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ExpandableListView实现商品列表折叠详解手机开发

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简介

在日常的开发中，有可能会遇到需要一些可以展开的列表，比如QQ的好友列表，电商的购物车折叠显示。Android也给我们提供ExpandableListView类，完美实现这样类似的需求, 极大的方便了我们开发。结合之前的项目我们做一个简单的讲解。
首先懒看一下最终的实现效果：
这里写图片描述
使用到的第三方框架：
AndroidAutoLayout 屏幕适配框架

代码

首先是布局需要用一个ExpandableListView，配合adapter就能实现上面额效果，直接上代码。
activity_main.xml

<com.zhy.autolayout.AutoLinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:orientation="vertical"> 
 
  <android.support.design.widget.AppBarLayout xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:app="http://schemas.android.com/apk/res-auto" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content"> 
 
      <com.zhy.autolayout.AutoLinearLayout 
          android:id="@+id/ll_title_root" 
          android:layout_width="match_parent" 
          android:layout_height="wrap_content" 
          android:background="#ec0f38" 
          android:orientation="vertical"> 
 
          <com.zhy.autolayout.AutoFrameLayout 
              android:layout_width="match_parent" 
              android:layout_height="88px"> 
 
              <TextView 
                  android:id="@+id/tv_title" 
                  android:layout_width="wrap_content" 
                  android:layout_height="fill_parent" 
                  android:layout_gravity="center" 
                  android:gravity="center" 
                  android:text="优惠套餐" 
                  android:textColor="#ffffff" 
                  android:textSize="32px" /> 
 
              <com.zhy.autolayout.AutoLinearLayout 
                  android:id="@+id/ll_back" 
                  android:layout_width="100px" 
                  android:layout_height="match_parent" 
                  android:clickable="true" 
                  android:gravity="center"> 
 
                  <ImageView 
                      android:id="@+id/iv_back" 
                      android:layout_width="44px" 
                      android:layout_height="44px" 
                      android:layout_gravity="center_vertical" 
                      android:src="@mipmap/icon_back" /> 
              </com.zhy.autolayout.AutoLinearLayout> 
          </com.zhy.autolayout.AutoFrameLayout> 
      </com.zhy.autolayout.AutoLinearLayout> 
  </android.support.design.widget.AppBarLayout> 
 
  <ExpandableListView 
      android:id="@+id/elv_collocation" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:background="#eeeff3" 
      android:divider="#eeeff3" 
      android:dividerHeight="0dp" 
      android:groupIndicator="@null" 
      android:listSelector="@null" /> 
</com.zhy.autolayout.AutoLinearLayout>

MainActivity.java
默认展开第一个，collocation.expandGroup(0);当然更好的写法是将数据写到Controller中。

public class MainActivity extends AppCompatActivity { 
  private ExpandableListView elv_collocation; 
  private List<CollocationPackageBean> collocationList; 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_main); 
      elv_collocation = (ExpandableListView) findViewById(R.id.elv_collocation); 
      initData(); 
  } 
 
  private void initData() { 
      collocationList = new ArrayList<>(); 
      CollocationPackageBean collocation_1 = new CollocationPackageBean(); 
      CollocationPackageBean collocation_2 = new CollocationPackageBean(); 
 
      collocation_1.setTotalPrice(new BigDecimal(897)); 
      collocation_1.setDiscountFee(new BigDecimal(20)); 
      collocation_1.setName("818国货套餐3"); 
      List<CollocationPackageBean.CollocationSkuBean> goodsList_1 = new ArrayList<>(); 
      goodsList_1.add(new CollocationPackageBean.CollocationSkuBean("Meizu/魅族 魅蓝 note3 全网通 手机 银白 16GB", "http://img11.hqbcdn.com/product/07/0a/070ac7abd57c6d9251d89547f3d62501.jpg")); 
      goodsList_1.add(new CollocationPackageBean.CollocationSkuBean("VR PLUS 智能眼镜vr虚拟现实头盔 3D沉浸式 暴风魔镜 vr plus 智能头盔 白色", "http://img15.hqbcdn.com/product/c6/10/c610075082199955a8d5dcf2aa765b17.jpg")); 
      collocation_1.setCollocationSkuDoList(goodsList_1); 
 
