kotlin Archives - Page 4 of 7

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 ...

May 21, 2022
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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 ...

May 20, 2022
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Format in Kotlin string templates

Kotlin has an excellent feature called string templates. val i = 10 val s = "i = $i" // evaluates to "i = ...

May 20, 2022
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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 ...

May 19, 2022
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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 ...

May 19, 2022
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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 ...

May 19, 2022
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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 ...

May 18, 2022
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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 ...

May 18, 2022
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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, ...

May 18, 2022
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