eatwhatApp开发实战（三）

    <RelativeLayout 
        android:id="@+id/et_relative"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <Button 
            android:id="@+id/add_shop_btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:text="@string/add_shop_btn_text"
            android:onClick="addShop"/>
        <EditText 
            android:id="@+id/addshop_et"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_toLeftOf="@id/add_shop_btn"
            android:textSize="18sp"/>
    </RelativeLayout>    
    <TextView
        android:id="@+id/shop_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/shop_name"
        android:layout_below="@id/et_relative"
        android:paddingTop="20dp"
        android:textSize="18sp" />    
    <Button         
        android:id="@+id/random_btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/shop_name"
        android:text="@string/random_btn_text"/>
    <ListView 
        android:id="@+id/lv_shop"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/random_btn"
        />    

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
    <TextView 
        android:id="@+id/item_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:layout_centerInParent="true"
        android:text="店名"/>
</RelativeLayout>

public class Shop {
    
    private String name;
    
    public Shop(String name) {
        this.name = name;
    }
    
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
    
}

　　//内部类 适配器继承BaseAdapter
    class ShopInfoAdapter extends BaseAdapter{

        @Override
        public int getCount() {
            
            return shopList.size();
        }
        
        @SuppressLint("ViewHolder")
        @Override
        public View getView(int position, View converView, ViewGroup parent) {
            
            View v = View.inflate(MainActivity.this, R.layout.item_shop, null);
            
            TextView tv_name = (TextView)v.findViewById(R.id.item_text);
            
            tv_name.setText(shopList.get(position).getName());
            
            return v;
        }
        @Override
        public Object getItem(int arg0) {

            return null;
        }

        @Override
        public long getItemId(int arg0) {

            return 0;
        }    
    }

    //Shop类型
    private List<Shop> shopList;
    //listview控件
    private ListView shop_lv;
    //适配器
    private ShopInfoAdapter shopAdapter;

//初始化控件listview
shop_lv = (ListView) findViewById(R.id.lv_shop);
        
//初始化适配器
shopAdapter = new ShopInfoAdapter();
        
//设置适配器
shop_lv.setAdapter(shopAdapter);

　　　　　if (addName != null && !"".equals(addName)){
            //List shop添加店名
            Shop shop = new Shop(addName);
            //添加新实例化的shop对象
            shopList.add(shop);
            //刷新listview
            shopAdapter.notifyDataSetChanged();    
            //清空文本框内容
            addshop_et.setText("");
            
            String toast_text = "添加店铺：" + addName;
            
            Toast.makeText(MainActivity.this, toast_text, Toast.LENGTH_SHORT).show();            
        } else{    
            Toast.makeText(MainActivity.this, "添加内容为空", Toast.LENGTH_SHORT).show();        
        }

shop_name.setText(shopList.get(num).getName());