      collocation_2.setTotalPrice(new BigDecimal(1034)); 
      collocation_2.setDiscountFee(new BigDecimal(26)); 
      collocation_2.setName("超值套餐"); 
      List<CollocationPackageBean.CollocationSkuBean> goodsList_2 = new ArrayList<>(); 
      goodsList_2.add(new CollocationPackageBean.CollocationSkuBean("Meizu/魅族 魅蓝 note3 全网通 手机 银白 16GB", "http://img11.hqbcdn.com/product/07/0a/070ac7abd57c6d9251d89547f3d62501.jpg")); 
      goodsList_2.add(new CollocationPackageBean.CollocationSkuBean("Uka/优加 Meizu/魅族 魅蓝 note3全覆盖全屏钢化玻璃膜 白色", "http://img8.hqbcdn.com/product/9c/15/9c15571aa92905ea1edafb0a288f1ebb.jpg")); 
      goodsList_2.add(new CollocationPackageBean.CollocationSkuBean("SanDisk/闪迪 至尊高速MicroSDHC-TF移动存储卡 Class10-48MB/S 升级版 16G", "http://img14.hqbcdn.com/product/29/cd/29cda69f5036b38454b6592f96fde774.jpg")); 
      goodsList_2.add(new CollocationPackageBean.CollocationSkuBean("Huawei/华为 AM116 金属耳机 三键线控耳机 尊爵版", "http://img9.hqbcdn.com/product/0a/90/0a905d9988c91fb0625d9ee44377c8e0.jpg")); 
      goodsList_2.add(new CollocationPackageBean.CollocationSkuBean("Lesimo/梵简 初见系列10000毫安充电宝 手机平板通用 移动电源 黑色", "http://img11.hqbcdn.com/product/67/3a/673ac0343758ce64e97c2d9986cbbef3.jpg")); 
      collocation_2.setCollocationSkuDoList(goodsList_2); 
 
      collocationList.add(collocation_1); 
      collocationList.add(collocation_2); 
      elv_collocation.setAdapter(new CollocationListAdapter(this, elv_collocation, collocationList)); 
      elv_collocation.expandGroup(0); 
  } 
}

CollocationListAdapter.java
CollocationListAdapter负责数据的填充，主要注意两个方法：getGroupView和getChildView

public class CollocationListAdapter extends BaseExpandableListAdapter { 
    private LayoutInflater inflater; 
    private Context context; 
    private ExpandableListView elv_collocation; 
    private List<CollocationPackageBean> data; 
 
    public CollocationListAdapter(Context context, ExpandableListView elv_collocation, List<CollocationPackageBean> data) { 
        this.context = context; 
        this.elv_collocation = elv_collocation; 
        this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
        this.data = data; 
    } 
 
    @Override 
    public int getGroupCount() { 
        return data.size(); 
    } 
 
    @Override 
    public int getChildrenCount(int groupPosition) { 
        return data.get(groupPosition).getCollocationSkuDoList().size(); 
    } 
 
    @Override 
    public Object getGroup(int groupPosition) { 
        return data.get(groupPosition); 
    } 
 
    @Override 
    public Object getChild(int groupPosition, int childPosition) { 
        return data.get(groupPosition).getCollocationSkuDoList().get(childPosition); 
    } 
 
    @Override 
    public long getGroupId(int groupPosition) { 
        return groupPosition; 
    } 
 
    @Override 
    public long getChildId(int groupPosition, int childPosition) { 
        return childPosition; 
    } 
 
    @Override 
    public boolean hasStableIds() { 
        return true; 
    } 
 
    @Override 
    public boolean isChildSelectable(int groupPosition, int childPosition) { 
        return true;//如果子条目需要响应click事件,必需返回true 
    } 
 
