android recycleview点击滑动到指定位置

只需要自定义一个LinearSmoothScroller，仔细看LinearSmoothScroller的源码发现，其实谷歌已经埋下了伏笔，既然纠正就纠正到底吧

public class TopSmoothScroller extends LinearSmoothScroller {
    TopSmoothScroller(Context context) {
        super(context);
    }
    @Override
    protected int getHorizontalSnapPreference() {
        return SNAP_TO_START;
    }
    @Override
    protected int getVerticalSnapPreference() {
        return SNAP_TO_START;
    }
}

然后调用LinearLayoutManager的startSmoothScroll即可

final TopSmoothScroller mScroller = new TopSmoothScroller(getActivity());
mScroller.setTargetPosition(integer);
mManager.startSmoothScroll(mScroller);

demo：

public class RvHuaDongActivity extends BaseActivity {
    RecyclerView mRv;
    private LinearLayoutManager mManager;

    //此处等于onCreate
    @Override
    protected void initData() {
        List<String> list = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            list.add("position" + i);
        }
        mManager = new LinearLayoutManager(this);
        mRv.setLayoutManager(mManager);
        mRv.setAdapter(new MyAdapter(list));
    }

    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.tv_rvhuadong_GuanXing_1:
                int position1 = (int) (Math.random() * 100);
                Toast.makeText(this, "滑到：" + position1, Toast.LENGTH_SHORT).show();
                LinearSmoothScroller s1 = new TopSmoothScroller(getActivity());
                s1.setTargetPosition(position1);
                mManager.startSmoothScroll(s1);
                break;
            case R.id.tv_rvhuadong_GuanXing_2:
                LinearSmoothScroller s2 = new TopSmoothScroller(getActivity());
                s2.setTargetPosition(20);
                mManager.startSmoothScroll(s2);
                break;
            case R.id.tv_rvhuadong_GuanXing_3:
                LinearSmoothScroller s3 = new TopSmoothScroller(getActivity());
                s3.setTargetPosition(99);
                mManager.startSmoothScroll(s3);
                break;
            case R.id.tv_rvhuadong_ShanXian_1:
                int position2 = (int) (Math.random() * 100);
                Toast.makeText(this, "闪到：" + position2, Toast.LENGTH_SHORT).show();
                mManager.scrollToPositionWithOffset(position2, 0);
                break;
            case R.id.tv_rvhuadong_ShanXian_2:
                mManager.scrollToPositionWithOffset(20, 0);
                break;
            case R.id.tv_rvhuadong_ShanXian_3:
                mManager.scrollToPositionWithOffset(99, 0);
                break;
        }
    }
 
    private class MyAdapter extends RecyclerView.Adapter<BaseViewHolder> {
        private final List<String> mList;
 
        public MyAdapter(List<String> list) {
            mList = list;
        }
 
        @Override
        public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            LinearLayout ll = new LinearLayout(getActivity());
            ll.setLayoutParams(new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
            ll.setOrientation(LinearLayout.VERTICAL);
 
            AppCompatTextView tv = new AppCompatTextView(RvHuaDongActivity.this);
            tv.setTextSize(30);
            tv.setBackgroundColor(0xffeeeeee);
            ll.addView(tv);
 
            RecyclerView rv = new RecyclerView(getActivity());
            rv.setLayoutManager(new LinearLayoutManager(getActivity()));
            rv.setNestedScrollingEnabled(true);
            rv.setAdapter(new ItemAdapter(new ArrayList<String>()));
            ll.addView(rv, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
            return new BaseViewHolder(ll);
        }
 
        @Override
        public void onBindViewHolder(BaseViewHolder holder, int position) {
            ViewGroup vg = (ViewGroup) holder.itemView;
            TextView tv = (TextView) vg.getChildAt(0);
            tv.setText(mList.get(position));
 
            RecyclerView rv = (RecyclerView) vg.getChildAt(1);
            ItemAdapter adapter = (ItemAdapter) rv.getAdapter();
            adapter.mList.clear();
            for (int i = 0; i < 6; i++) {
                adapter.mList.add("item" + i);
            }
            adapter.notifyDataSetChanged();//在bind时确定好数据
        }
 
        @Override
        public int getItemCount() {
            return mList.size();
        }
    }
 
    private class ItemAdapter extends RecyclerView.Adapter<BaseViewHolder> {
        private final List<String> mList;
 
        public ItemAdapter(List<String> list) {
            mList = list;
        }
 
 
        @Override
        public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            AppCompatTextView tv = new AppCompatTextView(RvHuaDongActivity.this);
            tv.setTextSize(30);
            tv.setBackgroundColor(0xffeeeeee);
            tv.setLayoutParams(new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
            return new BaseViewHolder(tv);
        }
 
        @Override
        public void onBindViewHolder(BaseViewHolder holder, int position) {
            TextView tv = (TextView) holder.itemView;
            tv.setText(mList.get(position));
            if (position >= mList.size() - 2) {
                tv.getLayoutParams().height = 600;
            } else {
                tv.getLayoutParams().height = ViewGroup.LayoutParams.WRAP_CONTENT;
            }
            tv.setLayoutParams(tv.getLayoutParams());
        }
 
        @Override
        public int getItemCount() {
            return mList.size();
        }
    }
}