ListView 或 Recyclerview 子项里面再添加子项

来源：互联网发布：楠木鞋架淘宝编辑：程序博客网时间：2024/05/16 10:46

今天我写下关于，ListView 或 Recyclerview 子项里面再添加子项，或者是点击子项，展开该子项的子项信息，先看看xml代码
下面是MaintActivit里面的代码

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent">   <ListView       android:id="@+id/list"       android:layout_width="match_parent"       android:layout_height="match_parent"/></RelativeLayout>

然后看看item里面的布局

<?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:orientation="vertical">    <TextView        android:id="@+id/bean_title"        android:layout_width="match_parent"        android:layout_height="wrap_content" />    <LinearLayout        android:id="@+id/ll_order"        android:visibility="gone"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="vertical" />    <View        android:layout_width="match_parent"        android:layout_height="1px"        android:background="@color/colorAccent" /></LinearLayout>

我这个里面放了一个 LinearLayout,设置它是不可以见的，然后通过代码的方式去addView进入LinearLayout，然后再看看LinearLyout里面我的View

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    <TextView        android:id="@+id/order_title"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <TextView        android:id="@+id/order_message"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></LinearLayout>

OK，xml代码写完了，然后看看代码吧，嘻嘻
MainActivity:

private ListView list;    private Adapter adapter;    private List<Bean> beanList;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        beanList = new ArrayList<>();        list = (ListView) this.findViewById(R.id.list);        for (int i=0;i<30;i++){            List<Order> orderList = new ArrayList<>();            Bean bean = new Bean();            bean.setTitle("天猫"+i);            if (i%2==0){                Order order = new Order();                order.setTitle("京东"+i);                order.setTitle("京东信息"+i);                Order order2 = new Order();                order2.setTitle("京东2"+i);                order2.setTitle("京东信息2"+i);                orderList.add(order);                orderList.add(order2);            }else {                Order order = new Order();                order.setTitle("京东"+i);                order.setTitle("京东信息"+i);                orderList.add(order);            }            bean.setOrderList(orderList);            beanList.add(bean);        }        adapter = new Adapter(beanList,this);        list.setAdapter(adapter);    }

我觉得上面的大家都看得懂
然后看看关键的Adapter
Adapter:

 private List<Bean> beanList;    private Activity mActivity;    int currentItem=-1;    public Adapter(List<Bean> beanList, Activity mActivity) {        this.beanList = beanList;        this.mActivity = mActivity;    }    @Override    public int getCount() {        return beanList.size();    }    @Override    public Bean getItem(int position) {        return beanList.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(final int position, View convertView, ViewGroup parent) {        ViewHolder holder;        Bean bean = beanList.get(position);        if (convertView == null) {            holder = new ViewHolder();            convertView = LayoutInflater.from(mActivity).inflate(R.layout.item_bean, parent, false);            holder.textView = (TextView) convertView.findViewById(R.id.bean_title);            holder.linearLayout = (LinearLayout) convertView.findViewById(R.id.ll_order);            convertView.setTag(holder);        } else {            holder = (ViewHolder) convertView.getTag();        }        holder.textView.setText(bean.getTitle());        setItmes(bean.getOrderList(), holder.linearLayout);    //控制条目隐藏和显示        if (currentItem==position){            holder.linearLayout.setVisibility(View.VISIBLE);        }else {            holder.linearLayout.setVisibility(View.GONE);        }        holder.textView.setTag(position);        holder.textView.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                int tag = (int) v.getTag();                if (tag == currentItem) {                    currentItem = -1;                } else {                    currentItem = tag;                }                notifyDataSetChanged();//数据源改变            }        });        return convertView;    }//给LinearLyout 添加子视图    private void setItmes(List<Order> orderList, LinearLayout linearLayout) {        if (orderList == null || orderList.isEmpty()) {//如果没有子项，就删除子项容器里原有的子项视图            linearLayout.removeAllViews();            return;        }        int childCount = linearLayout.getChildCount();        int itemSize = orderList.size();//这里的目的是为了防止linearLayout 无限制的增加，因为这个是用在复用里面的        if (itemSize > childCount) {            for (int i = 0; i < (itemSize - childCount); i++) {                linearLayout.addView(LayoutInflater.from(mActivity).inflate(R.layout.item_order, null));            }        } else if (itemSize < childCount) {            for (int i = 0; i < (childCount - itemSize); i++) {                linearLayout.removeViewAt(0);            }        }        for (int i = 0; i < orderList.size(); i++) {            View iView = linearLayout.getChildAt(i);            TextView title = (TextView)      iView.findViewById(R.id.order_title);            TextView message = (TextView) iView.findViewById(R.id.order_message);            title.setText(orderList.get(i).getTitle());            message.setText(orderList.get(i).getMessage());        }    }    static class ViewHolder {        TextView textView;        LinearLayout linearLayout;    }

好了，代码都写完了

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