android 适配器Adpter的使用总结 之 BaseExpandableListAdapter

转载请标明出处：http://www.cnblogs.com/tanlon/archive/2011/06/20/2085583.html

通过前面三篇文章:

Android 适配器Adapter的学习:http://www.cnblogs.com/tanlon/archive/2011/05/21/2053009.html

Android 适配器Adpter的使用总结:http://www.cnblogs.com/tanlon/archive/2011/06/20/2084901.html

Android 适配器Adpter的使用总结 之 CursorAdpter：http://www.cnblogs.com/tanlon/archive/2011/06/20/2085562.html

我们对Adpter有了较深的理解之后，我们来了解一下BaseExpandableListAdapter也就是二级树ExpandableListView的数据填充器。

我们应该先了解一下关于BaseExpandableListAdapter中的一些方法的含义和用法：

http://www.cnblogs.com/over140/archive/2011/01/18/1937921.html

如我的上篇博文<Android 适配器Adpter的使用总结 之 CursorAdpter>提到的BaseExpandableListAdapter则是实现了ExpandableListAdpter、HeterogeneousExpandableList接口，同理CursorTreeAdapter继承了BaseExpandableListAdapter，并且衍生出了ResourceCusorTreeAdapter，由ResourceCusorTreeAdapter又衍生出了SimpleCursorTreeAdapter。除此之外还有SimpleExpandableListAdapter也是继承自BaseExpandableListAdapter.

在这里还是以SimpleExpandableListAdapter为例，做一个小demo：

布局文件：

<?xml version="1.0" encoding="utf-8"?><LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent">   <ExpandableListView android:layout_height="fill_parent"    android:layout_width="fill_parent" android:id="@+id/expandableListView"/></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:gravity="center"><TextViewandroid:id="@+id/expandablelistview_tv"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_alignParentRight="true"android:text="expandablelistview_tv"android:layout_centerVertical="true"android:paddingLeft="50dp"android:textSize="24dp"/></RelativeLayout>

数据填充器：

public class ListSimpleExpandableListAdapter extends SimpleExpandableListAdapter{    private Context context;    private List<Map<String, String>> groupData = new ArrayList<Map<String, String>>();//装载group数据    private List<List<Map<String, String>>> childData = new ArrayList<List<Map<String, String>>>();//装载child数据    private int expandedGroupLayout;    private int collapsedGroupLayout;     private String[] groupFrom;    private int[] groupTo;    private int childLayout;    private int lastChildLayout;    private String[] childFrom;    private int[] childTo;    //构造器    public ListSimpleExpandableListAdapter(Context context,            List<Map<String, String>> groupData, int expandedGroupLayout,            int collapsedGroupLayout, String[] groupFrom, int[] groupTo,            List<List<Map<String, String>>> childData,            int childLayout, int lastChildLayout, String[] childFrom,            int[] childTo) {        super(context, groupData, expandedGroupLayout, collapsedGroupLayout, groupFrom,                groupTo, childData, childLayout, lastChildLayout, childFrom, childTo);        // TODO Auto-generated constructor stub        this.context=context;        this.groupData=groupData;        this.childData=childData;        this.expandedGroupLayout=expandedGroupLayout;        this.collapsedGroupLayout=collapsedGroupLayout;        this.groupFrom=groupFrom;        this.groupTo=groupTo;        this.childLayout=childLayout;        this.lastChildLayout=lastChildLayout;        this.childFrom=childFrom;        this.childTo=childTo;                }    //获取group对象    @Override    public Object getGroup(int groupPosition) {        // TODO Auto-generated method stub        return groupData;    }    //获取group对象的数量    @Override    public int getGroupCount() {        // TODO Auto-generated method stub        return groupData.size();    }    //获取group的id    @Override    public long getGroupId(int groupPosition) {        // TODO Auto-generated method stub        return groupPosition;    }    @Override    public View getGroupView(int groupPosition, boolean isExpanded,            View convertView, ViewGroup parent) {        // TODO Auto-generated method stub        GroupHolder groupHolder;        if(convertView==null){            convertView=LayoutInflater.from(context).inflate(expandedGroupLayout, null);            groupHolder=new GroupHolder();//            groupHolder.imageView=(ImageView) convertView.findViewById(R.id.expandablelistview_iv);            groupHolder.textView=(TextView) convertView.findViewById(R.id.expandablelistview_tv);            convertView.setTag(groupHolder);        }else{            groupHolder=(GroupHolder) convertView.getTag();        }//        groupHolder.imageView.setImageResource(Integer.parseInt(groupData.get(groupPosition).get(groupFrom[0]).toString()));        groupHolder.textView.setText(groupData.get(groupPosition).get(groupFrom[1]).toString());        return convertView;    }    //子节点是否被选中    @Override    public boolean isChildSelectable(int groupPosition, int childPosition) {        // TODO Auto-generated method stub        return true;    }    //获取子节点的数量    @Override    public int getChildrenCount(int groupPosition) {        // TODO Auto-generated method stub        return childData.get(groupPosition).size();    }    //获取子节点对象    @Override    public Object getChild(int groupPosition, int childPosition) {        // TODO Auto-generated method stub        return childData.get(groupPosition).get(childPosition);    }    //获取子节点id    @Override    public long getChildId(int groupPosition, int childPosition) {        // TODO Auto-generated method stub        return childPosition;    }    @Override    public View getChildView(int groupPosition, int childPosition,            boolean isLastChild, View convertView, ViewGroup parent) {        // TODO Auto-generated method stub        ChildHolder childHolder;        if(convertView==null){            convertView=LayoutInflater.from(context).inflate(childLayout, null);            childHolder=new ChildHolder();            childHolder.imageView=(ImageView) convertView.findViewById(R.id.listitem_pic);            childHolder.title=(TextView) convertView.findViewById(R.id.listitem_title);            childHolder.content=(TextView) convertView.findViewById(R.id.listitem_content);            convertView.setTag(childHolder);        }else{            childHolder=(ChildHolder) convertView.getTag();        }        childHolder.imageView.setImageResource(Integer.parseInt(childData.get(groupPosition).get(childPosition).get(childFrom[0]).toString()));        childHolder.title.setText(childData.get(groupPosition).get(childPosition).get(childFrom[1]).toString());        childHolder.content.setText(childData.get(groupPosition).get(childPosition).get(childFrom[2]).toString());        return convertView;    }    class GroupHolder{        ImageView imageView;        TextView textView;    }        class ChildHolder{        ImageView imageView;        TextView title;        TextView content;    }}

