我已经this tutorial创建了ExpandableListAdapter（非常感谢！），用于将产品分组。但是我不得不做一些错误，因为有些产品是错误的组，有些产品是在很多组中，有些产品甚至不可见（显示）。
以下是ExpandableListAdapter以及将数据填入Map<String, List<Product>>（针对产品）和List<String>（针对群组）的代码。
适配器：
class ExpandableListAdapter extends BaseExpandableListAdapter {
private Context _context;
private List<String> _listDataHeader; // header titles
// child data in format of header title, child title
private Map<String, List<Product>> _listDataChild;
private boolean viewOnly;
private Config config;
public ExpandableListAdapter(Context context, List<String> listDataHeader,
Map<String, List<Product>> listChildData, boolean viewOnly, Config config) {
this._context = context;
this._listDataHeader = listDataHeader;
this._listDataChild = listChildData;
this.viewOnly = viewOnly;
this.config = config;
/*
* THIS GIVES ME RIGHT PAIRS (GROUP : PRODUCT)
*
int y = 0;
int i = 1;
for (Entry<String, List<Product>> entry : this._listDataChild.entrySet()) {
String key = entry.getKey();
List<Product> value = entry.getValue();
for(Product valuee : value){
Log.v("PRODUCTS list", i + " GROUP: " + key + " VALUE: " + valuee.getName());
Log.v("GROUPS list", i + " GROUP: " + this._listDataHeader.get(y) + " VALUE: " + valuee.getName());
i++;
}
y++;
}
*/
}
@Override
public Object getChild(int groupPosition, int childPosititon) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.get(childPosititon);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
final Product product = (Product) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.product_item, null);
CheckBox name = (CheckBox) convertView.findViewById(R.id.product_item_checkbox);
TextView price_value = (TextView) convertView.findViewById(R.id.product_item_price_value);
TextView price_value_vo = (TextView) convertView.findViewById(R.id.product_item_price_value_vo);
TextView price_textview = (TextView) convertView.findViewById(R.id.product_item_price_textview);
DatePicker from = (DatePicker) convertView.findViewById(R.id.product_item_datePicker_from);
EditText serial_number = (EditText) convertView.findViewById(R.id.product_item_edittext);
serial_number.addTextChangedListener(new GenericTextWatcherCustom(product));
TextView item_lenght = (TextView) convertView.findViewById(R.id.product_item_lenght);
TextView item_lenght_vo = (TextView) convertView.findViewById(R.id.product_item_lenght_vo);
TextView item_type = (TextView) convertView.findViewById(R.id.product_item_type);
TextView item_type_vo = (TextView) convertView.findViewById(R.id.product_item_type_vo);
TextView name_only = (TextView) convertView.findViewById(R.id.product_item_name);
name.setOnClickListener( new View.OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v ;
Product product = (Product) cb.getTag();
product.setSelected(cb.isChecked());
}
});
DatePicker.OnDateChangedListener mDateListenerFrom = new DatePicker.OnDateChangedListener() {
@Override
public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
Product product = (Product) view.getTag();
@SuppressWarnings("deprecation")
Date date = new Date(year - 1900,monthOfYear,dayOfMonth);
product.setFrom(date);
}
};
Calendar cal = product.getActive_toDate();
if (cal == null){
cal = Calendar.getInstance();
}
Date date = new Date(cal.get(Calendar.YEAR) - 1900,cal.get(Calendar.MONTH),cal.get(Calendar.DAY_OF_MONTH));
from.setMinDate(date.getTime());
from.init(cal.get(Calendar.YEAR),cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH), mDateListenerFrom);
product.setFrom(date);
//quantity.setTag(product);
name.setTag(product);
from.setTag(product);
name.setChecked(product.getSelected());
name.setText(product.getName());
name_only.setText(product.getName());
name_only.setVisibility(8);
item_lenght_vo.setVisibility(8);
item_type_vo.setVisibility(8);
price_value.setText(product.getPrice());
price_value_vo.setText(product.getPrice());
price_value_vo.setVisibility(8);
if (product.getUnit().compareTo("hardware") == 0){
from.setVisibility(DatePicker.INVISIBLE);
serial_number.setVisibility(EditText.VISIBLE);
serial_number.setText(product.getSerial_number());
item_lenght_vo.setText(product.getUnit());
item_lenght.setText(product.getUnit());
