我创建了一个以卡为主要视图类型的RecyclerView。我试图实现的是,当用户单击某个项目时,该项目的视图类型将从卡片更改为另一个视图类型(例如,可水平滚动放置的列表文本视图)。
我的RecyclerView适配器代码如下:
在下面的代码中,我创建了枚举类型的arrraylist,以跟踪recyclerview中每一行的单击状态,然后获取数据集的大小,并用show\u primary\u内容初始化每一行的arraylist
public class DisplayItemsAdapter extends RecyclerView.Adapter<DisplayItemsAdapter.ViewHolder> {
private static ArrayList<clickedState> itemClickedState;
private enum clickedState {
SHOW_PRIMARY_CONTENT,
SHOW_SECONDARY_CONTENT
}
private ArrayList<ItemData> mDataset = new ArrayList<>();
public DisplayItemsAdapter(ArrayList<ItemData> dataset) {
mDataset = dataset;
itemClickedState = new ArrayList<>();
for (int i = 0; i < mDataset.size(); i++) {
itemClickedState.add(i, clickedState.SHOW_PRIMARY_CONTENT);
}
}
下面是我的viewholder类,它保存对所有子视图的引用,它实现view.onclicklistener。它实现view.onclicklistener的原因是,它可以在单击的状态之间切换以相应地更改视图类型。
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
TextView tvItemName;
TextView tvItemNumber;
public ViewHolder(View itemView) {
super(itemView);
tvItemName = (TextView) itemView.findViewById(R.id.tvItemName);
tvItemNumber = (TextView) itemView.findViewById(R.id.tvItemNumber);
tvTicketClass = (TextView) itemView.findViewById(R.id.tvTicketClass);
}
@Override
public void onClick(View v) {
itemClickedState.add(getAdapterPosition(), clickedState.SHOW_SECONDARY_CONTENT);
}
}
这是我获取getitemviewtype返回的viewtype值并返回膨胀布局的地方
@Override
public DisplayItemsAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View v1 = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.display_Items_row, viewGroup, false);
View v2 = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.display_Items_ticket_class, viewGroup, false);
if (viewType == 0) {
return new ViewHolder(v1);
} else {
return new ViewHolder(v2);
}
}
然后在这里,我根据viewholderusing viewholder.getitemviewtype返回的viewtype将视图与值绑定
@Override
public void onBindViewHolder(DisplayItemsAdapter.ViewHolder viewHolder, final int position) {
if (viewHolder.getItemViewType() == 0) {
viewHolder.tvItemName.setText(mDataset.get(position).strItemName);
viewHolder.tvItemNumber.setText(mDataset.get(position).strItemNumber);
} else if (viewHolder.getItemViewType() == 1) {
for (int i = 0; i < mDataset.get(position).strClass.length; i++) {
viewHolder.tvTicketClass.setText(mDataset.get(position).strClass[i]);
}
}
}
@Override
public int getItemCount() {
return mDataset.size();
}
最后是我的getitemViewType逻辑
@Override
public int getItemViewType(int position) {
if (itemClickedState.get(position) == clickedState.SHOW_SECONDARY_CONTENT)
return 1;
return 0;
}
}
我不明白的是,为什么我运行代码时什么都不显示,,,对我来说一切都是有效的。帮助我!!!!!
最佳答案
看我的例子:
// RecycleItemObject.java
public class RecycleItemObject {
public static int LAYOUT_ITEM_PORTRAIN = 0;
public static int LAYOUT_ITEM_LANDSCAPE = 1;
private int type;
....................
/**
* @return get layout type of item
*/
public int getType() {
return type;
}
/**
* set layout type of item
* @param type
*/
public void setType(int type) {
this.type = type;
}
}
// adapter
public Holder onCreateViewHolder(ViewGroup parent, int viewType) {
View view;
if (viewType == RecycleItemObject.LAYOUT_ITEM_PORTRAIN) {
view = LayoutInflater.from(context).inflate(R.layout.item_recycle_view_main, parent, false);
} else {
view = LayoutInflater.from(context).inflate(R.layout.item_recycle_view_main_land, parent, false);
}
}
// event click item
@onClick....
curentObject.setType(RecycleItemObject.LAYOUT_ITEM_LANDSCAPE);
// notify item only
notifyItemChanged(itemPosition);
和我一起工作很好