在Firebase控制台设置后，Android计划未显示通知

Question

我正在学习如何从firebase Console发送定期通知到我的Android应用程序：

homepage.java ：

protected void onCreate(@Nullable Bundle savedInstanceState) {            

  startService(new Intent(getApplicationContext(),firebase_connection.class)); 
 //Here I am calling the service class
        
}

---

firebase_connection.java ：

public class firebase_connection extends FirebaseMessagingService {
    @Override
    public void onMessageReceived(@NonNull RemoteMessage message) {
        super.onMessageReceived(message);
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel("MyNotifications","MyNotifications", NotificationManager.IMPORTANCE_DEFAULT);
            NotificationManager manager = getSystemService(NotificationManager.class);
            manager.createNotificationChannel(channel);
        }
        FirebaseMessaging.getInstance().subscribeToTopic("electric").addOnCompleteListener(new OnCompleteListener<Void>() {
            @Override
            public void onComplete(@NonNull Task<Void> task) {
                String msg = "Welcome to my app";
                if(!task.isSuccessful())
                    msg = "Sorry";
                Toast.makeText(getApplicationContext(),msg,Toast.LENGTH_SHORT).show();
            }
        });
    }
}

我的firebase Console ：

这是我的计划通知

---

我一直在等待直到9:40 am（如我的通知设置中设置的设置给定上述屏幕截图），没有出现通知。我是Firebase的新手，我要去哪里出错？请帮我。

我正在实际设备上运行该应用

Answer 1

您缺少很多东西。首先，您必须在androidManifest内部声明firebasemessagingservice在application> application> application tag：

<service android:name=".firebase_connection">
    <intent-filter>
        <action android:name="com.google.firebase.MESSAGING_EVENT" />
    </intent-filter>
</service>

而不是调用 in in in in 代码> on Createe方法，您必须订阅主题。目前，您在通知服务本身中订阅，这是完全错误的。

protected void onCreate(@Nullable Bundle savedInstanceState) {            
  FirebaseMessaging.getInstance().subscribeToTopic("electric").addOnCompleteListener(new OnCompleteListener<Void>() {
       @Override
       public void onComplete(@NonNull Task<Void> task) {
           String msg = "Welcome to my app";
           if(!task.isSuccessful())
               msg = "Sorry";
           Toast.makeText(getApplicationContext(),msg,Toast.LENGTH_SHORT).show();
       }
   });
}

最后，在firebasemessagingservice中，您只是创建一个通知频道，而不是创建通知本身。这样做：

public class firebase_connection extends FirebaseMessagingService {
    @Override
    public void onMessageReceived(@NonNull RemoteMessage message) {
        super.onMessageReceived(message);

        NotificationManager manager = getSystemService(NotificationManager.class);

        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel("channel1","My Notification", NotificationManager.IMPORTANCE_DEFAULT);
            channel.setDescription("description");
            manager.createNotificationChannel(channel);
        }
        
        if (remoteMessage.getNotification() != null) {
            Notification notification = NotificationCompat.Builder(context, "channel1")
            .setSmallIcon(R.drawable.ic_launcher_foreground)
            .setContentTitle(message.getNotification().getTitle())
            .setContentText(message.getNotification().getBody())
            .build();

             manager.notify(1, notification)
        }
    }
}

您可以使用remotemessage对象来获取标题和您从firebase控制台发送的文本，如上所述。希望它能解决！