public class ListSimpleExpandableList extends Activity{    private static final String ICON="ICON";    private static final String NAME = "NAME";    private static final String IS_EVEN = "IS_EVEN";            private ExpandableListAdapter mAdapter;    private ExpandableListView expandableListView;    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);                setContentView(R.layout.groupexpandablelist);        List<Map<String, String>> groupData = new ArrayList<Map<String, String>>();        List<List<Map<String, String>>> childData = new ArrayList<List<Map<String, String>>>();        for (int i = 0; i < 20; i++) {            Map<String, String> curGroupMap = new HashMap<String, String>();            groupData.add(curGroupMap);            curGroupMap.put(ICON, String.valueOf(R.drawable.icon));            curGroupMap.put(NAME, "Group " + i);            curGroupMap.put(IS_EVEN, (i % 2 == 0) ? "This group is even" : "This group is odd");                        List<Map<String, String>> children = new ArrayList<Map<String, String>>();            for (int j = 0; j < 15; j++) {                Map<String, String> curChildMap = new HashMap<String, String>();                curChildMap.put(ICON, String.valueOf(R.drawable.icon));                curChildMap.put(NAME, "Child " + j);                curChildMap.put(IS_EVEN, (j % 2 == 0) ? "This child is even" : "This child is odd");                children.add(curChildMap);            }            childData.add(children);        }        expandableListView=(ExpandableListView) findViewById(R.id.expandableListView);        mAdapter=new ListSimpleExpandableListAdapter(this, groupData, R.layout.groupexpandablelist_item, 0, new String[] { ICON ,NAME, IS_EVEN }, null, childData, R.layout.listsimple_item, 0,  new String[] { ICON ,NAME, IS_EVEN }, null);        expandableListView.setAdapter(mAdapter);        //传入null则是消除箭头，如果想替换成自己的图标则传入一个drawable即可//        this.expandableListView.setGroupIndicator(null);    }    }

有什么不对的地方还望大牛多多指教！相关代码发布在QQ群：Android中高级技术免费培训QQ群(118949422)很晚了，睡觉去了，明天有机会再写。