您好，我有一个应用程序，用户可以为主要类别创建子类别。当用户创建主类别时，主对象保存到数据库中，在我重新打开应用程序后我可以看到它们，但是当我为指定的主类别创建子类别时，我可以在子类别屏幕中看到，但是当我重新打开时该应用程序我可以看到唯一的主要类别，我猜子类别无法保存到数据库，我使用 Hive 将我的数据存储到手机，有人可以解释为什么我不能将子对象保存到数据库以及我该怎么做那。我卡住了谢谢你的帮助..
我共享主要类别屏幕，我让它们显示主要类别
class HomeScreen extends StatefulWidget {
HomeScreen({this.newCategoryName,this.newCategoryImagePath});
final String newCategoryImagePath;
final String newCategoryName;
static String id="homeScreen";
@override
_HomeScreenState createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
Widget buildBottomSheet(BuildContext context)=>AddMenuScreen(buttonText: "Menü Ekle",route: "homeScreen");
int _flag=0;
Box<CategoryModel> _categoryModelsBox;
void initState(){
super.initState();
_categoryModelsBox = Hive.box<CategoryModel>("categoryModelsInBox");
if (widget.newCategoryName!=null && widget.newCategoryImagePath!=null){
CategoryModel newCategoryModel = CategoryModel(categoryId:categoryModels.length, categoryImagePath: widget.newCategoryImagePath,
categoryName: widget.newCategoryName,categoryColor: Color((Random().nextDouble() * 0xFFFFFF).toInt()).withOpacity(0.5).value);
categoryModels.insert(categoryModels.length,newCategoryModel);
_categoryModelsBox.add(newCategoryModel);
}
}
Future<bool> showAlertDialog(BuildContext context){
AlertDialog alert = AlertDialog(
backgroundColor: kColorTheme10,
elevation: 0,
content: Container(decoration:BoxDecoration(
border: Border.all(style: BorderStyle.solid,width: 1),
color: Colors.white70.withOpacity(0.7),
borderRadius: BorderRadius.circular(15)
), child: Padding(
padding: EdgeInsets.all(8.0),
child: Text(
"Çıkmak istediğinizden emin misiniz?",
style: TextStyle(
fontSize: 25,
fontFamily: "OpenSans")
),
),
),
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(30)),
actions: [
Container(
decoration: BoxDecoration(
color: Colors.white70.withOpacity(0.7),
borderRadius: BorderRadius.circular(30)
),
child: TextButton(onPressed:()async{
Navigator.of(context).pop(true);
},
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text("EVET",style: TextStyle(fontWeight: FontWeight.bold,fontFamily: "OpenSans"),),
)),
),
Container(
decoration: BoxDecoration(
color:Colors.white70.withOpacity(0.7),
borderRadius: BorderRadius.circular(30)
),
child: TextButton(onPressed:()async{
Navigator.of(context).pop(false);
},
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text("HAYIR",style: TextStyle(fontWeight: FontWeight.bold, fontFamily: "OpenSans")),
),
),
),
],
);
return showDialog(
context: context,
builder: (_)=>alert);
}
@override
Widget build(BuildContext context) {
return WillPopScope(
child: SafeArea(
child: Scaffold(
backgroundColor: kColorTheme1,
appBar: AppBar(
centerTitle: true,
automaticallyImplyLeading: false,
elevation: 20,
backgroundColor: Color(0xFFF2C3D4).withOpacity(1),
title:TitleBorderedText(title:"Sevimli Yemekler", textColor: Color(0xFFFFFB00)),
actions: [
CircleAvatar(
radius: 27,
backgroundColor: Colors.transparent,
backgroundImage: AssetImage(kCuttedLogoPath),
),
],
),
body: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage(kBGWithLogoOpacity),
fit: BoxFit.cover,
),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Expanded(
child:GridView.builder (
scrollDirection: Axis.vertical,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
itemCount: _categoryModelsBox.length+1,
itemBuilder: (context,index) {
if(_categoryModelsBox.length==0){
return EmptyCard(where: "homeScreen",);
}
if(_flag==1){
return EmptyCard(where: "homeScreen",);
}
if(index==_categoryModelsBox.length-1){
_flag=1;
CategoryModel categoryModel = _categoryModelsBox.getAt(index);
return CategoryCard(category: categoryModel);
}
else{
CategoryModel categoryModel = _categoryModelsBox.getAt(index);
return CategoryCard(category: categoryModel);
}
}
),
),
Column(
mainAxisAlignment: MainAxisAlignment.end,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Padding(
padding: EdgeInsets.all(10),
child: Container(
decoration: BoxDecoration(
border: Border.all(style: BorderStyle.solid),
color: kColorTheme7,
borderRadius: BorderRadius.circular(40),
),
child: TextButton(
onPressed: (){
showModalBottomSheet(
