public void refreshPinnedView() {
if (null == pinnedView || null == layoutManager) {
Logger.e(
TAG, "Please init pinnedView and layoutManager with initRecyclerPinned method first!");
return;
}
if (VISIBLE != pinnedView.getVisibility()) {
pinnedView.setVisibility(VISIBLE);
}
int curPosition = layoutManager.findFirstVisibleItemPosition();
if (RecyclerView.NO_POSITION == curPosition) {
return;
}
View curItemView = layoutManager.findViewByPosition(curPosition);
if (null == curItemView) {
return;
}
// 如果当前的curPosition和上次的lastPosition不一样，则说明需要重新刷新数据，避免curPosition一样的情况下重复刷新相同数据
if (curPosition != lastPosition) {
if (null != onRecyclerViewPinnedViewListener) {
onRecyclerViewPinnedViewListener.onPinnedViewRender(this, pinnedView, curPosition);
}
lastPosition = curPosition;
}
int displayTop;
int itemHeight = curItemView.getHeight();
int curTop = curItemView.getTop();
int floatHeight = pinnedView.getHeight();
if (curTop < floatHeight - itemHeight) {
displayTop = itemHeight + curTop - floatHeight;
} else {
displayTop = 0;
}
RelativeLayout.LayoutParams lp = (LayoutParams) pinnedView.getLayoutParams();
lp.topMargin = displayTop;
pinnedView.setLayoutParams(lp);
pinnedView.invalidate();
}
public void initRecyclerPinned(
RecyclerView recyclerView, ABaseLinearLayoutManager layoutManager, View pinnedView) {
this.pinnedView = pinnedView;
this.layoutManager = layoutManager;
this.addView(this.pinnedView);
RelativeLayout.LayoutParams lp =
new RelativeLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
this.pinnedView.setLayoutParams(lp);
layoutManager
.getRecyclerViewScrollManager()
.addScrollListener(
recyclerView,
new OnRecyclerViewScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
refreshPinnedView();
}
});
pinnedView.setVisibility(GONE);
}