how to get data from firebase notification in java

To retrieve data from a Firebase notification in Java, you can use the getData() method of the RemoteMessage object. This method returns a Map<String, String> containing the key-value pairs of the data payload included in the notification.

Here's an example of how you can retrieve and access the data payload of a Firebase notification in a Java app:

import com.google.firebase.messaging.RemoteMessage;

// ...

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    Map<String, String> data = remoteMessage.getData();
    String value = data.get("key");
    // Do something with the value
}

In this example, the data payload of the notification is accessed as a Map object and the value for the key "key" is retrieved using the get() method. You can then use this value in your app as needed.

It's important to note that the data payload of a Firebase notification is optional and may not be included in every notification. You should check for the presence of the data payload and handle it appropriately in your app.