QQ分组显示列表ExpandableListView组件应用源码
ExpandableListView又称为可扩展的ListView组件，他和ListView组件很相似
不过每行的显示有两个xml文件，一个xml文件用于定义分组列表的显示风格，
还有一个xml文件用于定义分组下面的列表显示风格。如要显示如下图所示的风格
可以用如下代码实现：
public class Friend_manage extends Activity { private static final String GROUP_TEXT = "group_text";// 大组成员Map的key private Relationshipdao instanceRelationshipdao;//该对象用于获取数据源（由于该类涉及到数据库的操作，故没有给出源代码） private List<Map<String, String>> groupData = new ArrayList<Map<String, String>>();// 大组成员 private List<List<User>> childDatalist = new ArrayList<List<User>>();// 小组成员 ExAdapter adapter;//将数据绑定到ExpandableListView组件上 ExpandableListView exList;// 可扩展的ListView @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.friend_manage); instanceRelationshipdao = DaoFactory .getinstanceRelationshipdao(Friend_manage.this); List<User> childrenlist = new ArrayList<User>(); List<Relationship> rel_user_id = null; for (int j = 0; j < 4; j++) { rel_user_id = instanceRelationshipdao.getrelationship( Login.user.getId(), j); childrenlist = getUserbyRelationship(rel_user_id); childDatalist.add(childrenlist); } // 为大小组中添加数据 Map<String, String> curGroupMap1 = new HashMap<String, String>(); Map<String, String> curGroupMap2 = new HashMap<String, String>(); Map<String, String> curGroupMap3 = new HashMap<String, String>(); Map<String, String> curGroupMap4 = new HashMap<String, String>(); curGroupMap1.put(GROUP_TEXT, "朋友(" + childDatalist.get(0).size() + ")"); groupData.add(curGroupMap1); curGroupMap2.put(GROUP_TEXT, "亲人(" + childDatalist.get(1).size() + ")"); groupData.add(curGroupMap2); curGroupMap3.put(GROUP_TEXT, "同学(" + childDatalist.get(2).size() + ")"); groupData.add(curGroupMap3); curGroupMap4 .put(GROUP_TEXT, "陌生人(" + childDatalist.get(3).size() + ")"); groupData.add(curGroupMap4); adapter = new ExAdapter(Friend_manage.this, childDatalist, groupData); exList = (ExpandableListView) findViewById(R.id.list); exList.setAdapter(adapter); exList.setOnChildClickListener(new ExpandableListView.OnChildClickListener() { @Override public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) { // TODO Auto-generated method stub Bundle bundle=new Bundle(); bundle.putSerializable("user1", childDatalist.get(groupPosition).get(childPosition)); Intent intent=new Intent(Friend_manage.this, Friend_type_show.class); intent.putExtras(bundle); Friend_manage.this.startActivity(intent); return false; } }); exList.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View v) { // TODO Auto-generated method stub return false; } }); exList.setGroupIndicator(null);// 不设置大组指示器图标，因为我们自定义设置了 exList.setDivider(null);// 设置图片可拉伸的 } // 根据List<Relationship>获取User表中的字段 public List<User> getUserbyRelationship(List<Relationship> rel_list) { List<User> list = new ArrayList<User>(); Userdao instanceUserdao = DaoFactory .getinstanceUserdao(Friend_manage.this); if(rel_list!=null){ for (int i = 0; i < rel_list.size(); i++) { list.add(instanceUserdao.getUserByid(rel_list.get(i).getUser_id())); } } return list; } // 关键代码是这个可扩展的listView适配器 class ExAdapter extends BaseExpandableListAdapter { private Context context;//该数据成员必不可少
//大小组的数据源可以自定义其数据类型，并不一定就是我这样 private List<List<User>> childdatalist;//小组列表的数据源 private List<Map<String, String>> groupData;//大组列表的数据源 public ExAdapter(Context context, List<List<User>> childdatalist, List<Map<String, String>> groupData) { super(); this.context = context; this.childdatalist = childdatalist; this.groupData = groupData; } // 得到大组成员的view public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { View view = convertView; if (view == null) { LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); view = inflater.inflate(R.layout.member_listview, null);//member_listview.xml文件用于定义GroupView的显示 } TextView title = (TextView) view.findViewById(R.id.content_001); title.setText(getGroup(groupPosition).toString());// 设置大组成员名称 ImageView image = (ImageView) view.findViewById(R.id.ImageView01);// 是否展开大组的箭头图标 if (isExpanded)// 大组展开时 image.setBackgroundResource(R.drawable.uyun_next_n); else // 大组合并时 image.setBackgroundResource(R.drawable.uyun_next_no); return view; } // 得到大组成员的id public long getGroupId(int groupPosition) { return groupPosition; } // 得到大组成员名称 public Object getGroup(int groupPosition) { return groupData.get(groupPosition).get(GROUP_TEXT).toString(); } // 得到大组成员总数 public int getGroupCount() { return groupData.size(); } // 得到小组成员的view public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { View view = convertView; if (view == null) { LayoutInflater inflater = LayoutInflater.from(context); view = inflater.inflate(R.layout.member_childitem, null);//member_childitem.xml文件定义小组列表的显示风格 } final TextView title = (TextView) view .findViewById(R.id.child_text); title.setText(childdatalist.get(groupPosition).get(childPosition) .getName());// 大标题 final TextView title2 = (TextView) view .findViewById(R.id.child_text2); title2.setText(childdatalist.get(groupPosition).get(childPosition) .getInfo());// 小标题 final ImageView seximage=(ImageView)view.findViewById(R.id.child_image); if("男".equals(childdatalist.get(groupPosition).get(childPosition).getSex())){ seximage.setBackgroundResource(R.drawable.friends_man); }else{ seximage.setBackgroundResource(R.drawable.friends_woman); } return view; } // 得到小组成员id public long getChildId(int groupPosition, int childPosition) { return childPosition; } // 得到小组成员的名称 public Object getChild(int groupPosition, int childPosition) { return childdatalist.get(groupPosition).get(childPosition); } // 得到小组成员的数量 public int getChildrenCount(int groupPosition) { return childdatalist.get(groupPosition).size(); } public boolean hasStableIds() { return true; } // 得到小组成员是否被选择 public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } } }
member_listview.xml文件用于定义GroupView的显示，代码如下：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:orientation="horizontal"> <ImageView android:id="@+id/ImageView01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_vertical" android:paddingTop="10dp"> </ImageView> <TextView android:id="@+id/content_001" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_gravity="center_vertical" android:gravity="center_vertical" android:paddingLeft="10dp" android:textColor="#ff0000" android:textSize="30sp" > </TextView> </LinearLayout>
member_childitem.xml文件定义小组列表的显示风格，代码如下：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/childlayout" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal" > <ImageView android:id="@+id/child_image" android:layout_width="50dip" android:layout_height="60dip" android:layout_marginLeft="40dp" android:background="@drawable/friends_man" android:paddingTop="10dp" > </ImageView> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/child_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:gravity="center_vertical" android:text="" android:textColor="#000000" android:textSize="25sp" > </TextView> <TextView android:id="@+id/child_text2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:gravity="center_vertical" android:text="" android:textColor="#000000" android:textSize="20sp" > </TextView> </LinearLayout> </LinearLayout>