    @Override 
    public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { 
        ParentViewHolder parentViewHolder; 
        if (null == convertView) { 
            convertView = inflater.inflate(R.layout.collocation_list_item_parent, parent, false); 
            parentViewHolder = new ParentViewHolder(convertView); 
            convertView.setTag(parentViewHolder); 
            AutoUtils.auto(convertView); 
        } else { 
            parentViewHolder = (ParentViewHolder) convertView.getTag(); 
        } 
        CollocationPackageBean collocationPackageBean = data.get(groupPosition); 
        parentViewHolder.tv_collocation_name.setText(TextUtils.isEmpty(collocationPackageBean.getName()) ? "优惠套餐" : collocationPackageBean.getName()); 
        parentViewHolder.tv_save_text.setText("立省￥" + collocationPackageBean.getDiscountFee()); 
        parentViewHolder.iv_status.setImageResource(isExpanded ? R.mipmap.icon_top : R.mipmap.icon_bottom); 
        parentViewHolder.v_space.setVisibility(isExpanded ? View.GONE : View.VISIBLE); 
        parentViewHolder.hsv_goods_list.setVisibility(isExpanded ? View.GONE : View.VISIBLE); 
        parentViewHolder.hsv_goods_list.setFocusable(false);//设置后解决套餐无法正常展开的bug 
        if (!isExpanded) { 
            //设置套餐折叠时显示套餐商品的图片 
            initGoodsImage(collocationPackageBean, parentViewHolder, groupPosition); 
        } 
        return convertView; 
    } 
 
    @Override 
    public View getChildView(final int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { 
        ChildViewHolder childViewHolder; 
        if (null == convertView) { 
            convertView = inflater.inflate(R.layout.collocation_list_item_child, parent, false); 
            childViewHolder = new ChildViewHolder(convertView); 
            convertView.setTag(childViewHolder); 
            AutoUtils.auto(convertView); 
        } else { 
            childViewHolder = (ChildViewHolder) convertView.getTag(); 
        } 
        final CollocationPackageBean.CollocationSkuBean collocationSkuBean = data.get(groupPosition).getCollocationSkuDoList().get(childPosition); 
        childViewHolder.sdv_goods_img.setImageURI(Uri.parse(collocationSkuBean.getImageMd5())); 
        childViewHolder.tv_goods_title.setText(collocationSkuBean.getSkuTitle()); 
        childViewHolder.ll_root_view.setOnClickListener(new View.OnClickListener() { 
            @Override 
            public void onClick(View v) { 
                //进入商品详情页操作 
            } 
        }); 
        if (childPosition == data.get(groupPosition).getCollocationSkuDoList().size() - 1) { 
            //当前套餐的最后一个商品 
            childViewHolder.ll_bottom.setVisibility(View.VISIBLE); 
            childViewHolder.tv_collocation_price.setText(data.get(groupPosition).getTotalPrice().toString()); 
            childViewHolder.tv_add_cart.setOnClickListener(new View.OnClickListener() { 
                @Override 
                public void onClick(View v) { 
                    //把套餐商品加入购物车操作 
                } 
            }); 
        } else { 
            childViewHolder.ll_bottom.setVisibility(View.GONE); 
        } 
        return convertView; 
    } 
 
    class ParentViewHolder { 
        private View v_space; 
        private ImageView iv_status; 
        private HorizontalScrollView hsv_goods_list; 
        private TextView tv_collocation_name, tv_save_text; 
 
        private ParentViewHolder (View view) { 
            v_space = view.findViewById(R.id.v_space); 
            iv_status = (ImageView) view.findViewById(R.id.iv_status); 
            hsv_goods_list = (HorizontalScrollView) view.findViewById(R.id.hsv_goods_list); 
            tv_collocation_name = (TextView) view.findViewById(R.id.tv_collocation_name); 
            tv_save_text = (TextView) view.findViewById(R.id.tv_save_text); 
        } 
    } 
 