isDismissible: false,
enableDrag: false,
context: context,
builder: (BuildContext context)=> AddMenuScreen(buttonText: "Menü Ekle",route: "homeScreen",),
);
},
child: TitleBorderedText(title: "LEZZET GRUBU EKLE",textColor: Colors.white,)
),
),
),
],
)
],
),
)
),
),
onWillPop: ()async{
var response = await showAlertDialog(context);
print(response);
return response;
},
);
}
}
我共享主类别屏幕，我在其中显示主类别的子类别
class SubCategoriesScreen extends StatefulWidget {
SubCategoriesScreen({this.categoryId,this.subCategoryName, this.subCategoryImagePath});
static String id="subCategoriesScreen";
final String subCategoryName;
final String subCategoryImagePath;
final int categoryId;
Widget buildBottomSheet(BuildContext context)=>AddMenuScreen(categoryId: categoryId,buttonText: "Tarif Ekle",route: "subCategoryScreen",);
@override
_SubCategoriesScreenState createState() => _SubCategoriesScreenState();
}
class _SubCategoriesScreenState extends State<SubCategoriesScreen> {
int _flag=0;
Box<CategoryModel> _categoryModelBox;
CategoryModel _categoryModel;
void initState(){
super.initState();
_categoryModelBox = Hive.box<CategoryModel>("categoryModelsInBox");
_categoryModel = _categoryModelBox.getAt(widget.categoryId);
if(widget.categoryId!=null && widget.subCategoryImagePath!=null && widget.subCategoryName!=null){
addSubCategory();
}
}
void addSubCategory()async{
SubCategoryModel subCategoryModel=SubCategoryModel(
subCategoryId:widget.categoryId,
subCategoryImagePath: widget.subCategoryImagePath,
subCategoryName: widget.subCategoryName,
categoryColor: Color((Random().nextDouble() * 0xFFFFFF).toInt()).withOpacity(0.5).value);
if(_categoryModel.subCategoryModels!=null){
//for (var categoryModel in categoryModels){
//if (categoryModel.categoryId == subCategoryModel.subCategoryId){
//categoryModel.subCategoryModels.insert(categoryModel.subCategoryModels.length-1,subCategoryModel);
//categoryModel.subCategoryModels.add(subCategoryModel);
_categoryModel=_categoryModelBox.getAt(widget.categoryId);
_categoryModel.subCategoryModels.add(subCategoryModel);
_categoryModelBox.putAt(widget.categoryId, _categoryModel);
//}
//}
}
}
@override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
body: Scaffold(
appBar: AppBar(
automaticallyImplyLeading: false,
centerTitle: true,
title: BorderedText(
child:Text(
_categoryModel.categoryName,
style: TextStyle(
color: Color(0XFFFFFB00),
fontSize: 30,
fontFamily: "OpenSans"
),
),
strokeWidth: 5,
strokeColor: Colors.black,
),
elevation: 5,
backgroundColor: Color(0xFFF2C3D4).withOpacity(1),
leading: IconButton(
icon: Icon(Icons.arrow_back),
onPressed: (){
Navigator.pop(context);
},
iconSize: 40,
color: Color(0xFFA2000B),
),
actions: [
CircleAvatar(
radius: 27,
backgroundColor: Colors.transparent,
backgroundImage: AssetImage("images/cuttedlogo.PNG"),
)
],
),
body:Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("images/logoBGopacity.png"),
fit: BoxFit.cover,
),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Expanded(
child: GridView.builder(
scrollDirection: Axis.vertical,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
itemCount:_categoryModel.subCategoryModels.length+1,
itemBuilder: (context,index){
if(_categoryModel.subCategoryModels.length==0){
return EmptyCard(where: "subCategoryScreen",categoryId: widget.categoryId,);
}
if(_flag==1){
return EmptyCard(where: "subCategoryScreen",categoryId: widget.categoryId,);
}
if(index==_categoryModel.subCategoryModels.length-1){
_flag=1;
SubCategoryModel subCategoryModel =_categoryModel.subCategoryModels[index];
return SubCategoryCard(subCategoryCardId:index,subCategoryId:subCategoryModel.subCategoryId,subcategoryName: subCategoryModel.subCategoryName,
subCategoryImagePath:subCategoryModel.subCategoryImagePath,
subCategoryCardColor: subCategoryModel.categoryColor,);
}
else{
SubCategoryModel subCategoryModel =_categoryModel.subCategoryModels[index];
return SubCategoryCard(subCategoryCardId:index,subCategoryId:subCategoryModel.subCategoryId,subcategoryName: subCategoryModel.subCategoryName,
subCategoryImagePath:subCategoryModel.subCategoryImagePath,
