<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 xmlns:tools="http://schemas.android.com/tools"
 android:orientation="vertical">
<RelativeLayout
  android:id="@+id/rl_parent"
  android:layout_width="match_parent"
  android:layout_height="50dp"
  android:background="#00574B">

  <TextView
   android:id="@+id/textViewparent"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:textSize="30dp"
   android:layout_centerInParent="true"
   android:textColor="@android:color/white"
   tools:text="主布局" />
 </RelativeLayout>

 <RelativeLayout
  android:id="@+id/rl_child"
  android:layout_width="match_parent"
  android:layout_height="100dp"
  android:background="#ffffff"
  android:visibility="gone">

  <ImageView
   android:id="@+id/imageview"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content" />

  <TextView
   android:id="@+id/textViewchild"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_centerInParent="true"
   android:textSize="25dp"
   android:textColor="#000000"
   tools:text="副部局" />
 </RelativeLayout>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">
 <include layout="@layout/top" />
 <FrameLayout
  android:id="@+id/id_content"
  android:layout_width="match_parent"
  android:layout_height="0dp"
  android:layout_weight="1">
  <android.support.v7.widget.RecyclerView
   android:id="@+id/recyclerView"
   android:layout_width="match_parent"
   android:layout_height="match_parent">
  </android.support.v7.widget.RecyclerView>
 </FrameLayout>
 <include layout="@layout/bottom" />
</LinearLayout>

public class adapter extends RecyclerView.Adapter <adapter.myviewholder>{
 private List<String> mlist=new ArrayList<>();
 private Context context;
 private View inflater;
 private static final String tag=adapter.class.getSimpleName();
 private int expandedPosition=1;
 private myviewholder mViewHolder;
 public adapter(Context context) {//,List<String> list
  this.context=context;
 }
 public void setExpandCollapseDataList(List<String> list){
  mlist=list;
  notifyDataSetChanged();
 }
 @Override
 public adapter.myviewholder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
  inflater= LayoutInflater.from(context).inflate(R.layout.tab01,viewGroup,false);
  myviewholder myviewholder=new myviewholder(inflater);
  return myviewholder;
 }
 @Override
 public void onBindViewHolder(final adapter.myviewholder myviewholder, final int j) {
  myviewholder.textviewparent.setText(mlist.get(j));
  myviewholder.imageview.setImageResource(R.drawable.p1);
  myviewholder.textviewchild.setText(mlist.get(j+15));
  final boolean isExpanded=j==expandedPosition;
  myviewholder.rlChild.setVisibility(isExpanded ? View.VISIBLE : View.GONE);
  myviewholder.rlParent.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    if (mViewHolder != null) {
     mViewHolder.rlChild.setVisibility(View.GONE);
     notifyItemChanged(expandedPosition);
    }
    expandedPosition = isExpanded ? -1 : myviewholder.getAdapterPosition();
    mViewHolder = isExpanded ? null : myviewholder;
    notifyItemChanged(myviewholder.getAdapterPosition());
   }
  });
 }
 @Override
 public int getItemCount() {
  return mlist == null ? 0 : mlist.size()/2;
 }
 class myviewholder extends RecyclerView.ViewHolder{
  private ImageView imageview;
  RelativeLayout rlParent, rlChild;
  TextView textviewparent, textviewchild;
  public myviewholder(View itemView) {
   super(itemView);
   rlParent = itemView.findViewById(R.id.rl_parent);
   rlChild = itemView.findViewById(R.id.rl_child);
   textviewparent = itemView.findViewById(R.id.textViewparent);
   textviewchild = itemView.findViewById(R.id.textViewchild);
   imageview=itemView.findViewById(R.id.imageview);
  }
 }
}

private void initmyData() {
 list.add("路德維?！し病へ惗喾?);
 list.add("蕭友梅");
 list.add("阿炳");
 list.add("冼星海");
 list.add("聶耳");
 list.add("施光南");
 list.add("弗里德里克·肖邦");
 list.add("羅伯特·舒曼");
 list.add("莫扎特");
 list.add("約瑟夫·海頓");
 list.add("舒伯特");
 list.add("巴赫");
 list.add("弗侖茲·李斯特");
 list.add("約翰奈斯·勃拉姆斯");
 list.add("門德?tīng)査?);
 list.add("德國(guó)作曲家、鋼琴家、指揮家，被稱為樂(lè)圣。");
 list.add("中國(guó)專業(yè)音樂(lè)教育的奠基人和開(kāi)拓者、音樂(lè)理論家、作曲家。");
 list.add("民間音樂(lè)家、二胡演奏家，譽(yù)為演奏能手。");
 list.add("中國(guó)近代作曲家、鋼琴家--人民音樂(lè)家。");
 list.add("中國(guó)音樂(lè)家--時(shí)代歌手。");
 list.add("譽(yù)為時(shí)代歌手，現(xiàn)代抒情歌曲作曲家。");
 list.add("譽(yù)為鋼琴詩(shī)人，波蘭作曲家、鋼琴家。");
 list.add("德國(guó)著名作曲家、音樂(lè)評(píng)論家。");
 list.add("奧地利作曲家，被譽(yù)為神童。");
 list.add("奧地利作曲家，維也納古典派奠基者之一。");
 list.add("奧地利作曲家--前所未有的最富詩(shī)意的音樂(lè)家。");
 list.add("德國(guó)最偉大的古典作曲家之一，管風(fēng)琴演奏家。");
 list.add("天才的匈牙利作曲家、鋼琴家、指揮家和音樂(lè)活動(dòng)家。");
 list.add("德國(guó)十九世紀(jì)后半葉最卓越的、古典樂(lè)派最后的一位作曲家。");
 list.add("德國(guó)著名作曲家。");
}

private void initView1() {
 adapter adapter = new adapter(this);
 RecyclerView recyclerView = findViewById(R.id.recyclerView);
 recyclerView.setLayoutManager(new LinearLayoutManager(this));
 recyclerView.setHasFixedSize(true);
 recyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
 recyclerView.setAdapter(adapter);
 adapter.setExpandCollapseDataList(list);
}