onLoadMoreListener赢得';t停止加载-回收视图-Android
我有一个用户提要,如果当前用户正在跟踪,则将显示用户的帖子,目前我的onLoadMoreListener赢得';t停止加载-回收视图-Android,android,android-recyclerview,Android,Android Recyclerview,我有一个用户提要,如果当前用户正在跟踪,则将显示用户的帖子,目前我的loadMoreListener工作正常,当它们到达RecyclerView的底部时,将加载下一批图像。但是,当我到达列表中的最后一项(提要仅显示50篇文章)时,它将尝试加载更多内容,并导致OutOfMemoryException。我已经在适配器中限制了列表的大小,但目前我似乎无法确定用户何时触底以停止显示进度并停止OnLoadMoreListener触发。这就是我迄今为止所尝试的: 适配器构造函数: public Recyc
loadMoreListener
工作正常,当它们到达RecyclerView
的底部时,将加载下一批图像。但是,当我到达列表中的最后一项(提要仅显示50篇文章)时,它将尝试加载更多内容,并导致OutOfMemoryException
。我已经在适配器中限制了列表的大小,但目前我似乎无法确定用户何时触底以停止显示进度并停止OnLoadMoreListener触发。这就是我迄今为止所尝试的:
适配器构造函数:
public RecyclerViewAdapterAllFeeds(Context context,
final ArrayList<AllFeedsDataModel> previousPostsList, final boolean profile, RecyclerView recyclerView, final ProgressBar progressBar) {
this.context = context;
this.previousPostsList = previousPostsList;
this.profile = profile;
if(recyclerView.getLayoutManager() instanceof LinearLayoutManager){
final LinearLayoutManager linearLayoutManager = (LinearLayoutManager)recyclerView.getLayoutManager();
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
progressBar.setVisibility(View.VISIBLE);
if (getItemCount() > LOADED_POSTS - 2) {
totalItemCount = getItemCount();
// total_posts = getItemCount();
lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();
if (lastVisibleItem <= TOTAL_POSTS) {
if (!loading && totalItemCount <= (lastVisibleItem)) {
if (onLoadMoreListener != null) {
onLoadMoreListener.onLoadMore();
}
loading = true;
}
}
}
}
});
}
}
我的问题是,如果帖子总数小于限制,我如何停止加载,或者如何知道最终项目何时可见 首先创建EndlessRecycleWebScrollListener.java:
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
public abstract class EndlessRecyclerViewScrollListener extends RecyclerView.OnScrollListener {
// The minimum amount of items to have below your current scroll position
// before loading more.
private int visibleThreshold = 5;
// The current offset index of data you have loaded
private int currentPage = 0;
// The total number of items in the dataset after the last load
private int previousTotalItemCount = 0;
// True if we are still waiting for the last set of data to load.
private boolean loading = true;
// Sets the starting page index
private int startingPageIndex = 0;
RecyclerView.LayoutManager mLayoutManager;
public EndlessRecyclerViewScrollListener(LinearLayoutManager layoutManager) {
this.mLayoutManager = layoutManager;
}
public EndlessRecyclerViewScrollListener(GridLayoutManager layoutManager) {
this.mLayoutManager = layoutManager;
visibleThreshold = visibleThreshold * layoutManager.getSpanCount();
}
public EndlessRecyclerViewScrollListener(StaggeredGridLayoutManager layoutManager) {
this.mLayoutManager = layoutManager;
visibleThreshold = visibleThreshold * layoutManager.getSpanCount();
}
public int getLastVisibleItem(int[] lastVisibleItemPositions) {
int maxSize = 0;
for (int i = 0; i < lastVisibleItemPositions.length; i++) {
if (i == 0) {
maxSize = lastVisibleItemPositions[i];
} else if (lastVisibleItemPositions[i] > maxSize) {
maxSize = lastVisibleItemPositions[i];
}
}
return maxSize;
}
// This happens many times a second during a scroll, so be wary of the code you place here.
// We are given a few useful parameters to help us work out if we need to load some more data,
// but first we check if we are waiting for the previous load to finish.
@Override
public void onScrolled(RecyclerView view, int dx, int dy) {
int lastVisibleItemPosition = 0;
int totalItemCount = mLayoutManager.getItemCount();
if (mLayoutManager instanceof StaggeredGridLayoutManager) {
int[] lastVisibleItemPositions = ((StaggeredGridLayoutManager) mLayoutManager).findLastVisibleItemPositions(null);
// get maximum element within the list
lastVisibleItemPosition = getLastVisibleItem(lastVisibleItemPositions);
} else if (mLayoutManager instanceof LinearLayoutManager) {
lastVisibleItemPosition = ((LinearLayoutManager) mLayoutManager).findLastVisibleItemPosition();
} else if (mLayoutManager instanceof GridLayoutManager) {
lastVisibleItemPosition = ((GridLayoutManager) mLayoutManager).findLastVisibleItemPosition();
}
// If the total item count is zero and the previous isn't, assume the
// list is invalidated and should be reset back to initial state
if (totalItemCount < previousTotalItemCount) {
this.currentPage = this.startingPageIndex;
this.previousTotalItemCount = totalItemCount;
if (totalItemCount == 0) {
this.loading = true;
}
}
// If it’s still loading, we check to see if the dataset count has
// changed, if so we conclude it has finished loading and update the current page
// number and total item count.
if (loading && (totalItemCount > previousTotalItemCount)) {
loading = false;
previousTotalItemCount = totalItemCount;
}
// If it isn’t currently loading, we check to see if we have breached
// the visibleThreshold and need to reload more data.
