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/// this is part of a stateful widget, that uses Isolates.compute to do a heavy task, in this case download and 
/// display an image from internet in parallel.
/// this will help to improve performance for our scenario when a chat messages screen should display all messages

class _MessagesImageState extends State<MessagesImage> {
  @override
  Widget build(BuildContext context) {
    return InkWell(
      onTap: () {
        // onTap logic

cdmunoz

// Complete the maxInversions function below.
fun maxInversions(prices: Array<Int>): Long {
    var inversionsCounter = 0L
    val arraySize = prices.size

    for (i in 0 until arraySize - 1) {
        var smaller = 0 //smaller elements on right
        for (j in i + 1 until arraySize) {
            if (prices[i] > prices[j]) {
                smaller++

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/*
 *  Copyright 2017 Google Inc.
 *
 *  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

cdmunoz

sealed class Result<out T : Any> {
    data class Success<out T : Any>(val data: T) : Result<T>()
    data class Error(val exception: Exception) : Result<Nothing>()
    object InProgress : Result<Nothing>()

    val extractData: T?
        get() = when (this) {
            is Success -> data
            is Error -> null
            is InProgress -> null

cdmunoz

public static Matcher<View> textInputLayoutwithItemHint(final String matcherText) {
    return new BoundedMatcher<View, TextInputLayout>(TextInputLayout.class) {

        @Override
        public void describeTo(Description description) {
            description.appendText("with item hint: " + matcherText);
        }

        @Override
        protected boolean matchesSafely(TextInputLayout editTextField) {

cdmunoz

fun testNetworkModule(baseUrl: String) = module {
    single { provideTestRetrofit(baseUrl) }
    single { provideTestApiService(get(), ApiService::class.java) }
}

fun provideTestRetrofit(baseUrl: String): Retrofit =
    Retrofit.Builder().baseUrl(baseUrl)
        .addConverterFactory(GsonConverterFactory.create()).build()

fun provideTestApiService(retrofit: Retrofit, apiService: Class<ApiService>) =

cdmunoz

class NasaRoverPhotosApp : Application() {

    override fun onCreate() {
        super.onCreate()
        Timber.plant(DebugTree())
        startKoin {
            androidContext(this@NasaRoverPhotosApp)
            modules(appModules)
        }
    }

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val viewModelModule = module {
    viewModel { PhotosViewModel(get()) }
}

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val repositoryModule = module {
    factory {
        PhotosRepository(get())
    }
}

cdmunoz

val networkModule = module {
    single { provideOkHttpClient() }
    single { provideRetrofit(get()) }
    single { provideApiService(get(), ApiService::class.java) }
}

fun provideOkHttpClient(): OkHttpClient = OkHttpClient.Builder().build()

fun provideRetrofit(okHttpClient: OkHttpClient): Retrofit =
    Retrofit.Builder().baseUrl(BuildConfig.BASE_URL)