How to create empty constructor for data class in Kotlin Android
I have 10+ variables declared in Kotlin data class, and I would like to create an empty constructor for it like how we … Read more
kotlin
NullPointerException when trying to access views in a Kotlin fragment
How to use Kotlin Android Extensions with Fragments? If I use them inside onCreateView(), I get this NullPointerException exception: Caused by: java.lang.NullPointerException: Attempt … Read more
Format in Kotlin string templates
Kotlin has an excellent feature called string templates. val i = 10 val s = “i = $i” // evaluates to “i = … Read more
How to get the current index in for each Kotlin
How to get the index in a for each loop? I want to print numbers for every second iteration For example for (value … Read more
What is the Kotlin double-bang (!!) operator?
I’m converting Java to Kotlin with Android Studio. I get double bang after the instance variable. What is the double bang and more … Read more
How can I generate random number in specific range in Android? [duplicate]
This question already has answers here: How do I generate random integers within a specific range in Java? (70 answers) Closed 2 years … Read more
Android Get Current timestamp?
I want to get the current timestamp like that : 1320917972 int time = (int) (System.currentTimeMillis()); Timestamp tsTemp = new Timestamp(time); String ts … Read more
Difference between List and Array types in Kotlin
What is the difference between List and Array types? It seems can make same operations with them (loops, filter expression, etc..), is there … Read more
Extend data class in Kotlin
Data classes seem to be the replacement to the old-fashioned POJOs in Java. It is quite expectable that these classes would allow for … Read more
How to make primary key as autoincrement for Room Persistence lib
I am creating an Entity (Room Persistence Library) class Food, where I want to make foodId as autoincrement. @Entity class Food(var foodName: String, … Read more