android 开发之 ListView 与Adapter 应用实践

在开发android中，listview 的应用显得非常频繁，只要需要显示列表展示的应用，可以说是必不可少，下面是记录开发中应用到listview与adapter 使用的实例：

listview 所在页面中的布局（listview_item.xml）：

<?xml version="1.0" encoding="utf-8"?>
<linearlayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:focusable="true"
    android:focusableintouchmode="true">
     <listview
             android:id="@+id/listview_item"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:divider="@null"
             android:scrollbars="none">
</linearlayout>

 adapter 展示的布局 （item.xml）：

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

    <linearlayout
        android:id="@+id/layout_sub_item_content"
        android:layout_width="match_parent"
        android:layout_height="50dp">

        <imageview
            android:id="@+id/img_choose"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:padding="10dp"
            android:src="@drawable/xuanzhong_icon"
            android:layout_gravity="center_vertical"
            />
        <textview
            android:id="@+id/textview_name"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="4"
            android:gravity="center_vertical"
            android:fontfamily="noto-sans-hans-regular"
            android:textsize="14sp"
            android:textcolor="#333333"
            android:text="项目名称"
            android:paddingleft="5dp"/>

        <textview
            android:id="@+id/textview_price"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="2"
            android:fontfamily="noto-sans-hans-regular"
            android:textsize="14sp"
            android:textcolor="#333333"
            android:text="454.0"
            android:gravity="center"/>

        <textview
            android:id="@+id/textview_vip"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="2"
            android:fontfamily="noto-sans-hans-regular"
            android:textsize="14sp"
            android:text="非会员价"
            android:gravity="center"
            android:textcolor="@color/red"/>


    </linearlayout>
</linearlayout>

  activity_item.java:

/**
 * 项目列表适配器
 */
private mybaseadapt iteminfoadapt;

@injectview(r.id.listview_item)
listview listview_item;

private class viewholder {
    textview textview_name;
    textview textview_price;
    textview textview_vip;
    imageview img_choose;
}
/**
*项目数据list
*/
private list<iteminfo> listiteminfo=new arraylist<>();

/**
 * 初始化列表
 */
private void inititemlistview() {
iteminfoadapt = new mybaseadapt<iteminfo>(this, r.layout.item, listiteminfo) {
            @override
            public view myadapt(int position, view convertview, view mview, list<iteminfo> mentitylist) {
                viewholder holder = null;
                if (convertview == null) {
                    convertview = mview;
                    holder = new viewholder();
                    holder.textview_name = (textview) convertview.findviewbyid(r.id.textview_name);
                    holder.textview_price = (textview) convertview.findviewbyid(r.id.textview_price);
                    holder.textview_vip = (textview) convertview.findviewbyid(r.id.textview_vip);
                    holder.img_choose=(imageview) convertview.findviewbyid(r.id.img_choose);
                    convertview.settag(holder);
                } else {
                    holder = (viewholder) convertview.gettag();
                }
                iteminfo iteminfo = mentitylist.get(position);
                holder.textview_name.settext(iteminfo.getname());
                holder.textview_price.settext(pricemanager.getprice(iteminfo.getpricestr(), iteminfo.getpricetypestr()).get(common.price_type_origin));
                holder.textview_vip.settext(pricemanager.getprice(iteminfo.getpricestr(), iteminfo.getpricetypestr()).get(common.price_type_pioneer));
                return convertview;
            }
        };
listview_item.setadapter(iteminfoadapt);
}