blocks|key|5504871|text|从here获取示例代码实现|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5504872|在ViewHolder的onClick中设置ValueAnimator|5504873|@Override
public+void+onClick(final+View+view)+{
++++if+(mOriginalHeight+==+0)+{
++++++++mOriginalHeight+=+view.getHeight();
++++}
++++ValueAnimator+valueAnimator;
++++if+(!mIsViewExpanded)+{
++++++++mIsViewExpanded+=+true;
++++++++valueAnimator+=+ValueAnimator.ofInt(mOriginalHeight,+mOriginalHeight+%2B+(int)+(mOriginalHeight+*+1.5));
++++}+else+{
++++++++mIsViewExpanded+=+false;
++++++++valueAnimator+=+ValueAnimator.ofInt(mOriginalHeight+%2B+(int)+(mOriginalHeight+*+1.5),+mOriginalHeight);
++++}
++++valueAnimator.setDuration(300);
++++valueAnimator.setInterpolator(new+LinearInterpolator());
++++valueAnimator.addUpdateListener(new+ValueAnimator.AnimatorUpdateListener()+{
++++++++public+void+onAnimationUpdate(ValueAnimator+animation)+{
++++++++++++Integer+value+=+(Integer)+animation.getAnimatedValue();
++++++++++++view.getLayoutParams().height+=+value.intValue();
++++++++++++view.requestLayout();
++++++++}
++++});
++++valueAnimator.start();

}|code-block|syntax|javascript|5504874|以下是最终的代码|5504875|public+class+ViewHolder+extends+RecyclerView.ViewHolder+implements+View.OnClickListener+{
++++private+TextView+mFriendName;
++++private+int+mOriginalHeight+=+0;
++++private+boolean+mIsViewExpanded+=+false;


++++public+ViewHolder(RelativeLayout+v)+{
++++++++super(v);
++++++++mFriendName+=+(TextView)+v.findViewById(R.id.friendName);
++++++++v.setOnClickListener(this);
++++}

++++@Override
++++public+void+onClick(final+View+view)+{
++++++++if+(mOriginalHeight+==+0)+{
++++++++++++mOriginalHeight+=+view.getHeight();
++++++++}
++++++++ValueAnimator+valueAnimator;
++++++++if+(!mIsViewExpanded)+{
++++++++++++mIsViewExpanded+=+true;
++++++++++++valueAnimator+=+ValueAnimator.ofInt(mOriginalHeight,+mOriginalHeight+%2B+(int)+(mOriginalHeight+*+1.5));
++++++++}+else+{
++++++++++++mIsViewExpanded+=+false;
++++++++++++valueAnimator+=+ValueAnimator.ofInt(mOriginalHeight+%2B+(int)+(mOriginalHeight+*+1.5),+mOriginalHeight);
++++++++}
++++++++valueAnimator.setDuration(300);
++++++++valueAnimator.setInterpolator(new+LinearInterpolator());
++++++++valueAnimator.addUpdateListener(new+ValueAnimator.AnimatorUpdateListener()+{
++++++++++++public+void+onAnimationUpdate(ValueAnimator+animation)+{
++++++++++++++++Integer+value+=+(Integer)+animation.getAnimatedValue();
++++++++++++++++view.getLayoutParams().height+=+value.intValue();
++++++++++++++++view.requestLayout();
++++++++++++}
++++++++});
++++++++valueAnimator.start();

++++}
}|5504876|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/training/material/lists-cards.html^0|1|4|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|13|8|@]|9|@]|C|$I|J]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

Get the sample code implementation from <a href="https://developer.android.com/training/material/lists-cards.html" rel="nofollow noreferrer">here</a>

Set ValueAnimator inside onClick of ViewHolder

<pre><code>@Override
public void onClick(final View view) {
 if (mOriginalHeight == 0) {
 mOriginalHeight = view.getHeight();
 }
 ValueAnimator valueAnimator;
 if (!mIsViewExpanded) {
 mIsViewExpanded = true;
 valueAnimator = ValueAnimator.ofInt(mOriginalHeight, mOriginalHeight + (int) (mOriginalHeight * 1.5));
 } else {
 mIsViewExpanded = false;
 valueAnimator = ValueAnimator.ofInt(mOriginalHeight + (int) (mOriginalHeight * 1.5), mOriginalHeight);
 }
 valueAnimator.setDuration(300);
 valueAnimator.setInterpolator(new LinearInterpolator());
 valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
 public void onAnimationUpdate(ValueAnimator animation) {
 Integer value = (Integer) animation.getAnimatedValue();
 view.getLayoutParams().height = value.intValue();
 view.requestLayout();
 }
 });
 valueAnimator.start();

