cavega

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"

cavega

// ** Kotlin implementation **
// Singleton with inner trait
object LastFmManager {

    public trait TopArtistsFetchEvent {
        public fun topArtistsFetchSucceeded(artists: List<LastFmArtist>)
        public fun topArtistsFetchFailed(throwable: Throwable)
    }
    
    // Other logic here

cavega

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.0"

    defaultConfig {
        applicationId "com.cavega.kotlinmusings"
        minSdkVersion 16

cavega

Observable.combineLatest(
    ApiProvider.requestSource1(param1),
    ApiProvider.requestSource2(param2),
            this::combinedResponses)
            .map(responseObject -> saveResponse(responseObject, context))
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(responseObject -> onResponseReceived(responseObject, listener),
                      null != errorCallback ? errorCallback : this::onFetchObjectFailed);