ExpandableListAdapter删除组问题
ExpandableListAdapter delete group problem
我在从 ExpandableListView 中删除组时遇到了很大的问题。即使在 google 很多次并尝试了很多教程和示例之后，我也无法解决它。
虽然我有很多编程经验，但我对 Android 编程比较了解。所以我确信源代码中有很多事情还没有做好。但截至目前，我想在从列表中删除一个组后以错误的观点关注问题。
为了更好地概述问题，这里有一些屏幕截图
应用程序启动
单击“列出所有预算”按钮后列出
所有组扩展
在删除最后一组child之前
剩余组显示child人两次
这次最后一组有两个children
删除最后一组children之前
删除最后一组child后的正确结果
我希望问题变得清楚。如果最后一个组只有一个 child 并且这个被删除，则整个组将被应用程序删除 - 但第一组的 children 会出现两次。
在调试的过程中session我检查了数据背后的所有资源，它们都没有问题。如果我返回 MainActivity 并再次启动列表，则视图完全正确。所以一定是删除一整组后人口不正确的问题
如您所见，如果我只从最后一组中删除最后一个 child 和两个 child，则整个列表的填充是正确的。
以下是有关该应用的更多信息：
我使用一个房间数据库，其中有两个表保存数据。
一个表格包含带有名称和 ID 的类别，另一个表格用于单个预算记录，类别 ID 作为外键
在 BudgetListActivity 的 onCreate 中，我创建了两个 DAO 的 budgetDAO 和 categoryDAO 来获取数据并填充列表 allBudgetsList 和 all CatList。
有了这些信息，我创建了一个新数组 List allGroups ，其中包含视图所需的结构
- 分类为 header
- 由于外键
，预算为 children
（这里只有一句话：
与此同时，我已经尝试对提供给 ExpandableListAdapter 的数据使用散列图 - 但结果是相同的错误视图人口！）
有一个 contentView "budget_expandable_list" 设置为 ExpandableListAdapter。适配器应使用 ArrayList "allGroups"
中的数据填充此列表的组和 childs
这是应用程序的结构
可能是有些资源没有实际使用
我现在将给出 importand classes
的源代码
预算列表活动：
package com.wbapps.WBEasyBudgetManagement;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.CoordinatorLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ExpandableListView;
import android.widget.Toast;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class BudgetListActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
CoordinatorLayout coordinatorLayout;
private SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
//wb, 23Oct2018: now using an array list for the expandable list adapter
ArrayList<Group> allGroups = new ArrayList();
private ArrayAdapter adapter;
private final int REQUEST_CODE_EDIT = 1;
private BudgetDAO budgetDAO;
private CategoryDAO categoryDAO;
List<Budget> allBudgetsList;
List<Category> allCatsList;
ExpandableListView expListView;
List<String> expListViewTitle;
ExpandableListAdapter expAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.budget_expandable_list);
if (allGroups.size() > 0 ) {allGroups.clear();}
//get instances for DAO's of db from MainActivity
budgetDAO = MainActivity.getBudgetDAO();
categoryDAO = MainActivity.getCategoryDAO();
//the list for budgets and categories
allBudgetsList = budgetDAO.getBudgets();
allCatsList = categoryDAO.getCategories();
//temporary Group-Object for the ArrayList allGroups
Group tmpGroup;
double sumExpenses = 0;
//Start with reading all categories
for (int i=0;i<allCatsList.size(); i++) {
String tmpCat = allCatsList.get(i).getCategory();
tmpGroup = new Group(tmpCat);
sumExpenses = 0.0;
//now read all budgets for the current category and fill the rest of the temporary Group-Object
for (int j=0;j<allBudgetsList.size();j++){
if (allBudgetsList.get(j).getCategoryId() == allCatsList.get(i).getId()){
//tmpGroup.budgetId = allBudgetsList.get(j).getId();
tmpGroup.catId = allBudgetsList.get(j).getCategoryId();
tmpGroup.children.add(Arrays.asList
(
" Date: " + sdf.format(allBudgetsList.get(j).getDateTime())
+ " - Expenses: " + Double.toString(allBudgetsList.get(j).getExpenses()),
Long.toString(allBudgetsList.get(j).getId())
)
);
sumExpenses = sumExpenses + allBudgetsList.get(j).getExpenses();
tmpGroup.sumExpenses = sumExpenses;
}
}
//if at least one children for the current category was found
// =>> write all the group information the the array list
if (tmpGroup.children.size() > 0 ) {allGroups.add(tmpGroup);}
}
expListView = (ExpandableListView) findViewById(R.id.expandableList);
expAdapter = new ExpandableListAdapter(this, allGroups);
expListView.setAdapter(expAdapter);
expListView.setOnItemClickListener(this);
registerForContextMenu(expListView);
}
@Override
public void onCreateContextMenu(ContextMenu contMenu, View v,
ContextMenu.ContextMenuInfo contextMenuInfo) {
super.onCreateContextMenu(contMenu, v, contextMenuInfo);
