Issue #687
Although I do Swift, I often follow Kotlin guideline https://kotlinlang.org/docs/reference/coding-conventions.html#functions-vs-properties
In some cases functions with no arguments might be interchangeable with read-only properties. …
Issue #555
Synthetic properties generated by Kotlin Android Extensions plugin needs a view for Fragment/Activity to be set before hand.
In your case, for Fragment, you need to use view.btn_K in onViewCreated
override fun onCreateView(inflater: …Issue #497
Synthetic properties generated by Kotlin Android Extensions plugin needs a view for Fragment/Activity to be set before hand.
In your case, for Fragment, you need to use view.btn_K in onViewCreated
override fun onCreateView(inflater: …Issue #431
build.gradle
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath …Issue #388
https://kotlinlang.org/docs/reference/coroutines/flow.html
Using List
result type we can only return all the values at once. To represent the stream of values that are being asynchronously computed we can use Flow type …
Issue #383
Right click res -> New -> Android Resource Directory, select anim and name it anim
Right click res/anim -> New -> Android Resource file, name it bounce
<?xml version="1.0" encoding="utf-8"?>
<set …Issue #382
import android.content.Context
fun Int.toDp(context: Context?): Int {
if (context != null) {
val scale = context.resources.displayMetrics.density
return (this.toFloat() * scale + 0.5f).toInt()
} else { …Issue #381
From API < 17, there is ViewCompat.generateViewId() For API 17, there is View.generateViewId()
Note that to use ConstraintSet, all views under ConstraintLayout inside xml must have unique id
val imageView = ImageView(context)
imageView. …Issue #380
https://developer.android.com/guide/topics/ui/look-and-feel/downloadable-fonts
Android 8.0 (API level 26) and Android Support Library 26 introduce support for APIs to request fonts from a provider application instead of …
Issue #379
interface Api {
@GET("topstories.json?print=pretty")
suspend fun getTopStories(): List<Int>
@GET("item/{id}.json?print=pretty")
suspend fun getStory(@Path("id") id: Int): Item
}
class Repo { …Issue #378
After having a generic RecyclerView, if we want to show multiple kinds of data in Fragment, we can use generic.
We may be tempted to use interface or protocol, but should prefer generic.
class FeedFragment() : Fragment() {
override fun …Issue #370
Define response model
import com.squareup.moshi.Json
data class Response(
@field:Json(name="data") val data: ResponseData
)
data class ResponseData(
@field:Json(name="posts") val posts: Posts
)
data class Posts( …Issue #367
https://api.github.com/search/repositories?sort=stars&order=desc&q=language:javascript,java,swift,kotlin&q=created:>2019-08-21
interface Api {
@GET("https://api.github.com/search/repositories")
suspend fun …Issue #366
Code uses Retrofit 2.6.0 which has Coroutine support
app/build.gradle
implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.2.0-alpha01"
implementation "com.squareup.moshi:moshi:$Version.moshi"
implementation …Issue #359
app/build.gradle
implementation "org.koin:koin-core:$Version.koin"
implementation "org.koin:koin-androidx-scope:$Version.koin"
implementation "org.koin:koin-androidx-viewmodel:$Version.koin"
MyApplication.kt
import …Issue #358
app/build.gradle
implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.2.0-alpha01"
import androidx.lifecycle.ViewModel
import androidx.lifecycle.liveData
import kotlinx.coroutines.Dispatchers
class MainViewModel : ViewModel …Issue #357
generic/Adapter.kt
package com.onmyway133.generic
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
abstract class Adapter<T>(var items: …Issue #349
build.gradle
dependencies {
classpath 'android.arch.navigation:navigation-safe-args-gradle-plugin:1.0.0-alpha05'
}
app/build.gradle
apply plugin: 'androidx.navigation.safeargs'
dependencies {
def navigationVersion …Issue #327
In terms of tests, we usually have files for unit test, UI test, integeration test and mock.
Out of sight, out of mind.
Unit tests are for checking specific functions and classes, it’s more convenient to browse them side by side …
Issue #285
settings.gradle.kts
include(":app")
build.gradle.kts
import org.gradle.kotlin.dsl.apply
import org.gradle.kotlin.dsl.dependencies
import org.gradle.kotlin.dsl.kotlin
import org.gradle.kotlin.dsl.*
import …Issue #270
As you know, in the Pragmatic Programmer, section Your Knowledge Portfolio, it is said that
Learn at least one new language every year. Different languages solve the same problems in different ways. By learning several different …
Issue #147
Each language and platform has its own coding style guide. This goes true when it comes to abbreviations. I’ve had some debates about whether to use JSON or Json, URL or Url, HTTP or Http.
I personally prefer camelCase, so I’m …
Issue #139
From https://kotlinlang.org/docs/reference/lambdas.html
class HTML {
fun body() { ... }
}
fun html(init: HTML.() -> Unit): HTML {
val html = HTML() // create the receiver object
html.init() // pass the receiver …Issue #135
override fun adapt(call: Call<T>): …Issue #123
From https://kotlinlang.org/docs/reference/coroutines.html
To continue the analogy, await() can be a suspending function (hence also callable from within an async {} block) that suspends a coroutine until some …
Issue #114
Picture worths thousand words. Code worths thousand pictures. I don’t understand much until I take a look at Standard.kt in Kotlin standard library.
/**
* Calls the specified function [block] with `this` value as its receiver and …Issue #108
There’s always need for communication, right 😉 Suppose we have OnboardingActivity that has several OnboardingFragment. Each Fragment has a startButton telling that the onboarding flow has finished, and only the last Fragment shows …