    private class ChildViewHolder { 
        private SimpleDraweeView sdv_goods_img; 
        private LinearLayout ll_bottom, ll_root_view; 
        private TextView tv_add_cart, tv_goods_title, tv_collocation_price; 
 
        private ChildViewHolder (View view) { 
            sdv_goods_img = (SimpleDraweeView) view.findViewById(R.id.sdv_goods_img); 
            ll_bottom = (LinearLayout) view.findViewById(R.id.ll_bottom); 
            ll_root_view = (LinearLayout) view.findViewById(R.id.ll_root_view); 
            tv_add_cart = (TextView) view.findViewById(R.id.tv_add_cart); 
            tv_goods_title = (TextView) view.findViewById(R.id.tv_goods_title); 
            tv_collocation_price = (TextView) view.findViewById(R.id.tv_collocation_price); 
        } 
    } 
 
    /** 
     * 初始化并设置套餐折叠时的所有商品图片 
     * @param collocationPackageBean 
     * @param parentViewHolder 
     * @param groupPosition 
     */ 
    private void initGoodsImage(CollocationPackageBean collocationPackageBean, 
                                ParentViewHolder parentViewHolder, final int groupPosition) { 
        View collocationView; 
        SimpleDraweeView sdv_cart_image; 
        RelativeLayout rl_middle; 
        LinearLayout rootview = new LinearLayout(context); 
        for (int i = 0, len = collocationPackageBean.getCollocationSkuDoList().size(); i < len; i++) { 
            collocationView = inflater.inflate(R.layout.item_gift_img, null); 
            sdv_cart_image = (SimpleDraweeView) collocationView.findViewById(R.id.sdv_cart_image); 
            rl_middle = (RelativeLayout) collocationView.findViewById(R.id.rl_middle); 
            sdv_cart_image.setImageURI(Uri.parse(collocationPackageBean.getCollocationSkuDoList().get(i).getImageMd5())); 
            rl_middle.setVisibility(View.INVISIBLE); 
            collocationView.setOnClickListener(new View.OnClickListener() { 
                @Override 
                public void onClick(View v) { 
                    //手动实现展开操作 
                    elv_collocation.expandGroup(groupPosition); 
                } 
            }); 
            AutoUtils.auto(collocationView); 
            rootview.addView(collocationView); 
        } 
        parentViewHolder.hsv_goods_list.removeAllViews(); 
        parentViewHolder.hsv_goods_list.addView(rootview); 
    } 
}

collocation_list_item_child.xml
子布局

<com.zhy.autolayout.AutoLinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  xmlns:fresco="http://schemas.android.com/apk/res-auto" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:background="#ffffff" 
  android:clickable="true" 
  android:orientation="vertical"> 
 
  <com.zhy.autolayout.AutoLinearLayout 
      android:id="@+id/ll_root_view" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:background="@drawable/selector_me_bg_item" 
      android:paddingBottom="28px" 
      android:paddingLeft="24px" 
      android:paddingRight="24px" 
      android:paddingTop="30px"> 
 
      <com.facebook.drawee.view.SimpleDraweeView 
          android:id="@+id/sdv_goods_img" 
          android:layout_width="120px" 
          android:layout_height="120px" 
          android:background="@drawable/shape_cart_goods_border" 
          android:padding="1dp" 
          fresco:placeholderImage="@mipmap/icon_loading_bg" /> 
 
      <TextView 
          android:id="@+id/tv_goods_title" 
          android:layout_width="0dp" 
          android:layout_height="wrap_content" 
          android:layout_marginLeft="20px" 
          android:layout_weight="1" 
          android:ellipsize="end" 
          android:maxLines="2" 
          android:textColor="#222222" 
          android:textSize="30px" /> 
 
      <View 
          android:layout_width="118px" 
          android:layout_height="1px" /> 
 
      <ImageView 
          android:layout_width="18px" 
          android:layout_height="28px" 
          android:src="@mipmap/icon_right" /> 
  </com.zhy.autolayout.AutoLinearLayout> 
 
  <View 
      android:layout_width="match_parent" 
      android:layout_height="1px" 
      android:layout_marginLeft="24px" 
      android:background="#dddddd" /> 
 
