Notification Using Kotlin & JetPack

Here I explain..

1. Normal Notification
2. Notification with button Action
3. The notification includes EditText Reply

1. Create a project including center aligned Button.
2. Initialize channel ID here I used the same as my package name append with few characters and Notification Manager.

private val channelID = "com.example.notifications.channel1"
private var notificationManager: NotificationManager? = null

3. onCreate() method.

@SuppressLint("MissingInflatedId")
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
    val button: Button = findViewById(R.id.button)
    createNotification(channelID,"DEMO!","THIS IS.")
    button.setOnClickListener {
        displayNotification()
    }
}

Inside onCreate 2 fun is there createNotification() for creating Notification and displayNotification() for display

4. Fun createNotification()

private fun createNotification(id:String,name:String,channelDescription:String){
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
        val importance = NotificationManager.IMPORTANCE_HIGH
        val channel = NotificationChannel(id,name,importance).apply {
            description = channelDescription
        }
        notificationManager?.createNotificationChannel(channel)

    }
}

5. Fun displayNotification()

@SuppressLint("NotificationPermission")
private fun displayNotification(){
    val notificationId= 45
    val notification : Notification = NotificationCompat.Builder(this,channelID)
        .setContentTitle("Demo Title")
        .setContentText("This is a Demo notification")
        .setSmallIcon(android.R.drawable.ic_dialog_info)
        .setAutoCancel(true)
        .setPriority(NotificationCompat.PRIORITY_HIGH).build()
    notificationManager?.notify(notificationId,notification)
}

as a Result, we get a simple Notification.

←-For SetUp OnTap Navigation On Navigation →

make a few changes on displayNotification()

private fun displayNotification(){
    ///Intent
    val tapResultIntent = Intent(this,SecondActivity::class.java)
    val pendingIntent:PendingIntent = PendingIntent.getActivity(
        this,
        0,
        tapResultIntent,
        PendingIntent.FLAG_UPDATE_CURRENT
    )
    val notificationId= 45
    val notification : Notification = NotificationCompat.Builder(this,channelID)
        .setContentTitle("Demo Title")
        .setContentText("This is a Demo notification")
        .setSmallIcon(android.R.drawable.ic_dialog_info)
        .setAutoCancel(true)
        .setContentIntent(pendingIntent)
        .setPriority(NotificationCompat.PRIORITY_HIGH).build()
    notificationManager?.notify(notificationId,notification)
}

←- Add Button On Navigation PopUP →

changes on displayNotification()

private fun displayNotification(){
    val intent1 = Intent(this,DetailsActivity::class.java)
    val pendingIntent1:PendingIntent =PendingIntent.getActivity(this,
        0,
        intent1,
        PendingIntent.FLAG_UPDATE_CURRENT
        )
    val action1 : NotificationCompat.Action = NotificationCompat.Action.Builder(0,"Details",pendingIntent1).build()

    val intent2 = Intent(this,SettingsActivity::class.java)
    val pendingIntent2:PendingIntent =PendingIntent.getActivity(this,
        0,
        intent2,
        PendingIntent.FLAG_UPDATE_CURRENT
    )
    val action2 : NotificationCompat.Action = NotificationCompat.Action.Builder(1,"Settings",pendingIntent2).build()
    val notificationId= 45
    val notification : Notification = NotificationCompat.Builder(this,channelID)
        .setContentTitle("Demo Title")
        .setContentText("This is a Demo notification")
        .setSmallIcon(android.R.drawable.ic_dialog_info)
        .setAutoCancel(true)
        .addAction(action1)
        .addAction(action2)
        .setPriority(NotificationCompat.PRIORITY_HIGH).build()
    notificationManager?.notify(notificationId,notification)
}

Add two buttons on Navigation(Details and Settings).

←- Add EditText On Navigation PopUP And Pass The Text to Another Page→

private val KEY_REPLY = "key_reply"

Initialize a Key for passing text data at first

@SuppressLint("NotificationPermission")
private fun displayNotification(){
    //renote action for reply input
    val remoteInputs : RemoteInput = RemoteInput.Builder(KEY_REPLY).run {
        setLabel("Insert your name here...!")
        build()
    }
    //remenber to add android x package of REmoteInput
    val replyAction : NotificationCompat.Action = NotificationCompat.Action.Builder(
        0,"REPLEY",pendingIntent2
    ).addRemoteInput(remoteInputs).build()

    val intent2 = Intent(this,SettingsActivity::class.java)
    val pendingIntent2:PendingIntent =PendingIntent.getActivity(this,
        0,
        intent2,
        PendingIntent.FLAG_UPDATE_CURRENT
     )

    val notificationId= 45
    val notification : Notification = NotificationCompat.Builder(this,channelID)
        .setContentTitle("Demo Title")
        .setContentText("This is a Demo notification")
        .setSmallIcon(android.R.drawable.ic_dialog_info)
        .setAutoCancel(true)
        .addAction(replyAction)
        .setPriority(NotificationCompat.PRIORITY_HIGH).build()
    notificationManager?.notify(notificationId,notification)
}

Here we pass text Inside EditText to SettingsActivity.kt

SettingsActivity.kt

package com.example.notifications
import android.app.NotificationManager
import android.app.RemoteInput
import android.content.Context
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.TextView
import androidx.core.app.NotificationCompat

class SettingsActivity : AppCompatActivity() {
    private val KEY_REPLY = "key_reply"
    lateinit var textView : TextView
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_settings)
        textView = findViewById<TextView>(R.id.textView2)
        receiveInput()
    }

    private fun receiveInput(){
        val channelID = "com.example.notifications.channel1"
        val notificationId= 45
        val intent = this.intent
        val remoteInput = RemoteInput.getResultsFromIntent(intent)
        if(remoteInput!=null){
            val inputString = remoteInput.getCharSequence(KEY_REPLY).toString()
            textView.text = inputString.toString()
            val replyNotification= NotificationCompat.Builder(this,channelID).setSmallIcon(android.R.drawable.ic_dialog_info)
                .setContentText("Your reply received").build()
            val notificationManager : NotificationManager =
                getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
            notificationManager.notify(notificationId,replyNotification)

        }
    }

}

GitHUb : https://github.com/Arjun-00/Notifications