mRecyclerView滑动到底部的监听
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (mCurrentState == ACTION_IDLE && isLoadMoreEnabled && checkIfLoadMore()) {
mCurrentState = ACTION_LOAD_MORE_REFRESH;
mSwipeRefreshLayout.setEnabled(false);
listener.onRefresh(ACTION_LOAD_MORE_REFRESH);
}
}
});
checkIfLoadMore()
重点看一下checkIfLoadMore()这个方法,这个方法用来判断界面上最后一个位置和itemcount的比较,因为RecyclerView的LayoutManager有三种,这个如果用If else来进行判断,过于冗余,我们这个采用策略模式来进行编写。
public interface ILayoutManager {
int findLastVisiblePosition();
RecyclerView.LayoutManager getLayoutManager();
}
public class MyLinearLayoutManager extends LinearLayoutManager implements ILayoutManager {
public MyLinearLayoutManager(Context context) {
super(context);
}
public MyLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
public MyLinearLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
public RecyclerView.LayoutManager getLayoutManager() {
return this;
}
@Override
public int findLastVisiblePosition() {
return findLastVisibleItemPosition();
}
}
private boolean checkIfLoadMore() {
int lastVisibleItemPosition = mLayoutManager.findLastVisiblePosition();
int totalCount = mLayoutManager.getLayoutManager().getItemCount();
return totalCount - lastVisibleItemPosition < 5;
}
加载完成后
因为我们刷新和加载调用同一个接口,传递不同的参数,所以在操作完成后,我们需要进行判断,是哪种操作完成了
public void onRefreshCompleted() {
switch (mCurrentState) {
case ACTION_PULL_TO_REFRESH:
mSwipeRefreshLayout.setRefreshing(false);
break;
case ACTION_LOAD_MORE_REFRESH:
if (isPullToRefreshEnabled) {
mSwipeRefreshLayout.setEnabled(true);
}
break;
default:
break;
}
mCurrentState = ACTION_IDLE;
}
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