  <com.zhy.autolayout.AutoLinearLayout 
      android:id="@+id/ll_bottom" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:orientation="vertical"> 
 
      <com.zhy.autolayout.AutoLinearLayout 
          android:layout_width="match_parent" 
          android:layout_height="wrap_content" 
          android:gravity="center_vertical" 
          android:paddingLeft="24px" 
          android:paddingRight="24px" 
          android:paddingTop="20px"> 
 
          <TextView 
              android:layout_width="wrap_content" 
              android:layout_height="wrap_content" 
              android:text="套餐价格:" 
              android:textColor="#888888" 
              android:textSize="30px" /> 
 
          <TextView 
              android:layout_width="wrap_content" 
              android:layout_height="wrap_content" 
              android:layout_marginLeft="20px" 
              android:text="￥" 
              android:textColor="#ec0f38" 
              android:textSize="22px" /> 
 
          <TextView 
              android:id="@+id/tv_collocation_price" 
              android:layout_width="wrap_content" 
              android:layout_height="wrap_content" 
              android:textColor="#ec0f38" 
              android:textSize="30px" /> 
 
          <View 
              android:layout_width="0dp" 
              android:layout_height="0dp" 
              android:layout_weight="1" /> 
 
          <TextView 
              android:id="@+id/tv_add_cart" 
              android:layout_width="180px" 
              android:layout_height="50px" 
              android:background="@drawable/selector_add_cart_red_btn" 
              android:gravity="center" 
              android:text="加入购物车" 
              android:textColor="@drawable/selector_add_cart_red_tv" 
              android:textSize="28px" /> 
      </com.zhy.autolayout.AutoLinearLayout> 
 
      <View 
          android:layout_width="match_parent" 
          android:layout_height="20px" 
          android:layout_marginTop="20px" 
          android:background="#eeeff3" /> 
  </com.zhy.autolayout.AutoLinearLayout> 
</com.zhy.autolayout.AutoLinearLayout>

collocation_list_item_parent.xml
父布局

<com.zhy.autolayout.AutoLinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:background="#ffffff" 
  android:orientation="vertical" 
  android:paddingTop="20px"> 
 
  <com.zhy.autolayout.AutoLinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="50px" 
      android:layout_marginBottom="30px" 
      android:gravity="center_vertical" 
      android:paddingLeft="24px" 
      android:paddingRight="24px"> 
 
      <TextView 
          android:id="@+id/tv_collocation_name" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:textColor="#222222" 
          android:textSize="30px" /> 
 
      <TextView 
          android:id="@+id/tv_save_text" 
          android:layout_width="wrap_content" 
          android:layout_height="40px" 
          android:layout_marginLeft="20px" 
          android:background="@drawable/shape_save_money" 
          android:gravity="center" 
          android:paddingLeft="18px" 
          android:paddingRight="18px" 
          android:textColor="#ffffff" 
          android:textSize="24px" /> 
 
      <View 
          android:layout_width="0dp" 
          android:layout_height="1px" 
          android:layout_weight="1" /> 
 
      <ImageView 
          android:id="@+id/iv_status" 
          android:layout_width="28px" 
          android:layout_height="18px" 
          android:layout_gravity="right|center_vertical" 
          android:src="@mipmap/icon_top" /> 
  </com.zhy.autolayout.AutoLinearLayout> 
 
  <HorizontalScrollView 
      android:id="@+id/hsv_goods_list" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:paddingLeft="24px" 
      android:scrollbars="none" /> 
 
  <View 
      android:id="@+id/v_space" 
      android:layout_width="match_parent" 
      android:layout_height="20px" 
      android:layout_marginTop="20px" 
      android:background="#eeeff3" 
      android:visibility="gone" /> 
</com.zhy.autolayout.AutoLinearLayout>

这样就基本实现了。源码地址

原创文章，作者：奋斗，如若转载，请注明出处：https://blog.ytso.com/tech/app/5531.html

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