}
</code></pre>

Here is the final code

<pre><code>public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
 private TextView mFriendName;
 private int mOriginalHeight = 0;
 private boolean mIsViewExpanded = false;


 public ViewHolder(RelativeLayout v) {
 super(v);
 mFriendName = (TextView) v.findViewById(R.id.friendName);
 v.setOnClickListener(this);
 }

 @Override
 public void onClick(final View view) {
 if (mOriginalHeight == 0) {
 mOriginalHeight = view.getHeight();
 }
 ValueAnimator valueAnimator;
 if (!mIsViewExpanded) {
 mIsViewExpanded = true;
 valueAnimator = ValueAnimator.ofInt(mOriginalHeight, mOriginalHeight + (int) (mOriginalHeight * 1.5));
 } else {
 mIsViewExpanded = false;
 valueAnimator = ValueAnimator.ofInt(mOriginalHeight + (int) (mOriginalHeight * 1.5), mOriginalHeight);
 }
 valueAnimator.setDuration(300);
 valueAnimator.setInterpolator(new LinearInterpolator());
 valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
 public void onAnimationUpdate(ValueAnimator animation) {
 Integer value = (Integer) animation.getAnimatedValue();
 view.getLayoutParams().height = value.intValue();
 view.requestLayout();
 }
 });
 valueAnimator.start();

 }
}
</code></pre>

blocks|key|1608830|text|有人抱怨说，上面提到的解决方案不能用于列表视图作为可扩展的内容。但有一个简单的解决方案:创建一个列表视图，并用您的行手动填充此列表视图。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1608831|懒惰人的解决方案：如果你不想过多地修改代码，有一个简单的解决方案。只需手动使用适配器创建视图并将其添加到LinearLayout即可。|offset|length|style|BOLD|CODE|1608832|示例如下：|1608833|if+(mIsExpanded)
{
++++//+llExpandable...+is+the+expandable+nested+LinearLayout
++++llExpandable.removeAllViews();
++++final+ArrayAdapter<?>+adapter+=+...+//+create+your+adapter+as+if+you+would+use+it+for+a+ListView
++++for+(int+i+=+0;+i+<+adapter.getCount();+i%2B%2B)
++++{
++++++++View+item+=+adapter.getView(i,+null,+null);
++++++++//+if+you+want+the+item+to+be+selectable+as+if+it+would+be+in+a+default+ListView,+then+you+can+add+following+code+as+well:
++++++++item.setBackgroundResource(Functions.getThemeReference(context,+android.R.attr.selectableItemBackground));
++++++++item.setTag(i);
++++++++item.setOnClickListener(new+View.OnClickListener()+{
++++++++++++@Override
++++++++++++public+void+onClick(View+v)+{
++++++++++++++++//+item+would+be+retrieved+with:+
++++++++++++++++//+adapter.getItem((Integer)v.getTag())
++++++++++++}
++++++++});
++++++++llExpandable.addView(item);
++++}
++++ExpandUtils.expand(llExpandable,+null,+500);
}
else
{
++++ExpandUtils.collapse(llExpandable,+null,+500);
}|code-block|syntax|javascript|1608834|助手函数:+getThemeReference|1608835|public+static+int+getThemeReference(Context+context,+int+attribute)
{
++++TypedValue+typeValue+=+new+TypedValue();
++++context.getTheme().resolveAttribute(attribute,+typeValue,+false);
++++if+(typeValue.type+==+TypedValue.TYPE_REFERENCE)
++++{
++++++++int+ref+=+typeValue.data;
++++++++return+ref;
++++}
++++else
++++{
++++++++return+-1;
++++}
}|1608836|帮助器类:+ExpandUtils|1608837|Kavin+Varnan已经知道如何设置布局的动画了。但是如果你想使用我的类，请随意使用，我发布了一个要点：https://gist.github.com/MichaelFlisar/738dfa03a1579cc7338a|1608838|entityMap|0|LINK|mutability|MUTABLE|url|https://gist.github.com/MichaelFlisar/738dfa03a1579cc7338a^0|0|4|5|1G|C|0|0|0|0|N|0|0|0|H|0|1I|1M|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|16|8|@$D|17|E|18|F|G]|$D|19|E|1A|F|H]]|9|@]|A|$]]|$1|I|3|J|5|6|7|1B|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|1C|8|@]|9|@]|A|$N|O]]|$1|P|3|Q|5|6|7|1D|8|@$D|1E|E|1F|F|G]]|9|@]|A|$]]|$1|R|3|S|5|M|7|1G|8|@]|9|@]|A|$N|O]]|$1|T|3|U|5|6|7|1H|8|@$D|1I|E|1J|F|G]]|9|@]|A|$]]|$1|V|3|W|5|6|7|1K|8|@]|9|@$D|1L|E|1M|1|1N]]|A|$]]|$1|X|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]]|Y|$Z|$5|10|11|12|A|$13|14]]]]

Someone complained about that the above mentioned solution is not usable with a listview as expandable content. But there's a simple solution: create a listview and fill this listview manually with your rows.

