当应用程序未运行时，Android Studio 无法接受推送通知的负载。要解决此问题，您需要在应用程序中实现 FirebaseMessagingService 类以处理通知负载。在 FirebaseMessagingService 类中，您可以使用 onMessageReceived 方法来接收通知负载并执行所需的操作。以下是一个示例：

public class MyFirebaseMessagingService extends FirebaseMessagingService {

private static final String TAG = "MyFirebaseMessagingService";

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    super.onMessageReceived(remoteMessage);

    // Get notification payload
    String notificationTitle = remoteMessage.getNotification().getTitle();
    String notificationBody = remoteMessage.getNotification().getBody();

    // Get data payload
    String dataValue1 = remoteMessage.getData().get("key1");
    String dataValue2 = remoteMessage.getData().get("key2");

    // Handle notification
    sendNotification(notificationTitle, notificationBody, dataValue1, dataValue2);
}

private void sendNotification(String notificationTitle, String notificationBody, String dataValue1, String dataValue2) {
    // Build notification
    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, "channel_id")
            .setContentTitle(notificationTitle)
            .setContentText(notificationBody)
            .setSmallIcon(R.drawable.ic_notification)
            .setAutoCancel(true);

    // Handle data payload
    if (dataValue1 != null && dataValue2 != null) {
        // Do something with data values
    }

    // Show notification
    NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
    notificationManager.notify(0, notificationBuilder.build());
}

}

您还需要在 AndroidManifest.xml 文件中声明您的 FirebaseMessagingService 类，如下所示：

现在您可以在应用程序未运行时接受推送通知并处理通知负载。