dtrailin

some_view.setOnClickListener(object : View.OnClickListener {
   override fun onClick(view: View) {
       println("clicked!")
   }
})

dtrailin

val parent = node.getParent() ?: return null
val name = node.getName() ?: throw IllegalArgumentException("...")

dtrailin

if (x is String){
   println(x)
}
// can be replaced with
(x as? String)?.let { println(x) }

dtrailin

school?.students?.let { doSomething(it.get(“billy”)) }

dtrailin

val school : School = null

if (school != null && school.students != null){
    doSomething(school.students.get(“billy”))	
}

dtrailin

package rx.plugins;

public class RxJavaTestPlugins extends RxJavaPlugins {
   RxJavaTestPlugins() {
       super();
   }

   public static void resetPlugins(){
       getInstance().reset();
   }

dtrailin

public class TestApplication extends BaseApplication implements TestLifecycleApplication {

       @Override
       public void onCreate() {
           setupRxSchedulers();
           super.onCreate();
       }

       private void setupRxSchedulers() {
           RxJavaTestPlugins.resetPlugins();

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@Test
public void testUsingTestSchedulers() throws Exception {
   TestScheduler scheduler = new TestScheduler();
   TestSubscriber<Long> testSubscriber = new TestSubscriber<>();
   Observable.interval(1, TimeUnit.SECONDS, scheduler).take(5).observeOn(scheduler).subscribeOn(scheduler).subscribe(testSubscriber);
   testSubscriber.assertNoValues();
   scheduler.advanceTimeBy(2, TimeUnit.SECONDS);
   testSubscriber.assertReceivedOnNext(Arrays.asList(0L, 1L));
   scheduler.advanceTimeBy(10, TimeUnit.SECONDS);
   testSubscriber.assertCompleted();

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@Test
public void testUsingTestSubscriber() throws Exception {
   TestSubscriber<Integer> testSubscriber = new TestSubscriber<>();
   Observable.just(1).subscribe(testSubscriber);
   testSubscriber.assertNoErrors();
   testSubscriber.assertReceivedOnNext(Arrays.asList(1));
}

dtrailin

List<T> myList  = myObservable.toList().toBlocking().single()
assertThat(myList.isEmpty()).is(false)