RecycleView 加载ViewHoulder 优化

最新推荐文章于 2025-01-14 09:49:52 发布

MissGentlemen

最新推荐文章于 2025-01-14 09:49:52 发布

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本文链接：https://blog.youkuaiyun.com/MissGentlemen/article/details/78946705

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本文介绍了一个基于Android平台的自定义RecyclerView适配器的实现方法。通过该适配器可以为列表项添加点击事件，并实现如删除和插入等操作。此外，还展示了如何使用不同类型的布局管理器来改变列表项的显示方式。

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MainActivity

package com.lixinyang.myrecyclerview;

import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

import com.lixinyang.myrecyclerview.Adapter.MyAdapter;
import com.lixinyang.myrecyclerview.Bean.User;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private int[] arr = new int[]{
            R.drawable.aaaa,
            R.drawable.abc,
            R.drawable.b,
            R.drawable.c
    };
    private RecyclerView rv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        rv = (RecyclerView) findViewById(R.id.rv);
        ArrayList<User> list = new ArrayList<User>();
        for (int i=0;i<100;i++){
            String name = "李新阳"+i;
            int img = arr[i%arr.length];
            User user = new User(name,img);
            list.add(user);
        }
        //布局管理器控制你应该用什么形式展示出来
        rv.setLayoutManager(new LinearLayoutManager(MainActivity.this));
        //设置动画
        rv.setItemAnimator(new DefaultItemAnimator());
        final MyAdapter adapter = new MyAdapter(MainActivity.this,list);
        rv.setAdapter(adapter);
        adapter.aa(new MyAdapter.MyItemChecked(){

            @Override
            public void itemClick(View view, final int Position) {
                AlertDialog.Builder buider = new AlertDialog.Builder(MainActivity.this);
                buider.setTitle("请选择操作");
                buider.setPositiveButton("删除", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        adapter.removeUser(Position);
                    }
                });
                buider.setNegativeButton("添加", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        User user = new User("哈哈",R.drawable.ic_launcher_background);
                        adapter.addUser(user,Position);
                    }
                });
                buider.show();

            }
        });


    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.item,menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
            switch(item.getItemId()){
                    case R.id.one:
                     rv.setLayoutManager(new LinearLayoutManager(MainActivity.this));
                    break;
                    case R.id.two:
                        rv.setLayoutManager(new GridLayoutManager(MainActivity.this,2));
                    break;
                    case R.id.three:
                        rv.setLayoutManager(new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL));
                    break;
                }
        return super.onOptionsItemSelected(item);
    }
}

Adapter

package com.lixinyang.myrecyclerview.Adapter;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.lixinyang.myrecyclerview.Bean.User;
import com.lixinyang.myrecyclerview.R;

import java.util.ArrayList;

/**
 * author:Created by WangZhiQiang on 2017/12/29.
 */

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
    private Context context;
    private ArrayList<User> list;
    private MyItemChecked myItemChecked;

    //实现构造方法
    public MyAdapter(Context context, ArrayList<User> list) {
        this.context = context;
        this.list = list;
    }
    //创建ViewHolder的时候
    //实例化ViewHolder
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //获取到你的条目布局
        View view = LayoutInflater.from(context).inflate(R.layout.item, null);
        //实例化ViewHolder 将布局传入
        MyViewHolder myViewHolder = new MyViewHolder(view);
        return myViewHolder;
    }
    //当你绑定ViewHolder的时候
    //给控件设置数据
    @Override
    public void onBindViewHolder(final MyViewHolder holder, final int position) {
        holder.getTextView().setText(list.get(position).getString());
        holder.getImageView().setImageResource(list.get(position).getImage());
        if(myItemChecked!=null){
            holder.itemView.setOnClickListener(new View.OnClickListener(){
                @Override
                public void onClick(View view) {
                    			int layoutPosition = holder.getLayoutPosition();
			myItemChecked.itemClick(holder.imageView,layoutPosition);
                }            });        }    }    @Override    public int getItemCount() {        return list.size();    }    public interface MyItemChecked{        void itemClick(View view,int Position);    }    public void aa(MyItemChecked myItemChecked){        this.myItemChecked = myItemChecked;    }    public void addUser(User user,int position){        list.add(position,user);        notifyItemInserted(position);    }    public void removeUser(int position){        list.remove(position);        notifyItemRemoved(position);    }    class MyViewHolder extends RecyclerView.ViewHolder{        private final ImageView imageView;        private final TextView textView;        public MyViewHolder(View itemView) {            super(itemView);            this.imageView = itemView.findViewById(R.id.iv);            this.textView = itemView.findViewById(R.id.tv);        }        public ImageView getImageView() {            return imageView;        }        public TextView getTextView() {            return textView;        }    }}