Solution for the lazy ones: there's a simple solution if you don't want to change your code to much. Just manually use your adapter to create views and add them to the <code>LinearLayout</code>.

Here's the example:

<pre><code>if (mIsExpanded)
{
 // llExpandable... is the expandable nested LinearLayout
 llExpandable.removeAllViews();
 final ArrayAdapter&lt;?&gt; adapter = ... // create your adapter as if you would use it for a ListView
 for (int i = 0; i &lt; adapter.getCount(); i++)
 {
 View item = adapter.getView(i, null, null);
 // if you want the item to be selectable as if it would be in a default ListView, then you can add following code as well:
 item.setBackgroundResource(Functions.getThemeReference(context, android.R.attr.selectableItemBackground));
 item.setTag(i);
 item.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 // item would be retrieved with: 
 // adapter.getItem((Integer)v.getTag())
 }
 });
 llExpandable.addView(item);
 }
 ExpandUtils.expand(llExpandable, null, 500);
}
else
{
 ExpandUtils.collapse(llExpandable, null, 500);
}
</code></pre>

helper functions: getThemeReference

<pre><code>public static int getThemeReference(Context context, int attribute)
{
 TypedValue typeValue = new TypedValue();
 context.getTheme().resolveAttribute(attribute, typeValue, false);
 if (typeValue.type == TypedValue.TYPE_REFERENCE)
 {
 int ref = typeValue.data;
 return ref;
 }
 else
 {
 return -1;
 }
}
</code></pre>

helper class: ExpandUtils

Kavin Varnan postet already how to animate a layout...
But if you want to use my class, feel free to do so, I posted a gist: <a href="https://gist.github.com/MichaelFlisar/738dfa03a1579cc7338a" rel="nofollow">https://gist.github.com/MichaelFlisar/738dfa03a1579cc7338a</a>

blocks|key|4086962|text|https://github.com/gabrielemariotti/cardslib|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4086963|这个库实现了一个带有回收视图的可扩展列表(请参阅"CardViewNative“-->+"+list，Grid，and+RecyclerView”-->+"Expandable“下的演示应用程序)。它还有很多其他很酷的卡片/列表组合。|4086964|entityMap|0|LINK|mutability|MUTABLE|url^0|0|18|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@$A|N|B|O|1|P]]|C|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|4]]]]

<a href="https://github.com/gabrielemariotti/cardslib" rel="nofollow">https://github.com/gabrielemariotti/cardslib</a>

This library has an implementation of an expandable list with a recyclerview (refer to the demo app under "CardViewNative" --> "List, Grid, and RecyclerView" --> "Expandable cards"). It also has a lot of other cool combinations of cards/lists.

blocks|key|1608866|text|使用常用的LayoutManagers很容易做到这一点，这完全取决于您如何管理适配器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1608867|当您想要展开一个部分时，您只需将新项添加到您的适配器的标题之后。执行此操作时，请记住调用notifyItemRangeInserted。要折叠一个部分，只需移除相关项，然后调用notifyItemRangeRemoved()。对于适当通知的任何数据更改，回收器视图将对视图进行动画处理。添加项目时，将创建一个新项目填充的区域，新项目逐渐淡入。删除是相反的。除了适配器之外，您需要做的就是设计视图样式，以便将逻辑结构传达给用户。|1608868|更新:+Ryan+Brooks现在已经写了一个关于如何做到这一点的article。|offset|length|1608869|entityMap|0|LINK|mutability|MUTABLE|url|https://www.bignerdranch.com/blog/expand-a-recyclerview-in-four-steps/?utm_source=Android%2BWeekly&utm_campaign=8f0cc3ff1f-Android_Weekly_165&utm_medium=email&utm_term=0_4eb677ad19-8f0cc3ff1f-337834121^0|0|0|X|7|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

This is simple to do with the stock LayoutManagers, it all depends on how you manage your adapter. 

