Android progress notifications in Kotlin

Android progress notifications in Kotlin

Progress notifications are used in Android to indicate the progress of an ongoing operation. Here's how to create and update a progress notification using Kotlin in Android:

1. Add the necessary permission

Ensure you have the FOREGROUND_SERVICE permission in the AndroidManifest.xml if you intend to show the notification from a foreground service:

<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />

2. Create a Notification Channel

It's good practice to create a notification channel for Android 8.0 (API level 26) and above:

private fun createNotificationChannel(channelId: String, channelName: String) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { val importance = NotificationManager.IMPORTANCE_LOW val channel = NotificationChannel(channelId, channelName, importance).apply { description = "Channel description" } val notificationManager: NotificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager notificationManager.createNotificationChannel(channel) } }

Call this method in your onCreate():

createNotificationChannel("progress_channel", "Progress Notifications")

3. Display a Progress Notification

Use the NotificationCompat.Builder class to build and display the notification:

fun showProgressNotification(progress: Int) { val channelId = "progress_channel" val notification = NotificationCompat.Builder(this, channelId).apply { setContentTitle("Download") setContentText("Download in progress") setSmallIcon(R.drawable.ic_notification) setPriority(NotificationCompat.PRIORITY_LOW) setOngoing(true) setProgress(100, progress, false) // here 100 denotes the max progress, and the second parameter is the current progress }.build() val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager notificationManager.notify(1, notification) }

To update the progress, call showProgressNotification() with the updated progress value:

for (i in 0..100) { showProgressNotification(i) Thread.sleep(100) // just for demonstration purposes, do not use Thread.sleep in production }

4. Complete the Notification

Once the operation is complete, you can update the notification to indicate completion:

fun completeNotification() { val channelId = "progress_channel" val notification = NotificationCompat.Builder(this, channelId).apply { setContentTitle("Download") setContentText("Download complete") setSmallIcon(R.drawable.ic_notification) setPriority(NotificationCompat.PRIORITY_LOW) setOngoing(false) setProgress(0, 0, false) // Remove progress bar }.build() val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager notificationManager.notify(1, notification) }

Note:

Remember to properly manage the lifecycle of any services or background tasks associated with your notification. If you're doing work in the background, it's also recommended to use a ForegroundService combined with progress notifications to ensure the task completes.

Examples

  1. MotionLayout in Android using Kotlin example:

    Include the MotionLayout in your XML layout:

    <androidx.constraintlayout.motion.widget.MotionLayout android:id="@+id/motionLayout" android:layout_width="match_parent" android:layout_height="match_parent" app:layoutDescription="@xml/motion_scene"> <!-- Add your UI elements here --> </androidx.constraintlayout.motion.widget.MotionLayout>

    Create a motion_scene.xml file in res/xml/ to define your animation scenes.

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