如何在nestedscrollview中使用无限滚动recyclelerview？

Question

屏幕的高度不够，因为在一个屏幕上有许多项目包含两个回收视图。所以我尝试在nestedscrollview中创建子视图。但是，所有物品都会立即装入，或者回收者不会被回收。

所以我已经阅读了其他文章并尝试过，但它对我不起作用。

例如，添加app:layout_behavior="@string/appbar_scrolling_view_behavior"或mRecyclerView.setNestedScrollingEnabled(false);

如果您知道该怎么做，请告诉我。谢谢阅读。

这是我的java代码

myDataset = new ArrayList<>();
    mRecyclerView = (RecyclerView) rootView.findViewById(R.id.map_recycler_view);
    LinearLayoutManager mLayoutManager = new LinearLayoutManager(mcontext);
    mLayoutManager.setAutoMeasureEnabled(true);
    mRecyclerView.setLayoutManager(mLayoutManager);
    mAdapter = new MyAdapter(this);
    mAdapter.setLinearLayoutManager(mLayoutManager);
    mAdapter.setRecyclerView(mRecyclerView);
    mRecyclerView.setAdapter(mAdapter);

这是我的xml代码

<android.support.v4.widget.NestedScrollView
    android:id="@+id/nestedScrollView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">


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


        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="180dp">

            <fragment
                android:id="@+id/googleMap"
                android:name="com.google.android.gms.maps.SupportMapFragment"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />

        </FrameLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="200dp"
            android:orientation="vertical">



            <android.support.v7.widget.RecyclerView
                android:id="@+id/tag_recycler_view"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:descendantFocusability="blocksDescendants"
                app:layout_behavior="@string/appbar_scrolling_view_behavior"
                app:layoutManager="LinearLayoutManager">

            </android.support.v7.widget.RecyclerView>

        </LinearLayout>

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


                <android.support.v7.widget.RecyclerView
                    android:id="@+id/map_recycler_view"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:scrollbars="vertical"
                    android:nestedScrollingEnabled="false">
                </android.support.v7.widget.RecyclerView>

            </LinearLayout>

        </LinearLayout>

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

这是我的适配器代码它太多所以我上传相关的部分它在到达recyclerview的底部时添加一个新项目。

public interface OnLoadMoreListener {
    void onLoadMore();
}

public MyAdapter(OnLoadMoreListener onLoadMoreListener) {
    this.onLoadMoreListener = onLoadMoreListener;
    mDataset = new ArrayList<>();
}

public void setLinearLayoutManager(LinearLayoutManager linearLayoutManager) {
    this.mLinearLayoutManager = linearLayoutManager;
}

public void setRecyclerView(final RecyclerView mView) {
    mView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
            super.onScrollStateChanged(recyclerView, newState);

            if (newState == RecyclerView.SCROLL_STATE_SETTLING) {
                visibleItemCount = recyclerView.getChildCount();
                totalItemCount = mLinearLayoutManager.getItemCount();
                firstVisibleItem = mLinearLayoutManager.findFirstVisibleItemPosition();
                lastVisibleItem = mLinearLayoutManager.findLastVisibleItemPosition();

                if (!isMoreLoading && (totalItemCount - visibleItemCount)<= (firstVisibleItem + visibleThreshold)) {
                    if (onLoadMoreListener != null) {
                        onLoadMoreListener.onLoadMore();
                        isMoreLoading = true;
                    }
                }
            }
        }
    });
}

@Override
public int getItemViewType(int position) {
    return mDataset.get(position) != null ? VIEW_ITEM : VIEW_PROG;
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    if (viewType == VIEW_ITEM) {
        context = parent.getContext();
        return new StudentViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.home_contents, parent, false));
    } else {
        context = parent.getContext();
        return new ProgressViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_progress, parent, false));
    }
}

public void addAll(List<mainitem> lst) {
    mDataset.clear();
    mDataset.addAll(lst);
    notifyDataSetChanged();
}

public void addItemMore(List<mainitem> lst) {
    mDataset.addAll(lst);
    notifyItemRangeChanged(mDataset.size()-6, mDataset.size());
}


public void setMoreLoading(boolean isMoreLoading) {
    this.isMoreLoading=isMoreLoading;
}

@Override
public int getItemCount() {
    return mDataset.size();
}

public void setProgressMore(final boolean isProgress) {
    if (isProgress) {
        new Handler().post(new Runnable() {
            @Override
            public void run() {
                mDataset.add(null);
                notifyItemInserted(mDataset.size() - 1);
            }
        });
    } else if(!isProgress) {
        mDataset.remove(mDataset.size() - 1);
        notifyItemRemoved(mDataset.size()-1);
    }
}

Answer 1

使用android:nestedScrollingEnabled="false"到你的RecyclerView

<android.support.v7.widget.RecyclerView
    android:id="@+id/map_recycler_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:descendantFocusability="blocksDescendants"
    android:nestedScrollingEnabled="false"
    app:layoutManager="LinearLayoutManager"/>

Answer 2

以上解决方案只有在你使用21以上的api版本时才有效，如果你想用更低版本支持它请查看我的答案Stackoverflow Answer