118: Flutter and cross platform development with GDE Eugenio Marletti – Part 1

In this episode, we dive into one of our most requested topics and highly anticipated ones – Flutter.

To help us understand Flutter in-depth, we talk to Flutter’s GDE Eugenio Marletti. In Part 1 of this 2 part series, Eugenio helps us understand what flutter is, why it was created, how it works, some really cool features with Flutter and why an AndroidDev today should really give Flutter a good look.

We got so carried away in conversation, that we were forced to break this episode into two parts. Stay tuned for Part 2.

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116: Learning Kotlin – inline, noinline and crossinline

In this episode of learning kotlin, we look at 3 important keywords – inline, noinline and crossinline. The inline keyword is super common and you’ve probably run across this one at some point. What does it mean and when is it useful? We also look at the related but seldom used variants noinline and crossinline.

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Show Notes

Code Snippets:

Simple inlined function:

// Kotlin 
fun main(args: Array<String>) {
    functionA()
}

inline fun functionA() {
    println("awesomeness !")
}

Warning: Expected performance impact of inlining ‘public inline fun functionA() can be insignificant. Inlining works best for functions with lambda parameters

What the code looks like in Java:

public static final void main(String[] args) {
  String var1 = "awesomeness !";
  System.out.println(var1);
}

Function with lambda parameter:

fun main(args: Array<String>) {
    functionA({
        println("double awesomeness")
    })
}

inline fun functionA(lambda: () -> Unit) {
    println("awesomeness !")
    lambda.invoke()
}

What the code looks like in Java (without inline):

public static final void main(String[] args) {
    functionA(new Function() {
      println("double awesomeness")  
    });
}

public static final void functionA(Function0 lambda) {
    String var1 = "awesomeness !";
    System.out.println(var1);
    lambda.invoke();
}

What the code looks like in Java (with inline):

public static final void main(String[] args) {
    String var1 = "awesomeness !";
    System.out.println(var1);
    String var2 = "double awesomeness";
    System.out.println(var2);
}

Function0:

public interface Function0<out R> : Function<R> {
    /** Invokes the function. */
    public operator fun invoke(): R
}

Misc:

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115: Architecture Components with Akshay Chordiya

In this episode, we talk about the different parts of Android architecture components. We’ve had episodes on Room and the paging library, so in this one, we thought we’ll touch a little on Lifecycle Owners & Observers, ViewModels, and LiveData. Akshay Chordiya helps break it down. Listen on!

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Show Notes

Lifecycle

ViewModels

Code snippet for a ViewModelFactory:

class UserVMFactory(
        val user: MyUser
) : ViewModelProvider.Factory {
    override fun <T : ViewModel?> create(modelClass: Class<T>): T {
        return when {
            modelClass.isAssignableFrom(UserVM::class.java) ->
                UserVM(user) as T
            else -> throw IllegalArgumentException("Unknown ViewModel class")
        }
    }
}

LiveData

Misc

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113: Chatting with Pinterest’s Christina Lee

In this episode we catch up with a highly energetic but sick Christina Lee about the delightful details in the Pinterest app, delving with the dark side (Swift), giving live coding presentation talks and touching on some Kotlin details like covariance and contravariance. Listen on for a power-packed 40 minutes.

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Sponsors

  • Mapbox – Android developers don’t have to settle for a default same-map-no-matter-what option in their Android app. Mapbox offers complete map design control, allowing you to create beautiful custom maps to meet the needs of your Android users.

Show Notes

Sponsors

  • Mapbox – Android developers don’t have to settle for a default same-map-no-matter-what option in their Android app. Mapbox offers complete map design control, allowing you to create beautiful custom maps to meet the needs of your Android users.

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112: Effective Java v3 – Item #9 – Prefer try with resources to try finally

In this mini-fragment episode, Donn talks about Item #9 of the Effective Java (Third Edition) book – Prefer try with resources to try finally.

Please note, this episode references the third edition of the Effective Java book that recently came out. Previously we were doing the entire series on version 2, but we are now upgrading to version 3 of the book. We will not be re-doing any of the existing lessons, but if one was inserted in the mix, then we will do that lesson.

Listen on:

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Links

Sponsors

  • Mapbox – Android developers don’t have to settle for a default same-map-no-matter-what option in their Android app. Mapbox offers complete map design control, allowing you to create beautiful custom maps to meet the needs of your Android users.

Check them out today at mapbox.com/android

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