小编Abh*_*wal的帖子

我是 kotlin 的新手，当我阅读 kotlin 中的数据类时，我发现了这些代码。它基本上是 java 模型类和 kotlin 数据类之间的比较，并且写在那里，两个代码都执行相同的任务。

代码1

public class VideoGame {

private String name;
private String publisher;
private int reviewScore;

public VideoGame(String name, String publisher, int reviewScore) {
    this.name = name;
    this.publisher = publisher;
    this.reviewScore = reviewScore;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getPublisher() {
    return publisher;
}

public void setPublisher(String publisher) {
    this.publisher = publisher;
}

public int getReviewScore() {
    return reviewScore;
} …

我正在使用 fcm 在我的应用程序中推送通知，但是当应用程序关闭并从最近的应用程序中清除时，通知不会出现。我可以使用 FCM api 将通知发送到特定主题。注意：- 当应用程序在后台时，通知工作正常

这是我的 FirebaseMessagingService 代码

@RequiresApi(api = Build.VERSION_CODES.O)

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {


    String title = remoteMessage.getNotification().getTitle();
    String body = remoteMessage.getNotification().getBody();

    Map<String, String> extraData = remoteMessage.getData();

 Log.d("DATA",remoteMessage.getData().toString());

    NotificationCompat.Builder notificationBuilder =
            new NotificationCompat.Builder(this, "TAC")
                    .setContentTitle(title)
                    .setContentText(body)
                    .setSmallIcon(R.drawable.ic_launcher_background);





    NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);


    int id =  (int) System.currentTimeMillis();

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
        NotificationChannel channel = new NotificationChannel("TAC","demo",NotificationManager.IMPORTANCE_HIGH);
        notificationManager.createNotificationChannel(channel);
    }
    notificationManager.notify(id,notificationBuilder.build());

}

}

这是通知发送者类代码

公共类通知发送者{

public  static RequestQueue mRequest;
public static String URL="https://fcm.googleapis.com/fcm/send";

public static void sendnotification(Context …