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android 手風琴

先看效果,過瘾一番。

源碼下載下傳:http://files.cnblogs.com/salam/WidgetDemo.rar

  

  ExpandableListView是Android中的手風琴,本人感覺效果相當棒。

  一、ExpandableListView介紹

    一個垂直滾動的顯示兩個級别(Child,Group)清單項的視圖,清單項來自ExpandableListAdapter 。組可以單獨展開。

  1.重要方法

      expandGroup(int groupPos) :在分組清單視圖中展開一組,

      setSelectedGroup(int groupPosition) :設定選擇指定的組。

      setSelectedChild(int groupPosition, int childPosition, boolean shouldExpandGroup) :設定選擇指定的子項。

      getPackedPositionGroup(long packedPosition) :傳回所選擇的組

      getPackedPositionForChild(int groupPosition, int childPosition) :傳回所選擇的子項

      getPackedPositionType(long packedPosition) :傳回所選擇項的類型(Child,Group)

      isGroupExpanded(int groupPosition) :判斷此組是否展開

  2.代碼:

ExpandableListContextMenuInfo menuInfo=(ExpandableListContextMenuInfo)item.getMenuInfo();

String title=((TextView)menuInfo.targetView).getText().toString();

int type=ExpandableListView.getPackedPositionType(menuInfo.packedPosition);

if (type==ExpandableListView.PACKED_POSITION_TYPE_CHILD) {

int groupPos =ExpandableListView.getPackedPositionGroup(menuInfo.packedPosition);

int childPos =ExpandableListView.getPackedPositionChild(menuInfo.packedPosition);

二、ExpandableListAdapter

    一個接口,将基礎資料連結到一個ExpandableListView。此接口的實施将提供通路Child的資料(由組分類),并執行個體化的Child和Group。

    getChildId(int groupPosition, int childPosition) 擷取與在給定組給予孩子相關的資料。

    getChildrenCount(int groupPosition) 傳回在指定Group的Child數目。

  2.代碼

public class MyExpandableListAdapter extends BaseExpandableListAdapter {

// Sample data set. children[i] contains the children (String[]) for groups[i].

public String[] groups = { "我的好友", "新疆同學", "親戚", "同僚" };

public String[][] children = {

{ "胡算林", "張俊峰", "王志軍", "二人" },

{ "李秀婷", "蔡喬", "别高", "餘音" },

{ "攤派新", "張愛明" },

{ "馬超", "司道光" }

};

public Object getChild(int groupPosition, int childPosition) {

return children[groupPosition][childPosition];

}

public long getChildId(int groupPosition, int childPosition) {

return childPosition;

public int getChildrenCount(int groupPosition) {

return children[groupPosition].length;

public TextView getGenericView() {

// Layout parameters for the ExpandableListView

AbsListView.LayoutParams lp = new AbsListView.LayoutParams(

ViewGroup.LayoutParams.MATCH_PARENT, 64);

TextView textView = new TextView(ExpandableListDemo.this);

textView.setLayoutParams(lp);

// Center the text vertically

textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);

// Set the text starting position

textView.setPadding(36, 0, 0, 0);

return textView;

public View getChildView(int groupPosition, int childPosition, boolean isLastChild,

View convertView, ViewGroup parent) {

TextView textView = getGenericView();

textView.setText(getChild(groupPosition, childPosition).toString());

public Object getGroup(int groupPosition) {

return groups[groupPosition];

public int getGroupCount() {

return groups.length;

public long getGroupId(int groupPosition) {

return groupPosition;

public View getGroupView(int groupPosition, boolean isExpanded, View convertView,

ViewGroup parent) {

textView.setText(getGroup(groupPosition).toString());

public boolean isChildSelectable(int groupPosition, int childPosition) {

return true;

public boolean hasStableIds() {

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