proposal for discussion: Java vs c# vs Javascript vs kotlin vs dart vs typescript [closed] Java vs c# vs Javascript vs kotlin vs dart vs typescript, all these language are just too similar. As a programmer, when you create many things that are similar than u know that your design is wrong, maybe it's time to reinvent our programming design? Or at least create a way to bridge between the different language? This is not really a question, but a proposal for discussion.

What does "mInflator" stand for? [duplicate] This question already has an answer here: Why do most fields (class members) in Android tutorial start with `m`? 14 answers I see "mInflator" used as a property name around the place in many examples, but I can't seem to figure out what it stands for. Specifically,...

Kotlin: Nestes Regexes / same group name multiple times I have three Regexes. The first one is for a name (eg John Doe or John or "Dr. John Doe" (With quotes)). The second one is a greeting (eg Greetings, or Hi, ). The third one is for another person, who greets "John" (eg Michael says, ... or ..., says Michael) (.. is the greeting). From a piece of text I want to extract the name and Greeting, and the person who greets, if it exists. The text can be a greeting, person who greets or just the name. This is my current source code. Kotlin won't...

Rxjava and OkHttp request I'm new to reactive programming and currently learning kotlin. I'm trying to make an API request using okhttp client but instead of using asynctask, I want to try rxjava. fun network():Observable{ val exe = Observable.create { emitter-> emitter.onNext("https://pokeapi.co/api/v2/pokemon/500") } return exe.onErrorReturn{ it.toString() }.subscribeOn(Schedulers.io()).flatMap { val c = OkHttpClient(); val req = Request.Builder()...

Access List<CustomObject2> inside a Deferred<CustomObject1> in Koltin with Coroutines I'm trying to get a JSON array within a JSON object and store it into a data class called store. I have a data class Data and it stores a List reference. Store is what I actually need. Now through retrofit and Kotlin coroutines, I am trying to get the store data and store it in a var storeData and access its size. However, I'm having a lot of trouble doing so because when I use async{...} and .await() at the end, it gives me a Deferred type object and I cannot access the .size property of...

How to add table rows in table layout dynamically? I have a list of dynamic data and want to show it in two rows and two columns. I have changed linear layout to table layout in my xml file but I need to add table rows in my code. How would I do that? Here is the code for the list of data: https://imgur.com/fJ0fZOd Here is what I want my list to look like: https://imgur.com/FNPfocu

How to define top-level function with sharedPreferences inside? I'm trying to make this function accessible from all files but if I define it outside class in Kotlin file, it shows me error for getSharedPreferences as unresolved reference. I think this is my answer but I don't know how to declare top-level function. How it can be done? package com.example.app fun retrieveData() { val mypref = getSharedPreferences ("mypref",...

Get index of the first and last digit in a string Kotlin fun getIndex(val sampleString: String){ val startIndex = sampleString.indexOfFirst{ it.isDigit() } val endIndex = sampleString.indexOfLast{ it.isDigit() } } Hi, I am trying to get the index of the first and last digit is a string eg: "ab12cd" and I would like to get back 2 as startIndex or 3 as endIndex. Am I doing it correctly? If not, what would be your suggestion. I could do it the long way but I would like to make use of Kotlin's extension to achieve this. Thank you.

Json exception: Expected BEGIN_OBJECT but was BEGIN_ARRAY I was spending 3 hours and I couldn't find the parsing error reason. I have this JSON [ { "id": "WMWSW31030T222518", "modelName": "MINI", "name": "Vanessa", "make": "BMW", "latitude": 48.134557, "longitude": 11.576921, "carImageUrl": "" }, { "id": "WMWSU31070T077232", "modelName": "MINI", "name": "Regine", "make": "BMW", "latitude": 48.114988, "longitude": 11.598359, "carImageUrl":...

Bmi calculator kotlin I'm in the process of learning android studio and kotlin. I have no experience with java so while learning kotlin I'm only drawing on experience I have from C# programming. I am trying to make a simple script which takes the input from the text field of height and weight take them and put them into a formula that gives the BMI score which is then printed everything works when I tested the script by simply multiply or adding height and weight together to test so I know the general code works....