ExpandableListView.ExpandableListContextMenuInfo info = (ExpandableListView.ExpandableListContextMenuInfo) contextMenuInfo;
int type = ExpandableListView.getPackedPositionType(info.packedPosition);
int groupPosition = ExpandableListView.getPackedPositionGroup(info.packedPosition);
int childPosition = ExpandableListView.getPackedPositionChild(info.packedPosition);
// Show context menu for groups
if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
contMenu.setHeaderTitle("Budget");
contMenu.add(R.string.context_editBudget);
contMenu.add(R.string.context_delBudget);
// Show context menu for children
} else if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
contMenu.setHeaderTitle("Child");
contMenu.add(R.string.context_editChild);
contMenu.add(R.string.context_delChild);
}
}
@Override
public boolean onContextItemSelected(MenuItem item) {
Integer tmpInt = item.getItemId();
ExpandableListView.ExpandableListContextMenuInfo info = (ExpandableListView.ExpandableListContextMenuInfo) item
.getMenuInfo();
int type = ExpandableListView.getPackedPositionType(info.packedPosition);
int groupPosition = ExpandableListView.getPackedPositionGroup(info.packedPosition);
int childPosition = ExpandableListView.getPackedPositionChild(info.packedPosition);
//TextView vItem = info.targetView.findViewById(R.id.context_editBudget);
if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
//Toast.makeText(this, "Click auf Group: " + Integer.toString(item.getGroupId()), Toast.LENGTH_SHORT).show();
if (item.getTitle().toString().equals(getString(R.string.context_editBudget))){
Toast.makeText(this, "Edit Budget clicked in Budget Context Menu", Toast.LENGTH_SHORT).show();
}
if (item.getTitle().toString().equals(getString(R.string.context_delBudget))){
int size = allGroups.get(groupPosition).children.size();
for (int i = 0; i<size; i++) {
budgetDAO.delAllBudgetsForCategory(allGroups.get(groupPosition).catId);
}
allGroups.remove(groupPosition);
//expAdapter.notifyDataSetChanged();
if (allGroups.size() == 0){
Intent intent = new Intent(BudgetListActivity.this, MainActivity.class);
startActivity(intent);
}
}
}
if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
if (item.getTitle().toString().equals(getString(R.string.context_editChild))){
Toast.makeText(this, "Edit Child clicked in Child Context Menu", Toast.LENGTH_SHORT).show();
}
if (item.getTitle().toString().equals(getString(R.string.context_delChild))){
//wb, 27Oct2018: Delete the selected child for a budget with given category
budgetDAO.delBudgetChildForCategory(Integer.parseInt(allGroups.get(groupPosition).children.get(childPosition).get(1)));
allGroups.get(groupPosition).children.remove(childPosition);
//expAdapter.notifyDataSetChanged();
//wb, 28Oct2018: If no more budget rows available delete the whole budget for category
if (allGroups.get(groupPosition).children.size() == 0) {
allGroups.remove(groupPosition);
//expAdapter.notifyDataSetChanged();
//expAdapter.notifyDataSetChanged();
if (allGroups.size() ==0){
Intent intent = new Intent(BudgetListActivity.this, MainActivity.class);
startActivity(intent);
}
}
/*
else {
//allGroups.get(groupPosition).sumExpenses = 0.0;
//allGroups.get(groupPosition) = expAdapter.getSum(groupPosition)
for (int i = 0; i < allBudgetsList.size(); i++) {
if (allBudgetsList.get(i).getCategoryId() == allGroups.get(groupPosition).catId) {
allGroups.get(groupPosition).sumExpenses =
allGroups.get(groupPosition).sumExpenses + allBudgetsList.get(i).getExpenses();
}
}
}*/
}
}
expAdapter.notifyDataSetChanged();
//return super.onContextItemSelected(item);
return true;
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Budget budget = (Budget)adapter.getItem(position);
editEntry(budget, position);
}
private void editEntry(Budget budget, int position) {
Intent intent = new Intent(this, EditBudgetActivity.class);