When you want to expand a section you just add new items to your adapter after the header. Remember to call notifyItemRangeInserted when you do this. To collapse a section you simply remove the relevant items, and call notifyItemRangeRemoved(). For any data changes that are appropriately notified, the recycler view will animate the views. When adding items, an area to be filled with the new items is made, with the new items fading in. Removal is the opposite. All you need to do besides the adapter stuff is to style your views to convey the logical structure to the user.

Update: Ryan Brooks has now written an <a href="https://www.bignerdranch.com/blog/expand-a-recyclerview-in-four-steps/?utm_source=Android+Weekly&amp;utm_campaign=8f0cc3ff1f-Android_Weekly_165&amp;utm_medium=email&amp;utm_term=0_4eb677ad19-8f0cc3ff1f-337834121">article</a> on how to do this.

blocks|key|4087017|text|您可以使用类似于平滑展开/折叠动画CheckBox的ExpandableLayout，因此可以在ListView和RecyclerView中将其用作CheckBox。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4087018|https://github.com/KyoSherlock/ExpandableLayout|offset|length|4087019|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1B|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

You can use ExpandableLayout that like a smooth expand/collapse animation CheckBox, so you can use it as CheckBox in ListView and RecyclerView.

<a href="https://github.com/KyoSherlock/ExpandableLayout" rel="nofollow">https://github.com/KyoSherlock/ExpandableLayout</a>

blocks|key|5505009|text|这是@TonicArtos中提到的示例代码，用于添加和移除项目以及在执行操作时对其进行动画处理，此代码取自RecyclerView+Animations和GitHub+sample|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|5505010|1)在onCreateViewHolder()中添加侦听器以注册onClick|5505011|2)在适配器中创建自定义OnClickListener|5505012|private+View.OnClickListener+mItemListener+=+new+View.OnClickListener()+{
++++@Override
++++public+void+onClick(View+v)+{
++++++++TextView+tv+=+(TextView)+v.findViewById(R.id.tvItems);
++++++++String+selected+=+tv.getText().toString();
++++++++boolean+checked+=+itemsList.get(recyclerView.getChildAdapterPosition(v)).isChecked();

++++++++switch+(selected){
++++++++++++case+"Item1":
++++++++++++++++if(checked){
++++++++++++++++++++deleteItem(v);
++++++++++++++++++++itemsList.get(recyclerView.getChildAdapterPosition(v)).setChecked(false);
++++++++++++++++}else+{
++++++++++++++++++++addItem(v);
++++++++++++++++++++itemsList.get(recyclerView.getChildAdapterPosition(v)).setChecked(true);
++++++++++++++++}
++++++++++++++++break;
++++++++++++case+"Item2":
++++++++++++++++if(checked){
++++++++++++++++++++deleteItem(v);
++++++++++++++++++++itemsList.get(recyclerView.getChildAdapterPosition(v)).setChecked(false);
++++++++++++++++}else+{
++++++++++++++++++++addItem(v);
++++++++++++++++++++itemsList.get(recyclerView.getChildAdapterPosition(v)).setChecked(true);
++++++++++++++++}
++++++++++++++++break;+++++++++++++++++
++++++++++++default:
++++++++++++++++//In+my+case+I+have+checkList+in+subItems,
++++++++++++++++//checkItem(v);
++++++++++++++++break;
++++++++}
++++}
};|code-block|syntax|javascript|5505013|3)添加您的addItem()和deleteItem()|5505014|private+void+addItem(View+view){
++++int+position+=+recyclerView.getChildLayoutPosition(view);
++++if+(position+!=+RecyclerView.NO_POSITION){
++++++++navDrawItems.add(position%2B1,new+mObject());
++++++++navDrawItems.add(position%2B2,new+mObject());
++++++++notifyItemRangeInserted(position%2B1,2);
++++}
}


