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public class MyDialogFragment extends DialogFragment {

    public interface DialogListener {
        void onFinishDialog(String data);
    }

    public MyDialogFragment() {}
    
    ...

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public class MainActivity extends FragmentActivity 
                                      implements MyDialogFragment.DialogListener {
  
  ...
  
  public void showMyDialog() {
    DialogFragment newFragment = new MyDialogFragment();
    newFragment.show(getSupportFragmentManager(), "idStringFragment");
  }

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/**
 * Enables TLS v1.2 when creating SSLSockets.
 *
 * For some reason, android supports TLS v1.2 from API 16, but enables it by
 * default only from API 20.
 * @link https://developer.android.com/reference/javax/net/ssl/SSLSocket.html
 * @see SSLSocketFactory
 */
class Tls12SocketFactory(private val delegate: SSLSocketFactory) : SSLSocketFactory() {

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fun OkHttpClient.Builder.enableTls12OnPreLollipop(): OkHttpClient.Builder {
    if (Build.VERSION.SDK_INT >= 16 && Build.VERSION.SDK_INT < 22) {
        try {
            val sc = SSLContext.getInstance("TLSv1.2")
            sc.init(null, null, null)
            this.sslSocketFactory(Tls12SocketFactory(sc.socketFactory))

            val cs = ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
                    .tlsVersions(TlsVersion.TLS_1_2)
                    .build()

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class LocationSettingDispatcher(activity: Activity) {

    private val maybeSubscribe = UpdateLocationMaybeSubscribe(activity)
    private val subject = PublishSubject.create<Boolean>()

    companion object {
        val REQUEST_CHECK_SETTINGS = 0x1
    }

    fun onActivityResult(requestCode: Int, resultCode: Int) {

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class LocationDeviceInteractor(activity: Activity) {

    private val provider = LocationServices.getFusedLocationProviderClient(activity)
    private val settingDispatcher = LocationSettingDispatcher(activity)

    private val lastLocationMaybe = Maybe.create<Location> { emitter ->
        try {
            provider.lastLocation.apply {
                addOnSuccessListener { location ->
                    if (location != null) emitter.onSuccess(location)

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@Singleton
class GooglePlayServicesAvailable @Inject constructor(private val context: Context) {

    companion object {
        private val PLAY_SERVICES_RESOLUTION_REQUEST = 4948
    }

    sealed class Result {
        object True : Result()
        object False : Result()

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...
@Inject
internal lateinit var googlePlayServicesAvailable: GooglePlayServicesAvailable
...

override fun onCreate(savedInstanceState: Bundle?) {
    ...
    googlePlayServicesAvailable.isAvailableShowDialog(this).let {
        when (it) {
            is GooglePlayServicesAvailable.Result.True -> RiseSetActivityPermissionsDispatcher.locationPermissionWithCheck(this)

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@MustBeDocumented
@Target(AnnotationTarget.FUNCTION, 
        AnnotationTarget.PROPERTY_GETTER, 
        AnnotationTarget.PROPERTY_SETTER)
@Retention(AnnotationRetention.RUNTIME)
@MapKey
annotation class ViewModelKey(val value: KClass<out ViewModel>)

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@Module
abstract class DemoModule {

    @Binds
    @IntoMap
    @ViewModelKey(DemoViewModel::class)
    internal abstract fun demoViewModel(viewModel: DemoViewModel): ViewModel
...