ExpandableListView / ExpandableListActivity的运用及数据更新

ExpandableListView / ExpandableListActivity的使用及数据更新

ExpandableListView / ExpandableListActivity

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?二者关系 和 ListActivity / ListView 是一样的

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[代码 步骤]

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1. 定义含有ExpandableListView 的布局：main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"android:id="@+id/layout"><ExpandableListViewandroid:id="@+id/expandList"android:layout_width="fill_parent"android:layout_height="wrap_content"/></LinearLayout>

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2.? 定义数据结构List<String>, List<List<String>> 分别用于存放 Group / Children 的String

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List<String> group;List<List<String>> child;

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3. 初始化 List<String> List<List<String>>? 并插入一些数据

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public void initialData(){group = new ArrayList<String>();child = new ArrayList<List<String>>();addInfo("griffinshi", new String[]{"13776117119","man","Jiangsu"});addInfo("lancewu",new String[]{"1321134","man","Taiwan"});addInfo("kandyli",new String[]{"12345"});}public void addInfo(String p,String[] c){group.add(p);List<String> item = new ArrayList<String>();for(int i=0;i<c.length;i++){item.add(c[i]);}child.add(item);}

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3. 定义BaseExpandableListAdapter 并与List<String> List<List<String>> 数据相适配

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public class InfoDetailsAdapter extends BaseExpandableListAdapter {Activity activity;public InfoDetailsAdapter(Activity a){activity = a;}//child method stub@Overridepublic Object getChild(int groupPosition, int childPosition) {// TODO Auto-generated method stubreturn child.get(groupPosition).get(childPosition);}@Overridepublic long getChildId(int groupPosition, int childPosition) {// TODO Auto-generated method stubreturn childPosition;}@Overridepublic int getChildrenCount(int groupPosition) {// TODO Auto-generated method stubreturn child.get(groupPosition).size();}@Overridepublic View getChildView(int groupPosition, int childPosition,boolean isLastChild, View convertView, ViewGroup parent) {// TODO Auto-generated method stubString string = child.get(groupPosition).get(childPosition);return getGenericView(string);}//group method stub@Overridepublic Object getGroup(int groupPosition) {// TODO Auto-generated method stubreturn group.get(groupPosition);}@Overridepublic int getGroupCount() {// TODO Auto-generated method stubreturn group.size();}@Overridepublic long getGroupId(int groupPosition) {// TODO Auto-generated method stubreturn groupPosition;}@Overridepublic View getGroupView(int groupPosition, boolean isExpanded,View convertView, ViewGroup parent) {// TODO Auto-generated method stubString string = group.get(groupPosition);return getGenericView(string);}//View stub to create Group/Children 's Viewpublic TextView getGenericView(String s) {// Layout parameters for the ExpandableListViewAbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, 64);TextView text = new TextView(activity);text.setLayoutParams(lp);// Center the text verticallytext.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);// Set the text starting positiontext.setPadding(36, 0, 0, 0);text.setText(s);return text;}@Overridepublic boolean hasStableIds() {// TODO Auto-generated method stubreturn false;}@Overridepublic boolean isChildSelectable(int groupPosition, int childPosition) {// TODO Auto-generated method stubreturn true;}}

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4. emulator 运行截图：

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5. 下面说一下 数据更新 问题 包括：添加数据 删除数据

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* 定义添加数据界面：add.xml

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<?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="fill_parent"><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="horizontal"android:layout_width="wrap_content"android:layout_height="wrap_content"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="姓名:"/><EditTextandroid:id="@+id/add_name"android:layout_width="200dip"android:layout_height="wrap_content"/></LinearLayout><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="horizontal"android:layout_width="wrap_content"android:layout_height="wrap_content"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="电话:"/><EditTextandroid:id="@+id/add_phone"android:layout_width="200dip"android:layout_height="wrap_content"/></LinearLayout><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="horizontal"android:layout_width="wrap_content"android:layout_height="wrap_content"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="性别:"/><EditTextandroid:id="@+id/add_sex"android:layout_width="200dip"android:layout_height="wrap_content"/></LinearLayout><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="horizontal"android:layout_width="wrap_content"android:layout_height="wrap_content"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="住址:"/><EditTextandroid:id="@+id/add_home"android:layout_width="200dip"android:layout_height="wrap_content"/></LinearLayout><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="horizontal"android:layout_width="wrap_content"android:layout_height="wrap_content"><Buttonandroid:id="@+id/add_ok"android:layout_width="90dip"android:layout_height="wrap_content"android:text="OK"/><Buttonandroid:id="@+id/add_no"android:layout_width="90dip"android:layout_height="wrap_content"android:text="NO"/></LinearLayout></LinearLayout>

