CustomAdpater.java

package com.example.android.listviewexam;

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;

import java.util.List;

public class CustomAdapter extends BaseAdapter {

    private List<People> mData;
    private Context mContext;

    public CustomAdapter(Context context, List<People> data) {
        mContext = context;
        mData = data;
    }

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

    @Override
    public Object getItem(int position) {
        return mData.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;

        if (convertView == null) {
            // View 를 처음 로딩 할 때
            convertView = LayoutInflater.from(mContext).inflate(R.layout.people_item, parent, false);
            ImageView image = (ImageView)convertView.findViewById(R.id.image);
            TextView name = (TextView)convertView.findViewById(R.id.name);
            TextView phone = (TextView)convertView.findViewById(R.id.phoneNumber);

            holder = new ViewHolder();
            holder.image = image;
            holder.name = name;
            holder.phone = phone;

            convertView.setTag(holder);
        } else {
            // View 재사용
            holder = (ViewHolder) convertView.getTag();
        }

        // View 에 표시 할 Data 취득
        People people = (People)getItem(position);

        holder.image.setImageResource(people.getImageResourceId());
        holder.name.setText(people.getName());
        holder.phone.setText(people.getPhoneNumber());

        // 완성 된 View 리턴
        return convertView;
    }

    static class ViewHolder {
        ImageView image;
        TextView name;
        TextView phone;
    }
}