前言

一、繼承RecyclerView.Adapter實作adapter

1.首先自定義一個item

<?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:layout_marginTop="10dp"
    android:background="#A4D3EE">
    <ImageView
        android:id="@+id/iv"
        android:layout_width="88dp"
        android:layout_height="88dp"
        android:scaleType="fitXY"/>
    <TextView
        android:id="@+id/tv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="你好"
        android:textSize="22sp"
        android:gravity="center_vertical"
        />
</LinearLayout>

注意：此處的LinerLayout的layout_height要注意不要寫成match_parent，不然就會出現一個item占一整個頁面的尷尬情況，

2.在自定義MyAdapter中實作內部類MyViewHolder

    class MyViewHolder extends RecyclerView.ViewHolder{
        ImageView mIv;
        TextView mTv;
        public MyViewHolder(View itemView) {
            super(itemView);

            mIv=itemView.findViewById(R.id.iv);
            mTv=itemView.findViewById(R.id.tv);
        }
    }

說明：這里進行了item中的控制元件系結，

3.繼承RecyclerView.Adapter

    private List<String> dataSource;
    private Context mContext;
    private RecyclerView mRv;
    public MyReyclerViewAdapter(Context context,RecyclerView recyclerView){
        mContext=context;
        dataSource=new ArrayList<>();
        mRv=recyclerView;
    }
    /**
     * 創建實體
     */
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater= LayoutInflater.from(mContext);
        View view=inflater.inflate(R.layout.item_layout,parent,false);
        MyViewHolder myViewHolder=new MyViewHolder(view);
        return myViewHolder;
    }

    @Override
    public void onBindViewHolder(MyReyclerViewAdapter.MyViewHolder holder, int position) {
        holder.mIv.setImageResource(getIcon(position));
        holder.mTv.setText(dataSource.get(position));
    }

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

4.我們還需要有一個更新資料的方法

 public void setDataSource(List<String> dataSource) {
        this.dataSource = dataSource;
        notifyDataSetChanged();
    }

說明：notifyDataSetChanged()方法可以重繪adapter

5.在MainActivity中設定ReyclerView

 //線性布局
        LinearLayoutManager linearLayoutManager=new LinearLayoutManager(this);
        //橫向排列ItemView
        //linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
        //資料反向展示
        linearLayoutManager.setReverseLayout(true);
        mRecyclerView.setLayoutManager(linearLayoutManager);
        mReyclerViewAdapter=new MyReyclerViewAdapter(this,mRecyclerView);
        
        mRecyclerView.setAdapter(mReyclerViewAdapter);

二、點擊事件的設定

1.方法一(介面方法)

在adpter中

	private OnItemClickListener mItemClickListener;
    public void setOnclickItem(OnclickItem onclickItem) {
        this.onclickItem = onclickItem;
    }

    public interface OnclickItem{
        public void onItemClick(int position);
    }
    @Override
    public void onBindViewHolder(@NonNull @NotNull LinerAdaper.LinerViewHolder holder, int position) {
        if(onclickItem!=null){
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    onclickItem.onItemClick(position);
                }
            });
        }
    }

在實體化ReyclerView activity中設定

        mAdapter.setOnclickItem(new LinerAdaper.OnclickItem() {
            @Override
            public void onItemClick(int position) {
                Toast.makeText(MainActivity.this,"我是"+position,Toast.LENGTH_SHORT).show();
            }
        });

2.方法二

在實體化ReyclerView activity中設定addOnItemTouchListener

        mRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
            @Override
            public boolean onInterceptTouchEvent(@NonNull @NotNull RecyclerView rv, @NonNull @NotNull MotionEvent e) {
                return false;
            }

            @Override
            public void onTouchEvent(@NonNull @NotNull RecyclerView rv, @NonNull @NotNull MotionEvent e) {

            }

            @Override
            public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

            }
        });