我正在使用可扩展的listView和Expandable ListAdapter。 ChlidView向我展示标题，子视图显示我的子标题。 在“子视图”中，我有一个删除特定行的按钮。 我有两个类，一个用于将数据从数据库加载到hashMap，另一个用于ExpandableListAdapter。我在适配器类上创建onClick方法，并且删除功能正在运行，但列表没有刷新更新的数据。我知道我需要再次将数据加载到hashMap，但是适配器类是在第一个类之外。我正在尝试使用“notifyDataSetChanged”而没有结果。
第1课：
hand = new DbHandler(getActivity());
fullList = new HashMap<ArrayList<ClockModel>, ArrayList<ClockModel>>();
temp = new ArrayList<ClockModel>();
ArrayList<ClockModel> child = new ArrayList<ClockModel>();
child = hand.getDay(workName);
for (int i = 0; i < child.size(); i++) {
if(child.get(i).getDateMonth() == month && child.get(i).getDateYear()==year){
ClockModel m1 = new ClockModel(
child.get(i).getId(),
child.get(i).getWorkName(),
child.get(i).getDateDay(),
child.get(i).getDateMonth(),
);
temp.add(m1);
fullList.put(temp, temp);
}
}
adapter = new ExpandableListCustom(getActivity(), fullList,temp);
lv.setAdapter(adapter);
适配器：
@Override
public View getChildView(final int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
//final String childText = (String) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater)
this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.row_child,null);
}
TextView txMyVal = (TextView) convertView.findViewById(R.id.row_myVal);
TextView txBreakTime = (TextView) convertView.findViewById(R.id.row_breakTime);
TextView txComment = (TextView) convertView.findViewById(R.id.row_comments);
TextView txNameOfDay = (TextView) convertView.findViewById(R.id.row_nameOfDay);
String comments= fullList.get(child).get(groupPosition).getComment();
nameOfDay= fullList.get(child).get(groupPosition).getNameOfDay();
shiftType= fullList.get(child).get(groupPosition).getShiftType();
int breakTime= fullList.get(child).get(groupPosition).getBreakTime();
currentPosition = fullList.get(child).get(groupPosition).getId();
btnRemove = (ImageButton) convertView.findViewById(R.id.row_btnRemove);
btnRemove.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
hand.deleteDay(currentPosition);
Toast.makeText(context, "Del : "+currentPosition, 2000).show();
}
});
public class ExpandableListCustom extends BaseExpandableListAdapter implements OnClickListener {
DbHandler hand;
private Context context;
private HashMap<ArrayList<ClockModel>,ArrayList<ClockModel> > fullList; //Headers
ArrayList<ClockModel> child; //data
MySharedPreferences preferences;
public ExpandableListCustom(Context context,
HashMap<ArrayList<ClockModel>, ArrayList<ClockModel>> fullList,
ArrayList<ClockModel> child) {
super();
this.context = context;
this.fullList = fullList;
this.child = child;
clockSet = new Clock();
preferences = new MySharedPreferences(context);
hand = new DbHandler(context);
}
@Override
public Object getChild(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return this.fullList.get(this.fullList.get(childPosition));
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(final int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
//final String childText = (String) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater)
this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.row_child,null);
}
TextView txMyVal = (TextView) convertView.findViewById(R.id.row_myVal);
TextView txBreakTime = (TextView) convertView.findViewById(R.id.row_breakTime);
TextView txComment = (TextView) convertView.findViewById(R.id.row_comments);
TextView txNameOfDay = (TextView) convertView.findViewById(R.id.row_nameOfDay);
enterHour= (int) fullList.get(child).get(groupPosition).getEnterHour();
exitHour= (int) fullList.get(child).get(groupPosition).getExitHour();
enterMin= (int) fullList.get(child).get(groupPosition).getEnterMin();
exitMin= (int) fullList.get(child).get(groupPosition).getExitMin();
currentPosition = fullList.get(child).get(groupPosition).getId();
btnRemove = (ImageButton) convertView.findViewById(R.id.row_btnRemove);
btnRemove.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
hand.deleteDay(currentPosition);
Toast.makeText(context, "Del : "+currentPosition, 2000).show();
}
});
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
// TODO Auto-generated method stub //////////////////////////////////////////
// return this.fullList.get(groupPosition).size();
if(fullList != null){
return 1;
}else{
return 0;
}
}
@Override
public Object getGroup(int groupPosition) {
// TODO Auto-generated method stub
return this.fullList.get(child).get(groupPosition);
}
@Override
public int getGroupCount() {
if(fullList != null){
return this.fullList.size();
}else{
return 0;
}
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
int dateDay= fullList.get(child).get(groupPosition).getDateDay();
int dateMonth= fullList.get(child).get(groupPosition).getDateMonth();
int dateYear= fullList.get(child).get(groupPosition).getDateYear();
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this.context.getSystemService
(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.row_header, null);
}
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return true;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
}
答案 0 :(得分：0)
现在，当您从数据库中删除该项目时，您需要同时将其从适配器中删除并调用notifyDataSetChanged()：
@Override
public void onClick(View v) {
hand.deleteDay(currentPosition);
fullList.remove(currentPosition);
notifyDataSetChanged();
}
答案 1 :(得分：0)
您需要从数据库中获取数据并分配给arraylist“fullList”，当您删除数据并使用时，它将用于适配器...
notifyDataSetChanged();
适配器的方法......