Pro Android with Kotlin

Figure 8-3. Reply notification

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CHAPTER 8: APIs
Since API levels below 24 are not able to provide that, your app should not rely on this 
functionality. Usually this is easy to achieve. For API levels 23 or lower, the activity called by 
tapping a notification can of course contain a facility to reply if needed.
A method that issues a notification with reply functionality might look like this:
fun directReply(view:View) {
// Key for the string that's delivered in the
// action's intent.
val KEY_TEXT_REPLY = "key_text_reply"
val remoteInput = RemoteInput.Builder(KEY_TEXT_REPLY)
.setLabel("Reply label")
.build()
// Make sure this broadcast receiver exists
val CONVERSATION_ID = 1
val messageReplyIntent =
Intent(this, MyReceiver2::class.java)
messageReplyIntent.action = "com.xyz2.MAIN"
messageReplyIntent.putExtra("conversationId",
CONVERSATION_ID)
// Build a PendingIntent for the reply
// action to trigger.
val replyPendingIntent = PendingIntent.
getBroadcast(applicationContext,
CONVERSATION_ID,
messageReplyIntent,
PendingIntent.FLAG_UPDATE_CURRENT)
// Create the reply action and add the remote input.
val action = NotificationCompat.Action.Builder(
... a resource id for an icon ...,
"Reply", replyPendingIntent)
.addRemoteInput(remoteInput)
.build()
val builder = NotificationCompat.Builder(this,
NOTIFICATION_CHANNEL_ID)
.setSmallIcon(... a resource id for an icon ...)
.setContentTitle("Title")
.setContentText("Content Content Content ...")
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
// add a reply action button
.addAction(action)
buildChannel(NOTIFICATION_CHANNEL_ID)
val notificationManager =
NotificationManagerCompat.from(this)
notificationManager.notify(
NOTIFICATION_ID, builder.build())
}

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