使用 gridlayout manager 將標題檢視新增到 recyclerview
要使用 gridlayout 向 Recyclerview 新增標題，首先需要告知介面卡標題檢視是第一個位置 - 而不是用於內容的標準單元格。接下來，必須告訴佈局管理器第一個位置的跨度應該等於整個列表的* span 計數。 *
定期使用 RecyclerView.Adapter 類並按如下方式對其進行配置：
public class HeaderAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final int ITEM_VIEW_TYPE_HEADER = 0;
private static final int ITEM_VIEW_TYPE_ITEM = 1;
private List<YourModel> mModelList;
public HeaderAdapter (List<YourModel> modelList) {
mModelList = modelList;
}
public boolean isHeader(int position) {
return position == 0;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
if (viewType == ITEM_VIEW_TYPE_HEADER) {
View headerView = inflater.inflate(R.layout.header, parent, false);
return new HeaderHolder(headerView);
}
View cellView = inflater.inflate(R.layout.gridcell, parent, false);
return new ModelHolder(cellView);
}
@Override
public int getItemViewType(int position) {
return isHeader(position) ? ITEM_VIEW_TYPE_HEADER : ITEM_VIEW_TYPE_ITEM;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder h, int position) {
if (isHeader(position)) {
return;
}
final YourModel model = mModelList.get(position -1 ); // Subtract 1 for header
ModelHolder holder = (ModelHolder) h;
// populate your holder with data from your model as usual
}
@Override
public int getItemCount() {
return _categories.size() + 1; // add one for the header
}
}
然後在 activity / fragment 中：
final HeaderAdapter adapter = new HeaderAdapter (mModelList);
final GridLayoutManager manager = new GridLayoutManager();
manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
@Override
public int getSpanSize(int position) {
return adapter.isHeader(position) ? manager.getSpanCount() : 1;
}
});
mRecyclerView.setLayoutManager(manager);
mRecyclerView.setAdapter(adapter);
除了標題之外或者代替標題，可以使用相同的方法新增頁尾。