首先這并不是多級列表實現(xiàn)的最優(yōu)方式脓钾，多級列表從表現(xiàn)形式上來看無非就是數(shù)據(jù)+縮進(或者顏色，字體大小等)竞帽，通過讀個RecycleView且套可以實現(xiàn)但是如果列表層級過多則會比較累贅，前面說到的縮進等表現(xiàn)形式完全可以在一個RecycleView中來實現(xiàn)具體可以參考以下鏈接
[1]: http://www.reibang.com/p/b76572fb4e60

布局文件

主界面布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="rar.uchannel.com.recyclelviewandrecycleview.MainActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycleView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</android.support.constraint.ConstraintLayout>

主RecycleView的Item的布局

<?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="wrap_content"
  android:orientation="vertical">

  <TextView
      android:id="@+id/tv"
      android:layout_width="match_parent"
      android:layout_height="30dp"
      android:background="@color/colorPrimary"
      android:gravity="center" />

  <LinearLayout
      android:id="@+id/ll"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content">

      <android.support.v7.widget.RecyclerView
          android:id="@+id/recycleView_son"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content" />
  </LinearLayout>

</LinearLayout>

子RecycleView的Item的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/ll_other"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_other"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

這玩意就不多說了,主要講嵌套中會出現(xiàn)的問題

主RecycleView的適配器

 public class CustomAdapter extends RecyclerView.Adapter<CustomViewHolder> {
     private Context context;
     private List<String> data;

     CustomAdapter(Context context, List<String> data) {
         this.context = context;
         this.data = data;
     }

     @Override
     public CustomViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
         return new CustomViewHolder(LayoutInflater.from(context).inflate(R.layout.item_for_recycleview, parent, false));
     }


     @Override
     public void onBindViewHolder(final CustomViewHolder holder, final int position) {
         holder.textView.setText(data.get(position));
         if (onItemClickListener != null) {
             holder.textView.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View view) {
                     Log.e("xxx", holder.isRecyclable() + "");
                     int pos = holder.getLayoutPosition();
                     onItemClickListener.onItemClick(holder, pos);
                     holder.setIsRecyclable(false);//view復(fù)用造成一處點擊多處響應(yīng)的問題 設(shè)置為被點擊的item不可以被復(fù)用，
                     Log.e("xxx", holder.isRecyclable() + "");
                 }
             });
         }
     }

     @Override
     public int getItemCount() {
         return data.size();
     }

     void setOnItemClickListener(OnItemClickListener itemClickListener) {
         this.onItemClickListener = itemClickListener;
     }

     private OnItemClickListener onItemClickListener;

     interface OnItemClickListener {
         void onItemClick(CustomViewHolder holder, int position);
     }
 }

問題1：點擊RecycleView中的某個Item會出現(xiàn)多個Item響應(yīng)的問題歹袁，可能有規(guī)律。
解決：RecycleView中的點擊事件不要直接在Adapter中實現(xiàn)寝优，通過回調(diào)傳入在外部實現(xiàn)条舔，回調(diào)接口中參數(shù)為ViewHolder是應(yīng)為某些情況下點擊事件有一個控件響應(yīng)之后去修改其他控件的內(nèi)容》Ψ可以修改為對應(yīng)View

問題2：點擊一個RecycleView中的Item展開其次級列表時后面的Item也會復(fù)用當前已經(jīng)展開的Item(這個跟上面有點類似)
解決： 這里解決方案比較多設(shè)置Tag之類的都是可行的孟抗，究其原理無非是展開的Item不進行復(fù)用迁杨，這里采用的方式是直接設(shè)置Item不可復(fù)用holder.setIsRecyclable(false);這里僅僅對單個已經(jīng)點擊的item有效，而且當該item畫出屏幕外再次滑動回到屏幕內(nèi)時其復(fù)用狀態(tài)會重新更新為可以復(fù)用凄硼，可以看到代碼中的兩個Log铅协，當Item出現(xiàn)在屏幕內(nèi)首次點擊之前該Item都是可以復(fù)用的，對性能影響較小摊沉。

這里滑動沖突不需要進行處理警医，應(yīng)為RecycleView布局使用的是android:layout_height="wrap_content"如果各位在且套的時候要求內(nèi)部子RecycleView長度固定且可以滑動就需要通過setScrollEnabled處理滑動沖突，(額坯钦，直說吧這里我根本沒嘗試...)

MainActivity代碼

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }

    List<String> getData() {
        ArrayList<String> strings = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            strings.add("i=" + i);
        }
        return strings;
    }

    List<String> getData2Inner() {
        ArrayList<String> strings = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            strings.add("i=" + i);
        }
        return strings;
    }

    void initView() {
        RecyclerView recyclerView = findViewById(R.id.recycleView);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        final CustomAdapter adapter = new CustomAdapter(this, getData());
        adapter.setOnItemClickListener(new CustomAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(CustomViewHolder holder, int position) {
                LinearLayoutManager llm = new LinearLayoutManager(MainActivity.this);
                llm.setOrientation(LinearLayoutManager.VERTICAL);
                InnerAdapter innerAdapter = new InnerAdapter(MainActivity.this, getData2Inner());
                holder.recyclerView.setLayoutManager(llm);
                holder.recyclerView.setAdapter(innerAdapter);
                ViewGroup.LayoutParams layoutParams = holder.linearLayout.getLayoutParams();
                layoutParams.height = 0;
                holder.linearLayout.setLayoutParams(layoutParams);
                startAnimation(holder.linearLayout);
            }
        });
        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(linearLayoutManager);
    }


    public void startAnimation(final View view) {
        ValueAnimator animator;
        if (view.getHeight() == 0) {
            animator = ValueAnimator.ofInt(0, getMeasureHeight(view));
            animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator animation) {
                    ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
                    layoutParams.height = (int) animation.getAnimatedValue();
                    view.setLayoutParams(layoutParams);
                }
            });

        } else {//if (view.getHeight() == getMeasureHeight(view))
            animator = ValueAnimator.ofInt(view.getHeight(), 0);
            animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator animation) {
                    ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
                    layoutParams.height = (int) animation.getAnimatedValue();
                    view.setLayoutParams(layoutParams);
                }
            });
        }
        animator.setDuration(1000);
        animator.start();
    }

    /**
     * 測量控件的顯示的時候的真實高度
     *
     * @param view target view
     * @return target view real height
     */
    public int getMeasureHeight(View view) {
        int w = View.MeasureSpec.makeMeasureSpec(0,
                View.MeasureSpec.UNSPECIFIED);
        int h = View.MeasureSpec.makeMeasureSpec(0,
                View.MeasureSpec.UNSPECIFIED);
        view.measure(w, h);
        return view.getMeasuredHeight();
    }
}

其他ViewHolder和子Adapter就不貼了预皇，沒有什么需要注意的地方改怎么寫就怎么寫