MainActivity.kt
package com.cfsuman.kotlintutorials
import android.app.Activity
import android.app.NotificationChannel
import android.app.NotificationManager
import android.app.PendingIntent
import android.content.Context
import android.content.Intent
import android.os.Build
import android.os.Bundle
import android.widget.Button
import androidx.annotation.RequiresApi
import androidx.core.app.NotificationCompat
import androidx.core.app.NotificationManagerCompat
import androidx.core.app.RemoteInput
class MainActivity : Activity() {
@RequiresApi(Build.VERSION_CODES.S)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// get the context
val context = this
// get the widgets reference from XML layout
val button = findViewById<Button>(R.id.button)
// Create and register notification channel api 26+
val channelId = "My_Channel_ID"
val notificationId = 1
createNotificationChannel(channelId)
// button click listener
button.setOnClickListener {
// The direct reply action, introduced
// in Android 7.0 (API level 24)
// Create an instance of remote input builder
val remoteInput: RemoteInput = RemoteInput
.Builder("KEY_TEXT_REPLY")
.run {
setLabel("Write your message here")
build()
}
// Create an intent
val intent = Intent(context, MyBroadcastReceiver::class.java)
intent.action = "REPLY_ACTION"
intent.putExtra("KEY_NOTIFICATION_ID", notificationId)
intent.putExtra("KEY_CHANNEL_ID", channelId)
intent.putExtra("KEY_MESSAGE_ID", 2)
// Create a pending intent for the reply button
val replyPendingIntent: PendingIntent = PendingIntent
.getBroadcast(
context,
101,
intent,
PendingIntent.FLAG_MUTABLE or
PendingIntent.FLAG_UPDATE_CURRENT
)
// Create reply action and add the remote input
val action: NotificationCompat.Action = NotificationCompat
.Action.Builder(
R.drawable.ic_action_backup,
"Reply",
replyPendingIntent
).addRemoteInput(remoteInput)
.setAllowGeneratedReplies(true)
.build()
// Build a notification and add the action
val builder = NotificationCompat.Builder(context, channelId)
.setSmallIcon(R.drawable.ic_action_help_outline)
.setContentTitle("Jones")
.setContentText("Hello! how are you?")
.addAction(action)
// Finally, issue the notification
NotificationManagerCompat.from(context).apply {
notify(notificationId, builder.build())
}
}
}
// create notification channel
private fun createNotificationChannel(channelId:String) {
// Create the NotificationChannel,
// but only on API 26+ (Android 8.0) because
// the NotificationChannel class is new and
// not in the support library
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
val name = "My Channel"
val channelDescription = "Channel Description"
val importance = NotificationManager.IMPORTANCE_DEFAULT
val channel = NotificationChannel(channelId,name,importance)
channel.apply {
description = channelDescription
}
// Finally register the channel with system
val notificationManager = getSystemService(
Context.NOTIFICATION_SERVICE) as NotificationManager
notificationManager.createNotificationChannel(channel)
}
}
}
activity_main.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"
android:background="#DCDCDC"
android:id="@+id/rootLayout"
android:padding="24dp">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show Notification"
android:textAllCaps="false"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
MyBroadcastReceiver.kt
package com.cfsuman.kotlintutorials
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.widget.Toast
import androidx.core.app.NotificationCompat
import androidx.core.app.NotificationManagerCompat
import androidx.core.app.RemoteInput
class MyBroadcastReceiver: BroadcastReceiver() {
override fun onReceive(context: Context?, intent: Intent?) {
intent?.apply {
if ("REPLY_ACTION" == action){
val message = replyMessage(this)
val messageId = getIntExtra("KEY_MESSAGE_ID",0)
Toast.makeText(context,"$messageId : $message",
Toast.LENGTH_LONG).show()
}
context?.apply {
val notificationId = getIntExtra("KEY_NOTIFICATION_ID",0)
val channelId = getStringExtra("KEY_CHANNEL_ID")
// Build a notification and add the action
val builder = channelId?.let {
NotificationCompat.Builder(this, it)
.setSmallIcon(R.drawable.ic_action_help)
.setContentTitle("Title")
.setContentText("message sent!")
}
// Finally, issue the notification
NotificationManagerCompat.from(this).apply {
if (builder != null) {
notify(notificationId, builder.build())
}
}
}
}
}
private fun replyMessage(intent: Intent): CharSequence? {
val remoteInput = RemoteInput.getResultsFromIntent(intent)
return remoteInput?.getCharSequence("KEY_TEXT_REPLY")
}
}
AndroidManifest.xml [add]
<receiver android:name=".MyBroadcastReceiver"/>
AndroidManifest.xml [Permission]
<uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
