问题:当我点击 Custom/Random 时，什么也没有发生。 (请参阅下面的屏幕截图)。

我使用 this 成功实现了 ExpandListView例如，但在我的例子中，数据来自数据库，这只是区别。我调试我的代码，它进入 expandAll() 并且当我运行应用程序时，它默认带有扩展列表。

我当前代码的屏幕截图，实际上，我在对话框中使用 expandeListview 并使用 expandlistadapter 扩展行

我的代码: ExpandableCategoryAdapter:

public class ExpandableCategoryAdapter extends BaseExpandableListAdapter {
    private static final String TAG = ExpandableCategoryAdapter.class.getSimpleName();
    private static final int TYPE_HEADER = 0;
    private static final int TYPE_ITEM = 1;
    private Context context;
    private List<CategoryHeader> originalList;
    private List<CategoryHeader> headerList;
    private HamburgerMenuListener menuInterface;

    public ExpandableCategoryAdapter(Context context, List<CategoryHeader> generalList, HamburgerMenuListener menuInterface) {
        this.context = context;
        this.headerList = generalList;
        this.originalList = generalList;
        this.menuInterface = menuInterface;
    }

    private boolean isPositionHeader(int position) {
        return position == 0 || position == 6;
    }


    private CategoryHeader getItem(int position) {
        return originalList.get(position);
    }

    private void showLog(String msg) {
        Log.d(TAG, msg);
    }

    @Override
    public int getGroupCount() {
        return headerList.size();
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        List<CustomCategory> countryList = headerList.get(groupPosition).getCategoryList();
        return countryList.size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        return headerList.get(groupPosition);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        List<CustomCategory> countryList = headerList.get(groupPosition).getCategoryList();
        return countryList.get(childPosition);
    }

    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    @Override
    public boolean hasStableIds() {
        return true;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View view, ViewGroup parent) {
        CategoryHeader categoryHeader = (CategoryHeader) getGroup(groupPosition);
        if (view == null) {
            LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = layoutInflater.inflate(R.layout.row_custom_category_list, null);
        }

        TextView heading = view.findViewById(R.id.header_view);
        heading.setText(categoryHeader.getHeaderName().trim());

        return view;
    }

    public void filterData(String query) {

        query = query.toLowerCase();
        headerList.clear();

        if (query.isEmpty()) {
            headerList.addAll(originalList);
        } else {

            for (CategoryHeader categoryHeader : originalList) {

                List<CustomCategory> countryList = categoryHeader.getCategoryList();
                List<CustomCategory> newList = new ArrayList<CustomCategory>();
                for (CustomCategory customCategory : countryList) {
                    if (customCategory.getName().toLowerCase().contains(query)) {
                        newList.add(customCategory);
                    }
                }
                if (newList.size() > 0) {
                    CategoryHeader nContinent = new CategoryHeader(categoryHeader.getHeaderName(), newList);
                    headerList.add(nContinent);
                }
            }
        }

        notifyDataSetChanged();

    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {


        CustomCategory customCategory = (CustomCategory) getChild(groupPosition, childPosition);
        if (convertView == null) {
            LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = layoutInflater.inflate(R.layout.row_general_list, null);
        }

        TextView name = convertView.findViewById(R.id.tv_category_item);


        if (customCategory != null && customCategory.getName() != null) {
            name.setText(customCategory.getName().trim());
        }


        return convertView;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

    public class MyViewHolderItem extends RecyclerView.ViewHolder {
        private TextView textViewItem;
        private ImageView imageViewIcon;
        private ImageView hamburgerMenu;
        private Button customImageViewIcon;

        public MyViewHolderItem(View itemView) {
            super(itemView);
            textViewItem = itemView.findViewById(R.id.tv_category_item);
            imageViewIcon = itemView.findViewById(R.id.iv_category_icon);
            customImageViewIcon = itemView.findViewById(R.id.iv_custom_category_icon);
            hamburgerMenu = itemView.findViewById(R.id.hamburger_menu);

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //          menuInterface.onClickListItem(originalList.get(getAdapterPosition()).getCustCategoryId());
                }
            });

            hamburgerMenu.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if (menuInterface != null) {
                        //          menuInterface.onClickHamburger(originalList.get(getAdapterPosition()).getCustCategoryId());
                    }
                }
            });
        }

