在我的应用中，我有ListView Checkboxes并且有一个扩展BaseAdapter的适配器以填充ListView。列表的基本功能是显示债务，用户可以通过选中框来选择要支付的债务，当用户添加/删除项目时，列表底部的总数会更新。现在，一些债务与另一个债务相关，如果用户检查一个债务，任何其他相关债务也应该被标记，如果您取消债务则应该相同。我还有一个按钮，清除列表中所有选定的债务，以及我的问题所在。
我在ArrayList上记录所选择的债务，它似乎适用于所有程序但是清除按钮。按下按钮时，所选的债务清单似乎总是空的。对可能发生的事情有任何想法吗？
这是我的适配器：
public class ServicesFinancialStatusAdapter extends BaseAdapter implements CompoundButton.OnCheckedChangeListener{
private Context context;
private List<Debts> debtsList;
private List<Debts> selectedDebts;
private LayoutInflater inflater;
private int tabPosition;
private float total;
private OnTotalChangedListener listener;
public ServicesFinancialStatusAdapter(Context context, List<Debts> debtsList, int tabPosition) {
this.context = context;
this.debtsList = debtsList;
this.tabPosition = tabPosition;
this.total = 0;
this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.selectedDebts = new ArrayList<Debts>();
}
@Override
public int getCount() {
return debtsList.size();
}
@Override
public Object getItem(int i) {
return debtsList.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
ViewHolder holder;
if (view == null) {
holder = new ViewHolder();
view = inflater.inflate(R.layout.item_services_financial_status, viewGroup, false);
holder.concept = (TextView) view.findViewById(R.id.payment_concept);
holder.descriptionOrDate = (TextView) view.findViewById(R.id.payment_description_date);
holder.amount = (TextView) view.findViewById(R.id.payment_amount);
holder.expirationDate = (TextView) view.findViewById(R.id.payment_expiration_date);
if (tabPosition > 4) {
holder.checkBox = (CheckBox) view.findViewById(R.id.check_box);
holder.checkBox.setOnCheckedChangeListener(this);
}
view.setTag(holder);
} else
holder = (ViewHolder) view.getTag();
Debts item = debtsList.get(i);
holder.concept.setText(item.getConcept());
holder.amount.setText(item.getAmountToString());
if (item.isExpired())
holder.expirationDate.setText(context.getString(R.string.expired_status_indicator));
else
holder.expirationDate.setText(context.getString(R.string.debts_expiration_date_indicator) + item.getExpirationDate());
if (tabPosition < 3)
holder.descriptionOrDate.setText(item.getDescription());
else if (tabPosition < 5)
holder.descriptionOrDate.setText(item.getDate());
else {
holder.descriptionOrDate.setVisibility(View.GONE);
holder.checkBox.setVisibility(View.VISIBLE);
holder.checkBox.setTag(i);
holder.checkBox.setChecked(item.isSelected());
}
return view;
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
//Get the position of the item clicked and the data object
Integer position = (Integer) buttonView.getTag();
Debts item = debtsList.get(position);
//Change the status ob the object
item.setSelected(isChecked);
for (Debts debts : debtsList) {
//Check on the list for related objects and marks them as well
if (debts.getConceptId() == item.getRelatedDebt())
debts.setSelected(isChecked);
//Get the amount of the debt and add/remove it from
//the selectedDebts list and update the total
float amount = debts.getAmount();
if (debts.isSelected()) {
if (!selectedDebts.contains(debts)) {
selectedDebts.add(debts);
listener.onTotalChanged(addToTotal(amount), selectedDebts);
}
}
else {
if (selectedDebts.contains(debts)) {
selectedDebts.remove(debts);
listener.onTotalChanged(removeFromTotal(amount), selectedDebts);
}
}
}
//Finally update the UI
notifyDataSetChanged();
}
//Anywhere else in the code selectedDebts has the right data but here
//Here the size of the list is always 0
public void unMarkDebts() {
for (Debts debts : debtsList) {
//Get the amount of the debt and remove it from
//the selectedDebts list, set the data object as unselected
//and update the total
float amount = debts.getAmount();
if (selectedDebts.contains(debts)) {
debts.setSelected(false);
selectedDebts.remove(debts);
listener.onTotalChanged(removeFromTotal(amount), selectedDebts);
}
}
//Update the UI
notifyDataSetChanged();
}
private float addToTotal(float value) {
return total += value;
}
private float removeFromTotal(float value) {
return total -=value;
}
public interface OnTotalChangedListener{
public void onTotalChanged(float total, List<Debts> selectedDebts);
}
public void setOnTotalChangedListener(OnTotalChangedListener listener) {
this.listener = listener;
}
private class ViewHolder {
TextView concept, descriptionOrDate, amount, expirationDate;
CheckBox checkBox;
}
}
这是我的片段代码：
public class CheckoutFragment extends BaseFragment implements View.OnClickListener, ServicesFinancialStatusAdapter.OnTotalChangedListener {
public static final String TAG = CheckoutFragment.class.getSimpleName();
private List<Debts> debtsList;
private List<Debts> selectedDebts;
private ServicesFinancialStatusAdapter adapter;
private TextView totalView, positiveBalanceView;
private View noDebtsView, header, footer;
private LinearLayout mainLayout;
private float total, positiveBalance;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
debtsList = new ArrayList<Debts>();
adapter = new ServicesFinancialStatusAdapter(getActivity(), debtsList, 5);
adapter.setOnTotalChangedListener(this);
webServices = ((MainActivity) getActivity()).getNetworkInstance();
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
//Initialize the views
...
reloadData();
onTotalChanged(0, null);
return view;
}
@Override
public void onClick(View view) {
reloadData();
}
@Override
public void onTotalChanged(float total, List<Debts> selectedDebts) {
this.total = total == 0 ? total : total - positiveBalance;
this.selectedDebts = selectedDebts;
totalView.setText(getString(R.string.total_indicator) + Utilities.formatNumberAsMoney(this.total));
getActivity().invalidateOptionsMenu();
}
private void reloadData() {
debtsList.clear();
adapter = new ServicesFinancialStatusAdapter(getActivity(), debtsList, 5);
adapter.setOnTotalChangedListener(this);
loadData();
}
private void loadData() {
//Load debts from server
...
}
private void saveSelectedDebts() {
for (Debts selectedDebt : selectedDebts) {
long id = Debts.insert(getActivity(), selectedDebt);
//Log.d(TAG, "Inserted " + selectedDebt.getConcept() + " with ID " + id);
}
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
if (!((MainActivity) getActivity()).drawerIsOpen) {
inflater.inflate(R.menu.checkout, menu);
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.clear:
adapter.unMarkDebts();
break;
case R.id.checkout:
selectPaymentMode();
break;
}
return super.onOptionsItemSelected(item);
}
private void selectPaymentMode() {
...
}
}
答案 0 :(得分：1)
聊天破了。我认为一项调查可能是：
每当你调用reload时，你都会使用一个新对象从scracth启动适配器，（call method new）。删除该行并使用以前的适配器（负责在onCreate上启动适配器）。请注意，可变的selectedDebts是适配器的本地，并且您没有在构造函数中传递它。