适配器展示多条目1,2,3

最新推荐文章于 2019-01-19 23:58:55 发布

原创最新推荐文章于 2019-01-19 23:58:55 发布 · 200 阅读

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CC 4.0 BY-SA版权

这个博客介绍了如何在Android中创建一个自定义BaseAdapter，以适配包含不同数量图片的列表项。适配器根据数据源动态加载不同布局，包括单图、双图和三图的显示，并使用Universal Image Loader库进行图片加载。

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package com.example.com.xiangmu_lmh;

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 com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;

import java.util.List;

/**
 * Created by linmeihui on 2018/1/15.
 */

class MyAdapter extends BaseAdapter{
    Context context;
    List<ResultData.ResultBean.DataBean> list;
    private final DisplayImageOptions options;

    public MyAdapter(Context context, List<ResultData.ResultBean.DataBean> list) {
        this.context=context;
        this.list=list;


        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(100))//设置圆角 30代表半径 自定义
                .build();
    }

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

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

    @Override
    public int getViewTypeCount() {
        return 3;
    }

    @Override
    public int getItemViewType(int position) {
        String pic = list.get(position).getThumbnail_pic_s();
        String pic02 = list.get(position).getThumbnail_pic_s02();
        String pic03 = list.get(position).getThumbnail_pic_s03();
        if(pic != null && pic02 == null && pic03 == null){
            return  0;
        }else if(pic != null && pic02 != null && pic03 == null){
            return 1;
        }else {
            return 2;
        }
    }

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

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {

        int type = getItemViewType(i);
        if (type==0){

            ViewHolder holder;
            if (view==null){
                view=View.inflate(context,R.layout.fra_item,null);
                holder=new ViewHolder();
                holder.img=view.findViewById(R.id.img);
                holder.tv=view.findViewById(R.id.tv);
                view.setTag(holder);
            }else {
                holder= (ViewHolder) view.getTag();
            }       holder.tv.setText(list.get(i).getTitle());

            ImageLoader.getInstance().displayImage(list.get(i).getThumbnail_pic_s(),holder.img,options);
            return view;
        }else if(type==1){
            ViewHolder2 holder2;
            if (view==null){
                view=View.inflate(context,R.layout.fra_item2,null);
                holder2=new ViewHolder2();
                holder2.img1=view.findViewById(R.id.img1);
                holder2.img2=view.findViewById(R.id.img2);
                holder2.tv=view.findViewById(R.id.tv);
                view.setTag(holder2);
            }else {
                holder2= (ViewHolder2) view.getTag();
            }       holder2.tv.setText(list.get(i).getTitle());

            ImageLoader.getInstance().displayImage(list.get(i).getThumbnail_pic_s(),holder2.img1,options);
            ImageLoader.getInstance().displayImage(list.get(i).getThumbnail_pic_s02(),holder2.img2,options);
            return view;
        }else {
            ViewHolder3 holder3;
            if (view==null){
                view=View.inflate(context,R.layout.fra_item3,null);
                holder3=new ViewHolder3();
                holder3.img1=view.findViewById(R.id.img1);
                holder3.img2=view.findViewById(R.id.img2);
                holder3.img3=view.findViewById(R.id.img3);
                holder3.tv=view.findViewById(R.id.tv);
                view.setTag(holder3);
            }else {
                holder3= (ViewHolder3) view.getTag();
            }       holder3.tv.setText(list.get(i).getTitle());

            ImageLoader.getInstance().displayImage(list.get(i).getThumbnail_pic_s(),holder3.img1,options);
            ImageLoader.getInstance().displayImage(list.get(i).getThumbnail_pic_s02(),holder3.img2,options);
            ImageLoader.getInstance().displayImage(list.get(i).getThumbnail_pic_s03(),holder3.img3,options);
            return view;
        }

    }


    class ViewHolder{
        TextView tv;
        ImageView img;
    }
    class ViewHolder2{
        TextView tv;
        ImageView img1;
        ImageView img2;
    }
    class ViewHolder3{
        TextView tv;
        ImageView img1;
        ImageView img2;
        ImageView img3;
    }
}