    }

    public class MyViewHolderHeader extends RecyclerView.ViewHolder {
        private TextView headerView;

        public MyViewHolderHeader(View itemView) {
            super(itemView);
            headerView = itemView.findViewById(R.id.header_view);
        }
    }
}

类别对话框:

public class CategoryDialog extends BaseClass implements View.OnClickListener, Callback<String>, HamburgerMenuListener, ResultListener, SearchView.OnQueryTextListener, SearchView.OnCloseListener {
    private static final String TAG = CategoryDialog.class.getSimpleName();
    int i = 0;
    private String landlineName, getProviderName, defaultName = "", phoneNum, customCategoryName, selected = "", getConsumerNum, getAccountNum, getOwnerName;
    private long tempId = 0, categoryId, getCustomCategoryId, providerId, customCategoryId = 0, subProviderId;
    private boolean stop = true, insurance, isEditPayment = false, isDeletedSQLite = false, isDeletedServer = false, isClicked = false;
    private ExpandableCategoryAdapter expandableCategoryAdapter;
    private List<CustomCategory> categories, customCategories;
    private RecyclerView dialogRecyclerView;
    private ExpandableListView expandableListView;
    private DatabaseAdapter dbAdapter;
    private Context context;
    private SharedPreferences profilePreference;
    private View promptsView;
    private FloatingActionButton fab;
    private CustomCategory customCategory;
    private List<Reminder> dialogListItems;
    private ImageView info;
    private DialogListAdapter dialogListAdapter;
    private Activity activity;
    private ProviderDialog providerDialog;
    private TextView inputInsuranceProvider, textViewError, inputBillProvider, errorView, information, subProviderError, providerError, customProviderError, consumerError, ownerError;
    private EditText userInput, inputConsumerNumber, name, inputAccountNumber, inputCustomProvider;
    private ProvidersInfo providersInfo;
    private AlertDialog informationDialog, mDialog;
    private CategoryListener categoryListener;
    private General provider, subProvider;
    private RelativeLayout relativeProvider, subProviderLayout, accountLayout, customLayout;
    private LinearLayout spinnerLayout;
    private List<General> mainInsuranceList = new ArrayList<>();
    private CustomSpinnerAdapter spinnerAdapter;
    private CustomSpinnerClass spinInsuranceList;
    private ArrayList<CategoryHeader> headerArrayList = new ArrayList<CategoryHeader>();
    private CategoryHeader categoryHeader;

    public CategoryDialog(Context context, Activity activity) {
        super(context, activity);
        this.activity = activity;
        this.context = context;
    }

    private void init() {
        categories = new ArrayList<>();
        customCategories = new ArrayList<>();
        dbAdapter = RemindMe.getInstance().adapter;
        dialogListItems = new ArrayList<>();
        profilePreference = context.getSharedPreferences(PROFILE, MODE_PRIVATE);
        providerDialog = new ProviderDialog(context);
        providerDialog.setResultListener(this);
        getDataFromSharedPref();
    }

    private void loadSomeData() {
        categoryHeader = new CategoryHeader("Custom", customCategories);
        headerArrayList.add(categoryHeader);

        categoryHeader = new CategoryHeader("Random", categories);
        headerArrayList.add(categoryHeader);

        categoryHeader = new CategoryHeader("General", categories);
        headerArrayList.add(categoryHeader);
    }

    public void setCategoryListener(CategoryListener listener) {
        this.categoryListener = listener;
    }

    private void setClickListener() {
        fab.setOnClickListener(this);
    }

    public void showCategoryDialog() {
        LayoutInflater li = LayoutInflater.from(context);
        promptsView = li.inflate(R.layout.row_category_dialog_layout, null);
        init();
        findViewById();
        setClickListener();
        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
        alertDialogBuilder.setView(promptsView);

        alertDialogBuilder.setNegativeButton(context.getString(R.string.cancel), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });

        recyclerView();
        mDialog = alertDialogBuilder.create();
        mDialog.setCancelable(false);

        mDialog.getWindow().setBackgroundDrawableResource(R.color.colorWhite);
        mDialog.show();
    }

    private void findViewById() {
        expandableListView = promptsView.findViewById(R.id.expandableList);
        fab = promptsView.findViewById(R.id.fab);
    }

