java - 如何创建 Android 通知？

Question

我正在尝试创建一个不需要在用户屏幕上弹出的通知，但我需要将其显示在通知栏中。请告诉我以下代码有什么问题，因为它没有输出任何通知:

    Intent notificationIntent = new Intent(this, ToDoList.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
            notificationIntent, 0);
    NotificationCompat.Builder builder =
            new NotificationCompat.Builder(getApplicationContext())
                    .setSmallIcon(R.mipmap.ic_launcher)
                    .setContentTitle("Title")
                    .setContentIntent(pendingIntent)
                    .setContentText("Notification text");

    Notification notification = builder.build();

    NotificationManager notificationManager =
            (NotificationManager) getApplicationContext().getSystemService(NOTIFICATION_SERVICE);
    notificationManager.notify(NOTIF_ID, notification);

Answer 1

我使用下面的 func 创建一个简单的通知(它是用 Kotlin 编写的)

private fun showNotification(context: Context, title: String, body: String) {
        val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            val mChannel = NotificationChannel(channelId, channelName, NotificationManager.IMPORTANCE_HIGH)
            notificationManager.createNotificationChannel(mChannel)
        }

        val notificationBuilder = NotificationCompat.Builder(context, channelId)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle(title)
                .setContentText(body)
                .setAutoCancel(true)

        val stackBuilder = TaskStackBuilder.create(context)
        val resultPendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT)
        notificationBuilder.setContentIntent(resultPendingIntent)
        notificationManager.notify(notificationId, notificationBuilder.build())
    }