2.13 GridAdapter

GridAdapter

package com.example.firstapp.recyclerview;

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.firstapp.R;

import java.util.List;

public class GridAdapter extends RecyclerView.Adapter<GridAdapter.LinearViewHolder> {

    private Context mContext;
    private OnItemClickListener mlistener;
    private List<String> list;

    public GridAdapter(Context context, OnItemClickListener listener){
        this.mContext=context;
        this.mlistener=listener;
    }

    @NonNull
    @Override
    public GridAdapter.LinearViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
//这个方法需要return一个ViewHolder
        return new LinearViewHolder( LayoutInflater.from( mContext ).inflate( R.layout.layout_grid_recyclerview_item,parent,false ) );
    }

    @Override
    public void onBindViewHolder(@NonNull GridAdapter.LinearViewHolder holder, final int position) {
//可以通过holder来设置一些内容
        holder.textView.setText( "Hello" );

        holder.itemView.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Toast.makeText( mContext, "click..."+position, Toast.LENGTH_SHORT ).show();
            mlistener.onclick( position );
            }
        } );//设置点击事件，但是我这个上面没有显示
    }

    @Override
    //列表长度
    public int getItemCount() {
        return 300;
    }

    class LinearViewHolder extends RecyclerView.ViewHolder{

        private TextView textView;


        public LinearViewHolder(View itemView){
            super(itemView);
            textView=itemView.findViewById( R.id.tv_title );
        }
    }
    //写一个接口用来接收点击事件的值
    public interface OnItemClickListener{
        void onclick(int pos);
    }
}