新增依賴，如上文

public class RecycleAdapter extends RecyclerView.Adapter<RecycleAdapter.MyHolder> {
private Context context;
private ArrayList<String> list;
private List<Integer> random_nums;//放隨機數
private OnRecyclerItemClickListener mOnItemClickListener;//單擊事件
private onRecyclerItemLongClickListener mOnItemLongClickListener;//長按事件


public RecycleAdapter(Context context, ArrayList<String> list) {
    this.context = context;
    this.list = list;
    //記錄為每個控制元件產生的隨機高度，避免滑到頂部出現空白
    random_nums=new ArrayList<>();
    for (int i = 0; i < list.size(); i++) {
        int random=new Random().nextInt(200)+100;
        random_nums.add(random);
    }
}

@NonNull
@Override
public MyHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    View view=LayoutInflater.from(context).inflate(R.layout.recycle_item,viewGroup,false);
    return new MyHolder(view);
}

@Override
public void onBindViewHolder(@NonNull final MyHolder myHolder, int i) {
    //填充資料
    myHolder.textView.setText(list.get(i));
    //由於需要實現瀑布流的效果，所以需要動態的改變控制元件的高度
    ViewGroup.LayoutParams params=myHolder.textView.getLayoutParams();
    params.height=random_nums.get(i);
    myHolder.textView.setLayoutParams(params);
    //設定點選事件
    if (mOnItemClickListener!=null){
        myHolder.textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //這裡是為textView設定了單擊事件,回調出去
                //mOnItemClickListener.onItemClick(v,position);這裡需要獲取佈局中的position,不然亂序
                mOnItemClickListener.onItemClick(v,myHolder.getLayoutPosition());
            }
        });
    }
    if(mOnItemLongClickListener != null){
        myHolder.textView.setOnLongClickListener(new View.OnLongClickListener() {
            /**
             * @param v
             * @return
             */
            @Override
            public boolean onLongClick(View v) {
                //回調出去
                mOnItemLongClickListener.onItemLongClick(v,myHolder.getLayoutPosition());
                return true;//不返回true,鬆手還會去執行單擊事件
            }
        });
    }
}

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

class MyHolder extends RecyclerView.ViewHolder{
    TextView textView;
   public MyHolder(@NonNull View itemView) {
       super(itemView);
       textView=itemView.findViewById(R.id.text);
   }
 }

/**
 * 處理item的點選事件，自定義介面回撥
 */
interface OnRecyclerItemClickListener {
    public void onItemClick(View view, int position);
}

/**
 * 長按事件
 */
interface  onRecyclerItemLongClickListener{
    public void onItemLongClick(View view, int position);
}

public void setOnItemClickListener(OnRecyclerItemClickListener onItemClickListener){
    mOnItemClickListener = onItemClickListener;
}

public void setmOnItemLongClickListener(onRecyclerItemLongClickListener onItemLongClickListener){
       mOnItemLongClickListener=onItemLongClickListener;
   }
   //向指定位置新增元素
    public void addItem(int position,String value){
        if (position>list.size()){
            position=list.size();
        }
    if (position<0){
        position=0;
    }
    /**
     * 使用notifyItemInserted/notifyItemRemoved會有動畫效果
     * 而使用notifyDataSetChanged()則沒有
     */
    list.add(position,value);//在集合中新增這條資料
    random_nums.add(position,new Random().nextInt(200)+100);//新增一個隨機高度，會在onBindViewHolder方法中得到設定
    notifyItemInserted(position);//通知插入了資料元素
 }
//移除指定位置元素
public String removeItem(int position){
    if (position>list.size()-1){
        return null;
    }
    random_nums.remove(position);//刪除新增的高度
    String value=list.remove(position);//在手動集合中刪除一次
    notifyItemRemoved(position);//通知刪除了資料，但是沒有刪除list集合中的資料
    return value;
   }
}


public class MainActivity extends AppCompatActivity {

private RecyclerView recyclerView;
private ArrayList<String> mlist;
private RecycleAdapter recycleAdapter;

/**
 * @param savedInstanceState
 */
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    recyclerView=findViewById(R.id.recycleView);
    //宣告為瀑布流的佈局方式
    StaggeredGridLayoutManager staggeredGridLayoutManager=new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL);
    //為recycleview設定佈局管理器
    recyclerView.setLayoutManager(staggeredGridLayoutManager);
    //初始化資料
    initData();
    //初始化介面卡
    recycleAdapter=new RecycleAdapter(this,mlist);
    recyclerView.setItemAnimator(new DefaultItemAnimator());
    //設定介面卡
    recyclerView.setAdapter(recycleAdapter);
    //自定義分割線並新增
    DividerItemDecoration decoration=new DividerItemDecoration(this,DividerItemDecoration.VERTICAL);
    decoration.setDrawable(ContextCompat.getDrawable(this,R.drawable.divied));
    recyclerView.addItemDecoration(decoration);
    DividerItemDecoration decoration1=new DividerItemDecoration(this,DividerItemDecoration.HORIZONTAL);
    decoration1.setDrawable(ContextCompat.getDrawable(this,R.drawable.divied));
    recyclerView.addItemDecoration(decoration1);
    //重新整理介面卡
    recycleAdapter.notifyDataSetChanged();
    //新增點選事件
    recycleAdapter.setOnItemClickListener(new RecycleAdapter.OnRecyclerItemClickListener() {
        /**
         * @param view
         * @param position
         */
        @Override
        public void onItemClick(View view, int position) {
            Toast.makeText(MainActivity.this,"單擊了:"+mlist.get(position),Toast.LENGTH_SHORT).show();
            recycleAdapter.addItem(position,"新增內容");
            Log.i("tag","onItemClick:"+position);
            Log.i("tag","集合:"+mlist.toString());
        }
    });
    //設定長按事件
    recycleAdapter.setmOnItemLongClickListener(new RecycleAdapter.onRecyclerItemLongClickListener() {
        /**
         * @param view
         * @param position
         */
        @Override
        public void onItemLongClick(View view, int position) {
            Toast.makeText(MainActivity.this,"長按了:"+mlist.get(position),Toast.LENGTH_SHORT).show();
            recycleAdapter.removeItem(position);
            Log.i("tag", "onItemLongClick: "+position);
            Log.i("tag", "集合: "+mlist.toString());
        }
    });
}
//初始化資料
private void initData() {
    mlist=new ArrayList<>();
    for (int i = 'A'; i <='Z' ; i++) {
        mlist.add((char)i+"");
    }
}
}