Android支持展開和收縮功能的列表控件

1、567891112131415161718192021最近在做一個Rss閱讀器，看了下別人做的閱讀器 中的列表控件可以展開、收縮，我就在網(wǎng)上搜索了一 下。下面就我找到的一個小例子，給大家分享一下。ActivityMain .java1 .android;mportandroid.app.ExpandableListActivity;mportandroid.os.Bundle;mportandroid.view.ContextMenu;mportandroid.View.MenuItem;mportandroid.view.View;mportandroid.view.ContextMenu.

2、ContextMenuInfo;mportandroid.widget.ExpandableListAdapter;mportandroid.widget.ExpandableListView;10 importandroid.widget.TextView;importandroid.widget.Toast;importandroid.widget.ExpandableListView.ExpandableListContextMenuInfo; publicclassActivityMain extendsExpandableListActivity privateExpandableL

3、istAdaptermAdapter;OverridepublicvoidonCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);this.setTitle(ExpandableList);mAdapter = newMyExpandableListAdapter(this);setListAdapter(mAdapter);registerForContextMenu(this.getExpandableListView();22232425262728293031323334353637383940414

4、2434445464748為列表的每一項創(chuàng)建上下文菜單（即長按后呼出的菜單）menu, View v,ontextMenuInfomenuInfo) .add(0, 0, 0, ContextMenu);單擊上下文菜單后的邏輯publicbooleanonContextItemSelected(MenuItem item) ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo)temgetMenuInfo();=(TextView) info.targetView).getText().toString();nt

5、type = ExpandableListViewgetPackedPositionType(info.packedPosition);f(type = ExpandableListView.PACKED_POSITION_TYPE_CHILD) ntgroupPos = ExpandableListViewgetPackedPositionGroup(info.packedPosition);ntchildPos = ExpandableListViewgetPackedPositionChild(info.packedPosition);his,itle + -Group Index+ g

6、roupPos + Child Index: 卜 childPos, Toast.LENGTH_SHORT).show(); eturntrue;49 50515253545556575859601returnfalse;MyExpandableListAdapter.java1234567891011.android;importandroid.content.Context;importandroid.view.Gravity;importandroid.View.View;importandroid.view.ViewGroup;importandroid.widget.AbsListV

7、iew;importandroid.widget.BaseExpandableListAdapter;importandroid.widget.TextView;publicclassMyExpandableListAdapter extendsBaseExpandableListAdapter privateContext mContext;/父列表數(shù)據(jù) 12 privateString口 groups = group1, group2, group3, group4,13141516171819202122232425262728293031323334353637383940；/子列表數(shù)

8、據(jù)privatestring口 children = child1, child1, child2, child1, child2, child3, child1, child2, child3, child4, ;MyExpandableListAdapter(Context context) mContext = context;OverridepublicObject getChild(intgroupPosition, intchildPosition) / TODO Auto-generated method stubreturnchildrengroupPositionchildP

9、osition;OverridepubliclonggetChildId(intgroupPosition, intchildPosition) / TODO Auto-generated method stub returnchildPosition;/取子列表中的某一項的viewOverridepublicView getChildView(intgroupPosition, intchildPosition, booleanisLastChild, View convertView, ViewGroup parent) TextViewtextView = getGenericView(

10、);；textView.setText(getChild(groupPosition, childPosition).toString(); returntextView;OverridepublicintgetChildrenCount(intgroupPosition) / TODO Auto-generated method stubreturnchildrengroupPosition.length;OverridepublicObject getGroup(intgroupPosition) returngroupsgroupPosition;Overridepublicintget

11、GroupCount() / TODO Auto-generated method stubreturngroups.length;OverridepubliclonggetGroupld(intgroupPosition) / TODO Auto-generated method stubreturngroupPosition;OverridepublicView getGroupView(intgroupPosition, booleanisExpanded,View convertView, ViewGroup parent) TextViewtextView = getGenericV

12、iew();textView.setText(getGroup(groupPosition).toString();returntextView;OverridepublicbooleanhasStableIds() 41424344454647484950515253545556575859606162636465666768/ TODO Auto-generated method stubRQ697071727374757677787980818283848586878889909192939495returntrue;OverridepublicbooleanisChildSelecta

13、ble(intgroupPosition, intchildPosition) / TODO Auto-generated method stub returntrue;/獲取某一項的view的邏輯 privateTextViewgetGenericView() AbsListView.LayoutParamsIp = newAbsListView.LayoutParams( ViewGroup.LayoutParams.FILL_PARENT, 48);TextViewtextView = newTextView(mContext);textView.setLayoutParams(lp);textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEF