ANDROID - ExpandableListView [英] ANDROID - ExpandableListView

问题描述

林试图找出如何建立一个包含一个视图（许多）：

Im trying to figure out how to build a view that contains (many of):

• PARENT1（可检查的，可扩展）
• CHILD1（单选按钮）
• CHILD2（单选按钮）

...

• PARENT2（可检查的，可扩展）
• CHILD1（可检查的）
• CHILD2（可检查的）

...

的一点是，家长要成为可检查，并根据孩子有更改图标。 some1可以点我到正确的方向，因为从我发现似乎没有任何工作对我来说。

The point is that parent has to be checkable and based on that children have to change the icon. Can some1 point me into the right direction, because from what i found nothing seems to work for me.

推荐答案

我想，你有你的数据结构以某种方式，如： ArrayList中，其中

I assume, you have your data structured somehow, like: ArrayList where

• 父{名字符串，检查：布尔， 儿童：ArrayList的}和
• 儿童{名：字符串}

• Parent {name:String, checked:boolean, children:ArrayList} and
• Child {name:String}

如果是这样，你只需要做两件事情：

If so, you only have to do two things:

1. 创建适当的布局进行 父项渲染器和子项 渲染
2. 扩大BaseExpandableListAdapter到 建立列表吧。

1. create proper layouts for your parent item renderer and child item renderer
2. expand BaseExpandableListAdapter to build up the list yourself.

下面是关于什么是我心中的小样本：
布局/ grouprow.xml

Here is a small sample about what's in my mind:
layout/grouprow.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:orientation="horizontal"
    android:gravity="fill" android:layout_width="fill_parent"
    android:layout_height="wrap_content" 
    xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- PARENT -->
    <TextView android:id="@+id/parentname" android:paddingLeft="5px"
        android:paddingRight="5px" android:paddingTop="3px"
        android:paddingBottom="3px" android:textStyle="bold" android:textSize="18px"
        android:layout_gravity="fill_horizontal" android:gravity="left"
        android:layout_height="wrap_content" android:layout_width="wrap_content" />
    <CheckBox android:id="@+id/checkbox" android:focusable="false" 
        android:layout_alignParentRight="true" android:freezesText="false"
        android:layout_width="wrap_content" android:layout_height="wrap_content" 
        android:layout_marginTop="5px" />
</RelativeLayout>

布局/ childrow.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent" 
    android:layout_height="wrap_content" android:padding="0px">
    <!-- CHILD -->
    <TextView android:id="@+id/childname" android:paddingLeft="15px" 
        android:paddingRight="5px" android:focusable="false" android:textSize="14px"
        android:layout_marginLeft="10px" android:layout_marginRight="3px" 
        android:layout_width="fill_parent" android:layout_height="wrap_content" />
</LinearLayout>

MyELAdapter类：我已经声明这是一个内部类MyExpandableList的，所以我可以直接到达父母的名单，而不必把它作为参数

MyELAdapter class: I've declared this as an inner class of MyExpandableList, so i could reach the list of parents directly, without having to pass it as parameter.

private class MyELAdapter extends BaseExpandableListAdapter
{
    private LayoutInflater inflater;

    public MyELAdapter()
    {
        inflater = LayoutInflater.from(MyExpandableList.this);
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, 
            View convertView, ViewGroup parentView)
    {
        final Parent parent = parents.get(groupPosition);
        convertView = inflater.inflate(R.layout.grouprow, parentView, false);
        ((TextView) convertView.findViewById(R.id.parentname)).setText(parent.getName());
        CheckBox checkbox = (CheckBox) convertView.findViewById(R.id.checkbox);
        checkbox.setChecked(parent.isChecked());
        checkbox.setOnCheckedChangeListener(new CheckUpdateListener(parent));
        if (parent.isChecked())
            convertView.setBackgroundResource(R.color.red);
        else
            convertView.setBackgroundResource(R.color.blue);
        return convertView;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, 
            View convertView, ViewGroup parentView)
    {
        final Parent parent = parents.get(groupPosition);
        final Child child = parent.getChildren().get(childPosition);
        convertView = inflater.inflate(R.layout.childrow, parentView, false);
        ((TextView) convertView.findViewById(R.id.childname)).setText(child.getName());
        return convertView;
    }

    @Override
    public Object getChild(int groupPosition, int childPosition)
    {
        return parents.get(groupPosition).getChildren().get(childPosition);
    }

    @Override
    public long getChildId(int groupPosition, int childPosition)
    {
        return childPosition;
    }

    @Override
    public int getChildrenCount(int groupPosition)
    {
        return parents.get(groupPosition).getChildren().size();
    }

    @Override
    public Object getGroup(int groupPosition)
    {
        return parents.get(groupPosition);
    }

    @Override
    public int getGroupCount()
    {
        return parents.size();
    }

    @Override
    public long getGroupId(int groupPosition)
    {
        return groupPosition;
    }

    @Override
    public void notifyDataSetChanged()
    {
        super.notifyDataSetChanged();
    }

    @Override
    public boolean isEmpty()
    {
        return ((parents == null) || parents.isEmpty());
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition)
    {
        return true;
    }

    @Override
    public boolean hasStableIds()
    {
        return true;
    }

    @Override
    public boolean areAllItemsEnabled()
    {
        return true;
    }
}

您必须已经有一个公共类 MyExpandableList延伸ExpandableListActivity 里面有一个成员：

You must already have a public class MyExpandableList extends ExpandableListActivity which has a member:

private ArrayList<Parent> parents;

在一个赋值给这个会员/加载家长的名单，你还应该附上您的适配器以这样的观点：

after you assign a value to this member / load the list of parents, you should also attach your adapter to this view:

this.setListAdapter(new MyELAdapter());

，就是这样。你有一个可检查的，可扩展的名单，并在 CheckUpdateListener 的 onCheckedChanged（CompoundButton buttonView，布尔器isChecked）方法，你可以更新你的父对象的选中状态。

and that's it. You have a checkable-expandable list, and in the CheckUpdateListener's onCheckedChanged(CompoundButton buttonView, boolean isChecked) method you can update your parent object's checked state.

请注意，背景色是在getGroupView方法确定，所以您不必在任何地方改变它，如果需要的话只需要调用适配器的 notifyDataSetChanged（）方法。

Note, that the background color is determined in the getGroupView method, so you don't have to change it anywhere, just call the adapter's notifyDataSetChanged() method if needed.

更新

您可以下载示例源$ C ​​$ C从此链接。这是一个Eclipse项目，但如果你使用的是其他开发环境，只是简单的复制所需的源文件（Java + XML）。

you can download the sample source code from this link. It is an eclipse project, but if you are using other developer environment, just simply copy the necessary source files (java + xml).

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