item_type.setText("Serial number");
}else{
serial_number.setVisibility(DatePicker.INVISIBLE);
from.setVisibility(EditText.VISIBLE);
if (config.getConfig_change_sales_date().compareTo("0") == 0){
from.setEnabled(false);
}
item_lenght.setText(product.getUnit_length() + " " + product.getUnit());
item_lenght_vo.setText(product.getUnit_length() + " " + product.getUnit());
item_type.setText("Product start");
}
if (viewOnly){
name_only.setVisibility(0);
name.setVisibility(8);
from.setVisibility(8);
serial_number.setVisibility(8);
item_type_vo.setVisibility(0);
item_type.setVisibility(8);
item_lenght.setVisibility(8);
item_lenght_vo.setVisibility(0);
item_lenght_vo.setTextColor(Color.LTGRAY);
price_value.setVisibility(8);
price_value_vo.setVisibility(0);
price_value_vo.setTextColor(Color.LTGRAY);
price_textview.setVisibility(8);
historyButton.setVisibility(8);
// Height adjustment of product box
convertView.setLayoutParams(new ListView.LayoutParams(ListView.LayoutParams.MATCH_PARENT, ListView.LayoutParams.WRAP_CONTENT));
// backButton to the whole width
backButton.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, 1.0f));
// Set the same width
Display display = getWindowManager().getDefaultDisplay();
@SuppressWarnings("deprecation")
int width = display.getWidth();
name_only.measure(MeasureSpec.UNSPECIFIED,MeasureSpec.UNSPECIFIED);
item_lenght_vo.measure(MeasureSpec.UNSPECIFIED,MeasureSpec.UNSPECIFIED);
if(name_only.getMeasuredWidth() < item_lenght_vo.getMeasuredWidth()) {
name_only.setLayoutParams(new RelativeLayout.LayoutParams(item_lenght_vo.getMeasuredWidth(), LayoutParams.WRAP_CONTENT));
}
else {
RelativeLayout.LayoutParams rl = new RelativeLayout.LayoutParams(name_only.getMeasuredWidth(), LayoutParams.WRAP_CONTENT);
rl.addRule(RelativeLayout.BELOW, R.id.product_item_name);
rl.topMargin = 10;
item_lenght_vo.setLayoutParams(rl);
};
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
params.setMargins(70, 0, 0, 0);
params.addRule(RelativeLayout.RIGHT_OF, R.id.product_item_name);
item_type_vo.setLayoutParams(params);
RelativeLayout.LayoutParams params2 = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
params2.setMargins(70, 10, 0, 0);
params2.addRule(RelativeLayout.BELOW, R.id.product_item_name);
params2.addRule(RelativeLayout.RIGHT_OF, R.id.product_item_name);
price_value_vo.setLayoutParams(params2);
};
}
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.size();
}
@Override
public Object getGroup(int groupPosition) {
return this._listDataHeader.get(groupPosition);
}
@Override
public int getGroupCount() {
return this._listDataHeader.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
String headerTitle = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.group_separator, null);
}
TextView group_name = (TextView) convertView.findViewById(R.id.product_group_name);
group_name.setText(headerTitle);//product.getGroup_name());
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
}
填充数据:(没有问题，一切都清晰，效果很好）
public void createProductList(){
Boolean viewOnly = type.compareTo("Product") == 0 ? true : false;
try {
product = products.get(0);
// ArrayList<Map<String,List<Product>> products
// Map<String,List<Product> product
for(Entry<String, List<Product>> entry: product.entrySet()){
String key = entry.getKey();
groups.add(key);
// List<String>
}
} catch (Exception e) {
Log.e("MSG", e.toString());
}
dataAdapter = new ExpandableListAdapter(this,groups,product,viewOnly,config);
// Assign adapter to ListView
productList.setAdapter(dataAdapter);
}
Adapter没问题，运行良好，没有错误异常，只是错误地分组。我不知道出了什么问题。有什么建议吗？
答案 0 :(得分：0)
假设listDataHeader和listChildData正确存储了他们的数据，我会说问题出在你的getChildView()方法上。它相当复杂且难以确定，但看起来您正在执行以下操作：
public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
if (convertView == null) {
//Inflating, setting listeners, filling with data
}
//I don't see anything being done when the convertView is not null?
}
你应该这样做：
public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
if (convertView == null) {
//Inflating
}
//setting listeners, filling with data
}
我可能是错的，你这样做。这篇文章很难说清楚。这是IDE很有用的地方。
旁注，您应该使用ViewHolder范例。它对性能有很大帮助，几乎总是对任何适配器实现都是必须的。这是一个brief run down and example。这是博客文章的底部。