Flutter 颤振UI列表项
我正在使用下面的代码，但无法达到预期的结果，我是颤振世界的新手，请让我知道在哪里可以改进以获得预期的结果。下面是我所做的工作的源代码Flutter 颤振UI列表项,flutter,flutter-layout,Flutter,Flutter Layout,我正在使用下面的代码，但无法达到预期的结果，我是颤振世界的新手，请让我知道在哪里可以改进以获得预期的结果。下面是我所做的工作的源代码 return Expanded( child: GridView.builder( controller: _scrollController, gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCou
return Expanded(
child: GridView.builder(
controller: _scrollController,
gridDelegate:
SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
itemCount: albumList.length,
itemBuilder: (BuildContext context, int index) {
return buildRow(index);
},
),
);
Widget buildRow(int index) {
return AlbumTile(
index: index,
albumList: albumList,
deleteAlbum: _deleteAlbum,
);
}
class AlbumTile extends StatelessWidget {
AlbumTile(
{Key key,
@required this.index,
@required this.albumList,
@required this.deleteAlbum})
: super(key: key);
final int index;
final List<Album> albumList;
final Function deleteAlbum;
@override
build(BuildContext context) {
String thumb;
if (albumList.elementAt(index).thumbUrl != "") {
thumb = WEBSERVICE_IMAGES +
albumList.elementAt(index).userId.toString() +
'/' +
albumList.elementAt(index).id.toString() +
'/' +
albumList.elementAt(index).thumbUrl;
} else {
thumb = "https://cdn.pixabay.com/photo/2015/12/01/20/28/road-1072823__340.jpg";
}
return GestureDetector(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
new AlbumPage(tabIndex: index, albumList: albumList),
),
);
},
child: Container(
// height of the card which contains full item
height: MediaQuery.of(context).size.height * 0.4,
width: MediaQuery.of(context).size.width * 0.28,
// this is the background image code
decoration: BoxDecoration(
image: DecorationImage(
fit: BoxFit.cover,
// url is my own public image url
image: NetworkImage(thumb),
),
borderRadius: BorderRadius.circular(12.0)),
// this is the item which is at the bottom
child: Align(
// aligment is required for this
alignment: Alignment.bottomLeft,
// items height should be there, else it will take whole height
// of the parent container
child: Container(
padding: EdgeInsets.only(left: 10.0, right: 0.0),
height: MediaQuery.of(context).size.height * 0.1,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Expanded(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
// Text() using hard coded text right now
Text(albumList.elementAt(index).name,
style: TextStyle(
fontSize: 18.5,
color: Colors.white,
fontWeight: FontWeight.w500)),
SizedBox(height: 3.0),
Text(albumList.elementAt(index).photos.toString() +' photos',
style: TextStyle(
fontSize: 12.5,
color: Colors.white,
fontWeight: FontWeight.w500))
],
),
),
// pop-up item
PopupMenuButton(
icon: Icon(Icons.more_vert, color: Colors.white),
itemBuilder: (_) => <PopupMenuItem<String>>[
new PopupMenuItem<String>(
child: Row(
children: <Widget>[
Icon(Icons.delete),
Text(
'Delete Album',
),
],
),
value: 'Delete',
),
],
onSelected: (value) {
deleteAlbum(albumList.elementAt(index).id, index);
},
),
],
),
),
),
),
);
GestureDetector(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
new AlbumPage(tabIndex: index, albumList: albumList),
),
);
},
child: Padding(
padding: const EdgeInsets.all(12.0),
child: Stack(
fit: StackFit.loose,
children: <Widget>[
ClipRRect(
