如何在Android上实现“材料设计展开/折叠列表"? [英] How can I implement a Material Design Expand/Collapse List on Android?
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问题描述
我正在寻求实现这种风格的材料清单.如何在Android上执行此操作?我应该看什么课?是否有任何现有的库可以使实现这一过程变得容易?
I am looking to implement a material list of this style. How can I do this on Android? What classes should I look at? Are there any existing libraries that could make implementing this easy?
推荐答案
是的,您可以使用库 SectionedRecyclerViewAdapter .有一个完整的工作示例此处.
Yes, you can easily implement it with the library SectionedRecyclerViewAdapter. There is a full working example here.
基本上,您可以创建一个节类:
Basically you create a section class:
class MySection extends StatelessSection {
String title;
List<String> list;
boolean expanded = true; // true if you want it to be displayed expanded initially
public MySection(String title, List<String> list) {
// call constructor with layout resources for this Section header, footer and items
super(R.layout.section_header, R.layout.section_item);
this.title = title;
this.list = list;
}
@Override
public int getContentItemsTotal() {
return expanded? list.size() : 0;
}
@Override
public RecyclerView.ViewHolder getItemViewHolder(View view) {
// return a custom instance of ViewHolder for the items of this section
return new MyItemViewHolder(view);
}
@Override
public void onBindItemViewHolder(RecyclerView.ViewHolder holder, int position) {
MyItemViewHolder itemHolder = (MyItemViewHolder) holder;
// bind your view here
itemHolder.tvItem.setText(list.get(position));
}
@Override
public RecyclerView.ViewHolder getHeaderViewHolder(View view) {
return new SimpleHeaderViewHolder(view);
}
@Override
public void onBindHeaderViewHolder(RecyclerView.ViewHolder holder) {
MyHeaderViewHolder headerHolder = (MyHeaderViewHolder) holder;
// bind your header view here
headerHolder.tvItem.setText(title);
// handles the click on the header to toggle the expanded variable
headerHolder.rootView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
expanded = !expanded;
headerHolder.imgArrow.setImageResource(
expanded ? R.drawable.ic_keyboard_arrow_up_black_18dp : R.drawable.ic_keyboard_arrow_down_black_18dp
);
sectionAdapter.notifyDataSetChanged();
}
});
}
}
然后,使用您的部分设置RecyclerView:
Then you set up the RecyclerView with your sections:
// Create an instance of SectionedRecyclerViewAdapter
SectionedRecyclerViewAdapter sectionAdapter = new SectionedRecyclerViewAdapter();
// Create your sections with the list of data for each topic
MySection topic1Section = new MySection("Attractions", attractionsList);
MySection topic2Section = new MySection("Dining", diningList);
// Add your Sections to the adapter
sectionAdapter.addSection(topic1Section);
sectionAdapter.addSection(topic2Section);
// Set up your RecyclerView with the SectionedRecyclerViewAdapter
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
recyclerView.setAdapter(sectionAdapter);
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