How disappear upward navigation in a specific fragment? Hello friends I have added an upward navigation in my project and it is reflected in all the fragments, the problem is that I do not want it to be reflected in my LogInFragment. How do I make it disappear in this fragment? MainActivity class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val navController =...

Swiping gesture preventing click through below I have an activity that is inflated with fragments. I need to observe an area of the activity (Fragment 1 and 2) for a swipe down gesture which will dismiss the activity. I can't add the swipe gesture to the entire activity as Fragment 3 has a pull to refresh and they are conflicting motions. So far I have tried: adding a view that covers fragment 1 and 2 and adding the listener there. However I need to handle...

How to properly mock properties that will be used in init block? When we create a new class A in test it inits our values and in the init block that values are passed to the class B, only after that the values getters are mocked. The main problem is that I want to pass the mocked values to class B in init block. Why do I need that? Assume that class A implements some Callback that is triggered by class B inner logic of which is using these Vals and we need to test the contract between these classes. class A( private val b: B ) { val val1: SomeVal...

array in class does not print a value I have arrayOfNulls in class named readWrite list,and it has two inner classes one of which is super class. I run program in main() and store several values in arrayOfNulls using function AddAll .However, whenever I try to run findAll funciton( which is meant to print all possible values ), it prints nulls instead,even though I have added new values into the array.I assume that it may be due to findAll calls array and a new array of nulls is created again. Is it possible to keep an array...

Textwatcher not calling the function properly I have this function var result : String? = null var numerics = code.filter { it.isDigit()|| it == '.' } var numDouble = numerics.toDouble() var gbpFormula = formula(code, numDouble) when { gbpFormula.second -> { return gbpFormula.first } else -> { result = parser.evaluate(code).toString() if (result.isNullOrEmpty()) { throw Exception("Division by zero not possible") } return result.toString()...

Toast Android 11 customization In Android 11 Toast.setView() is deprecated. I wanted to now if there is a way to achieve similar results without using setView() like custom font, background color, corner radius etc. Below you can find my current view I was using in setView().

How do I parse a response with Ktor I'm trying to do a Get call with Ktor in a multiplatform project. This is the code: private val client = HttpClient() fun myCall(callback: (List) -> Unit) { viewModelScope.launch { val result:List = client.get { url("https://data.sfgov.org/resource/wwmu-gmzc.json") } callback(result) } } Every time I make this request the application closes and I don't receive any message that gives me a clue what's going on. If instead of putting a list Film as...

How do I inject a dependency into an interface delegate in Kotlin? I'm trying to figure out how to inject a dependency into an interface delegate in Kotlin. I have a class: class MyThingie {} And I want to add a field created_time to this class that might also be added to other classes. So I can create an interface and an instance implementation of this interface, and then add that delegation into the class definition: interface ThingieWithCreatedTS { val created_ts: Long } object ThingieCreatedAtNow : ThingieWithCreatedTS { override val...

Leverage suspending functions for implementing a CPS-style interpreter I recently came across this superb blog post, where the author demonstrates several functional design patterns by giving 13 examples to implement turtle graphics. The code is in F# and I was wondering how well it would translate to Kotlin. I am particularly interested in way #13, the interpreter pattern. The types translate very well to Kotlin. sealed class PenColor { object...

spinner value using retrofit and viewmodel Im trying to implement editting cart in my project..for that i have used spinner Adapter::-------- var country = arrayOf(1, 2, 3, 4, 5, 6, 7, 8) . . . val aa: ArrayAdapter = ArrayAdapter(context, android.R.layout.simple_spinner_item, country) aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item) holder.spin.setAdapter(aa) holder.spin.setSelection(dataList?.get(position)?.quantity!! - 1, false)...

getDatabase called recursively error using Room on Android I am trying to run a query using Room. However when I try to run the query I get the following error. java.lang.IllegalStateException: getDatabase called recursively at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:357) at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:317) at...

How to use setOnScrollChangeListener in android studio with kotlin? I'm trying to make this simple app in android studio using kotlin. I have simple ImageButton which i'm trying to change after the user scroll that right or left. I want something like this: Imagebutton.setOnScrollChangeListener( if(you scroll this right){ Imagebutton.setImageResource(something) }else if(you scroll this left){ Imagebutton.setImageResource(another one) } ) I think that setOnScrollChangeListener will help me to create this, but i don't know how to...

How to return from an anonymous lambda in Kotlin? How to return from an anonymous lambda in Kotlin? Somehow the complier doesn't allow to return inside the lambda body. Since the lambda is anonym an return@... isn't possible here. class Foo { var function: (String) -> Unit = { _ -> } init { function = { text -> if (text == "foo"){ return //'return' is not allowed here //This function must return a value of type Foo } print(text)...

Android App Vulnerability - HostnameVerifier, not anywhere in codebase After submission to the Google Play Store I receive an email notification telling me my APK is using an unsafe implementation of the HostnameVerifier interface. I can't find anywhere where I'm using HostnameVerifier in the code at all, so am unable to remove it. I assume it's in a package but any upgrades I do, don't seem to fix it. Can someone point me in the right direction to resolving this vulnerability Here's my project level build.gradle file: buildscript { ext.kotlin_version =...

Android: FCM notification showing up incorrectly I am sending notifications to specific device-tokens with Firebase Cloud Messaging. The notification is being sent from the backend in this form: notification: { title: "New delivery request", body: order.id, sound: "default" } Initially, I was displaying the notification the exact way it was coming from FCM, therefore, the notification looked like this and I was quite comfortable with that: I recently...

