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@RunWith(RobolectricTestRunner.class)
@Config(manifest = TestConstants.MOBILE_ROBOLECTRIC_MANIFEST_PATH, sdk = 21)
public abstract class ParseTestBase {

  static boolean parseInit = false;

  @Before
  public void setup() throws ParseException {
    if (!parseInit) {
      Context context = ShadowApplication.getInstance().getApplicationContext();

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import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;
import org.hamcrest.Matcher;

/**
 * Hamcrest matchers for exceptions
 */
public class ExceptionMatchers {

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package com.beartooth.bronco;

import android.view.View;
import android.widget.TextView;

import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;
import org.hamcrest.Matcher;

/**

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    /**
     * Workaround for https://code.google.com/p/android/issues/detail?id=197341
     */
    private UUID byteSwappedUuid(UUID toSwap) {
        ByteBuffer buffer = ByteBuffer.allocate(16);
        buffer
            .putLong(toSwap.getLeastSignificantBits())
            .putLong(toSwap.getMostSignificantBits());
        buffer.rewind();
        buffer.order(ByteOrder.LITTLE_ENDIAN);

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public class WorkerThread extends Thread {

    private final LinkedBlockingQueue<Runnable> tasks;
    private final AtomicBoolean cancelled;
    private final AtomicBoolean safeCanceled;

    public WorkerThread() {
        this.tasks = new LinkedBlockingQueue<>();
        this.cancelled = new AtomicBoolean(false);
        this.safeCanceled = new AtomicBoolean(false);

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float freq = 440f;
    float sRate = 8000f;
    int numSamples = (int) (sRate * SINE_WAVE_DUR_SECS);
    float[] rawSamples = new float[numSamples];
    for (int i = 0; i < numSamples; ++i) {
      rawSamples[i] = (float) Math.sin(2.0 * Math.PI * i / (sRate / freq));
    }
    sineWaveSamples = new byte[numSamples * 2];
    int j = 0;
    for (float sample : rawSamples) {

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import UIKit

extension UIViewController {
  
  func registerForKeyboardNotifications() {
    let center = NotificationCenter.default
    center.addObserver(
        self,
        selector: #selector(keyboardDidShow(_:)),
        name: NSNotification.Name.UIKeyboardDidShow,

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try {
    PackageInfo pInfo = this.getPackageManager().getPackageInfo(getPackageName(), 0);
    String version = pInfo.versionName;
} catch (PackageManager.NameNotFoundException e) {
    e.printStackTrace();
}

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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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//
//  Binary.swift
//
//  Created by Jefferson Jones on 2/14/17.
//  Copyright © 2017 Jefferson Jones. All rights reserved.
//

import Foundation

class Binary {