我想把ListView改为RecyclerView。我想在RecyclerView中使用OnScrollListener的onScroll来确定用户是否滚动到列表的末尾。
我如何知道用户是否滚动到列表的末尾以便我可以从REST服务获取新数据?
我想把ListView改为RecyclerView。我想在RecyclerView中使用OnScrollListener的onScroll来确定用户是否滚动到列表的末尾。
我如何知道用户是否滚动到列表的末尾以便我可以从REST服务获取新数据?
当前回答
这里我的解决方案使用AsyncListUtil,在网络上说: 注意,这个类使用一个线程来加载数据,所以它适合从二级存储(如磁盘)加载数据,但不适合从网络加载数据。 但是我使用odata来读取数据并工作良好。 我在示例中遗漏了数据实体和网络方法。 我只包括示例适配器。
public class AsyncPlatoAdapter extends RecyclerView.Adapter {
private final AsyncPlatoListUtil mAsyncListUtil;
private final MainActivity mActivity;
private final RecyclerView mRecyclerView;
private final String mFilter;
private final String mOrderby;
private final String mExpand;
public AsyncPlatoAdapter(String filter, String orderby, String expand, RecyclerView recyclerView, MainActivity activity) {
mFilter = filter;
mOrderby = orderby;
mExpand = expand;
mRecyclerView = recyclerView;
mActivity = activity;
mAsyncListUtil = new AsyncPlatoListUtil();
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).
inflate(R.layout.plato_cardview, parent, false);
// Create a ViewHolder to find and hold these view references, and
// register OnClick with the view holder:
return new PlatoViewHolderAsync(itemView, this);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
final Plato item = mAsyncListUtil.getItem(position);
PlatoViewHolderAsync vh = (PlatoViewHolderAsync) holder;
if (item != null) {
Integer imagen_id = item.Imagen_Id.get();
vh.getBinding().setVariable(BR.plato, item);
vh.getBinding().executePendingBindings();
vh.getImage().setVisibility(View.VISIBLE);
vh.getProgress().setVisibility(View.GONE);
String cacheName = null;
String urlString = null;
if (imagen_id != null) {
cacheName = String.format("imagenes/imagen/%d", imagen_id);
urlString = String.format("%s/menusapi/%s", MainActivity.ROOTPATH, cacheName);
}
ImageHelper.downloadBitmap(mActivity, vh.getImage(), vh.getProgress(), urlString, cacheName, position);
} else {
vh.getBinding().setVariable(BR.plato, item);
vh.getBinding().executePendingBindings();
//show progress while loading.
vh.getImage().setVisibility(View.GONE);
vh.getProgress().setVisibility(View.VISIBLE);
}
}
@Override
public int getItemCount() {
return mAsyncListUtil.getItemCount();
}
public class AsyncPlatoListUtil extends AsyncListUtil<Plato> {
/**
* Creates an AsyncListUtil.
*/
public AsyncPlatoListUtil() {
super(Plato.class, //my data class
10, //page size
new DataCallback<Plato>() {
@Override
public int refreshData() {
//get count calling ../$count ... odata endpoint
return countPlatos(mFilter, mOrderby, mExpand, mActivity);
}
@Override
public void fillData(Plato[] data, int startPosition, int itemCount) {
//get items from odata endpoint using $skip and $top
Platos p = loadPlatos(mFilter, mOrderby, mExpand, startPosition, itemCount, mActivity);
for (int i = 0; i < Math.min(itemCount, p.value.size()); i++) {
data[i] = p.value.get(i);
}
}
}, new ViewCallback() {
@Override
public void getItemRangeInto(int[] outRange) {
//i use LinearLayoutManager in the RecyclerView
LinearLayoutManager layoutManager = (LinearLayoutManager) mRecyclerView.getLayoutManager();
outRange[0] = layoutManager.findFirstVisibleItemPosition();
outRange[1] = layoutManager.findLastVisibleItemPosition();
}
@Override
public void onDataRefresh() {
mRecyclerView.getAdapter().notifyDataSetChanged();
}
@Override
public void onItemLoaded(int position) {
mRecyclerView.getAdapter().notifyItemChanged(position);
}
});
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
onRangeChanged();
}
});
}
}
}
其他回答
我让你接近我。对我来说没问题。
我希望这对你有所帮助。
/**
* Created by Daniel Pardo Ligorred on 03/03/2016.