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* add.xml 里 View 的定义：

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public void createDialogAdd(){viewAdd = this.getLayoutInflater().inflate(R.layout.add, null);dialogAdd = new Dialog(this);dialogAdd.setContentView(viewAdd);dialogAdd.setTitle("输入新成员信息");add_name = (EditText)viewAdd.findViewById(R.id.add_name);add_phone = (EditText)viewAdd.findViewById(R.id.add_phone);add_sex = (EditText)viewAdd.findViewById(R.id.add_sex);add_home = (EditText)viewAdd.findViewById(R.id.add_home);add_ok = (Button)viewAdd.findViewById(R.id.add_ok);add_no = (Button)viewAdd.findViewById(R.id.add_no);add_ok.setOnClickListener(new OnClickListener(){public void onClick(View v) {// TODO Auto-generated method stubString[] data = {add_phone.getText().toString(),add_sex.getText().toString(),add_home.getText().toString()};addInfo(add_name.getText().toString(),data);dialogAdd.dismiss();mAdapter.notifyDataSetChanged();}});add_no.setOnClickListener(new OnClickListener(){public void onClick(View v) {// TODO Auto-generated method stubdialogAdd.dismiss();}});}

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* 运行截图：

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* 定义删除数据界面：delete.xml

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<?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="fill_parent"><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="horizontal"android:layout_width="wrap_content"android:layout_height="wrap_content"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="ID:"/><EditTextandroid:id="@+id/delete_id"android:layout_width="200dip"android:layout_height="wrap_content"/></LinearLayout><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="horizontal"android:layout_width="wrap_content"android:layout_height="wrap_content"><Buttonandroid:id="@+id/delete_ok"android:layout_width="90dip"android:layout_height="wrap_content"android:text="OK"/><Buttonandroid:id="@+id/delete_no"android:layout_width="90dip"android:layout_height="wrap_content"android:text="NO"/></LinearLayout></LinearLayout>

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* delete.xml 里View 定义：

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public void createDialogDelete(){viewDelete = this.getLayoutInflater().inflate(R.layout.delete, null);dialogDelete = new Dialog(this);dialogDelete.setContentView(viewDelete);dialogDelete.setTitle("删除指定成员");delete_id = (EditText)viewDelete.findViewById(R.id.delete_id);delete_ok = (Button)viewDelete.findViewById(R.id.delete_ok);delete_no = (Button)viewDelete.findViewById(R.id.delete_no);delete_ok.setOnClickListener(new OnClickListener(){public void onClick(View v) {// TODO Auto-generated method stubString id = delete_id.getText().toString();if(! id.equals("")){int i = Integer.parseInt(id);group.remove(i);child.remove(i);dialogDelete.dismiss();mAdapter.notifyDataSetChanged();}}});delete_no.setOnClickListener(new OnClickListener(){public void onClick(View v) {// TODO Auto-generated method stubdialogDelete.dismiss();}});}

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* 运行截图：

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最后 说一下ExpandableListView的回调函数 用于监听那个id 被expand

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expandList.setOnGroupClickListener(new?OnGroupClickListener(){ ?? ?? ????????????@Override?? ????????????public?boolean?onGroupClick(ExpandableListView?arg0,?View?arg1, ?? ????????????????????int?arg2,?long?arg3)?{ ?? ????????????????//?TODO?Auto-generated?method?stub ?? ????????????????Toast.makeText(activity,"[Group?Click]:"+arg2,Toast.LENGTH_LONG).show(); ?? ???????????????? ?? ????????????????return?false; ?? ????????????} ?? ???????????? ?? ????????}); ?? ???????? ?? ????????expandList.setOnChildClickListener(new?OnChildClickListener(){ ?? ?? ????????????@Override?? ????????????public?boolean?onChildClick(ExpandableListView?arg0,?View?arg1, ?? ????????????????????int?arg2,?int?arg3,?long?arg4)?{ ?? ????????????????//?TODO?Auto-generated?method?stub ?? ????????????????Toast.makeText(activity,"[Child?Click]:"+arg2+":"+arg3,Toast.LENGTH_LONG).show(); ?? ???????????????? ?? ????????????????return?false; ?? ????????????} ?? ???????????? ?? ????????});??

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