private+void+deleteItem(View+view)+{
++++int+position+=+recyclerView.getChildLayoutPosition(view);
++++if+(position+!=+RecyclerView.NO_POSITION)+{
++++++++navDrawItems.remove(position%2B2);
++++++++navDrawItems.remove(position%2B1);
++++++++notifyItemRangeRemoved(position%2B1,2);
++++}
}|5505015|4)+如果您的适配器与回收器视图不在同一活动中，请在创建时将recyclerView的实例传递给RecyclerViewAdapter|5505016|5)+itemList是一个mObject类型的ArrayList，它帮助维护项目(打开/关闭)、名称、项目类型(子项目/主项目)的状态，并根据值设置主题|5505017|public+class+mObject{
++++private+String+label;
++++private+int+type;
++++private+boolean+checked;
}+|5505018|entityMap|0|LINK|mutability|MUTABLE|url|https://www.youtube.com/watch?v=imsr8NrIAMs|1|https://github.com/google/android-ui-toolkit-demos/blob/master/RecyclerView/RecyclerViewAnimations/app/src/main/java/examples/android/com/recyclerviewanimations/MainActivity.java^0|2|B|1H|N|0|25|D|1|0|0|2|3|K|0|0|2|C|F|0|0|0|2|0|0|0|2|3|D|U|C|0|0|2|E|7|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@$9|1B|A|1C|1|1D]|$9|1E|A|1F|1|1G]]|E|$]]|$1|F|3|G|5|6|7|1H|8|@$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1M|8|@$9|1N|A|1O|B|C]|$9|1P|A|1Q|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|1R|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1S|8|@$9|1T|A|1U|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|L|7|1V|8|@]|D|@]|E|$M|N]]|$1|S|3|T|5|6|7|1W|8|@$9|1X|A|1Y|B|C]|$9|1Z|A|20|B|C]|$9|21|A|22|B|C]]|D|@]|E|$]]|$1|U|3|V|5|6|7|23|8|@$9|24|A|25|B|C]|$9|26|A|27|B|C]]|D|@]|E|$]]|$1|W|3|X|5|L|7|28|8|@]|D|@]|E|$M|N]]|$1|Y|3|-4|5|6|7|29|8|@]|D|@]|E|$]]]|Z|$10|$5|11|12|13|E|$14|15]]|16|$5|11|12|13|E|$14|17]]]]

This is the sample code for what is mentioned by @TonicArtos to add and remove Items and to animate it while doing, this is taken from <a href="https://www.youtube.com/watch?v=imsr8NrIAMs" rel="nofollow">RecyclerView Animations</a> and <a href="https://github.com/google/android-ui-toolkit-demos/blob/master/RecyclerView/RecyclerViewAnimations/app/src/main/java/examples/android/com/recyclerviewanimations/MainActivity.java" rel="nofollow">GitHub sample</a>

1) Add Listener inside your onCreateViewHolder() to register for onClick

2) Create your custom OnClickListener inside your Adapter 

<pre><code>private View.OnClickListener mItemListener = new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 TextView tv = (TextView) v.findViewById(R.id.tvItems);
 String selected = tv.getText().toString();
 boolean checked = itemsList.get(recyclerView.getChildAdapterPosition(v)).isChecked();

 switch (selected){
 case "Item1":
 if(checked){
 deleteItem(v);
 itemsList.get(recyclerView.getChildAdapterPosition(v)).setChecked(false);
 }else {
 addItem(v);
 itemsList.get(recyclerView.getChildAdapterPosition(v)).setChecked(true);
 }
 break;
 case "Item2":
 if(checked){
 deleteItem(v);
 itemsList.get(recyclerView.getChildAdapterPosition(v)).setChecked(false);
 }else {
 addItem(v);
 itemsList.get(recyclerView.getChildAdapterPosition(v)).setChecked(true);
 }
 break; 
 default:
 //In my case I have checkList in subItems,
 //checkItem(v);
 break;
 }
 }
};
</code></pre>

3) Add your addItem() and deleteItem() 

<pre><code>private void addItem(View view){
 int position = recyclerView.getChildLayoutPosition(view);
 if (position != RecyclerView.NO_POSITION){
 navDrawItems.add(position+1,new mObject());
 navDrawItems.add(position+2,new mObject());
 notifyItemRangeInserted(position+1,2);
 }
}


private void deleteItem(View view) {
 int position = recyclerView.getChildLayoutPosition(view);
 if (position != RecyclerView.NO_POSITION) {
 navDrawItems.remove(position+2);
 navDrawItems.remove(position+1);
 notifyItemRangeRemoved(position+1,2);
 }
}
</code></pre>

4) If your RecyclerViewAdapter is not in the same Activity as Recycler View, pass instance of recyclerView to the Adapter while creating

5) itemList is a ArrayList of type mObject which helps maintain states of item (Open/Close) , name, type of Item(subItems/mainItem) and set Theme based on values

<pre><code>public class mObject{
 private String label;
 private int type;
 private boolean checked;
} 
</code></pre>

It's possible to use expandable list items with new RecyclerView? Like ExpandableListView?

Expandable list with RecyclerView?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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可以在新的RecyclerView中使用可扩展的列表项吗？就像ExpandableListView一样？

问使用RecyclerView的可扩展列表？
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问使用RecyclerView的可扩展列表？EN