在RecyclerView中加载更多项的一种常见方法是通过分页来实现。但是,如果想要避免使用分页,并且同时在列表末尾动态加载更多项,可以使用以下方法:
1.在RecyclerView的适配器中,添加一个监听器(OnLoadMoreListener),该监听器将在滚动到RecyclerView底部时触发加载更多项的操作。
public class MyAdapter extends RecyclerView.Adapter
private List- items;
private OnLoadMoreListener loadMoreListener;
private boolean isLoading;
private int visibleThreshold = 5;
private int lastVisibleItem, totalItemCount;
public MyAdapter(RecyclerView recyclerView, List
- items) {
this.items = items;
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);
totalItemCount = linearLayoutManager.getItemCount();
lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();
if (!isLoading && totalItemCount <= (lastVisibleItem + visibleThreshold)) {
if (loadMoreListener != null) {
loadMoreListener.onLoadMore();
}
isLoading = true;
}
}
});
}
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
//...
}
//...
public void setLoaded() {
isLoading = false;
}
//...
public void setOnLoadMoreListener(OnLoadMoreListener loadMoreListener) {
this.loadMoreListener = loadMoreListener;
}
public interface OnLoadMoreListener {
void onLoadMore();
}
}
2.实现OnLoadMoreListener接口,以便在需要加载更多项时执行操作。
myAdapter.setOnLoadMoreListener(new MyAdapter.OnLoadMoreListener() { @Override public void onLoadMore() { // 从API中获取数据,然