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#Intro

Kotlin is a new programming language for the JVM. It produces Java bytecode, supports Android and generates JavaScript. The latest version of the language is Kotlin M5.3

Kotlin project website is at kotlin.jetbrains.org.

All the codes here can be copied and run on Kotlin online editor.

Let's get started.

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public class AndroidApplication extends MultiDexApplication {
    public static final String TAG = AndroidApplication.class.getSimpleName();

    @Override
    public void onCreate() {
        super.onCreate();
        registerComponentCallbacks(new ComponentCallback());
    }

    private class ComponentCallback implements ComponentCallbacks2 {

antslava

private class HttpInterceptor implements Interceptor {

	@Override
	public Response intercept(Chain chain) throws IOException {
		Request request = chain.request();

		//Build new request
		Request.Builder builder = request.newBuilder();
		builder.header("Accept", "application/json"); //if necessary, say to consume JSON
		

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import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Looper;

import rx.Observable;
import rx.Scheduler;

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Download the following ZIPs:
    
    ARM Translation Installer v1.1 (http://www.mirrorcreator.com/files/0ZIO8PME/Genymotion-ARM-Translation_v1.1.zip_links)
    
    Download the correct GApps for your Android version:
      Google Apps for Android 5.0 (https://www.androidfilehost.com/?fid=95784891001614559 - gapps-lp-20141109-signed.zip)
      Google Apps for Android 4.4.4 (https://www.androidfilehost.com/?fid=23501681358544845 - gapps-kk-20140606-signed.zip)
      Google Apps for Android 4.3 (https://www.androidfilehost.com/?fid=23060877490000124 - gapps-jb-20130813-signed.zip)
      Google Apps for Android 4.2 (https://www.androidfilehost.com/?fid=23060877490000128 - gapps-jb-20130812-signed.zip)
      Google Apps for Android 4.1 (https://www.androidfilehost.com/?fid=22979706399755082 - gapps-jb-20121011-signed.zip)

antslava

package com.ryanharter.mediaroute.widgets;

import android.content.Context;
import android.support.v7.app.MediaRouteActionProvider;
import android.support.v7.app.MediaRouteButton;

/**
 * A MediaRouteActionProvider that allows the use of a ThemeableMediaRouteButton.
 */
public class ThemeableMediaRouteActionProvider extends MediaRouteActionProvider {

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package com.yourapp;

import java.io.File;

public final class RootStatus {

    private static RootStatus instance;

    private final boolean rooted;

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<!-- You can change the parent around to whatever you normally use -->
<style name="DebugColors" parent="Theme.AppCompat">

    <!-- System colors -->
    <item name="android:colorForeground">#440000</item>
    <item name="android:colorForegroundInverse">#004400</item>
    <item name="android:colorBackground">#444400</item>
    <item name="android:colorBackgroundCacheHint">#440044</item>

    <item name="android:textColorPrimary">#FFFF00</item>

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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

So you're curious in learning this new thing called (Functional) Reactive Programming (FRP).

Learning it is hard, even harder by the lack of good material. When I started, I tried looking for tutorials. I found only a handful of practical guides, but they just scratched the surface and never tackled the challenge of building the whole architecture around it. Library documentations often don't help when you're trying to understand some function. I mean, honestly, look at this:

Rx.Observable.prototype.flatMapLatest(selector, [thisArg])

Projects each element of an observable sequence into a new sequence of observable sequences by incorporating the element's index and then transforms an observable sequence of observable sequences into an observable sequence producing values only from the most recent observable sequence.

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/*
 * Copyright (C) 2014 Chris Banes
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software