我正在构建一个使用streambuilder从Firestore提取数据的应用。
我在Firestore上只写了6个文档,但是我仅用一部电话就可以读取350多次,请问如何减少这种情况?
我也看到了一篇有关如何使用Cache减少读取次数的文章,但这是针对Java(Android)的,我不知道该如何在flutter中使用它。
StreamBuilder<QuerySnapshot>(
stream: Firestore.instance
.collection("free")
.where("created", isGreaterThan: DateTime.now().subtract(Duration(hours: 24)))
.snapshots(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
return Text('.....Loading');
}
return ListView.builder(
scrollDirection: Axis.vertical,
itemCount: snapshot.data.documents.length,
itemBuilder: (context, index) {
DocumentSnapshot free =
snapshot.data.documents[index];
return Container(
padding: EdgeInsets.all(10),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
Column(
children: [
Text(
'${free['safe']['time']}',
style: TextStyle(fontSize: 18),
),
SizedBox(
height: 3,
),
Text(
'${free['safe']['date']}',
style: TextStyle(fontSize: 13),
),
],
),
// SizedBox(width:20,),
SizedBox(
width:
0.5 * MediaQuery.of(context).size.width,
child: Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: [
Text(
'${free['safe']['league']}',
style: TextStyle(fontSize: 15),
),
SizedBox(
height: 2,
),
Text(
'${free['safe']['home']}',
style: TextStyle(
fontSize: 18,
fontWeight: FontWeight.w500),
),
SizedBox(
height: 3,
),
Text(
'vs ${free['safe']['away']}',
style: TextStyle(
fontSize: 18,
fontWeight: FontWeight.w500),
),
SizedBox(
height: 3,
),
Text(
'${free['safe']['tip']}',
style: TextStyle(
fontSize: 18,
fontWeight: FontWeight.bold,
color: Colors.redAccent),
),
],
),
),
// SizedBox(width:20,),
Column(
children: [
Text(
'${free['safe']['odd']}',
style: TextStyle(fontSize: 18),
),
SizedBox(
height: 4,
),
Builder(
builder: (context) {
if (free['safe']['result'] == 'win') {
return Column(
children: [
Icon(
Icons.check_circle,
color: Colors.green,
),
SizedBox(
height: 8,
),
Text(
'WON',
style: TextStyle(
color: Colors.green,
fontWeight:
FontWeight.bold),
)
],
);
} else if (free['safe']['result'] ==
'loss') {
return Column(
children: [
Icon(
Icons.close,
color: Colors.red,
),
SizedBox(
height: 8,
),
Text(
'LOSS',
style: TextStyle(
color: Colors.red,
fontWeight:
FontWeight.bold),
)
],
);
} else {
return Text('...');
}
},
),
],
),
],
),
);
});
}),