RecyclerView使用总结

Posted 2020-07-26 春风自是人间客

遇到的异常：

　　java.lang.ExceptionInInitializerError静态块初始化异常

　　NetworkOnMainThreadException访问网线不能在主线程中进行

 

我的参考资料：

　　http://www.oschina.net/question/1764894_246656?fromerr=ZElwOffs
　　老师给的源代码

 

recyclerView 和cartView的导入方法

　　别人的都是：
　　　　compile ‘com.android.support:recyclerview-v7:23.4.0‘
　　　　compile ‘com.android.support:cardview-v7:23.4.0‘

　　但是我的自动添加是这样的：
　　　　compile ‘com.android.support:recyclerview-v7:24.0.0 -beat‘
　　　　compile ‘com.android.support:cardview-v7:24.0.0 -beat‘
　　　　但是就算这样也是不成功的

　　我的只能这样写：
　　　　compile ‘com.android.support:recyclerview-v7:21.+‘
　　　　compile ‘com.android.support:cardview-v7:21.+‘

 

 RecyclerView的使用

　　1页面布局

1     <android.support.v7.widget.RecyclerView
2         android:id="@+id/rcView"
3         android:layout_width="match_parent"
4         android:layout_height="match_parent"
5         />

　　2初始化控件

RecyclerView rcView;
 rcView = (RecyclerView) this.findViewById(R.id.rcView);

　　3给它数据（图片、文字等等）

    List<Integer> imageUrls;
    Integer[] imgs ={
            R.drawable.happy1,R.drawable.happy2,R.drawable.happy3,R.drawable.happy4,
            R.drawable.happy5,R.drawable.happy6,R.drawable.happy7,R.drawable.happy8
    };
        imageUrls = new ArrayList<>();
        imageUrls.addAll(Arrays.asList(imgs));

　　4适配器

public class MyApdater extends RecyclerView.Adapter<MyApdater.MyViewHolder> {

    private Context context;
    private LayoutInflater inflater;
    private List<Integer> imageList;
    private OnItemClickListener itemClickListener;
    public interface OnItemClickListener{
        void onItemClick(View view, int position);
    }


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


    public MyApdater(Context context, List<Integer> imageList) {
        this.context = context;
        this.imageList = imageList;
        inflater = LayoutInflater.from(context);
        setHasStableIds(true);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return new MyViewHolder(inflater.inflate(R.layout.list_item,parent,false));
    }

    @Override
    public int getItemCount() {
        return imageList.size();
    }

    @Override
    public void onBindViewHolder(final MyViewHolder holder, final int position) {
        int e = imageList.get(position);
        holder.img_item.setImageResource(e);
//        x.image().bind(holder.img_item,imageList.get(position),options);
        /*if(itemClickListener != null){
            holder.img_item.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

//                    int pos = holder.getPosition();  //获取当前Item的postion
                    itemClickListener.onItemClick(holder.img_item,position);
                }
            });
        }*/
    }




    class MyViewHolder extends RecyclerView.ViewHolder{
        private ImageView img_item;
        public MyViewHolder(View itemView) {
            super(itemView);
            img_item = (ImageView) itemView.findViewById(R.id.img_item);
        }
    }
}

　　5素材xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:id="@+id/card_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_margin="10dp"
    android:orientation="horizontal"
    card_view:cardBackgroundColor="#EEEEEE"
    card_view:cardCornerRadius="5dp">

    <ImageView
        android:src="@drawable/happy1"
        android:id="@+id/img_item"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

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

　　6在MainActivity中使用适配器

    MyApdater myApdater;
        myApdater = new MyApdater(this,imageUrls);
        rcView.setAdapter(myApdater);

　　7设置RecyclerView的动画、显示等效果

        StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(1,StaggeredGridLayoutManager.VERTICAL);
        rcView.setItemAnimator(new DefaultItemAnimator());
        //rcView.addItemDecoration();
        rcView.setLayoutManager(layoutManager);

　

附：MainActivity全代码

package com.firefly.recyclerview;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

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

public class MainActivity extends ActionBarActivity {
    RecyclerView rcView;
    MyApdater myApdater;
    List<Integer> imageUrls;
    Integer[] imgs ={
            R.drawable.happy1,R.drawable.happy2,R.drawable.happy3,R.drawable.happy4,
            R.drawable.happy5,R.drawable.happy6,R.drawable.happy7,R.drawable.happy8
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initData();
        init();
    }

    private void init() {

        rcView = (RecyclerView) this.findViewById(R.id.rcView);
        //GridLayoutManager layoutManager = new GridLayoutManager(this,2);
        //LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        //layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
        StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(1,StaggeredGridLayoutManager.VERTICAL);
        rcView.setItemAnimator(new DefaultItemAnimator());
        //rcView.addItemDecoration();
        rcView.setLayoutManager(layoutManager);
        myApdater = new MyApdater(this,imageUrls);
        rcView.setAdapter(myApdater);
     /*   myApdater.setOnItemClickListener(new MyApdater.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
                Toast.makeText(MainActivity.this, position + " click", Toast.LENGTH_SHORT).show();
                imageUrls.remove(position);
                myApdater.notifyItemRemoved(position);
            }
        });*/


    }

    protected void initData()
    {
        imageUrls = new ArrayList<>();
        imageUrls.addAll(Arrays.asList(imgs));
    }




}