intent.putExtra("position", position);
startActivityForResult(intent, REQUEST_CODE_EDIT);
}
}
如您所见，我使用上下文菜单来编辑和删除组 and/or childs。一些功能尚未完全实现。请理解，我将首先关注正确填充 ExpandableView 的主要问题。
还有其他事情——比如删除 child 后费用汇总的不正确更新——还不是很重要，稍后会完成。
这里是 class 组 Object:
package com.wbapps.WBEasyBudgetManagement;
import java.util.ArrayList;
import java.util.List;
public class Group {
public long budgetId;
public long catId;
public String category;
public final List<List<String>> children = new ArrayList<List<String>>();
public final List<Long> BudIds = new ArrayList<Long>();
public double sumExpenses;
public Group(String pcategory) {
category = pcategory;
}
}
这是 ExpandableListAdapter 的来源：
包com.wbapps.WBEasyBudgetManagement;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.CheckedTextView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Currency;
import java.util.Locale;
public class ExpandableListAdapter extends BaseExpandableListAdapter{
Context context;
Locale locale;
Currency curr;
//array list to take the data for the list from the activity
private final ArrayList<Group> allGroups;
public LayoutInflater inflater;
public AppCompatActivity activity;
public int times = 0;
//Constructor for ExpandableListAdapter
//public ExpandableListAdapter(AppCompatActivity act, SparseArray<Group> groups) {
public ExpandableListAdapter(AppCompatActivity act, ArrayList<Group> allGroups) {
this.activity = act;
this.allGroups = allGroups;
inflater = act.getLayoutInflater();
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
times = times + 1;
Log.d("Info getGroupView","In getGroupView " + Integer.toString(times) + " times");
for (Locale wbLocale : Locale.getAvailableLocales()) {
//Log.d("LOCALES", wbLocale.getLanguage() + "_" + wbLocale.getCountry() + " [" + wbLocale.getDisplayName() + "]");
if (wbLocale.getCountry().equals("PH")) {
curr = Currency.getInstance(wbLocale);
curr.getSymbol(wbLocale);
break;
}
}
if (convertView == null || convertView.findViewById(R.id.tvCatGroup)==null){
convertView = inflater.inflate(R.layout.list_row_group, null);
}
convertView = inflater.inflate(R.layout.list_row_group, null);
String tmpCat = allGroups.get(groupPosition).category;
Group tmpGroup = new Group(tmpCat);
sortList();
Group group = (Group) getGroup(groupPosition);
//((CheckedTextView) convertView).setText(group.category + "\nTotal Expenses: " + group.sumExpenses + " " + curr.getSymbol());
((CheckedTextView) convertView).setText(group.category + "\nTotal Expenses: " + getSum(groupPosition) + " " + curr.getSymbol());
((CheckedTextView) convertView).setChecked(isExpanded);
return convertView;
}
/* wb, 18Sep2017: sort the list_selectedShoppingItems list */
public void sortList() {
Collections.sort(allGroups, new Comparator<Group>() {
@Override
public int compare(Group content1, Group content2) {
/* ignore case sensitivity */
return content1.category.compareToIgnoreCase(content2.category);
}
});
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent)
{
if(childPosition < getChildrenCount(groupPosition)-1) {
//holds the detail string for one child
final String children = (String) getChild(groupPosition, childPosition);
if (convertView == null || convertView.findViewById(R.id.tvChildRow)==null)
convertView = inflater.inflate(R.layout.list_row_details, null);
convertView = inflater.inflate(R.layout.list_row_details, null);
TextView txtChildRow = (TextView)convertView.findViewById(R.id.tvChildRow);
txtChildRow.setText(children + " " + curr.getSymbol());
convertView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(activity, children + " " + curr.getSymbol(),
Toast.LENGTH_SHORT).show();
}
});
}
//children is the last one
if(childPosition == getChildrenCount(groupPosition)-1)
{
if (convertView == null || convertView.findViewById(R.id.tvSum)==null)
convertView = inflater.inflate(R.layout.listview_footer,null);
