众所周知，Android的listview和expandablelistview会回收它的观点。更多信息：The nuance of android listview。
我已经阅读了文章和信息，例如上面关于如何处理的链接，但他们只给出列表视图上的示例而不是 Expandablelistview （而getView是listview中唯一的方法expandablelistview有getGroupView和getChildView）。
我的可扩展listview的子项已经或需要具有不同的布局，因为这是实现应用程序输出所必需的。
现在，我的问题是如何正确处理可扩展列表视图的回收，这会扩大其子项中不同的布局？比如在我的expandablelistview的getChildView方法中放置 viewHolder 或 convertView 的位置。
我按照下面的代码site来实现一个根据其位置膨胀不同布局的孩子。
每当我点击另一个组时。前一组的子项将其视图重新循环到其默认值，因此不会保留微调器和编辑文本值。我想也许是因为它再次膨胀了观点？
以下是我的 getChildView 方法：
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
//layoutInflater = (LayoutInflater) context.getSystemService(LAYOUT_INFLATER_SERVICE);
//convertView = layoutInflater.inflate(R.layout.expandable_child_layout, parent, false);
try{
int itemType = getChildType(groupPosition, childPosition);
switch(itemType){
case 0:
ViewHolder mainHolder = null;
View v1 = null;
if(v1 == null){
mainHolder = new ViewHolder();
v1 = View.inflate(context, R.layout.newtrip_main, null);
v1.setTag(mainHolder);
mainHolder.tripType = (Spinner) v1.findViewById(R.id.spinTripType);
/*TripTypeAdapter = new ArrayAdapter<String>(NewTrip.this, android.R.layout.simple_spinner_item,getResources().getStringArray(R.array.triptypes)); //selected item will look like a spinner set from XML
TripTypeAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
tripType.setAdapter(TripTypeAdapter);*/
mainHolder.tripType.setOnItemSelectedListener(this);
}//else{
//mainHolder = (ViewHolder) v1.getTag();
//}
return v1;
//break;
case 1:
ViewHolder budgetHolder = null;
View v2 = null;
if(v2 == null){
budgetHolder = new ViewHolder();
v2 = View.inflate(context, R.layout.newtrip_budget, null);
v2.setTag(budgetHolder);
budgetHolder.budget = (Spinner) v2.findViewById(R.id.spinBudget);
budgetHolder.budgetAdapter = new ArrayAdapter<String>(NewTrip.this, android.R.layout.simple_spinner_item,getResources().getStringArray(R.array.budgettype)); //selected item will look like a spinner set from XML
budgetHolder.budgetAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
budgetHolder.budget.setAdapter(budgetHolder.budgetAdapter);
budgetHolder.budget.setOnItemSelectedListener(this);
}
return v2;
//break;
case 2:
ViewHolder foodHolder= null;
View v3 = null;
if(v3 == null){
foodHolder = new ViewHolder();
v3 = View.inflate(context, R.layout.newtrip_food, null);
v3.setTag(foodHolder);
}
return v3;
//break;
case 3:
ViewHolder accomHolder= null;
View v4 = null;
if(v4 == null){
accomHolder = new ViewHolder();
v4 = View.inflate(context, R.layout.newtrip_accommodation, null);
v4.setTag(accomHolder);
accomHolder.accommodation = (Spinner) v4.findViewById(R.id.spinAccommodation);
accomHolder.accommodationAdapter = new ArrayAdapter<String>(NewTrip.this, android.R.layout.simple_spinner_item,getResources().getStringArray(R.array.economicalAccomodation)); //selected item will look like a spinner set from XML
accomHolder.accommodationAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
accomHolder.accommodation.setAdapter(accomHolder.accommodationAdapter);
//return convertView;
}
return v4;
//break;
}
}catch(Exception e){
Toast toast = Toast.makeText(context, e.toString(), Toast.LENGTH_LONG);
toast.show();
}
convertView.invalidate();
return convertView;
}
这是 getGroupView 方法：
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
convertView = View.inflate(context, R.layout.expandable_group_layout, null);
TextView txtView = (TextView) convertView.findViewById(R.id.txt1);
if(groupPosition == 0) {
txtView.setText(" MAIN");
txtView.setTextSize(15f);
}
if(groupPosition == 1) {
txtView.setText(" BUDGET");
txtView.setTextSize(15f);
}
if(groupPosition == 2) {
txtView.setText(" FOOD");
txtView.setTextSize(15f);
}
if(groupPosition == 3) {
txtView.setText(" ACCOMMODATION");
txtView.setTextSize(15f);
}
convertView.invalidate();
return convertView;
}
答案 0 :(得分：0)
这是完全一样的。只需按照与普通getChildView相同的方式处理getView方法即可。因此，对于您的情况，您需要执行以下操作：
@Override
public int getChildType(int groupPosition, int childPosition) {
return groupPosition;
}
@Override
public int getChildTypeCount() {
return getGroupCount();
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
switch (getChildType(groupPosition, childPosition) {
case 1:
ViewHolder vh = null;
if (convertView == null) {
vh = new ViewHolder();
//Inflate your view
convertView.setTag(vh);
} else {
vh = (ViewHolder) convertView.getTag();
}
//Load any data into view
return convertView;
case 2:
//Repeat for all expected types
}
}
答案 1 :(得分：0)
要控制可扩展列表视图中子列表的回收，请确保将更改的数据保存在哈希映射中，以便在向上滚动或解析哈希映射数据时可以跟踪已更改的数据列表，你可以看到结果。
答案 2 :(得分：0)
我遇到了几乎相同的问题，我用这个来解决：https://stackoverflow.com/a/28550013/4342099。
尝试扩展BaseExpandableListAdapter并覆盖getChildTypeCount()和getChildType()