比较喜欢先上图
Android 原生ExpandableListView 是继承ListView绘制，可直接实现此UI，自行搜索使用
无论何种实现，均需我们手动转化数据源
实现方式简单，代码未优化，无扩展性，性能未知，勿喷
最下方有源码
方案一，加载所有数据通过控制itemview高度实现假折叠
平级数据，数据需要转化我们需要的
List<TestBean> list = new ArrayList<>();
list.add(new TestBean("这是数据 1", 1, true, true));
list.add(new TestBean("这是数据 1 子项", 1));
list.add(new TestBean("这是数据 1 子项", 1));
list.add(new TestBean("这是数据 1 子项", 1));
list.add(new TestBean("这是数据 1 子项", 1));
list.add(new TestBean("这是数据 2", 2, true, true));
list.add(new TestBean("这是数据 2 子项", 2));
list.add(new TestBean("这是数据 2 子项", 2));
list.add(new TestBean("这是数据 2 子项", 2));
list.add(new TestBean("这是数据 3", 3, true, true));
list.add(new TestBean("这是数据 3 子项", 3));
list.add(new TestBean("这是数据 3 子项", 3));
list.add(new TestBean("这是数据 4", 4, true, false));
list.add(new TestBean("这是数据 5", 5, true, true));
list.add(new TestBean("这是数据 5 子项", 5));
list.add(new TestBean("这是数据 5 子项", 5));
list.add(new TestBean("这是数据 5 子项", 5));
list.add(new TestBean("这是数据 6", 6, true, true));
list.add(new TestBean("这是数据 6 子项", 6));
list.add(new TestBean("这是数据 6 子项", 6));
list.add(new TestBean("这是数据 6 子项", 6));
list.add(new TestBean("这是数据 6 子项", 6));
list.add(new TestBean("这是数据 6 子项", 6));
adapter实现
public class RecyclerViewFoldingAdapter extends RecyclerView.Adapter<RecyclerViewFoldingAdapter.FoldingViewHolder> {
private Context context;
private List<TestBean> list;
public RecyclerViewFoldingAdapter(Context context, List<TestBean> list) {
this.context = context;
this.list = list;
}
@NonNull
@Override
public RecyclerViewFoldingAdapter.FoldingViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_view, parent, false);
return new FoldingViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull RecyclerViewFoldingAdapter.FoldingViewHolder viewHolder, int position) {
final TestBean testBean = list.get(position);
ViewGroup.LayoutParams layoutParams = viewHolder.itemView.getLayoutParams();
if (testBean.isMain()){
viewHolder.textView.setText(testBean.getId() + " " + testBean.getTitle());
if (testBean.isHasChild()){
viewHolder.imageView.setVisibility(View.VISIBLE);
} else {
viewHolder.imageView.setVisibility(View.GONE);
}
if (testBean.isFolding()){
viewHolder.imageView.setImageResource(R.drawable.down);
} else {
viewHolder.imageView.setImageResource(R.drawable.up);
}
layoutParams.height = TestBean.dp2px(context, 50);
} else {
viewHolder.textView.setText(" " + testBean.getTitle());
if (testBean.isFolding()){
layoutParams.height = 0;
} else {
layoutParams.height = TestBean.dp2px(context, 50);
}
viewHolder.imageView.setVisibility(View.GONE);
}
viewHolder.itemView.setLayoutParams(layoutParams);
viewHolder.imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
testBean.setFolding(!testBean.isFolding());
changeItem(testBean);
notifyDataSetChanged();
}
});
}
private void changeItem(TestBean testBean) {
for (TestBean bean : list) {
if (testBean.getId() == bean.getId() && !bean.isMain()){
bean.setFolding(testBean.isFolding());
}
}
}
@Override
public int getItemCount() {
return list.size();
}
static class FoldingViewHolder extends RecyclerView.ViewHolder{
TextView textView;
ImageView imageView;
public FoldingViewHolder(@NonNull View itemView) {
super(itemView);
textView = itemView.findViewById(R.id.tv);
imageView = itemView.findViewById(R.id.iv);
}
}
}
方案二，通过数据源 list.add和remove方式更新到adapter中实现假折叠
