我正在开发 flutter 应用程序（当树莓派检测到移动时通知用户）。一切正常。
- 将 flutter 应用程序连接到 mqtt 代理
- 订阅主题
- 从 mqtt 代理获取消息，我可以在控制台日志中看到它们
我的问题是，当我从 MQTT 经纪人那里收到消息时，我想 push notification 。我尝试了“flutter_local_notification”，但我能找到的只是使用触发按钮的教程。
void _subscribeToTopic(String topicName) {
print('Subscribing to the $topicName topic');
client.subscribe(topicName, MqttQos.atMostOnce);
// print the message when it is received
client.updates?.listen((List<MqttReceivedMessage<MqttMessage>>? c) {
final recMess = c![0].payload as MqttPublishMessage;
final message =
MqttPublishPayload.bytesToStringAsString(recMess.payload.message);
print('YOU GOT A NEW MESSAGE:');
// i want to push notifation
print(message);
});
}回答1
我找到了一个解决方案，我使用“fluter_local_notification”创建了一个通知服务，然后当我从 mqtt 代理收到消息时调用了 shownotification 函数。
void _subscribeToTopic(String topicName) {
print('Subscribing to the $topicName topic');
client.subscribe(topicName, MqttQos.atMostOnce);
// print the message when it is received
client.updates?.listen((List<MqttReceivedMessage<MqttMessage>>? c) {
final recMess = c![0].payload as MqttPublishMessage;
final message =
MqttPublishPayload.bytesToStringAsString(recMess.payload.message);
print('YOU GOT A NEW MESSAGE:');
// i want to push notifation
NotificationService()
.showNotification(1, 'check your mailbox', 'you have new mail', 1);
print(message);
});}