    private void recyclerView() {
        addToCategories();
        loadSomeData();
        showLog("headerArrayList: " + headerArrayList.size());
        //expandableCategoryAdapter = new ExpandableCategoryAdapter(context, categories, this);
        expandableCategoryAdapter = new ExpandableCategoryAdapter(context, headerArrayList, this);
        //       expandableListView.setHasFixedSize(true);
       /* final LinearLayoutManager mLayoutManager;
        mLayoutManager = new LinearLayoutManager(context);
        expandableListView.setLayoutManager(mLayoutManager);
        expandableListView.setItemAnimator(new DefaultItemAnimator());*/
        try {
            expandableListView.setAdapter(expandableCategoryAdapter);
        } catch (Exception exp) {
            exp.printStackTrace();
        }
        showLog("1");
        expandAll();
      listener();
    //      expandableCategoryAdapter.notifyDataSetChanged();
    //     expandableCategoryAdapter.refresh(headerArrayList);
}

private void listener() {
    expandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
        @Override
        public void onGroupExpand(int groupPosition) {
            for (int i = 0; i < headerArrayList.size(); i++) {
                if (i != groupPosition) {
                    expandableListView.expandGroup(i);
                }

            }
        }
    });
}private void expandAll() {
        showLog("2");
        int count = expandableCategoryAdapter.getGroupCount();
        showLog("3 :"+ count);
        for (int i = 0; i < count; i++) {
            showLog("4");
            expandableListView.expandGroup(i);
        }
    }

最佳答案

public class Class******Adapter extends BaseExpandableListAdapter
{
private Context context;
private List<ModelClassObj> ModelClassObjs;

public ExpandableVocherDetailsAdapter(Context context,List<ModelClassObj> 
ModelClassObjs)
{
this.context = context;
this.ModelClassObjs = ModelClassObjs;
}

public void refresh(List<ModelClassObj> ModelClassObjs)
{
    this.ModelClassObjs   = ModelClassObjs;
    notifyDataSetChanged();
}


@Override
public boolean isChildSelectable(int i, int i1) {
    return false;
}

@Override
public boolean hasStableIds() {
    return false;
}

@Override
public Object getChild(int i, int i1) {
    return null;
}

@Override
public long getGroupId(int i) {
    return 0;
}

@Override
public Object getGroup(int i) {
    return null;
}

@Override
public long getChildId(int i, int i1) {
    return 0;
}

@Override
public int getChildrenCount(int i) {
    return 1;
}

@Override
public int getGroupCount() {
    if(ModelClassObjs!=null && ModelClassObjs.size()>0)
        return ModelClassObjs.size();
    return 0;
}

@Override
public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup)
{
    ModelClassObj  obj  = ModelClassObjs.get(i);

    EditText tvCreatedBy,tvCreatedOn,tvDescription,tvVoucherNumber,tvcancelReason,tvcancelBy,tvCancelApproveBy,tvCancelApproveOn,tvdocph,tvdocemail;
    LinearLayout tvCancelReasonHed,lldocph_email,llcancel_appro;

    view  =  LayoutInflater.from(context).inflate(R.layout.exp_vocher_child,null);

    tvCreatedBy     = view.findViewById(R.id.tvCreatedBy);

    tvCreatedBy.setText(obj.getCreatedBy());

    return view;
}

@Override
public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup)
{
    final ModelClassObj  obj  = ModelClassObjs.get(i);

    TextView tvDoctorName,tvvpAmnt,tv_vp_payment,tv_vp_ReceipientType;
    ImageView ivIndicator;
    LinearLayout llParent;

    view = 
LayoutInflater.from(context).inflate(R.layout.exp_vocher_parent_cell,null);

    tvDoctorName             = view.findViewById(R.id.tvDoctorName);


    tvDoctorName.setText(obj.getDoctorName());

    if(b==true)
        ivIndicator.setImageResource(R.drawable.up);
    else
        ivIndicator.setImageResource(R.drawable.down);

    return view;
}
}

Activity 类

expandableLisView.setOnGroupExpandListener(new 
ExpandableListView.OnGroupExpandListener() {
        @Override
        public void onGroupExpand(int groupPosition) {
            for (int i = 0; i < voucherDetailsObjs.size(); i++) {
                if (i != groupPosition) {
                    exlvVocherDetail.collapseGroup(i);
                }
            }
        }
    });

关于android - 列表没有第二次展开/折叠，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56881534/