这是我的代码，它只显示一个简单的通知，我怎么能让它也显示一个弹出或抬头通知。
抱歉，如果这是如此简单的帮助，如果你知道什么，
Notification.kt
`

package com.example.notifkos

import android.app.NotificationManager
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.os.Build
import androidx.core.app.NotificationCompat

const val notificationID = 1
const val channelID = "channel1"
const val titleExtra = "titleExtra"
const val messageExtra = "messageExtra"

class Notification : BroadcastReceiver()
{
    override fun onReceive(context: Context, intent: Intent)
    {
        val importance = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            NotificationManager.IMPORTANCE_HIGH
        } else {
            TODO("VERSION.SDK_INT < N")
        }
        val notification = NotificationCompat.Builder(context, channelID)

            .setSmallIcon(R.drawable.ic_launcher_foreground)
            .setContentTitle(intent.getStringExtra(titleExtra))
            .setContentText(intent.getStringExtra(messageExtra))
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .build()

        val  manager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        manager.notify(notificationID, notification)
    }

字符串
第一个月

package com.example.notifkos

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.app.*
import android.content.Context
import android.content.Intent
import android.os.Build
import androidx.annotation.RequiresApi
import androidx.core.app.NotificationCompat
import com.example.notifkos.databinding.ActivityMainBinding
import java.util.*

class MainActivity : AppCompatActivity()
{
    private lateinit var binding : ActivityMainBinding

    @RequiresApi(Build.VERSION_CODES.M)
    override fun onCreate(savedInstanceState: Bundle?)
    {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            createNotificationChannel()
        }
        binding.submitButton.setOnClickListener { scheduleNotification() }
    }

    @RequiresApi(Build.VERSION_CODES.M)
    private fun scheduleNotification()
    {
        val intent = Intent(applicationContext, Notification::class.java)
        val title = binding.titleET.text.toString()
        val message = binding.messageET.text.toString()
        intent.putExtra(titleExtra, title)
        intent.putExtra(messageExtra, message)

        val pendingIntent = PendingIntent.getBroadcast(
            applicationContext,
            notificationID,
            intent,
            PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
        )

        val alarmManager = getSystemService(Context.ALARM_SERVICE) as AlarmManager
        val time = getTime()
        alarmManager.setExactAndAllowWhileIdle(
            AlarmManager.RTC_WAKEUP,
            time,
            pendingIntent
        )
        showAlert(time, title, message)
    }

    private fun showAlert(time: Long, title: String, message: String)
    {
        val importance = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            NotificationManager.IMPORTANCE_HIGH
        } else {
            TODO("VERSION.SDK_INT < N")
        }
        val date = Date(time)
        val dateFormat = android.text.format.DateFormat.getLongDateFormat(applicationContext)
        val timeFormat = android.text.format.DateFormat.getTimeFormat(applicationContext)

        AlertDialog.Builder(this)
            .setTitle("Notification Scheduled")
            .setMessage(
                "Title: " + title +
                        "\nMessage: " + message +
                        "\nAt: " + dateFormat.format(date) + " " + timeFormat.format(date))
            .setPositiveButton("Okay"){_,_ ->}
            .show()
    }

    @RequiresApi(Build.VERSION_CODES.M)
    private fun getTime(): Long
    {
        val minute = binding.timePicker.minute
        val hour = binding.timePicker.hour
        val day = binding.datePicker.dayOfMonth
        val month = binding.datePicker.month
        val year = binding.datePicker.year

        val calendar = Calendar.getInstance()
        calendar.set(year, month, day, hour, minute)
        return calendar.timeInMillis
    }

    @RequiresApi(Build.VERSION_CODES.O)
    private fun createNotificationChannel()
    {
        val name = "Notif Channel"
        val desc = "A Description of the Channel"
        val importance = NotificationManager.IMPORTANCE_DEFAULT
        val channel = NotificationChannel(channelID, name, importance)
        channel.description = desc
        val notificationManager = getSystemService(NOTIFICATION_SERVICE) as NotificationManager
        notificationManager.createNotificationChannel(channel)
    }

}

型
“好吧，那就再多加一些细节吧。比如，你想完成什么，你是怎么做的，你在这个方法上发现了什么困难，你尝试过的其他方法，等等。总之，没有代码不是一个好问题，只有代码也不是。寻找平衡点！
我什么都拿不到
我已经阅读了android stuio文档，所以请不要告诉我阅读，请