TextView txtFooter = (TextView)convertView.findViewById(R.id.tvSum);
//txtFooter.setText("Total expenses: " + allGroups.get(groupPosition).sumExpenses + " " + curr.getSymbol() );
txtFooter.setText("Total expenses: " + getSum(groupPosition) + " " + curr.getSymbol() );
//Log.e(TAG, "getChildView - sumExpenses: "+txtFooter.getText().toString());
}
convertView.setLongClickable( true);
return convertView;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return allGroups.get(groupPosition).children.get(childPosition).get(0);
}
public Object getSum(int groupPosition) {
return allGroups.get(groupPosition).sumExpenses;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return 0;
}
//Add 1 to childCount. The last row is used as footer to childView
@Override
public int getChildrenCount(int groupPosition) {
return allGroups.get(groupPosition).children.size() +1;
}
@Override
public Object getGroup(int groupPosition) {
return allGroups.get(groupPosition);
}
@Override
public int getGroupCount() {
return allGroups.size();
}
@Override
public void onGroupCollapsed(int groupPosition) {
super.onGroupCollapsed(groupPosition);
}
@Override
public void onGroupExpanded(int groupPosition) {
super.onGroupExpanded(groupPosition);
}
@Override
public long getGroupId(int groupPosition) {
return 0;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
@Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
}
}
一些评论可能会有所帮助：
- 在 getChildrenCount 中，我将 size 的数量加 1，因为我使用最后一个 children 作为页脚来显示费用摘要
- 为了更好地理解这里有一张列表的图片"allGroups"
希望我能为您提供所有必要的信息。如果缺少某些内容，请告诉我。我会尽快添加它。
希望有人能为我提供解决方案。
祝你今天过得愉快
安德烈亚斯
同时我找到了这种行为的原因。适配器源代码末尾有一个方法"getGroupID"。这里的 return 值被设置为 0，这导致了问题。它必须设置为 groupPosition，然后它才能工作！
@Override
public long getGroupId(int groupPosition) {
/* wb, 10Nov2018: this statement was due to the error of deleting a last child of a group
With "return 0" the children of the remaining group was shown twice !!!
return 0;
*/
return groupPosition;
}
这希望对所有同样 运行 遇到此问题的人有所帮助。
玩得开心
安德烈亚斯
我在从 ExpandableListView 中删除组时遇到了很大的问题。即使在 google 很多次并尝试了很多教程和示例之后，我也无法解决它。
虽然我有很多编程经验，但我对 Android 编程比较了解。所以我确信源代码中有很多事情还没有做好。但截至目前，我想在从列表中删除一个组后以错误的观点关注问题。
为了更好地概述问题，这里有一些屏幕截图
应用程序启动
单击“列出所有预算”按钮后列出
所有组扩展
在删除最后一组child之前
剩余组显示child人两次
这次最后一组有两个children
删除最后一组children之前
删除最后一组child后的正确结果
我希望问题变得清楚。如果最后一个组只有一个 child 并且这个被删除，则整个组将被应用程序删除 - 但第一组的 children 会出现两次。
在调试的过程中session我检查了数据背后的所有资源，它们都没有问题。如果我返回 MainActivity 并再次启动列表，则视图完全正确。所以一定是删除一整组后人口不正确的问题
如您所见，如果我只从最后一组中删除最后一个 child 和两个 child，则整个列表的填充是正确的。
以下是有关该应用的更多信息：
我使用一个房间数据库，其中有两个表保存数据。
一个表格包含带有名称和 ID 的类别，另一个表格用于单个预算记录，类别 ID 作为外键
在 BudgetListActivity 的 onCreate 中，我创建了两个 DAO 的 budgetDAO 和 categoryDAO 来获取数据并填充列表 allBudgetsList 和 all CatList。 有了这些信息，我创建了一个新数组 List allGroups ，其中包含视图所需的结构 - 分类为 header - 由于外键
，预算为 children（这里只有一句话： 与此同时，我已经尝试对提供给 ExpandableListAdapter 的数据使用散列图 - 但结果是相同的错误视图人口！）
有一个 contentView "budget_expandable_list" 设置为 ExpandableListAdapter。适配器应使用 ArrayList "allGroups"
中的数据填充此列表的组和 childs这是应用程序的结构
可能是有些资源没有实际使用
我现在将给出 importand classes
的源代码预算列表活动：
package com.wbapps.WBEasyBudgetManagement;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.CoordinatorLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ExpandableListView;
import android.widget.Toast;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class BudgetListActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
CoordinatorLayout coordinatorLayout;
private SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
//wb, 23Oct2018: now using an array list for the expandable list adapter
ArrayList<Group> allGroups = new ArrayList();
private ArrayAdapter adapter;
private final int REQUEST_CODE_EDIT = 1;
private BudgetDAO budgetDAO;
private CategoryDAO categoryDAO;
List<Budget> allBudgetsList;
List<Category> allCatsList;
ExpandableListView expListView;
List<String> expListViewTitle;
