package codefirst.listview_test;

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;


/**
 * Created by cheng on 2017/1/25.
 */
//自定義的介面卡

public class MyAdapter extends BaseAdapter {

    private List dataList;      //裝載資料來源
    //private Context context;    //getView（）方法的佈局裝載器需要用到
    private LayoutInflater layoutInflater;      //佈局裝載器

    public MyAdapter(List dataList, Context context) {
        this.layoutInflater=LayoutInflater.from(context);
        this.dataList = dataList;
    }

    @Override
    public int getCount() {
        return dataList.size();
    }
//物件
    @Override
    public Object getItem(int position) {
        return dataList.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup viewGroup) {
        ViewHolder viewHolder=new ViewHolder(); //裝載id的中介
        if(convertView==null){      //將二者繫結
            convertView=layoutInflater.inflate(R.layout.lv_item,null);
            viewHolder.itemImage= (ImageView) convertView.findViewById(R.id.iv_icon);
                        //用來裝載控制元件，這樣可以不用每次去findId
            viewHolder.itemName= (TextView) convertView.findViewById(R.id.tv_iconName);
            convertView.setTag(viewHolder);
        }else {
            viewHolder= (ViewHolder) convertView.getTag();
        }
        ItemBean bean=dataList.get(position);   //通過ViewHolder找到對應控制元件
        viewHolder.itemImage.setImageResource(bean.itemImageId);
        viewHolder.itemName.setText(bean.itemName);
        return convertView;
        //findID沒有再用一箇中介去儲存
   /*     if(convertView==null){
            convertView=layoutInflater.inflate(R.layout.lv_item,null);
                //快取機制
            ItemBean bean=dataList.get(position);       //一個項
            ImageView itemImage= (ImageView) convertView.findViewById(R.id.iv_icon);
            TextView itemName= (TextView) convertView.findViewById(R.id.tv_iconName);
            itemImage.setImageResource(bean.itemImageId);
            itemName.setText(bean.itemName);
        }*/
        //沒有用到快取
     /*   View view=layoutInflater.inflate(R.layout.lv_item,null);
     /*                       //將一個佈局檔案轉化為一個view
        ItemBean bean=dataList.get(position);       //一個item項的內容
        ImageView imageView= (ImageView) view.findViewById(R.id.iv_icon);
        TextView textView= (TextView) view.findViewById(R.id.tv_iconName);
        imageView.setImageResource(bean.itemImageId);   //物件呼叫成員屬性
        textView.setText(bean.itemName);

        return view;*/
        //return convertView;

    }
//自定義泛型----內部類
    private class ViewHolder {
        private ImageView itemImage;
        private TextView itemName;      //一個ListView項的名稱
    }
}package codefirst.listview_test;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListView;

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

public class MainActivity extends AppCompatActivity {

    private String iconName_res[]={"通訊錄","漂亮","日曆","相機","鬧鐘","遊戲",
            "簡訊","音樂","河流","設定","氣球","天氣","地圖","視訊"};   //名稱資料來源
    private int iconImage_res[]={R.mipmap.address_book,R.mipmap.beau,R.mipmap.calendar,
        R.mipmap.camera,R.mipmap.clock,R.mipmap.games_control,R.mipmap.messenger,
        R.mipmap.ringtone,R.mipmap.riven,R.mipmap.settings,R.mipmap.speech_balloon,
        R.mipmap.weather,R.mipmap.world,R.mipmap.youtube};

    private List dataList;     //裝載資料來源
    private MyAdapter adapter;
    private ListView listItem_lv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initData();
        initAdapter();
        listItem_lv= (ListView) findViewById(R.id.lv_main);
        listItem_lv.setAdapter(adapter);

    }

    private void initAdapter() {
        adapter=new MyAdapter(dataList,this);

    }

    //初始化資料來源
    private void initData() {
        dataList=new ArrayList<>();
        for(int i=0;i