages(null);
    handler = null;
  }
}

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