android - 如何在 Dart 帖子请求中发送数组

Question

我尝试使用它们的 registration_ids 向设备组发送消息。

这是我的代码:

List<String> tokens=["token1","token2"];
final  url='https://fcm.googleapis.com/fcm/send';
 http.post(url,headers:{
  "Accept": "application/json",
  "Authorization":"key=mykey"
  ,"project_id":"proID"
},
body: 
  {
 "registration_ids" :tokens ,
 "collapse_key" : "type_a",
 "notification" : {
     "body" : "Body of Your Notification",
     "title": "Title of Your Notification"
 }
}

当应用程序运行时显示此错误:

Exception has occurred. _CastError (type 'List' is not a subtype of type 'String' in type cast)

如何解决？

Answer 1

问题解决了；我刚刚对正文进行了编码:

List<String> tokens=["token1","token2"];
final  url='https://fcm.googleapis.com/fcm/send';
 http.post(url,headers:{
  "Accept": "application/json",
  "Authorization":"key=mykey"
  ,"project_id":"proID"
},
body:json.encode( 
  {
 "registration_ids" :tokens ,
 "collapse_key" : "type_a",
 "notification" : {
     "body" : "Body of Your Notification",
     "title": "Title of Your Notification"
 }
)
}