// If we do need to reload some more data, we execute onLoadMore to fetch the data.
// threshold should reflect how many total columns there are too
if (!loading && (lastVisibleItemPosition + visibleThreshold) > totalItemCount) {
currentPage++;
onLoadMore(currentPage, totalItemCount);
loading = true;
}
}
// Defines the process for actually loading more data based on page
public abstract void onLoadMore(int page, int totalItemsCount);
}
查看我用于无限滚动的代码:
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
// if (BuildConfig.DEBUG)
// Log.d(TAG, "onScrolled: [x, y]=[" + dx + ", " + dy + "], count=[" + recyclerView.getLayoutManager().getChildCount() + ", " + recyclerView.getLayoutManager().getItemCount() + ", " + ((LinearLayoutManager) recyclerView.getLayoutManager()).findFirstVisibleItemPosition() + "]");
if (hasMoreRequest) {
if (dy > 0) { //check for scroll down
checkForMoreLoad();
}
}
}
});
private void checkForMoreLoad() {
final Handler handler = new Handler();
Runnable checkForMoreData = new Runnable() {
@Override
public void run() {
if (null != recyclerView) {
int visibleItemCount = recyclerView.getLayoutManager().getChildCount();
int totalItemCount = recyclerView.getLayoutManager().getItemCount();
int pastVisibleItems = ((LinearLayoutManager) recyclerView.getLayoutManager()).findFirstVisibleItemPosition();
onScrollToLoad(visibleItemCount, pastVisibleItems, totalItemCount);
}
}
};
handler.postDelayed(checkForMoreData, 100);
}
private void onScrollToLoad(int visibleItemCount, int pastVisibleItems, int totalItemCount) {
if ((visibleItemCount + pastVisibleItems) + 4 >= totalItemCount && hasMoreRequest) {
if (BuildConfig.DEBUG)
Log.d(TAG, "onScroll lastInScreen - so load more");
startNetworkCall(page + 1);
}
}
在从API获取数据之后,如果之后有更多数据,我将再次调用checkForMoreLoad()
在
onScrollToLoad()
中包含(visibleItemCount+pastVisibleItems)+4
的行中包含4
。这是为了在到达卷轴末端之前启动API。你能解释一下这对我的情况有什么好处吗?如果我将来想更改它,它是否适合任何数量的帖子?当你到达列表底部时,删除OnScrollListener。是的,这是所有数字的工作岗位。我会测试出来,让你知道巴德。我给它一个去巴德,让你know@BIW当然试着告诉我怎么用的我用了另一个答案伙计,还没测试过
recyclerView.addOnScrollListener(new EndlessRecyclerViewScrollListener(recyclerView.getLayoutManager()) {
@Override
public void onLoadMore(int page, int totalItemsCount) {
//TODO Add logic for load more posts or show message if posts is ended.
}
});
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
// if (BuildConfig.DEBUG)
// Log.d(TAG, "onScrolled: [x, y]=[" + dx + ", " + dy + "], count=[" + recyclerView.getLayoutManager().getChildCount() + ", " + recyclerView.getLayoutManager().getItemCount() + ", " + ((LinearLayoutManager) recyclerView.getLayoutManager()).findFirstVisibleItemPosition() + "]");
if (hasMoreRequest) {
if (dy > 0) { //check for scroll down
checkForMoreLoad();
}
}
}
});
private void checkForMoreLoad() {
final Handler handler = new Handler();
Runnable checkForMoreData = new Runnable() {
@Override
public void run() {
if (null != recyclerView) {
int visibleItemCount = recyclerView.getLayoutManager().getChildCount();
int totalItemCount = recyclerView.getLayoutManager().getItemCount();
int pastVisibleItems = ((LinearLayoutManager) recyclerView.getLayoutManager()).findFirstVisibleItemPosition();
onScrollToLoad(visibleItemCount, pastVisibleItems, totalItemCount);
}
}
};
handler.postDelayed(checkForMoreData, 100);
}
private void onScrollToLoad(int visibleItemCount, int pastVisibleItems, int totalItemCount) {
if ((visibleItemCount + pastVisibleItems) + 4 >= totalItemCount && hasMoreRequest) {
if (BuildConfig.DEBUG)
Log.d(TAG, "onScroll lastInScreen - so load more");
startNetworkCall(page + 1);
}
}