自定义RecyclerView之多条目加载

最新推荐文章于 2024-08-25 13:34:39 发布

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最新推荐文章于 2024-08-25 13:34:39 发布

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本文介绍了一个使用 Android RecyclerView 控件实现网格和列表布局切换的例子。通过一个简单的应用程序展示了如何配置 RecyclerView 来显示不同类型的列表项，并实现了刷新功能。

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主类 Activity:

package chenchneg20171009.bwie.com.lianxi10day13_1;

import android.os.Bundle;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    RecyclerView rv;
    List<ItemBrean> list = new ArrayList<ItemBrean>();
    MyAdapter myAdapter;
    /**
     * 网格
     */
    private Button mBt;
    private SwipeRefreshLayout mSrl;

    /**
     * 网格
     */


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();

        //初始化数据
        rv = (RecyclerView) findViewById(R.id.rv);
        show(true);
    }


    private void initView() {
        mBt = (Button) findViewById(R.id.bt);
        mBt.setOnClickListener(this);
        mSrl = (SwipeRefreshLayout) findViewById(R.id.srl);
        mSrl.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
             Toast.makeText(MainActivity.this,"OnRefreshListener", Toast.LENGTH_SHORT).show();
            //网络请求数据,然后更新列表
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(MainActivity.this,"数据请求成功", Toast.LENGTH_SHORT).show();
                        List<ItemBrean> l=new ArrayList<ItemBrean>();
                        for (int i=0;i<10;i++){
                            ItemBrean itemBrean = new ItemBrean("名字" + i, "年龄" + i);
                          l.add(itemBrean);
                        }
                       myAdapter.refresh(l);
                        //关闭刷新
                        mSrl.setRefreshing(false);
                    }
                },3000);
            }
        });
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.bt:
                String str = mBt.getText().toString().trim();
                if ("网格".equals(str)) {
                    show(false);
                    mBt.setText("垂直");
                } else {
                    show(true);
                    mBt.setText("网格");
                }
                break;
        }
    }

    private void show(boolean flag) {
        //设置布局管理器
        //垂直列表
        // rv.setLayoutManager(new LinearLayoutManager(this));
        //网格模式
        // rv.setLayoutManager(new GridLayoutManager(this, 2));
        //添加垂直分割线
        rv.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
        //水平分割线
        RecyclerView.LayoutManager layoutManager = null;
        if (flag) {
            layoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        } else {
            layoutManager = new GridLayoutManager(this, 2);
        }
        rv.setLayoutManager(layoutManager);
        rv.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.HORIZONTAL));
        //横向列表false是从左往右，ture是从右往左
        // rv.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false));
        for (int i = 0; i < 100; i++) {
            ItemBrean itemBrean = new ItemBrean("name" + i, "age" + i);
            list.add(itemBrean);

        }
        //创建适配器
        myAdapter = new MyAdapter(this, list);
        rv.setAdapter(myAdapter);
        myAdapter.setonItemClick(new MyAdapter.OnItemListener() {
            @Override
            public void onItemClick(int psotion) {
                Toast.makeText(MainActivity.this, "点击" + psotion, Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onItemlongClick(int postion) {
                Toast.makeText(MainActivity.this, "长点击" + postion, Toast.LENGTH_SHORT).show();
            }
        });
    }
    public void refresh(){

    }

}

适配器 Adapter:

package chenchneg20171009.bwie.com.lianxi10day13_1;

        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.LinearLayout;
        import android.widget.TextView;

        import java.util.List;

/**
 * Created by dell on 2017/10/13.
 */

public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private Context context;
    private List<ItemBrean> list;
    private OnItemListener onItemListener;
private static int TYPE1=0;
    private static int TYPE2=1;


    //接口回调
    public interface OnItemListener{
        public void  onItemClick(int psotion);
        public void onItemlongClick(int postion);
    }
    public void setonItemClick(OnItemListener onItemListener){
        this.onItemListener=onItemListener;
    }
    public MyAdapter(Context context, List<ItemBrean> list){
        this.context=context;
        this.list=list;
    }
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
       RecyclerView.ViewHolder viewHolder=null;
        if(viewType==TYPE1){
            View view= LayoutInflater.from(context).inflate(R.layout.item1,parent,false);
            viewHolder = new Type1ViewHolder(view);
        }else{
          View view= LayoutInflater.from(context).inflate(R.layout.item2,parent,false);
           viewHolder = new Type2ViewHolder(view);
        }


        return viewHolder;
    }
   //多条目加载判断方法
    @Override
    public int getItemViewType(int position) {

        return position%2==0?TYPE1:TYPE2;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
        if (holder instanceof Type1ViewHolder) {
        ItemBrean itemBrean = list.get(position);
        //强转
        Type1ViewHolder type = (Type1ViewHolder) holder;
        type.tvname.setText(itemBrean.getName());
        type.tvage.setText(itemBrean.getAge());
        //条目监听
        type.ll.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (onItemListener != null) {
                    onItemListener.onItemClick(position);
                }
            }
        });
        type.ll.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                if (onItemListener != null) {
                    onItemListener.onItemlongClick(position);
                }
                return true;
            }
        });
    }else{
            Type2ViewHolder type2 = (Type2ViewHolder) holder;
        }
    }

    @Override
    public int getItemCount() {
        return list.size();
    }
    private  class Type1ViewHolder extends RecyclerView.ViewHolder{
        TextView tvname;
        TextView tvage;
        LinearLayout ll;
        public Type1ViewHolder(View itemView) {
            super(itemView);
            tvname = itemView.findViewById(R.id.tv_name);
            tvage = itemView.findViewById(R.id.tv_age);
            ll = itemView.findViewById(R.id.ll);
        }
    }
    //展示页面数据

    public void refresh(List<ItemBrean> l) {
        list.clear();
        list.addAll(l);
        notifyDataSetChanged();
    }
    private class Type2ViewHolder extends RecyclerView.ViewHolder{

        public Type2ViewHolder(View itemView) {
            super(itemView);
        }
    }
}

新添加 XML:

<?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="45dp">
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@mipmap/ic_launcher"/>
</LinearLayout>