作业1---MyAdapter

最新推荐文章于 2023-11-13 17:01:45 发布

ch5211314

最新推荐文章于 2023-11-13 17:01:45 发布

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本文链接：https://blog.youkuaiyun.com/ch5211314/article/details/78994617

本文介绍了一个基于Android平台的自定义ListView适配器实现，该适配器使用Universal Image Loader加载图片，并根据不同位置显示不同布局，同时实现了缓存管理和错误处理。

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package com.example.com.zuoyelmh1;

import android.content.Context;
import android.graphics.Bitmap;
import android.support.v4.app.FragmentActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;

import java.util.List;

/**
 * Created by linmeihui on 2018/1/4.
 */

class MyAdapter extends BaseAdapter{
    List<ResultData1.NewslistBean> newslist;
    Context context;
    private DisplayImageOptions options;
    public MyAdapter(List<ResultData1.NewslistBean> newslist, Context context) {
        this.context=context;
        this.newslist=newslist;

        options = new DisplayImageOptions.Builder()
                .cacheInMemory(true)//使用内存缓存
                .cacheOnDisk(true)//使用磁盘缓存
                .showImageOnLoading(R.mipmap.ic_launcher)//设置正在下载的图片
                .showImageForEmptyUri(R.mipmap.ic_launcher)//url为空或请求的资源不存在时
                .showImageOnFail(R.mipmap.ic_launcher)//下载失败时显示的图片
                .bitmapConfig(Bitmap.Config.RGB_565)//设置图片色彩模式 1px=2字节
                .imageScaleType(ImageScaleType.EXACTLY)//设置图片的缩放模式
                // .displayer(new RoundedBitmapDisplayer(0))//设置圆角 30代表半径 自定义
                .build();
    }

    @Override
    public int getViewTypeCount() {
        return 2;
    }

    @Override
    public int getItemViewType(int position) {

        if(position%2 == 0){
            return 0;
        }else{
            return 1;
        }


    }

    @Override
    public int getCount() {
        return newslist.size();
    }

    @Override
    public Object getItem(int i) {
        return newslist.get(i);
    }

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

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        int itemViewType = getItemViewType(i);
        if(itemViewType ==0 ) {
            ViewHolder1 holder1;
            if (view==null){
                view=View.inflate(context,R.layout.list_item1,null);
                holder1=new ViewHolder1();
                holder1.tv1=view.findViewById(R.id.tv1);
                holder1.tv2=view.findViewById(R.id.tv2);
                holder1.img=view.findViewById(R.id.img);
                view.setTag(holder1);
            }else {
                holder1= (ViewHolder1) view.getTag();
            }   holder1.tv1.setText(newslist.get(i).getTitle());
            holder1.tv2.setText(newslist.get(i).getCtime());

            ImageLoader.getInstance().displayImage(newslist.get(i).getPicUrl(),holder1.img,options);
            return view;
        }else{
            ViewHolder2 holder2;
            if (view==null){
                view=View.inflate(context,R.layout.list_item2,null);
                holder2=new ViewHolder2();
                holder2.tv1=view.findViewById(R.id.tv1);
                holder2.tv2=view.findViewById(R.id.tv2);
                holder2.img=view.findViewById(R.id.img);
                view.setTag(holder2);
            }else {
                holder2= (ViewHolder2) view.getTag();
            }   holder2.tv1.setText(newslist.get(i).getTitle());
                holder2.tv2.setText(newslist.get(i).getCtime());
                ImageLoader.getInstance().displayImage(newslist.get(i).getPicUrl(),holder2.img,options);
            return view;
        }

    }

    class ViewHolder1{
        TextView tv1,tv2;
        ImageView img;
    }
    class ViewHolder2{
        TextView tv1,tv2;
        ImageView img;
    }

}