subCategoryCardColor: subCategoryModel.categoryColor,);
}
}
),
),
Column(
mainAxisAlignment: MainAxisAlignment.end,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Padding(
padding: EdgeInsets.all(10),
child: Container(
decoration: BoxDecoration(
border: Border.all(style: BorderStyle.solid),
color: kColorTheme7,
borderRadius: BorderRadius.circular(40),
),
child: TextButton(
onPressed: (){
showModalBottomSheet(
isDismissible: false,
enableDrag: false,
context: context,
builder: (BuildContext context)=> AddMenuScreen(categoryId:widget.categoryId,buttonText: "Tarif Ekle", route:"subCategoryScreen"),
);
},
child: BorderedText(
strokeWidth: 5,
strokeColor: Colors.black,
child:Text("Tarif Ekle",style: TextStyle(
color: Colors.white,
fontFamily:'OpenSans',
fontSize:30,
),
),
),
),
),
),
],
)
],
),
),
)
),
);
}
}
最后，我分享了我的课程代码和自动生成的配置单元文件。
part 'categoryModel.g.dart';
@HiveType(typeId : 0)
class CategoryModel extends HiveObject{
CategoryModel(
{ this.categoryId,
this.categoryImagePath,
this.categoryName,
this.categoryColor});
@HiveField(0)
final int categoryColor;
@HiveField(1)
List <SubCategoryModel> subCategoryModels=[];
@HiveField(2)
int categoryId;
@HiveField(3)
String categoryImagePath;
@HiveField(4)
String categoryName;
}
// GENERATED CODE - DO NOT MODIFY BY HAND
part of 'categoryModel.dart';
// **************************************************************************
// TypeAdapterGenerator
// **************************************************************************
class CategoryModelAdapter extends TypeAdapter<CategoryModel> {
@override
final int typeId = 1;
@override
CategoryModel read(BinaryReader reader) {
final numOfFields = reader.readByte();
final fields = <int, dynamic>{
for (int i = 0; i < numOfFields; i++) reader.readByte(): reader.read(),
};
return CategoryModel(
categoryId: fields[2] as int,
categoryImagePath: fields[3] as String,
categoryName: fields[4] as String,
categoryColor: fields[0] as int,
//subCategoryModels: (fields[1] as List)?.cast<SubCategoryModel>()
);
}
@override
void write(BinaryWriter writer, CategoryModel obj) {
writer
..writeByte(5)
..writeByte(0)
..write(obj.categoryColor)
..writeByte(1)
..write(obj.subCategoryModels)
..writeByte(2)
..write(obj.categoryId)
..writeByte(3)
..write(obj.categoryImagePath)
..writeByte(4)
..write(obj.categoryName);
}
@override
int get hashCode => typeId.hashCode;
@override
bool operator ==(Object other) =>
identical(this, other) ||
other is CategoryModelAdapter &&
runtimeType == other.runtimeType &&
typeId == other.typeId;
}
part 'subCategoryModel.g.dart';
@HiveType(typeId : 1)
class SubCategoryModel extends HiveObject{
SubCategoryModel({
this.subCategoryId,
this.subCategoryImagePath,
this.subCategoryName,
this.categoryColor,
this.recipeId,
List<Ingredient>ingredients,
this.recipePhotoDir,
this.recordedVoiceDir,
bool isCompeted});
@HiveField(0)
final int categoryColor;
@HiveField(1)
final double recipeId;
@HiveField(2)
bool isCompleted;
@HiveField(3)
int subCategoryId;
@HiveField(4)
String subCategoryImagePath;
@HiveField(5)
String subCategoryName;
@HiveField(6)
List <Ingredient> ingredients=[] ;
@HiveField(7)
String recipePhotoDir;
@HiveField(8)
String recordedVoiceDir;
}
// GENERATED CODE - DO NOT MODIFY BY HAND
part of 'subCategoryModel.dart';
// **************************************************************************
// TypeAdapterGenerator
// **************************************************************************
class SubCategoryModelAdapter extends TypeAdapter<SubCategoryModel> {
@override
final int typeId = 2;
@override
SubCategoryModel read(BinaryReader reader) {
final numOfFields = reader.readByte();
final fields = <int, dynamic>{
for (int i = 0; i < numOfFields; i++) reader.readByte(): reader.read(),
};
return SubCategoryModel(
subCategoryId: fields[3] as int,
subCategoryImagePath: fields[4] as String,
subCategoryName: fields[5] as String,
categoryColor: fields[0] as int,
recipeId: fields[1] as double,
ingredients: (fields[6] as List)?.cast<Ingredient>(),
recipePhotoDir: fields[7] as String,
recordedVoiceDir: fields[8] as String,
)..isCompleted = fields[2] as bool;
}