b站材料2--Adapter源文件

講解recyclerview時需要的adapter

package com.example.eva.CourseAdapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.example.eva.R;

public class LinearCourseFinishAdapter extends RecyclerView.Adapter <RecyclerView.ViewHolder>{
    @NonNull
    private Context mContext;
    private OnItemClickListener mListener;
    //private List<String> list;

    public LinearCourseFinishAdapter(Context context , OnItemClickListener listener){
        this.mContext = context;
        this.mListener = listener;
    }

    @Override
    public  RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        //viewType可以通過這個，展示不同的item
        return new LinearViewHolder(LayoutInflater.from(mContext).inflate(R.layout.course_finish_item, parent, false));
        //這裏需要傳入每個item長什麼樣的佈局，需要去layout中去畫我們的佈局
        }

    @Override
    //通過getItemViewType的返回值來選擇具體的item顯示
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, final int position) {
            ((LinearViewHolder)holder).textView.setText("四級詞彙");
            //如果是直接用viewholder的話，是不能用test view的
        //將點擊事件放到外面
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Toast.makeText(mContext,"click..."+position,Toast.LENGTH_SHORT).show();
                mListener.onClick(position);
            }
        });
    }

    //去控制viewType的方法，根據位置的奇偶性來區分
    @Override
    public int getItemViewType(int position) {
        if(position % 2 == 0){
            return 0;//偶數
        }else{
            return 1;
        }
    }

    @Override
    public int getItemCount() {
        return 1;
    }

    class LinearViewHolder extends RecyclerView.ViewHolder{
        private TextView textView;

        public LinearViewHolder(View itemView){
            super(itemView);
            textView = itemView.findViewById(R.id.finish_title);
        }
    }


    //接口
    public interface  OnItemClickListener{
        void onClick(int pos);
    }
}