enter image description here

Hi all i am new to kotlin and android platform. I wish to send notification when i click on button "click her for notification" but it not working when i click on button getting message shown in image. I tried .apk file on real device but still same problem. I am using API is 31. MainActivity.kt

package com.example.firstapp

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.Toast
import androidx.core.app.NotificationCompat
import androidx.core.app.NotificationManagerCompat

class MainActivity : AppCompatActivity()
{
    override fun onCreate(savedInstanceState: Bundle?) 
{
        val CHANNEL_ID= "normal data"
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val notifyy = findViewById<Button>(R.id.note);
        notifyy.setOnClickListener {
            //Toast.makeText(applicationContext,"this is S!",Toast.LENGTH_SHORT).show()
            var builder = NotificationCompat.Builder(this, CHANNEL_ID)
            builder.setSmallIcon(R.drawable.notification_icon)
            builder .setContentTitle("My notification")
            builder.setContentText("Much longer text that cannot fit one line...")
            builder.setStyle(NotificationCompat.BigTextStyle().bigText("Much longer text that cannot fit one line"))
            builder.setPriority(NotificationCompat.PRIORITY_DEFAULT)
            with(NotificationManagerCompat.from(this)) {
                // notificationId is a unique int for each notification that you must define
                val notificationId:Int=11
                notify(notificationId, builder.build())
            }

        }


    }
}

ActivityMain.xml

<?xml version="1.0" encoding="utf-8"?>`   `
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@ id/textView"
        android:layout_width="127dp"
        android:layout_height="86dp"
        android:text="hellow sharad"
        android:textAppearance="@style/TextAppearance.AppCompat.Body1"
        android:textColor="#E91E63"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.32"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.137" />

    <Button
        android:id="@ id/note"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="click here for notification"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.687"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.669" />

</androidx.constraintlayout.widget.ConstraintLayout>

CodePudding user response：

Android Notifications

Check out this repo of mine. I made it specifically for creating notifications in android.

CodePudding user response：

You have to first create the Notification channel then only notification posted on the channel(in your case channel is val CHANNEL_ID = "normal data") will be shown

val chanel = NotificationChannel(CHANNEL_ID, name /* name of your channel */, importance).apply {
    description = /* description text of the channel */
}

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    // Notification channnel is only supported above O

    // Register the channel with the system
    val appContext = /* your application context */    
    val notificationManager: NotificationManager = appContext.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
    notificationManager.createNotificationChannels(listOf(chanel))
}