ExpandableListAdapter expAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.budget_expandable_list);
if (allGroups.size() > 0 ) {allGroups.clear();}
//get instances for DAO's of db from MainActivity
budgetDAO = MainActivity.getBudgetDAO();
categoryDAO = MainActivity.getCategoryDAO();
//the list for budgets and categories
allBudgetsList = budgetDAO.getBudgets();
allCatsList = categoryDAO.getCategories();
//temporary Group-Object for the ArrayList allGroups
Group tmpGroup;
double sumExpenses = 0;
//Start with reading all categories
for (int i=0;i<allCatsList.size(); i++) {
String tmpCat = allCatsList.get(i).getCategory();
tmpGroup = new Group(tmpCat);
sumExpenses = 0.0;
//now read all budgets for the current category and fill the rest of the temporary Group-Object
for (int j=0;j<allBudgetsList.size();j++){
if (allBudgetsList.get(j).getCategoryId() == allCatsList.get(i).getId()){
//tmpGroup.budgetId = allBudgetsList.get(j).getId();
tmpGroup.catId = allBudgetsList.get(j).getCategoryId();
tmpGroup.children.add(Arrays.asList
(
" Date: " + sdf.format(allBudgetsList.get(j).getDateTime())
+ " - Expenses: " + Double.toString(allBudgetsList.get(j).getExpenses()),
Long.toString(allBudgetsList.get(j).getId())
)
);
sumExpenses = sumExpenses + allBudgetsList.get(j).getExpenses();
tmpGroup.sumExpenses = sumExpenses;
}
}
//if at least one children for the current category was found
// =>> write all the group information the the array list
if (tmpGroup.children.size() > 0 ) {allGroups.add(tmpGroup);}
}
expListView = (ExpandableListView) findViewById(R.id.expandableList);
expAdapter = new ExpandableListAdapter(this, allGroups);
expListView.setAdapter(expAdapter);
expListView.setOnItemClickListener(this);
registerForContextMenu(expListView);
}
@Override
public void onCreateContextMenu(ContextMenu contMenu, View v,
ContextMenu.ContextMenuInfo contextMenuInfo) {
super.onCreateContextMenu(contMenu, v, contextMenuInfo);
ExpandableListView.ExpandableListContextMenuInfo info = (ExpandableListView.ExpandableListContextMenuInfo) contextMenuInfo;
int type = ExpandableListView.getPackedPositionType(info.packedPosition);
int groupPosition = ExpandableListView.getPackedPositionGroup(info.packedPosition);
int childPosition = ExpandableListView.getPackedPositionChild(info.packedPosition);
// Show context menu for groups
if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
contMenu.setHeaderTitle("Budget");
contMenu.add(R.string.context_editBudget);
contMenu.add(R.string.context_delBudget);
// Show context menu for children
} else if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
contMenu.setHeaderTitle("Child");
contMenu.add(R.string.context_editChild);
contMenu.add(R.string.context_delChild);
}
}
@Override
public boolean onContextItemSelected(MenuItem item) {
Integer tmpInt = item.getItemId();
ExpandableListView.ExpandableListContextMenuInfo info = (ExpandableListView.ExpandableListContextMenuInfo) item
.getMenuInfo();
int type = ExpandableListView.getPackedPositionType(info.packedPosition);
int groupPosition = ExpandableListView.getPackedPositionGroup(info.packedPosition);
int childPosition = ExpandableListView.getPackedPositionChild(info.packedPosition);
//TextView vItem = info.targetView.findViewById(R.id.context_editBudget);
if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
//Toast.makeText(this, "Click auf Group: " + Integer.toString(item.getGroupId()), Toast.LENGTH_SHORT).show();
if (item.getTitle().toString().equals(getString(R.string.context_editBudget))){
Toast.makeText(this, "Edit Budget clicked in Budget Context Menu", Toast.LENGTH_SHORT).show();
}
if (item.getTitle().toString().equals(getString(R.string.context_delBudget))){
int size = allGroups.get(groupPosition).children.size();
for (int i = 0; i<size; i++) {
budgetDAO.delAllBudgetsForCategory(allGroups.get(groupPosition).catId);
}
allGroups.remove(groupPosition);
