Android RecyclerView使用(包含Onlick Listener)

首先在build.gradle(Module:app)裡面引進recyclerview的library

compile 'com.android.support:recyclerview-v7:27.0.1'

接著在你要的layout裡面加入元件:

<android.support.v7.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>

創一個view裡面的單一row的layout，通常可以配合cardview使用會有比較好的點擊效果:

<android.support.v7.widget.CardView
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="8dp"
    android:id="@+id/cv_item"
    android:foreground="?android:attr/selectableItemBackground"
    card_view:cardCornerRadius="4dp"
    card_view:cardBackgroundColor="#ffffff"
    card_view:cardElevation="4dp"
    >
    <TextView
        android:id="@+id/tName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="姓名"
        />

</android.support.v7.widget.CardView>

創建一個class(通常可以叫RecyclerAdapter)

public class RecyclerAdapter_UserList extends RecyclerView.Adapter<RecyclerAdapter_UserList.RecyclerHolder>  {
    private ArrayList<String> name;

    private OnItemClickListener mOnItemClickListener;

    public RecyclerAdapter_UserList(ArrayList<String> name){
        this.name = name;
    }


    public interface OnItemClickListener
    {
        void onItemClick(View view, int position);
        void onItemLongClick(View view, int position);
    }

    public void setOnItemClickListener(OnItemClickListener mOnItemClickListener)
    {
        this.mOnItemClickListener = mOnItemClickListener;
    }

    public static class RecyclerHolder extends RecyclerView.ViewHolder {
        //這裡要bind元件到你綁的view上面
        TextView textViewName;
        public RecyclerHolder(View itemView) {
            super(itemView);
            textViewName = itemView.findViewById(R.id.tName);


        }
    }

    @Override
    public RecyclerHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_user_list, parent, false);
        return new RecyclerHolder(view);
    }

    @Override
    public void onBindViewHolder(final RecyclerHolder holder, int position) {
        //這邊把你要的資料bind在元件上面，onclicklistener也是在這裡加入
        holder.textViewName.setText(name.get(position));
        if (mOnItemClickListener != null){
            //set短和長按事件
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    int pos = holder.getLayoutPosition();
                    mOnItemClickListener.onItemClick(holder.itemView, pos);
                }
            });
            holder.itemView.setOnLongClickListener(new View.OnLongClickListener()
            {
                @Override public boolean onLongClick(View v)
                {
                    int pos = holder.getLayoutPosition();
                    mOnItemClickListener.onItemLongClick(holder.itemView, pos);
                    return false;
                }
            });
        }
    }

    @Override
    public int getItemCount() {
        if (name == null)
            return 0;
        else
            return name.size();
    }


}

最後在主要activity或是fragment加入以下:

RecyclerView recyclerView = v.findViewById(R.id.recycler_userlist);
RecyclerView.LayoutManager  layoutManager = new LinearLayoutManager(context);
recyclerView.setLayoutManager(layoutManager);

recyclerView.setHasFixedSize(true);
recyclerView.setItemAnimator(new DefaultItemAnimator());

adapter_userList = new RecyclerAdapter_UserList(names);
recyclerView.setAdapter(adapter_userList);

當資料有變動要即時更新時:

adapter_userList.notifyDataSetChanged();

這邊要特別注意一點就是只有在你使用的還是相同的adapter還有相同的data set才可以直接call這個method，任何有新的物件都要重新constructor 或者setadapter