为默认recyclerView创建展开动画,可以通过以下步骤实现:
以下是一个示例代码:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private List<Item> itemList;
public MyAdapter(List<Item> itemList) {
this.itemList = itemList;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
Item item = itemList.get(position);
holder.bind(item);
}
@Override
public int getItemCount() {
return itemList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private TextView titleTextView;
private TextView contentTextView;
private boolean isExpanded;
public ViewHolder(View itemView) {
super(itemView);
titleTextView = itemView.findViewById(R.id.titleTextView);
contentTextView = itemView.findViewById(R.id.contentTextView);
itemView.setOnClickListener(this);
}
public void bind(Item item) {
titleTextView.setText(item.getTitle());
if (isExpanded) {
contentTextView.setVisibility(View.VISIBLE);
} else {
contentTextView.setVisibility(View.GONE);
}
}
@Override
public void onClick(View v) {
isExpanded = !isExpanded;
notifyItemChanged(getAdapterPosition());
}
}
}
这样,当用户点击列表项时,列表项的展开状态会切换,并且会有展开动画效果。你可以根据实际需求自定义展开动画的效果。
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