//expAdapter.notifyDataSetChanged();
if (allGroups.size() == 0){
Intent intent = new Intent(BudgetListActivity.this, MainActivity.class);
startActivity(intent);
}
}
}
if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
if (item.getTitle().toString().equals(getString(R.string.context_editChild))){
Toast.makeText(this, "Edit Child clicked in Child Context Menu", Toast.LENGTH_SHORT).show();
}
if (item.getTitle().toString().equals(getString(R.string.context_delChild))){
//wb, 27Oct2018: Delete the selected child for a budget with given category
budgetDAO.delBudgetChildForCategory(Integer.parseInt(allGroups.get(groupPosition).children.get(childPosition).get(1)));
allGroups.get(groupPosition).children.remove(childPosition);
//expAdapter.notifyDataSetChanged();
//wb, 28Oct2018: If no more budget rows available delete the whole budget for category
if (allGroups.get(groupPosition).children.size() == 0) {
allGroups.remove(groupPosition);
//expAdapter.notifyDataSetChanged();
//expAdapter.notifyDataSetChanged();
if (allGroups.size() ==0){
Intent intent = new Intent(BudgetListActivity.this, MainActivity.class);
startActivity(intent);
}
}
/*
else {
//allGroups.get(groupPosition).sumExpenses = 0.0;
//allGroups.get(groupPosition) = expAdapter.getSum(groupPosition)
for (int i = 0; i < allBudgetsList.size(); i++) {
if (allBudgetsList.get(i).getCategoryId() == allGroups.get(groupPosition).catId) {
allGroups.get(groupPosition).sumExpenses =
allGroups.get(groupPosition).sumExpenses + allBudgetsList.get(i).getExpenses();
}
}
}*/
}
}
expAdapter.notifyDataSetChanged();
//return super.onContextItemSelected(item);
return true;
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Budget budget = (Budget)adapter.getItem(position);
editEntry(budget, position);
}
private void editEntry(Budget budget, int position) {
Intent intent = new Intent(this, EditBudgetActivity.class);
intent.putExtra("position", position);
startActivityForResult(intent, REQUEST_CODE_EDIT);
}
}
如您所见，我使用上下文菜单来编辑和删除组 and/or childs。一些功能尚未完全实现。请理解，我将首先关注正确填充 ExpandableView 的主要问题。
还有其他事情——比如删除 child 后费用汇总的不正确更新——还不是很重要，稍后会完成。
这里是 class 组 Object:
package com.wbapps.WBEasyBudgetManagement;
import java.util.ArrayList;
import java.util.List;
public class Group {
public long budgetId;
public long catId;
public String category;
public final List<List<String>> children = new ArrayList<List<String>>();
public final List<Long> BudIds = new ArrayList<Long>();
public double sumExpenses;
public Group(String pcategory) {
category = pcategory;
}
}
这是 ExpandableListAdapter 的来源：
包com.wbapps.WBEasyBudgetManagement;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.CheckedTextView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Currency;
import java.util.Locale;
public class ExpandableListAdapter extends BaseExpandableListAdapter{
Context context;
Locale locale;
Currency curr;
//array list to take the data for the list from the activity
private final ArrayList<Group> allGroups;
public LayoutInflater inflater;
public AppCompatActivity activity;
public int times = 0;
//Constructor for ExpandableListAdapter
//public ExpandableListAdapter(AppCompatActivity act, SparseArray<Group> groups) {
public ExpandableListAdapter(AppCompatActivity act, ArrayList<Group> allGroups) {
this.activity = act;
this.allGroups = allGroups;
inflater = act.getLayoutInflater();
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
times = times + 1;
Log.d("Info getGroupView","In getGroupView " + Integer.toString(times) + " times");
for (Locale wbLocale : Locale.getAvailableLocales()) {
//Log.d("LOCALES", wbLocale.getLanguage() + "_" + wbLocale.getCountry() + " [" + wbLocale.getDisplayName() + "]");
if (wbLocale.getCountry().equals("PH")) {
curr = Currency.getInstance(wbLocale);
curr.getSymbol(wbLocale);
break;
}
}
if (convertView == null || convertView.findViewById(R.id.tvCatGroup)==null){
