The ability to refer to a view directly by it’s ID/name in Kotlin is called “synthetic properties” and it is a feature of a project plugin called Kotlin Android Extensions. Google and JetBrains decided to deprecate Kotlin Android Extensions, meaning they no longer support it, and discourage you from using it. Ever since it was … Read more
Run the Gradle build with a command line argument –warning-mode=all to see what exactly the deprecated features are. It will give you a detailed description of found issues with links to the Gradle docs for instructions how to fix your build. Adding –stacktrace to that, you will also be able to pinpoint where the warning … Read more
Arrays and lists (represented by List<T> and its subtype MutableList<T>) have many differences, here are the most significant ones: Array<T> is a class with known implementation: it’s a sequential fixed-size memory region storing the items (and on JVM it is represented by Java array). List<T> and MutableList<T> are interfaces which have different implementations: ArrayList<T>, LinkedList<T> … Read more
With Android Studio 3.0 You don’t need to install any plugin to convert java code to kotlin code. Now, Google is officially supporting Kotlin language. Android Studio Menu -> Code -> Convert Java File to Kotlin File Before Android Studio 3.0 If you are using older Android Studio ( which is below version 3.0 ) … Read more
I noticed you filed a bug here: https://issuetracker.google.com/204328119, but I also wanted to update this answer for other future people reading this issue on SO. The core issue is that you are starting collection on Paging before ViewPager is ready to start binding this items. You should use lifecycleScope.launchWhenCreated instead of lifecycleScope.launc to fix this: … Read more
A description of how to apply the watershed algorithm in OpenCV is here, although it is in Python. The documentation also contains some potentially useful examples. Since you already have a binary image, all that’s left is to apply the Euclidean Distance Transform (EDT) and the watershed function. So instead of Imgproc.grabCut(srcImage, firstMask, rect, bg, … Read more
After some tinkering for a while with different solutions i found out that one must create a notification channel in Android 8.1 and above. private fun startForeground() { val channelId = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { createNotificationChannel(“my_service”, “My Background Service”) } else { // If earlier version channel ID is not used // https://developer.android.com/reference/android/support/v4/app/NotificationCompat.Builder.html#NotificationCompat.Builder(android.content.Context) “” … Read more
In your code result is not changing, its var properties are changing. Refer comments below: fun copyAddress(address: Address): Address { val result = Address() // result is read only result.name = address.name // but not their properties. result.street = address.street // … return result } val is same as the final modifier in java. As … Read more
Between execution of left != null and queue.add(left) another thread could have changed the value of left to null. To work around this you have several options. Here are some: Use a local variable with smart cast: val node = left if (node != null) { queue.add(node) } Use a safe call such as one … Read more