hamen

@Target(AnnotationTarget.CLASS)
@Retention(AnnotationRetention.SOURCE)
/**
 * Friendly reminder that this might not be the best place to do major changes. Or any changes at all.
 * Use the [reason] arg to point your teammates and your future-self to some documentation.
 */
annotation class HereBeDragons(val reason: String)

RubyLichtenstein

Starting new fragments with Kotlin is easy

Example

val user = User(id = "id", name = "Ruby")
val userFragment: UserFragment = newFragment<User, UserFragment>(user)

How this magic works

npatarino

interface TasksRepository {
    suspend fun tasks(user: User): Either<RepositoryError, List<Task>>
}

fun tasks(tasksRepository: TasksRepository, userRepository: UserRepository):
    () -> Either<RepositoryError, List<Task>> = {
    runBlocking { tasksRepository.tasks(userRepository.currentUser()) } // This is b
}

UseCase<RepositoryError, List<Task>>().bg(tasks(tasksRepository, userRepository))

pablisco

inline fun <A> A.logWith(logger: Logger, block: Logger.(A) -> Unit) : A = 
    this.also { logger.block(it) }

// With interface injection
interface HasLog {
    val log: Logger
    fun <A> A.log(block: Logger.(A) -> Unit) : A =
        logWith(logger, block)
}

Sloy

package com.sloydev.macookbuk.infrastructure.extensions

import android.arch.lifecycle.*

fun <T, R> LiveData<T>.map(transformation: (T) -> R): LiveData<R> {
    return Transformations.map(this, transformation)
}

fun <A, B, C> LiveData<A>.zipWith(other: LiveData<B>, zipFunc: (A, B) -> C): LiveData<C> {
    return ZippedLiveData<A, B, C>(this, other, zipFunc)

pablisco

import android.content.Context
import android.content.res.Resources
import android.graphics.drawable.Drawable
import android.support.annotation.AnyRes
import android.support.v4.app.Fragment
import android.support.v4.content.res.ResourcesCompat.*
import android.view.View

val Context.animations
    get() = ResourceMapper { resources.getAnimation(it) }

rharter

import android.arch.lifecycle.LiveData
import android.content.SharedPreferences

abstract class SharedPreferenceLiveData<T>(val sharedPrefs: SharedPreferences,
                                  val key: String,
                                  val defValue: T) : LiveData<T>() {

  private val preferenceChangeListener = SharedPreferences.OnSharedPreferenceChangeListener { sharedPreferences, key ->
    if (key == this.key) {
      value = getValueFromPreferences(key, defValue)

yanngx

package be.brol

import android.os.Binder
import android.os.Bundle
import android.support.v4.app.BundleCompat
import android.support.v4.app.Fragment

/**
 * Eases the Fragment.newInstance ceremony by marking the fragment's args with this delegate
 * Just write the property in newInstance and read it like any other property after the fragment has been created

JosiasSena

/**
  _____        _____                  _             
 |  __ \      / ____|                | |            
 | |  | | ___| |     _ __ _   _ _ __ | |_ ___  _ __ 
 | |  | |/ _ \ |    | '__| | | | '_ \| __/ _ \| '__|
 | |__| |  __/ |____| |  | |_| | |_) | || (_) | |   
 |_____/ \___|\_____|_|   \__, | .__/ \__\___/|_|   
                           __/ | |                  
                          |___/|_|                  
 */

cutiko

public class LoginActivity extends AppCompatActivity {

    private static final int RC_SIGN_IN = 343;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);