*/
public abstract class BaseScrollListener extends RecyclerView.OnScrollListener {
protected RecyclerView.LayoutManager layoutManager;
public BaseScrollListener(RecyclerView.LayoutManager layoutManager) {
this.layoutManager = layoutManager;
this.init();
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
this.onScroll(recyclerView, this.getFirstVisibleItem(), this.layoutManager.getChildCount(), this.layoutManager.getItemCount(), dx, dy);
}
private int getFirstVisibleItem(){
if(this.layoutManager instanceof LinearLayoutManager){
return ((LinearLayoutManager) this.layoutManager).findFirstVisibleItemPosition();
} else if (this.layoutManager instanceof StaggeredGridLayoutManager){
int[] spanPositions = null; //Should be null -> StaggeredGridLayoutManager.findFirstVisibleItemPositions makes the work.
try{
return ((StaggeredGridLayoutManager) this.layoutManager).findFirstVisibleItemPositions(spanPositions)[0];
}catch (Exception ex){
// Do stuff...
}
}
return 0;
}
public abstract void init();
protected abstract void onScroll(RecyclerView recyclerView, int firstVisibleItem, int visibleItemCount, int totalItemCount, int dx, int dy);
}
有一个方法public void setOnScrollListener (RecyclerView。OnScrollListener监听器)在https://developer.android.com/reference/android/support/v7/widget/RecyclerView.html#setOnScrollListener%28android.support.v7.widget.RecyclerView.OnScrollListener%29。使用这个
编辑:
在onScrollListener中重写onScrollStateChanged方法并执行此操作
boolean loadMore = firstVisibleItem + visibleItemCount >= totalItemCount;
//loading is used to see if its already loading, you have to manually manipulate this boolean variable
if (loadMore && !loading) {
//end of list reached
}
这个解决方案对我来说非常有效。
//Listener
public abstract class InfiniteScrollListener extendsRecyclerView.OnScrollListener {
public static String TAG = InfiniteScrollListener.class.getSimpleName();
int firstVisibleItem, visibleItemCount, totalItemCount;
private int previousTotal = 0;
private boolean loading = true;
private int visibleThreshold = 1;
private int current_page = 1;
private LinearLayoutManager mLinearLayoutManager;
public InfiniteScrollListener(LinearLayoutManager linearLayoutManager) {
this.mLinearLayoutManager = linearLayoutManager;
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
visibleItemCount = recyclerView.getChildCount();
totalItemCount = mLinearLayoutManager.getItemCount();
firstVisibleItem = mLinearLayoutManager.findFirstVisibleItemPosition();
if (loading) {
if (totalItemCount > previousTotal) {
loading = false;
previousTotal = totalItemCount;
}
}
if (!loading && (totalItemCount - visibleItemCount - firstVisibleItem <= visibleThreshold)) {
current_page++;
onLoadMore(current_page);
loading = true;
}
}
public void resetState() {
loading = true;
previousTotal = 0;
current_page = 1;
}
public abstract void onLoadMore(int current_page);
}
//Implementation into fragment
private InfiniteScrollListener scrollListener;
scrollListener = new InfiniteScrollListener(manager) {
@Override
public void onLoadMore(int current_page) {
//Load data
}
};
rv.setLayoutManager(manager);
rv.addOnScrollListener(scrollListener);
虽然这个问题有很多答案,但我还是想分享一下我们创建无尽列表视图的经验。我们最近实现了自定义Carousel LayoutManager,可以在循环中无限滚动列表以及到某个点。下面是GitHub上的详细描述。
我建议您看看这篇关于创建自定义LayoutManagers的简短但有价值的建议:http://cases.azoft.com/create-custom-layoutmanager-android/
虽然接受的答案工作得很好,但下面的解决方案使用addOnScrollListener,因为setOnScrollListener已弃用,并减少了变量的数量,以及if条件。
final LinearLayoutManager layoutManager = new LinearLayoutManager(context);
feedsRecyclerView.setLayoutManager(layoutManager);
feedsRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (dy > 0) {
if ((layoutManager.getChildCount() + layoutManager.findFirstVisibleItemPosition()) >= layoutManager.getItemCount()) {
Log.d("TAG", "End of list");
//loadMore();
}
}
}
});