Description
Kotlin's scope functions (let, also, takeIf and takeUnless) and the safe call operator are now available to Java.
K2J-Compat alternatives and similar packages
Based on the "Kotlin" category.
Alternatively, view K2J-Compat alternatives based on common mentions on social networks and blogs.
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android-youtube-player
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Android Kotlin Samples
Some basic samples of Kotlin for Android -
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DeviceInfo-Sample
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Events Calendar
Events Calendar is a user-friendly library that helps you achieve a cool Calendar UI with events mapping. You can customise every pixel of the calendar as per your wish and still achieve in implementing all the functionalities of the native android calendar in addition with adding dots to the calendar which represents the presence of an event on the respective dates. It can be done easily, you are just a few steps away from implementing your own badass looking Calendar for your very own project! -
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CollapsingAvatarToolbarSample
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MVVM-To-Do-App
Android To-Do MVVM Architecture App written in Kotlin.(ViewModel, ROOM, Livedata, Coroutines)
Appwrite - The Open Source Firebase alternative introduces iOS support
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README
K2J-Compat
Bringing some of the Kotlin goodness to java
Installation with Android Gradle
// Add K2J-Compat dependency
dependencies {
implementation 'com.github.alexdochioiu:k2j-compat:1.0.1'
}
Usage
1. Kotlin's .let{ }
as .let()
import static com.github.alexdochioiu.k2jcompat.K2JCompat.take;
final String number = take("+44 77 1234 1234")
.let((it) -> "0" + it.substring(4)) // 077 1234 1234
.let((it) -> it.replaceAll(" ", "")) // 07712341234
.unwrap(); // unwraps the result to String
2. Kotlin's ?.let{ }
as ._let()
import static com.github.alexdochioiu.k2jcompat.K2JCompat.take;
final String nullStr = null;
final String number = take(nullStr)
._let((it) -> it.replaceAll(" ", "")) // this code will not run as 'it' is null
.unwrap(); // returns null
3. Kotlin's .also{ }
as .also()
import static com.github.alexdochioiu.k2jcompat.K2JCompat.take;
StringBuilder builder = new StringBuilder();
take(builder).also((it) -> it.append("Hello World!"));
4. Kotlin's ?.also{ }
as ._also()
import static com.github.alexdochioiu.k2jcompat.K2JCompat.take;
StringBuilder builder = null;
take(builder)._also((it) -> it.append("Hello World!"));
// Note: using 'also' instead of '_also' will cause a null pointer exception when trying to append
5. Kotlin's .takeIf{ }
as .takeIf()
import static com.github.alexdochioiu.k2jcompat.K2JCompat.take;
String phoneNumber = "889944";
Integer number = take(phoneNumber)
.takeIf((it) -> it.matches("[0-9]+"))
._let(Integer::parseInt)
.unwrap();
6. Kotlin's ?.takeIf{ }
as ._takeIf()
import static com.github.alexdochioiu.k2jcompat.K2JCompat.take;
String phoneNumber = null;
Integer number = take(phoneNumber)
._takeIf((it) -> it.matches("[0-9]+"))
._let(Integer::parseInt)
.unwrap();
Note: If you use int instead of Integer NPE will be thrown as java will try to unbox a null Integer to int
7. Kotlin's .takeUnless{ }
as .takeUnless()
Similar to takeIf but with inverted logic
8. Kotlin's ?.takeUnless{ }
as ._takeUnless()
Similar to _takeIf but with inverted logic
Known Limitations
- Unlike Kotlin, Java has primitive data types which get boxed/unboxed automatically into objects when needed. However, NPE is thrown when Java tries to unbox a null Object to a primitive data type. This cannot be solved so a custom lint will be created to add a warning when using primitives are used.
*Note that all licence references and agreements mentioned in the K2J-Compat README section above
are relevant to that project's source code only.