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
做这些变量。
private int previousTotal = 0;
private boolean loading = true;
private int visibleThreshold = 5;
int firstVisibleItem, visibleItemCount, totalItemCount;
设置为滚动回收视图。
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
visibleItemCount = mRecyclerView.getChildCount();
totalItemCount = mLayoutManager.getItemCount();
firstVisibleItem = mLayoutManager.findFirstVisibleItemPosition();
if (loading) {
if (totalItemCount > previousTotal) {
loading = false;
previousTotal = totalItemCount;
}
}
if (!loading && (totalItemCount - visibleItemCount)
<= (firstVisibleItem + visibleThreshold)) {
// End has been reached
Log.i("Yaeye!", "end called");
// Do something
loading = true;
}
}
});
注意:确保你使用LinearLayoutManager作为RecyclerView的布局管理器。
LinearLayoutManager mLayoutManager;
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
对于网格来说
GridLayoutManager mLayoutManager;
mLayoutManager = new GridLayoutManager(getActivity(), spanCount);
mRecyclerView.setLayoutManager(mLayoutManager);
有乐趣与你无尽的卷轴!!^ ^。
更新:mRecyclerView.setOnScrollListener()已弃用,只需替换为mRecyclerView.addOnScrollListener(),警告将消失!你可以从这个SO问题中读到更多。
由于Android现在正式支持Kotlin,这里是相同的更新-
使OnScrollListener
class OnScrollListener(val layoutManager: LinearLayoutManager, val adapter: RecyclerView.Adapter<RecyclerAdapter.ViewHolder>, val dataList: MutableList<Int>) : RecyclerView.OnScrollListener() {
var previousTotal = 0
var loading = true
val visibleThreshold = 10
var firstVisibleItem = 0
var visibleItemCount = 0
var totalItemCount = 0
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
visibleItemCount = recyclerView.childCount
totalItemCount = layoutManager.itemCount
firstVisibleItem = layoutManager.findFirstVisibleItemPosition()
if (loading) {
if (totalItemCount > previousTotal) {
loading = false
previousTotal = totalItemCount
}
}
if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
val initialSize = dataList.size
updateDataList(dataList)
val updatedSize = dataList.size
recyclerView.post { adapter.notifyItemRangeInserted(initialSize, updatedSize) }
loading = true
}
}
}
然后像这样把它添加到你的RecyclerView中
recyclerView.addOnScrollListener(OnScrollListener(layoutManager, adapter, dataList))
要获得完整的代码示例,请参阅Github repo。
其他回答
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);
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);
借助Kotlin扩展函数的强大功能,代码可以看起来更加优雅。把它放在你想要的任何地方(我把它放在一个ExtensionFunctions中。kt文件):
/**
* WARNING: This assumes the layout manager is a LinearLayoutManager
*/
fun RecyclerView.addOnScrolledToEnd(onScrolledToEnd: () -> Unit){
this.addOnScrollListener(object: RecyclerView.OnScrollListener(){
private val VISIBLE_THRESHOLD = 5
private var loading = true
private var previousTotal = 0
override fun onScrollStateChanged(recyclerView: RecyclerView,
newState: Int) {
with(layoutManager as LinearLayoutManager){
val visibleItemCount = childCount
val totalItemCount = itemCount
val firstVisibleItem = findFirstVisibleItemPosition()
if (loading && totalItemCount > previousTotal){
loading = false
previousTotal = totalItemCount
}
if(!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)){
onScrolledToEnd()
loading = true
}
}
}
})
}
然后像这样使用它:
youRecyclerView.addOnScrolledToEnd {
//What you want to do once the end is reached
}
这个解决方案基于Kushal Sharma的回答。然而,这是一个更好的,因为:
它使用onScrollStateChanged而不是onScroll。这样做比较好,因为每当RecyclerView中有任何类型的移动时,onScroll都会被调用,而onScrollStateChanged只在RecyclerView的状态改变时被调用。使用onScrollStateChanged将节省CPU时间,从而节省电池。 因为它使用扩展函数,所以可以在任何RecyclerView中使用。客户端代码只有一行。
if (layoutManager.findLastCompletelyVisibleItemPosition() ==
recyclerAdapter.getItemCount() - 1) {
//load more items.
}
公平而简单。 这是可行的。
我会尝试扩展使用的LayoutManager(例如LinearLayoutManager)和覆盖scrollVerticallyBy()方法。首先,我会先调用super,然后检查返回的整数值。如果值等于0,则到达底部或顶部边界。然后我将使用findLastVisibleItemPosition()方法来找出到达哪个边界,并在需要时加载更多数据。只是一个想法。
此外,您甚至可以从该方法中返回您的值,允许滚动并显示“loading”指示器。