How can I avoid adding the plugins 'kotlin-adnroid-extensions' everytime in the build.gradle Since I have uninstalled my Android Studio once. It cant add the kotlin-android-extensions automatically. I have to add it everytime I create the project. How can I default using it.

How to make linear layout inside pop up view responsive? what I want to do is display a responsive pop up view. What I have now is that the pop up view resizes the original linear layout and it displays very bad on some devices. This is how the linear layout xml loooks like and when I run it, this is how it is displayed This is the pop up view code: private fun...

Android Kotlin comparing two long dates I have two long dates : one from the room db and one from the current system time. I am trying to compare the two dates and if they are more than 24 hours apart I want to initialize some logic. I am using kotlin and my app i stargeted to api 23 so the newer date time library for API O and above is not useful at this time. If anyone could help with the logic it would be greatly appreciated.

NullPointerException is occuring and I really don't have any clue of what I am doing wrong. Please help me. And I'm also a newbie SessioManager.kt class SessionManager(context : Context) { private var PRIVATE_MODE = 0 val PREF_NAME = "LoginLogout" val KEY_IS_LOGGEDIN = "isLoggedIn" var pref = context.getSharedPreferences(PREF_NAME, PRIVATE_MODE) //---------error var pref_editor: SharedPreferences.Editor = pref.edit() fun setLogin(isLoggedIn: Boolean) { //use to login or logout pref_editor.putBoolean(KEY_IS_LOGGEDIN, isLoggedIn) pref_editor.apply()...

the MainActivity.kt doesn't recognize the buttons that exists in activity_main.xml I saw I lot of videos says that the kotlin can recognize the button automatically in MainActivity.kt i try this but it doesn'twork for me PS : I'm using android studio 4.1

How to create Android UI library I have so many util codes for UI and want to create a android library for each of them. With all my research I have done below things. File -> new module. Create an android library in build.gradle file implement the library implementation project('appFirstLibrary') Kotlin and xml file in library is below FirstLib.kt class FirstLib(mContext: Context) : Activity() { private var mContext: Context? = null private var view: View? = null fun s(message: String?) {...

What's the problem with implementation of Room? I'm trying to create a Room database following official Android Developers documentation: There is my gradle file for module: But somehow it is not importing a RoomDatabase (it is a fake representation of my class, I hope you can see the point): Recloning the...

How to use Kotlin reflection from Java Is it possible to use Kotlin reflection from Java? I want to get KCallable from kotlin function in Java and use its method callBy to call method with default arguments. Example in Kotlin: fun test(a: String = "default", b: String): String { return "A: $a - B: $b"; } fun main() { val callable: KCallable = ::test val parameterB = callable.parameters[1] val result = callable.callBy(mapOf( parameterB to "test" )) println(result) } Is it even possible? If so,...

Android Paging 3.0 Trying to upgrade to version 3 of paging and i am starting to have difficulties since importing the library ... seems like it is having conflicts to work side to side of coroutines Duplicate class kotlinx.coroutines.AbstractCoroutine found in modules kotlinx-coroutines-core-1.3.9.jar (org.jetbrains.kotlinxkotlinx coroutines core1.3.9) and kotlinx-coroutines-core-jvm-1.3.9.jar (org.jetbrains.kotlinxkotlinx coroutines core jvm1.3.9) Duplicate class kotlinx.coroutines.Active found in modules...

QueryDsl fetch lazy property I have a property which is usually fetched lazily: @Entity class Version(..., @Basic(fetch = FetchType.LAZY) @Type(type = "text") var mappings: String? = null) But sometimes I need to fetch it eagerly. How can I do this with QueryDsl? This is what I currently have: JPAQuery(entityManager).from(QVersion.version) .where(...) .select(QVersion.version) .fetchOne() But this results in a Exception when I try to access the property...

Fatal signal 11 SIGSEGV (RxCachedTreadS) when use RxJava with api, room, retrofit In my application I use RxJava, Some API, Retrofit and Room. My application intermittently crashes after start process, somtimes it working 10~15 minute. But it always force finishing showing this error. A/libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x20 in tid 30800 (RxComputation) I can't find which code evoke this error. MyActivity.kt override fun onCreate(savedInstanceState: Bundle?) { GlobalScope.launch(Dispatchers.IO) { while (true) {...

Android Data Binding. Button onClick not working I am stuck here, help. I've got the following code: ProfileFragment: @AndroidEntryPoint class ProfileFragment : Fragment() { private val profileViewModel: ProfileViewModel by viewModels() override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { val binding = FragmentProfileBinding.inflate(inflater, container, false) binding.viewModel = profileViewModel...

From where come frome that setter in genereted xxxFragmentDirections class? I'm trying to make a method which move us to another fragment and pass score variable, like this: val action = GameFragmentDirections.actionGameFragmentToResultFragment() action.score = viewModel.score.value?:0 NavHostFragment.findNavController(this).navigate(action) //viewModel.onGameFinishComplete() } but here action.score I receive error: unresolved reference: score My code base on that code from android tutorial: <a...

How do I assign a input number as a variable in Android Studio? I want to make an random player picker app so first I need to take the number of players playing the game from the user which will be my variable and then my app will choose a random number out of 1 to that number, but I don't know how to use that input number as a variable. Here is my code:

Optimisation with coroutine i have simple code in Kotlin who made list of request (150) with okhttp lib and for each I parse the html result with JSOUp. I use Coroutine but I don't understand, the time with or without coroutine are the same (23 secondes) Mayeb i ve done something bad? Or http request is limited ? My code : fun parse(list: ArrayList) { runBlocking { list.forEach { launch { val response = requestWithOkhttp(it.url) val doc =...