borderRadius: new BorderRadius.circular(8.0),
child: FadeInImage.assetNetwork(
height: 1000,
placeholder: kPlaceHolderImage,
image: thumb,
fit: BoxFit.cover,
),
),
Align(
alignment: Alignment.bottomLeft,
child: Row(
children: [
Expanded(
child: Padding(
padding: const EdgeInsets.fromLTRB(8, 0, 0, 0),
child: Text(
albumList.elementAt(index).name,
style: TextStyle(
color: Colors.white,
fontSize: 18.5,
),
textAlign: TextAlign.left,
),
),
),
PopupMenuButton(
icon: ImageIcon(
AssetImage("graphics/horizontal_dots.png"),
color: Colors.white,
),
itemBuilder: (_) => <PopupMenuItem<String>>[
new PopupMenuItem<String>(
child: Row(
children: <Widget>[
Icon(Icons.delete),
Text(
'Delete Album',
),
],
),
value: 'Delete',
),
],
onSelected: (value) {
deleteAlbum(albumList.elementAt(index).id, index);
}),
],
),
),
],
),
),
);
}
}
类AlbumTile扩展了无状态小部件{
相册(
{键，
@需要这个索引，
@需要此列表，
@此项为必需。deleteAlbum}）
：super（key:key）；
最终整数指数；
最终列表欢迎来到Flatter。非常棒的平台，让您在构建跨平台移动应用程序
上开始职业生涯
我的代码对你来说会有点不同，但是相信我，这会适合你的
请注意：您需要更改某些部分，例如更改NetworkImage（）
的图像url
、onTap
函数、Text（）
内容等。但整个小部件代码中没有太多更改。因此，请查找这些更改，并进行相应的更改。您将到达：）
如果您对间距不满意，请继续玩。我希望这会有帮助。请让我知道。：）您需要在代码中添加一些东西来获得结果……要获得照片小部件的数量，您可以使用列包装它，也可以使用richtext。单击三点图标称为more\u vert更垂直的按钮会弹出弹出菜单对话框。为什么@kanwarpreething的输出是代码的结果。如果您从该代码中获得了任何帮助，请共享您的代码，以及您在这里遇到的问题。编辑：）让我们看看问题并解决它伟大的@kanwarpreething等待！让我e know:）完成。请检查当前代码和屏幕截图。请参阅@KanwarpreetSingh它是否正常。您关心的是小部件的UI，而不是整个UI。因此，您只指出了卡片代码。我只对卡片代码进行了更改。现在是关于这些卡片的整个页面UI。这两件事是不同的Kanwar。我是我现在就为你做。请等一会儿：）等等，我也会给你提供格里夫视图的代码。
GestureDetector(
onTap: () => print('Works!'), // <-- onTap change, I have used print()
child: Container(
// height of the card which contains full item
height: MediaQuery.of(context).size.height * 0.4,
width: MediaQuery.of(context).size.width * 0.28,
// this is the background image code
decoration: BoxDecoration(
image: DecorationImage(
fit: BoxFit.cover,
// url is my own public image url
image: NetworkImage('https://cdn.pixabay.com/photo/2015/12/01/20/28/road-1072823__340.jpg')
),
borderRadius: BorderRadius.circular(12.0)
),
// this is the item which is at the bottom
child: Align(
// aligment is required for this
alignment: Alignment.bottomLeft,
// items height should be there, else it will take whole height
// of the parent container
child: Container(
padding: EdgeInsets.only(left: 10.0, right: 0.0),
height: MediaQuery.of(context).size.height * 0.1,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Expanded(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
// Text() using hard coded text right now
Text('Potraits', style: TextStyle(fontSize: 20.0, color: Colors.white, fontWeight: FontWeight.w500)),
SizedBox(height: 3.0),
Text('150 photos', style: TextStyle(fontSize: 17.0, color: Colors.white, fontWeight: FontWeight.w500))
]
)
),
// pop-up item
PopupMenuButton(
icon: Icon(Icons.more_vert, color: Colors.white),
itemBuilder: (_) => <PopupMenuItem<String>>[
new PopupMenuItem<String>(
child: Row(
children: <Widget>[
Icon(Icons.delete),
Text(
'Delete Album',
),
],
),
value: 'Delete',
),
],
onSelected: (value) {
//your function
}
)
]
)
)
)
)
)
Widget buildRow(int index) {
return Padding(
padding: EdgeInsets.all(10.0),
child: AlbumTile(
index: index,
albumList: albumList,
deleteAlbum: _deleteAlbum,
)
);
}