smhdk

..
buildscript {

    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'

smhdk

..................
// Project build.gradle

buildscript {...}

allprojects {...}

// This block encapsulates custom properties and makes them available to all
// modules in the project.
ext {

smhdk

apply plugin: 'com.android.application'
android {
  compileSdkVersion 26
  buildToolsVersion "27.0.3"
  defaultConfig {
    applicationId 'com.example.myapp'
    minSdkVersion 15
    targetSdkVersion 26
    versionCode 1
    versionName "1.0"

smhdk

res/color/button_text.xml:

<?xml version="1.0" encoding="utf-8"?>

///res/color/button_text.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true"
          android:color="#ffff0000"/> <!-- pressed -->
    <item android:state_focused="true"

smhdk

private fun setField(targetClass: Class<*>, instance: Any, fieldName: String, value: Any) {
        try {
            val field = targetClass.getDeclaredField(fieldName)
            field.isAccessible = true
            field.set(instance, value)
        } catch (e: NoSuchFieldException) {
            e.printStackTrace()
        } catch (e: IllegalAccessException) {
            e.printStackTrace()
        }

smhdk

    //Observable
    val getObservable = Observable.just("X", "Y", "Z")

    //Observer
    val getObserver = object : Observer<String> {
        override fun onComplete() {
            println("onComplete")
        }

        override fun onSubscribe(d: Disposable) {

smhdk

val observer = object : Observer<String> {
        override fun onComplete() {

        }

        override fun onSubscribe(d: Disposable) {

        }

        override fun onNext(t: String) {

smhdk

 val singleObserver = object : SingleObserver<String> {
        override fun onSuccess(t: String) {
            
        }

        override fun onSubscribe(d: Disposable) {
            
        }

        override fun onError(e: Throwable) {

smhdk

val maybeObserver = object : MaybeObserver<String> {
        override fun onSuccess(t: String) {
            
        }

        override fun onComplete() {
            
        }

        override fun onSubscribe(d: Disposable) {

smhdk

 val completableObserver = object : CompletableObserver {
        override fun onComplete() {

        }

        override fun onSubscribe(d: Disposable) {

        }

        override fun onError(e: Throwable) {