本文介绍了选择并更改瓷砖颤动的自定义高度后，更改ListTile的背景颜色的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已经创建了一个 GridView ，但是现在我需要在此 GridView 中选择一些 ListTiles ，选择后，我想要改变背景颜色.
I've made a GridView, but now I have some ListTiles in this GridView that I need to be selected Upon selection, I want the background color to change.
我还面临另一个问题，我想自定义这些 ListTile 的高度，但这样做没有任何成功.我要附上图片，我得到的输出和我想要的输出.
And I am also facing one more issue, I want to custom the heights of these ListTile, but I am not getting any success to do so. I am gonna attach the picture the output that I am getting and the output that I want.
我得到的是什么
我想要的东西:
这是代码:
class _SelectLanguageNewState extends State<SelectLanguageNew> {
List<Results> listResponseData;
bool _color;
@override
void initState() {
// TODO: implement initState
super.initState();
getLang();
_color = false;
}
Future getLang() async {
await getLanguage().then((GetLanguageResponse getlanguage)
{
if(getlanguage.isSuccess)
{
setState(() {
listResponseData = getlanguage.responseData.listResults;
});
}
});
}
@override
Widget build(BuildContext context) {
var size = MediaQuery.of(context).size;
final double itemHeight = (size.height - kToolbarHeight - 24) / 2;
final double itemWidth = size.width / 2;
void _onTileClicked(int index){
debugPrint("You tapped on item $index");
}
// Get grid tiles
List<Widget> _getTiles() {
final List<Widget> tiles = <Widget>[];
for (int i = 0; i < listResponseData.length; i++) {
tiles.add(ListTileTheme(
selectedColor: Colors.blue,
child: new InkWell(
child: new Card(
elevation: 5.0,
child: new Container(
color: _color ? Colors.black : Colors.grey,
alignment: Alignment.center,
child: new Text(listResponseData[i].nativeText,
style: TextStyle(color: Colors.white),),
),
),
onTap: () {
setState(() {
_color = !_color;
});
/* showDialog(
barrierDismissible: false,
context: context,
child: new CupertinoAlertDialog(
content: new Container(
width: 40.0,
child: new CircularProgressIndicator()),
actions: <Widget>[
new FlatButton(
onPressed: () {
Navigator.of(context).pop();
},
child: new Text("OK"))
],
),
);*/
},
),
));
}
return tiles;
}
return Scaffold(
bottomNavigationBar: BottomAppBar(
child: Container(
height: 50.0,
child: InkWell(
onTap: ()=> print('pressed'),
child: Center(
child: Text('Next', style: TextStyle(color: Colors.white,
),
),
),
),
),
color: Colors.blue,
),
body: new Container(
child: listResponseData == null || listResponseData.isEmpty ? new Container(
child: new Text('Loading data......'),
) : new GridView.count(
shrinkWrap: true,
scrollDirection: Axis.vertical,
childAspectRatio:1.0,
crossAxisCount: MediaQuery.of(context).size.width <= 400.0 ? 3 : MediaQuery.of(context).size.width >= 1000.0 ? 5 : 2,
// Create a grid with 2 columns. If you change the scrollDirection to
// horizontal, this would produce 2 rows.
crossAxisSpacing: 5.0,
// Generate 100 Widgets that display their index in the List
children: _getTiles() ,
),
),
);
}
}
推荐答案
屏幕截图
完整的解决方案:
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(scaffoldBackgroundColor: Colors.black, brightness: Brightness.dark),
home: Scaffold(
appBar: AppBar(title: Text("Choose Language")),
body: HomePage(),
),
);
}
}
class HomePage extends StatefulWidget {
@override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
int _languageIndex = -1;
@override
Widget build(BuildContext context) {
return Padding(
padding: const EdgeInsets.all(8.0),
child: Stack(
alignment: Alignment.bottomCenter,
children: <Widget>[
GridView.count(
crossAxisCount: 2,
crossAxisSpacing: 10,
mainAxisSpacing: 10,
childAspectRatio: 2.4,
children: <Widget>[
GestureDetector(
child: _buildWidget("English", 0),
onTap: () => setState(() => _languageIndex = 0),
),
GestureDetector(
child: _buildWidget("Española", 1),
onTap: () => setState(() => _languageIndex = 1),
),
GestureDetector(
child: _buildWidget("Française", 2),
onTap: () => setState(() => _languageIndex = 2),
),
GestureDetector(
child: _buildWidget("Gaeilge", 3),
onTap: () => setState(() => _languageIndex = 3),
),
GestureDetector(
child: _buildWidget("العربية", 4),
onTap: () => setState(() => _languageIndex = 4),
),
GestureDetector(
child: _buildWidget("جغتای", 5),
onTap: () => setState(() => _languageIndex = 5),
),
GestureDetector(
child: _buildWidget("ગુજરાતી", 6),
onTap: () => setState(() => _languageIndex = 6),
),
GestureDetector(
child: _buildWidget("हिन्दी", 7),
onTap: () => setState(() => _languageIndex = 7),
),
GestureDetector(
child: _buildWidget("日本語", 8),
onTap: () => setState(() => _languageIndex = 8),
),
GestureDetector(
child: _buildWidget("коми", 9),
onTap: () => setState(() => _languageIndex = 9),
),
GestureDetector(
child: _buildWidget("ਲਹਿੰਦੀ", 10),
onTap: () => setState(() => _languageIndex = 10),
),
GestureDetector(
child: _buildWidget("Schwyzerdütsch", 11),
onTap: () => setState(() => _languageIndex = 11),
),
],
),
SizedBox(
width: double.maxFinite,
height: 44,
child: RaisedButton(
child: Text("SUBMIT"),
onPressed: () {
print("languageIndex = ${_languageIndex}");
},
),
),
],
),
);
}
Widget _buildWidget(String language, int index) {
bool isSelected = _languageIndex == index;
return Container(
alignment: Alignment.center,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(6),
border: Border.all(color: isSelected ? Colors.blue[300].withOpacity(0.8) : Colors.grey[700]),
color: Colors.grey[900],
),
child: Text(
language,
style: TextStyle(fontSize: 16, color: isSelected ? Colors.blue[400] : null),
),
);
}
}
您可以使用 _languageIndex 来观看用户选择的语言.
You can watch which language user selected by using the _languageIndex.
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