数据源，list中bean带有自己List<bean> beans
List<TestBean> list = new ArrayList<>();
TestBean bean1 = new TestBean("这是数据 1", 1,true, true);
list.add(bean1);
bean1.getBeans().add(new TestBean("这是数据 1 子项"));
bean1.getBeans().add(new TestBean("这是数据 1 子项"));
bean1.getBeans().add(new TestBean("这是数据 1 子项"));
bean1.getBeans().add(new TestBean("这是数据 1 子项"));
TestBean bean2 = new TestBean("这是数据 2", 2,true, true);
list.add(bean2);
bean2.getBeans().add(new TestBean("这是数据 2 子项"));
bean2.getBeans().add(new TestBean("这是数据 2 子项"));
bean2.getBeans().add(new TestBean("这是数据 2 子项"));
TestBean bean3 = new TestBean("这是数据 3", 3,true, true);
list.add(bean3);
bean3.getBeans().add(new TestBean("这是数据 3 子项"));
bean3.getBeans().add(new TestBean("这是数据 3 子项"));
list.add(new TestBean("这是数据 4", 4, true, false));
TestBean bean5 = new TestBean("这是数据 5", 5,true, true);
list.add(bean5);
bean5.getBeans().add(new TestBean("这是数据 5 子项"));
bean5.getBeans().add(new TestBean("这是数据 5 子项"));
bean5.getBeans().add(new TestBean("这是数据 5 子项"));
TestBean bean6 = new TestBean("这是数据 6", 6, true, true);
list.add(bean6);
bean6.getBeans().add(new TestBean("这是数据 6 子项"));
bean6.getBeans().add(new TestBean("这是数据 6 子项"));
bean6.getBeans().add(new TestBean("这是数据 6 子项"));
bean6.getBeans().add(new TestBean("这是数据 6 子项"));
bean6.getBeans().add(new TestBean("这是数据 6 子项"));
适配器
public class RecyclerViewFoldingAdapter2 extends RecyclerView.Adapter<RecyclerViewFoldingAdapter2.FoldingViewHolder> {
private Context context;
private List<TestBean> list;
public RecyclerViewFoldingAdapter2(Context context, List<TestBean> list) {
this.context = context;
this.list = list;
}
@NonNull
@Override
public RecyclerViewFoldingAdapter2.FoldingViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_view, parent, false);
return new FoldingViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull RecyclerViewFoldingAdapter2.FoldingViewHolder viewHolder, final int position) {
final TestBean testBean = list.get(position);
if (testBean.isMain()){
viewHolder.textView.setText(testBean.getId() + " " + testBean.getTitle());
if (testBean.isHasChild()){
viewHolder.imageView.setVisibility(View.VISIBLE);
if (testBean.isFolding()){
viewHolder.imageView.setImageResource(R.drawable.down);
} else {
viewHolder.imageView.setImageResource(R.drawable.up);
}
} else {
viewHolder.imageView.setVisibility(View.GONE);
}
} else {
viewHolder.textView.setText(" " + testBean.getTitle());
viewHolder.imageView.setVisibility(View.GONE);
}
viewHolder.imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
testBean.setFolding(!testBean.isFolding());
changeItem(position, testBean.isFolding());
notifyDataSetChanged();
}
});
}
@Override
public int getItemCount() {
return list.size();
}
private void changeItem(int index, boolean isFold){
TestBean bean = list.get(index);
if (isFold){
list.removeAll(bean.getBeans());
} else {
list.addAll(index + 1, bean.getBeans());
}
notifyDataSetChanged();
}
static class FoldingViewHolder extends RecyclerView.ViewHolder{
TextView textView;
ImageView imageView;
public FoldingViewHolder(@NonNull View itemView) {
super(itemView);
textView = itemView.findViewById(R.id.tv);
imageView = itemView.findViewById(R.id.iv);
}
}
}
以上代码只是实现效果，未做优化，只是提供这个实现思路而已，如需使用请同学自行优化代码
码云 ---->>> https://gitee.com/woslxm_limeng/fold_recyclerview.git
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