convertView = inflater.inflate(R.layout.list_row_group, null);
}
convertView = inflater.inflate(R.layout.list_row_group, null);
String tmpCat = allGroups.get(groupPosition).category;
Group tmpGroup = new Group(tmpCat);
sortList();
Group group = (Group) getGroup(groupPosition);
//((CheckedTextView) convertView).setText(group.category + "\nTotal Expenses: " + group.sumExpenses + " " + curr.getSymbol());
((CheckedTextView) convertView).setText(group.category + "\nTotal Expenses: " + getSum(groupPosition) + " " + curr.getSymbol());
((CheckedTextView) convertView).setChecked(isExpanded);
return convertView;
}
/* wb, 18Sep2017: sort the list_selectedShoppingItems list */
public void sortList() {
Collections.sort(allGroups, new Comparator<Group>() {
@Override
public int compare(Group content1, Group content2) {
/* ignore case sensitivity */
return content1.category.compareToIgnoreCase(content2.category);
}
});
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent)
{
if(childPosition < getChildrenCount(groupPosition)-1) {
//holds the detail string for one child
final String children = (String) getChild(groupPosition, childPosition);
if (convertView == null || convertView.findViewById(R.id.tvChildRow)==null)
convertView = inflater.inflate(R.layout.list_row_details, null);
convertView = inflater.inflate(R.layout.list_row_details, null);
TextView txtChildRow = (TextView)convertView.findViewById(R.id.tvChildRow);
txtChildRow.setText(children + " " + curr.getSymbol());
convertView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(activity, children + " " + curr.getSymbol(),
Toast.LENGTH_SHORT).show();
}
});
}
//children is the last one
if(childPosition == getChildrenCount(groupPosition)-1)
{
if (convertView == null || convertView.findViewById(R.id.tvSum)==null)
convertView = inflater.inflate(R.layout.listview_footer,null);
TextView txtFooter = (TextView)convertView.findViewById(R.id.tvSum);
//txtFooter.setText("Total expenses: " + allGroups.get(groupPosition).sumExpenses + " " + curr.getSymbol() );
txtFooter.setText("Total expenses: " + getSum(groupPosition) + " " + curr.getSymbol() );
//Log.e(TAG, "getChildView - sumExpenses: "+txtFooter.getText().toString());
}
convertView.setLongClickable( true);
return convertView;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return allGroups.get(groupPosition).children.get(childPosition).get(0);
}
public Object getSum(int groupPosition) {
return allGroups.get(groupPosition).sumExpenses;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return 0;
}
//Add 1 to childCount. The last row is used as footer to childView
@Override
public int getChildrenCount(int groupPosition) {
return allGroups.get(groupPosition).children.size() +1;
}
@Override
public Object getGroup(int groupPosition) {
return allGroups.get(groupPosition);
}
@Override
public int getGroupCount() {
return allGroups.size();
}
@Override
public void onGroupCollapsed(int groupPosition) {
super.onGroupCollapsed(groupPosition);
}
@Override
public void onGroupExpanded(int groupPosition) {
super.onGroupExpanded(groupPosition);
}
@Override
public long getGroupId(int groupPosition) {
return 0;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
@Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
}
}
一些评论可能会有所帮助： - 在 getChildrenCount 中，我将 size 的数量加 1，因为我使用最后一个 children 作为页脚来显示费用摘要
- 为了更好地理解这里有一张列表的图片"allGroups"
希望我能为您提供所有必要的信息。如果缺少某些内容，请告诉我。我会尽快添加它。
希望有人能为我提供解决方案。 祝你今天过得愉快 安德烈亚斯
同时我找到了这种行为的原因。适配器源代码末尾有一个方法"getGroupID"。这里的 return 值被设置为 0，这导致了问题。它必须设置为 groupPosition，然后它才能工作！
@Override
public long getGroupId(int groupPosition) {
/* wb, 10Nov2018: this statement was due to the error of deleting a last child of a group
With "return 0" the children of the remaining group was shown twice !!!
return 0;
*/
return groupPosition;
}
这希望对所有同样 运行 遇到此问题的人有所帮助。 玩得开心 安德烈亚斯