LIPNUS

https://www.androidly.net/309/android-alert-dialog-using-kotlin

백준 11437 LCAhttps://www.acmicpc.net/problem/11437 1번은 DP안써도 풀림. public class Main { static int N; //노드개수 static int M; //공통조상을 알고싶은 쌍의 수 static List[] map; static boolean[] visited; static int[] depth; static int[] parent; public static void main(String[] args) throws Exception{ BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st; N = Integer.parseInt(br...

https://gmlwjd9405.github.io/2018/09/17/class-object-instance.html

class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) // Variable to hold service class name val serviceClass = RandomNumberService::class.java // Initialize a new Intent instance val intent = Intent(applicationContext, serviceClass) // Button to start the service button_start.setO..

Country Picker무난무난 https://github.com/hbb20/CountryCodePickerProject/wiki/How-to-integrate-into-your-project Gradleimplementation 'com.hbb20:ccp:2.2.4' activity_main.xml MainActivity.ktclass MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) Log.d("SSS", "현재국가코드: ${Locale.getDefault()..

RxBus액티비티, 서비스, 프레그먼트 서로간에 이벤트를 주고받을 수 있다. https://android.jlelse.eu/rxbus-kotlin-listen-where-ever-you-want-e6fc0760a4a8 Gradleimplementation "io.reactivex.rxjava2:rxjava:2.0.1" 싱글톤import io.reactivex.Observable import io.reactivex.subjects.PublishSubject // Use object so we have a singleton instance object RxBus { private val publisher = PublishSubject.create() fun publish(event: Any) { publis..

Immortal Serviceforgraound Service를 이용하면 안죽는다. 그대신 노티피케이션에 항상 나타나 있어야 한다. Foreground Service를 통해 죽지 않는 서비스 만들기 startForeground(int id, Notification notification) 뚜둥.. 단지 저 메소드를 앞에서 만든 ScreenService의 onStartCommand()안의 어딘가에 넣어주면 됩니다. 넘.. 간단 합니다 ;; 여기서 int id 는 Notification의 id를 의미하며 Notification notification 는 서비스가 foreground로 실행되는 동안 나타날 Notification입니다. Notification을 띄우는 방법에 대해서는 다음에 알아보기로 하고~ ..

1.MainActivity.ktclass MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) // Variable to hold service class name val serviceClass = RandomNumberService::class.java // Initialize a new Intent instance val intent = Intent(applicationContext, serviceClass) // Button to start the service ..

SELECT * FROM `ranking` WHERE date > (curtime() - INTERVAL 7 DAY) https://webisfree.com/2016-05-09/[mysql]-%EB%82%A0%EC%A7%9C-%EC%9D%B4%EC%A0%84-%EB%98%90%EB%8A%94-%EC%9D%B4%ED%9B%84-%EB%B3%B4%EC%97%AC%EC%A3%BC%EB%8A%94-%EC%BF%BC%EB%A6%AC%EB%AC%B8

First Class Citizen(1급 객체)https://medium.com/@lazysoul/functional-programming-%EC%97%90%EC%84%9C-1%EA%B8%89-%EA%B0%9D%EC%B2%B4%EB%9E%80-ba1aeb048059 1급객체의 조건 3가지 변수나 데이타에 할당 할 수 있어야 한다. 객체의 인자로 넘길 수 있어야 한다. 객체의 리턴값으로 리턴 할수 있어야 한다. 1.변수나 데이터에 할당할 수 있어야 한다object Main { @JvmStatic fun main(args: Array) { val a = test } val test: () -> Unit = { println("kotlin") } } 2.객체의 인자로 넘길 수 있어야 한다object Main ..

Higher-order-function(고차함수)https://medium.com/@lazysoul/high-order-function-%EA%B3%A0%EC%B0%A8%ED%95%A8%EC%88%98-22b147d0c4a5 함수를 인자로 받거나, 함수를 반환하는 함수이 조건이 성립하기 위해서는 기본적으로 함수가 FirstClassCitizen이어야 함object Main { @JvmStatic fun main(args: Array) { println(simpleHigherOrderFunction({ x, y -> x + y }, 10, 20)) //30 println(simpleHigherOrderFunction(sumInts, 10, 20)) //30 println(simpleHigherOrderFu..

Google Login https://grokonez.com/android/kotlin-firebase-authentication-google-sign-in-androidhttps://medium.com/@myric.september/authenticate-using-google-sign-in-kotlin-firebase-4490f71d9e44 Build.Gradle(Project: ~)dependencies { classpath 'com.android.tools.build:gradle:3.3.0' classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" classpath 'com.google.gms:google-services:4.2...

https://stackoverflow.com/questions/31505263/missing-top-level-build-gradle-in-multi-module-project Closed all the open projects.Removed project from recent projects in "Welcome to Android Studio" window.Now click "Open existing android studio project" & browse to the project repo & select top level build.gradle.

Cannot resolve symbol default_web_client_id https://stackoverflow.com/questions/37810552/cannot-resolve-symbol-default-web-client-id-in-firebases-android-codelab Solution//구글 로그인 옵션 var gso = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN) .requestIdToken(getString(R.string.default_web_client_id)) .requestEmail() .build()getString(R.string.default_web_client_id)이거 대신 google-serv..

End of input at line 1 column 1 path $ retrofit에서 response값이 비어있을 때(Length=0) 발생다음의 코드를 추가한다 Java코드 해결책https://medium.com/@kenkyee/retrofit2-doesnt-handle-empty-content-responses-bef2b33ee8ea Kotlin코드http://kotlinandroidtutorials.com/retrofit-best-practices/ /** * 비어있는(length=0)인 Response를 받았을 경우 처리 */ class NullOnEmptyConverterFactory : Converter.Factory() { override fun responseBodyConverter(t..

Heap -> Priority Queue

백준 11286 절댓값 힙https://www.acmicpc.net/problem/11286 import java.io.BufferedReader; import java.io.InputStreamReader; import java.util.PriorityQueue; public class Main { static PriorityQueue pq = new PriorityQueue(); public static void main(String[] args) throws Exception{ BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); int N = Integer.parseInt( br.readLine() ); for(int ..

백준 11279 최소 힙https://www.acmicpc.net/problem/1927import java.io.BufferedReader; import java.io.InputStreamReader; import java.util.Collections; import java.util.PriorityQueue; public class Main { static PriorityQueue pq = new PriorityQueue(); public static void main(String[] args) throws Exception{ BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); int N = Integer.parseInt..

http://java-lang-programming.com/en/lints/1 에러내용에러라기 보다는 Warning정도App is not indexable by Google Search; consider adding at least one Activity with an ACTION-VIEW intent filter. See issue explanation for more details. less... (⌘F1) Inspection info:Adds URLs to get your app into the Google index, to get installs and traffic to your app from Google Search. Issue id: GoogleAppIndexingWarning More i..

const val과 그냥 val의 차이 consts are compile time constants. Meaning that their value has to be assigned during compile time, unlike vals, where it can be done at runtime.This means, that consts can never be assigned to a function or any class constructor, but only to a String or primitive.For example:const val foo = complexFunctionCall() //Not okay val fooVal = complexFunctionCall() //Okay const va..