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
感谢@Kushal,这是我实现它的方式
private boolean loading = true;
int pastVisiblesItems, visibleItemCount, totalItemCount;
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (dy > 0) { //check for scroll down
visibleItemCount = mLayoutManager.getChildCount();
totalItemCount = mLayoutManager.getItemCount();
pastVisiblesItems = mLayoutManager.findFirstVisibleItemPosition();
if (loading) {
if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
loading = false;
Log.v("...", "Last Item Wow !");
// Do pagination.. i.e. fetch new data
loading = true;
}
}
}
}
});
别忘了加上
LinearLayoutManager mLayoutManager;
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
其他回答
recyclerList.setOnScrollListener(new RecyclerView.OnScrollListener()
{
@Override
public void onScrolled(RecyclerView recyclerView, int dx,int dy)
{
super.onScrolled(recyclerView, dx, dy);
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView,int newState)
{
int totalItemCount = layoutManager.getItemCount();
int lastVisibleItem = layoutManager.findLastVisibleItemPosition();
if (totalItemCount> 1)
{
if (lastVisibleItem >= totalItemCount - 1)
{
// End has been reached
// do something
}
}
}
});
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
}
Create an abstract class and extends RecyclerView.OnScrollListener public abstract class EndlessRecyclerOnScrollListener extends RecyclerView.OnScrollListener { private int previousTotal = 0; private boolean loading = true; private int visibleThreshold; private int firstVisibleItem, visibleItemCount, totalItemCount; private RecyclerView.LayoutManager layoutManager; public EndlessRecyclerOnScrollListener(RecyclerView.LayoutManager layoutManager, int visibleThreshold) { this.layoutManager = layoutManager; this.visibleThreshold = visibleThreshold; } @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { super.onScrolled(recyclerView, dx, dy); visibleItemCount = recyclerView.getChildCount(); totalItemCount = layoutManager.getItemCount(); firstVisibleItem = ((LinearLayoutManager)layoutManager).findFirstVisibleItemPosition(); if (loading) { if (totalItemCount > previousTotal) { loading = false; previousTotal = totalItemCount; } } if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) { onLoadMore(); loading = true; } } public abstract void onLoadMore();} in activity (or fragment) add addOnScrollListener to recyclerView LinearLayoutManager mLayoutManager = new LinearLayoutManager(this); recyclerView.setLayoutManager(mLayoutManager); recyclerView.addOnScrollListener(new EndlessRecyclerOnScrollListener(mLayoutManager, 3) { @Override public void onLoadMore() { //TODO ... } });
我刚试了一下:
final LinearLayoutManager rvLayoutManager = new LinearLayoutManager(this);
rvMovieList = (RecyclerView) findViewById(R.id.rvMovieList);
rvMovieList.setLayoutManager(rvLayoutManager);
adapter = new MovieRecyclerAdapter(this, movies);
rvMovieList.setAdapter(adapter);
adapter.notifyDataSetChanged();
rvMovieList.addOnScrollListener(new OnScrollListener() {
boolean loading = true;
int pastVisiblesItems, visibleItemCount, totalItemCount;
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
visibleItemCount = rvLayoutManager.getChildCount();
totalItemCount = rvLayoutManager.getItemCount();
pastVisiblesItems = rvLayoutManager.findFirstVisibleItemPosition();
int lastitem = visibleItemCount + pastVisiblesItems;
if ( lastitem == totalItemCount
&& page < total_pages
&& !keyword.equals("") ) {
// hit bottom ..
String strnext;
if (page == total_pages - 1) {
int last = total_results - (page * 20);
strnext = String.format(getResources().getString(R.string.next), last);
} else {
strnext = String.format(getResources().getString(R.string.next), 20);
}
btNext.setText(strnext);
btNext.setVisibility(View.VISIBLE);
} else {
btNext.setVisibility(View.INVISIBLE);
}
if(pastVisiblesItems == 0 && page > 1){
// hit top
btPrev.setVisibility(View.VISIBLE);
} else {
btPrev.setVisibility(View.INVISIBLE);
}
}
});
我搞不清楚在哪里加载真或假,所以我试图删除它,这段代码工作如我所料。
有一个易于使用的名为paginate的库。支持ListView和RecyclerView(线性布局,GridLayout和StaggeredGridLayout)。
这是该项目在Github上的链接