全屏通知 Android Kotlin

Question

我构建了一个小应用程序，它有提醒并在您的提醒被触发时发送通知，我想添加的是全屏通知（或触发警报时弹出的活动）用户的手机是否关闭，锁定，管他呢。安卓手机的默认闹钟应用程序的想法相同。我到处搜索，youtube，google 等。但没有找到任何东西

我尝试使用 setFullScreenIntent()，但只显示正常通知。

这是我在主要活动中的通知渠道代码：

    private fun createNotificationChannel() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
            var sound = Uri.parse("android.resource://" + applicationContext.packageName + "/" + R.raw.siren);
            val soundAttributes = AudioAttributes.Builder()
                .setUsage(AudioAttributes.USAGE_ALARM)
                .build()
            val name : CharSequence = "ReminderAlarm"
            val description = "Channel for alarm manager"
            val importance = NotificationManager.IMPORTANCE_HIGH
            val notificationChannel = NotificationChannel("androidAlarm4", name, importance)
            notificationChannel.description = description
            notificationChannel.setSound(sound, soundAttributes)
            val manager = getSystemService(NOTIFICATION_SERVICE) as NotificationManager
            manager.createNotificationChannel(notificationChannel)
            Log.e("notification: ", "created a notification ")
        }
    }

我在 AddActivity 中添加警报类：

    private fun setAlarm() {
        alarmManager = getSystemService(ALARM_SERVICE) as AlarmManager
        val intent = Intent(this, AlarmReceiver::class.java)
        val pendingIntent = PendingIntent.getBroadcast(this, (0..19991).random(), intent, PendingIntent.FLAG_IMMUTABLE)
        calendar.set(Calendar.HOUR_OF_DAY, editTime.hour)
        calendar.set(Calendar.MINUTE, editTime.minute)
        calendar.set(Calendar.SECOND, 0)
        if (repeatSwitch.isChecked){
            alarmManager.setRepeating(
                AlarmManager.RTC_WAKEUP,
                calendar.timeInMillis,
                AlarmManager.INTERVAL_DAY,
                pendingIntent
            )
            Toast.makeText(this, "Repeating alarm set", Toast.LENGTH_SHORT).show()
            Log.e("notification: ", "${pendingIntent.hashCode()}")
        }else {
            alarmManager.setExactAndAllowWhileIdle(
                AlarmManager.RTC_WAKEUP,
                calendar.timeInMillis,
                pendingIntent
            )
            Toast.makeText(this, "alarm set", Toast.LENGTH_SHORT).show()
            Log.e("notification: ", "${pendingIntent.hashCode()}")
        }


    }

我的报警接收器类：

private lateinit var pendingIntent: PendingIntent
private lateinit var fullScreenPendingIntent: PendingIntent

class AlarmReceiver : BroadcastReceiver() {
    val notificationId = 2
    val channelID = "androidAlarm4"

    override fun onReceive(context: Context?, intent: Intent?) {

        pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_IMMUTABLE)
        val fullScreenNotification = Intent(context, AlarmPage::class.java)
        fullScreenPendingIntent = PendingIntent.getActivity(context, 0, fullScreenNotification,PendingIntent.FLAG_IMMUTABLE)
        var sound = Uri.parse("android.resource://" + context?.packageName + "/" + R.raw.siren);
        val notification = NotificationCompat.Builder(context!!, channelID)
            .setSmallIcon(drawable.notification_bg)
            .setContentTitle("Reminder OFF")
            .setContentText("Work has to be done now!!")
            .setPriority(NotificationCompat.PRIORITY_HIGH)
            .setSound(sound)
            .setAutoCancel(true)
            .setCategory(NotificationCompat.CATEGORY_ALARM)
            .setFullScreenIntent(pendingIntent, true)
            .build()

        val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        notificationManager.notify(notificationId, notification)
        Log.e("notification: ", "received a notification: ")
    }
}

闹钟关闭应该弹出的页面是空的，不知道要不要加代码，就是这个页面：

class AlarmPage : AppCompatActivity() {
    private lateinit var stopReminder : Button
    @RequiresApi(Build.VERSION_CODES.O)
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_alarm_page)
        init()

        stopReminder.setOnClickListener {
            val intent = Intent(this, MainActivity::class.java)
            startActivity(intent)
        }
    }

    private fun init(){
        stopReminder = findViewById(R.id.stopReminder)
    }
}

我不知道出了什么问题..