interface PreferenceAccessor {
    val fileName: String
    val context: Context
    val prefs: SharedPreferences 
            get() = context.getSharedPreferences(fileName, Context.MODE_PRIVATE)
}

class PrefAccessorImpl(ctx: Context): PreferenceAccessor {
    override val fileName: String
        get() = "somePrefFileName"
    override val context: Context
        get() = ctx
}

Context

Execution failed for task ':android-client-common:lint'.
> Configuration with name 'compileClasspath' not found.

androidExtensions {
    features = ["parcelize"]
}

maven_push.gradle

object

private val api 
       get() = UserRestApi.instance
   private val authorization
       get() = AccountUtils.userAuthToken

interface

interface Networking {
    val api
        get() = UserRestApi.instance
    val authorization
        get() = AccountUtils.userAuthToken
}

api

authorization

implement

Networking

class MyActivity : AppCompatActivity(), Networking {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.my_activity)
        api.loadSomething(authorization)// so by implementing Networking i can access this fields
    }
}

assetlinks.json

android:autoVerify="true"

intent-filter

<meta-data android:name="asset_statements" android:resource="@string/asset_statements"/>

<https://digitalassetlinks.googleapis.com/v1/statements:list?source.web.site=https://domain.name:optional_port&relation=delegate_permission/common.handle_all_urls>

java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $

@Parcelize

val someMap: Map<String, Any>

@TypeParceler

Place.Builder().setLatLong(LatLong(x,y)).build()

fun ImageView.loadImage(
        url: String?,
        @DrawableRes placeholder: Int? = null,
        circular: Boolean = false,
        roundedCorners: Int = 0
) {
    Glide.with(context)
            .load(url)
            .apply {
                placeholder?.let { apply(RequestOptions().placeholder(it)) }
                if (circular) {
                    apply(RequestOptions.circleCropTransform())
                } else if (roundedCorners != 0) {
                    apply(RequestOptions.bitmapTransform(RoundedCorners(context.dip(roundedCorners))))
               }
            }
            .into(this)
}

Where do you keep your Extension methods?

onCreateView

Fragment