Button onclicklistener not fired in Fragment I'm using Kotlin 1.3.61, kotlin extensions, androidx.appcompatappcompat1.1.0, androidx.constraintlayoutconstraintlayout1.1.3, androidx.corecore ktx1.1.0, org.jetbrains.kotlinkotlin stdlib jdk71.3.61 and access a button defined in my xml in the fragment, like so: class MyFragment : Fragment(), OnMapReadyCallback { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) Log.i(TAG, "In onCreate()") } override fun...

Kotlin regexp matching parenthesis content I'm trying to match parenthesis content using kotlin. I found that regex should be /(([^)]+))/ but can"t have it working in kotlin val pattern = """/\(([^)]+)\)/""".toRegex(RegexOption.LITERAL) val text = "aaaa (ferf ) veffef (frr) refef" fun main() { println(pattern.matches(text)) } returns false...

Cannot Resolve EAN13 Barcode I am trying to create an EAN 13 barcode. I was able to create a Code128 barcode but EAN 13 seems to not work correctly. I have looked around SO and the web but nothing seems to work. Any assistance on resolving this issue is greatly appreciated. BarcodeActivity.kt class BarcodeActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_barcode)...

Displaying app icon on contact field android kotlin hello i'm trying to show my app icon contact like whatsapp and telegram does i've been trying to follow this repo here i've try to follow all the codes but it seems like i'm missing something but i don't know what is it i've been following all the xml and codes here's my code Account General object AccountGeneral { val ACCOUNT_TYPE = "com.matali.testsyncandroid." val ACCOUNT_NAME =...

Radio Button with EditText by DataBinding in android I am new in using Data Binding , I want to enable or disable Edit Text according to Radio Group selection from user .

App crashes when no internet during Retrofit2 Get request My application seems to keep crashing giving me an E/AndroidRuntime: FATAL EXCEPTION: main error when i try to make a Get request to a server and there is no internet. I expected the app to run but no data be displayed. Log.i("getStoreData()" , "Inside the coroutine before getData") this is the last log that I have put myself gets printed before the app crashes. private fun getStoreData() { Log.i("getStoreData()", " inside getStoreData") val job = coroutineScope.launch...

How to update a text view from a Room database using LiveData? I'm trying to create a simple counter app that uses Databinding, Room database, and live data. Currently when the user presses the plus button, it updates a local live data value which then updates the database number. When I try to attach the value from the database dbCount, I get an databinding error. How can I get the live data from the database to the text view? Note: I'm new to android development so I'm still learning the concepts. <a...

Not found import kotlinx.coroutines.flow.* I am trying to learn Kotlin Flow. And when I try to add import kotlinx.coroutines.flow.* it is not resolving. Can you please look at my dependencies and help to solve the problem? apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply plugin: 'kotlin-android-extensions' apply plugin: 'kotlin-kapt' implementation "org.jetbrains.kotlinkotlin stdlib jdk7$kotlin_version" implementation 'androidx.corecore ktx1.1.0' ext.kotlin_version = '1.3.61' Please help me...

Canvas drawing box with rounded corners using path not working In my app i'm trying to draw a box whose corners will rounded using canvas but when i'm using path with radius it is not working a expected and the line which is drawn is not rounded how can i solve this? Here is my code : mBorderPaint = Paint() mBorderPaint.setDither(true) mBorderPaint.setColor(Color.RED) mBorderPaint.setStyle(Paint.Style.STROKE) mBorderPaint.setStrokeJoin(Paint.Join.ROUND) mBorderPaint.setStrokeCap(Paint.Cap.ROUND)...

How does KProperty1 transform into a lambda? I have the following code which works as expected - data class Customer(val id: Int, val name: String) val initialCustomers = arrayOf(Customer(1, "Kotlin"), Customer(2, "Spring"), Customer(3, "Microservice")) val customers = ConcurrentHashMap(initialCustomers.associateBy(Customer::id)) What I don't understand is how Customer::Id which is of is of type KProperty1 Somehow accepted by initialCustomers.associatedBy() function, which is meant to take a lambda as a parameter. Can...

