RecyclerView Laggy 在 NestedScrollView/LinearLayout

Question

在深入研究代码之前，我已经检查了以下问题：

1. How to use RecyclerView inside NestedScrollView?
2. Recyclerview inside Nested Scrollview scroll but does not fast scroll like normal Recyclerview or Nested Scrollview
3. RecyclerView inside a ScrollView/NestedScrollView does not scroll properly

上述问题都没有对我有用。 RecyclerView 滚动时太迟钝。

我有一个NestedScrollview 和一个LinearLayout 作为NestedScrollview 的主要布局。布局的代码是：

<android.support.v4.widget.NestedScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:fbutton="http://schemas.android.com/apk/res-auto"
>

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

<android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/frag_misc_rv_margin_top"
        android:scrollbars="none"
        android:nestedScrollingEnabled="false"
        android:id="@+id/frag_showcase_promotion_recyclerview"/>

    </LinearLayout>
</android.support.v4.widget.NestedScrollView>

代码是：

mPromotionsRv.setLayoutManager(new LinearLayoutManager(getActivity(),LinearLayoutManager.HORIZONTAL,false));
mPromotionsRv.setNestedScrollingEnabled(false);
mPromotionsAdapter = new ShowcasePromotionRvAdapter(getActivity(), mPromotionsItems);
mPromotionsAdapter.setOnItemClickListener(new ShowcasePromotionListener() {
        @Override
        public void onClick(View view, int position) {
            ItemPromotion mPromotion = mPromotionsItems.get(position);
            try{
                recordPromotionClick(mPromotion.getId());
                view.getContext().startActivity(new Intent(Intent.ACTION_VIEW).setData(Uri.parse(mPromotion.getPromotion_link())));
            } catch (Exception e){
                e.printStackTrace();
            }
        }
    });

    mPromotionsRv.setAdapter(mPromotionsAdapter);
    SnapHelper snapHelperStart = new GravitySnapHelper(Gravity.START);
    snapHelperStart.attachToRecyclerView(mPromotionsRv);


    RecyclerView.ItemAnimator animator = mPromotionsRv.getItemAnimator();
    if (animator instanceof SimpleItemAnimator) { ((SimpleItemAnimator) animator).setSupportsChangeAnimations(false); }

Answer 1

由于您的 RecyclerView 是水平的，请尝试使您的 RecyclerView 的宽度为“wrap_content”。