flutter - 满足特定条件时向 Flutter App 推送本地通知

Question

当满足特定条件时，我想向我的颤振应用程序发送警报。例如，我的应用程序检测到水位上升，并将向我的应用程序发送水位上升的警报。当我运行这段代码时，它总是给我圆形指示器。

下面的代码是我的条件小部件：

Widget displayWarning() {
    if (inches1 < 10) {
      return Text(" 10 inches, WATER LEVEL is LOW");
    } else if (inches1 < 30) {
      return Text(" 30 inches, WATER LEVEL IS MEDIUM");
    } else if (inches1 < 50) {
      return Text("50 inches, WATER LEVEL IS HIGH");
    }
    return Text("Water level is CRITICAL");
  }

下面的代码是我的通知类：

import 'package:flutter_local_notifications/flutter_local_notifications.dart';

class NotificationApi {
  static final _notifications = FlutterLocalNotificationsPlugin();

  static Future _notificationDetails() async {
    return NotificationDetails(
      android: AndroidNotificationDetails(
        'channel id',
        'channel name',
        //'channel description',
        importance: Importance.max,
      ),
      iOS: IOSNotificationDetails(),
    );
  }

  static Future showNotification({
    int id = 0,
    String? title,
    String? body,
    String? payload,
  }) async => _notifications.show(
        id,
        title,
        body,
        await _notificationDetails(),
        payload: payload,
      );
    

}

下面的代码用于小部件或我的主 dart 文件：

FutureBuilder(
  future: NotificationApi.showNotification(
   title: 'ALERT',
   body: "There is a rise in water level",
  ),
  builder: (BuildContext context, AsyncSnapshot<dynamic> snapshot) {
    if(snapshot.hasData) {
      return displayWarning();
     }
     else {
      return Container(child: CircularProgressIndicator());
     }
    } 
),

标签： flutterpush-notificationflutter-futurebuilder