How to solve Unfortunately app has stopped App is running in api 25 and above fine but whhen i install in api level 23, app stopped unfortunately on open second activity. Process: com.watools.statusforwhatsapp, PID: 28976 android.view.InflateException: Binary XML file line #7: Binary XML file line #7: Error inflating class at android.view.LayoutInflater.inflate(LayoutInflater.java:539) at android.view.LayoutInflater.inflate(LayoutInflater.java:423) at...

coroutine Flow : Not sure how to convert a Cursor to this method's return type When I am trying to change the Dao to the new FlowApi, I am getting the compilation error stating that Not sure how to convert a Cursor to this method's return type public abstract kotlinx.coroutines.flow.Flow readCampaigns(); The Dao is @Dao interface CampaignDao { @Query("SELECT * FROM campaign ORDER BY timeStamp ASC") fun readCampaigns(): Flow @Query("SELECT * FROM campaign WHERE id = :campaignId") fun readCampaign(campaignId: Int): Flow } and the dependencies...

How to inject data class in android with dagger where data class parameter have no default value? My data class like: data class Animal(var id:Int = 2) { } My Provides method in module class like: @Provides @Singleton fun provide(): Animal { return Animal() } I want to avoid default value in data class parameter.

How to assign ID for SQLite database object in kotlin? I practice in android kotlin coding and I create SQLite database. How I can to assign ID for object when it create? Database.kt: class PartnerDB(context: Context): SQLiteOpenHelper(context, "partner.db", null, DB_VERSION) { var context: Context? = null init { this.context = context } companion object { val PARTNER = "partner" val DB_VERSION = 1 val CREATE_TABLE_PARTNER = "CREATE TABLE person(pid INT, plogin TEXT, ppassword TEXT," +...

Android studio - ambiguous method call in inheritance chain (Kotlin Java interoperability) So I have 3 classes - base Java -> Kotlin descendant -> Java descendant. public class JavaParentClass { public void doSmth(List item) {} } open class KotlinDescendant : JavaParentClass() { override fun doSmth(item: MutableList?) { super.doSmth(item) } } public class JavaDescendant extends KotlinDescendant { void someMethod() { doSmth(new ArrayList()); } } For JavaDescendant class compiler in Android Studio shows error "Ambiguous method call. Both in...

KOTLIN drawer icon position and button line I would like to move the drawer standard icon position from the left of the text to the right. I would also like to have a line above and below my buttons to create a break between the button items. Do I need to modify my menu xml file?

Access a variable outside of an anonymously implemented interface in Kotlin (using Object) I've confused my life in fixing this. In short, I cannot access Context in outside of anonymous Kotlin object. First, I got this plain basic recycler view adapter stuff. class CashAdapter(private val cashList: List, private val clickedAction: ClickedListener) : RecyclerView.Adapter() { interface ClickedListener { fun onItemClick(cash: Cash) } // the rest of plain basic recycler view adapter stuff } Then, I got a plain basic Activity in using the adapter as...

Reverse Data binding android kotlin this is my view model class MyViewModel : ViewModel() { var name: String? = null fun setNameToUi(newName: String?){ name = newName } } can I use the setNameToUi to perform the reverse binding

context inside CustomHandler class fun handleMessage(msg) Kotlin Trying to use Activity context inside handleMessage() but getting error also tried creating object companion but still got no solution can anyone let me know how to fix it .Im new with kotlin problem is at this@OTPScreen public class ViewHandler : Handler(){ override fun handleMessage(msg: Message?) { super.handleMessage(msg) var data = msg!!.obj.toString() var jsonObject : JSONObject = JSONObject(data) val status = jsonObject.getInt("status")...

auto generated constructor Kotlin I am not seeing the auto generate constructor option in android studio with Kotlin . With Java I was used to make auto generate constructor to all fields . Is there an option for this in Kotlin ? Thanks .