自定义Adapter

step1：自定义一个类

step2: 继承BaseAdapter重写函数。

step1：

package com.example.uilistviewtest;

public class Fruit {

    private String name;

    private int imageId;

    public Fruit(String name, int imageId) {
        this.name = name;
        this.imageId = imageId;
    }

    public String getName() {
        return name;
    }

    public int getImageId() {
        return imageId;
    }

}

step2:

package com.example.uilistviewtest;

import java.util.List;

import com.example.uilistviewtest.FruitAdapter.ViewHolder;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class FruitAdapter2 extends BaseAdapter {

    private Context context;
    private List<Fruit> mData;
    
    public FruitAdapter2(Context context,List<Fruit> mData) {
        // TODO Auto-generated constructor stub
        this.context = context;
        this.mData = mData;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return mData.size();
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return mData.get(position);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        Fruit fruit = (Fruit) getItem(position);
        View view;
        ViewHolder viewHolder;
        if (convertView == null) {
            view = LayoutInflater.from(context).inflate(R.layout.fruit_item, null);
            viewHolder = new ViewHolder();
            viewHolder.fruitImage = (ImageView) view.findViewById(R.id.fruit_image);
            viewHolder.fruitName = (TextView) view.findViewById(R.id.fruit_name);
            view.setTag(viewHolder);
        } else {
            view = convertView;
            viewHolder = (ViewHolder) view.getTag();
        }
        viewHolder.fruitImage.setImageResource(fruit.getImageId());
        viewHolder.fruitName.setText(fruit.getName());
        return view;
    }
    class ViewHolder {
        
        ImageView fruitImage;
        
        TextView fruitName;
        
    }
}