TimePicker的使用

Question

我尝试创建一个应用程序，当用户插入timePicker的时间相同时，发送通知(带有自定义文本)，但是通知根本没有出现。

MainActivity.kt

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    val UniqueID = 47245
    timePicker.setIs24HourView(true)
    button1.setOnClickListener {
        if((Calendar.HOUR_OF_DAY == timePicker.hour) && (Calendar.MINUTE == timePicker.minute)) {
            var notification = NotificationCompat.Builder(this, "M_CH_ID")
            notification.setSmallIcon(R.mipmap.ic_launcher)
            notification.setTicker(editText.text)
            notification.setWhen(System.currentTimeMillis())
            notification.setContentTitle("Notifica")
            notification.setContentText(editText.text)
            var ringtone: Uri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)
            var intent = Intent(this, MainActivity::class.java)
            var pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)
            notification.setContentIntent(pendingIntent)
            notification.setLights(Color.RED, 2500, 1000) 
            notification.setSound(ringtone)
            notification.setAutoCancel(true)
            var notManager: NotificationManager = getSystemService(NOTIFICATION_SERVICE) as NotificationManager
            notManager.notify(UniqueID, notification.build())
        }
    }
}

Answer 1

Calendar.HOUR_OF_DAY和Calendar.MINUTE是Calendar类中与get()方法一起使用的常量值。要获得当前的时间和分钟，您可以执行以下操作：

 val now = Calendar.newInstance()
 val hour = now.get(Calendar.HOUR_OF_DAY)
 val minute = now.get(Calendar.MINUTE)

这些是您的if检查应该针对的值。