What cause the "Function 'viewModels' must have a body" in Android office document? The following code is from the android office document https://developer.android.com/reference/kotlin/androidx/fragment/app/package-summary#extension-functions-summary But I get the error Function 'viewModels' must have a body, why? @MainThread inline fun Fragment.viewModels( noinline ownerProducer: () -> ViewModelStoreOwner = { this },...

data binding resolve a setter for booleans property I'm using MVVM but got stuck on this: I trying to change a ImageView depending on different booleans states. In my ViewModel I have a MutableList which look lik states.add(States(1, "Marcus", "John", false, false, true, false)) My model: data class States( val id: Int, val name: String, val lastname: String, var sad: Boolean, var happy: Boolean, var excited: Boolean ) What I want to do is depeding on which state is setting on true I can change my ImageView background...

While setting Minimum date for one year calendar is showing hidden date in the calendar header I set a minimum date to the datePicker (setMinDate) and though dates before the minDate are not displayed, there's a bug that if i change the year to past year (with same date as current day), and press OK, the date chosen is a date before the minDate i gave. This was the code i used private fun customCalender() { val cal = Calendar.getInstance() val cal1 = Calendar.getInstance() val dialog = DatePickerDialog(this@MainActivity, { arg0, arg1, arg2, arg3 ->...

why I am getting java.lang.ExceptionInInitializerError in exposed sql? transaction(db) { EventsTable.leftJoin(EventERInfo).innerJoin(EventToObjectToEventType).innerJoin(EventType).innerJoin(Security).innerJoin(SecurityIdentifier).innerJoin(Company).innerJoin(CompanyType) .slice(EventsTable.lastmodifieddate, EventsTable.keydevid, EventsTable.headline, EventsTable.situation, EventsTable.mostimportantdateutc,...

android MediaSession setActive(false) not work I use MediaSession to respond to headset media buttons, and want to stop the sound when activity is paused. I also want to make the headset media buttons not active when activity is paused. From the android documantation, it said the setActive method is use to "set if this session is currently active and ready to receive commands". But it not worked, I can still use head resume the music when activity is paused. Do I misunderstand the use of this function? My code is as followed: package...

How to Refresh Live Data Manually I don't understand how to implement refresh livedata manually. In my case, users oftennly facing connection trouble than the recycler view does not show any data. I want to give swipe refresh layout to refresh the live data. Here is my data source class CourseRemoteDataSource @Inject constructor(private val service: ApiService) : BaseDataSource() { suspend fun fetchFeaturedCourses() = getResult { service.getFeaturedCourses(...

Unable to add apple device in Android studio I want to try out the Kotlin Multiplatform Mobile (KMM) in Android studio. I have installed the Plugin and when I try to add configuration for IOS, nothing shows up. I just have an IOS option but nothing shows up when I click on it. The android device is already set up, so I was able to run it in Android.

How to solve "Content is not allowed in prolog" build error? This is my first app with Android Studio. I just chose Login Activity, then I clicked on run (using my phone as device). I don't know why I am getting problems if what I'm using is a template from Android Studio. This is problem: 1: Task failed with an exception. ----------- * What went wrong: Cannot isolate parameters com.android.build.gradle.internal.dependency.AarResourcesCompilerTransform$Parameters_Decorated@1ad60a40 of artifact transform AarResourcesCompilerTransform

Could not isolate...

Android Foreground Service() issue The mWindowManager is throwing error in the onDestroy addressing lateinit property mWindowManager has not been initialized. But clearly it has been initialized inside onStartCommand. I am starting this foreground service from an activity which is then destroyed. So this service run on its own. And when the user want to destroy the service he/she has to open the app and destroy it from the activity. This issue is only coming from some devices and i am confused what is causing this error. Can...

Object does not exist at location android studio Kotlin I wanna store an image in firebase storage but i got an warning message when running "Object does not exist at location", I don't know where is my mistake, already trying search old answer but all of them in java not kotlin. class Activity2 : AppCompatActivity() { private var curFile: Uri? = null private val imageRef = Firebase.storage.reference private val REQUEST_CODE_IMAGE_PICK = 0 override fun onCreate(savedInstanceState: Bundle?) {...

How to empty a table in SQLITE once a limit is reached? lets say I have a table named events. I want to know how I can limit the number of rows in the table. for example, when there are 30 rows present in the table, I want to print all the rows in logging in android studio and then empty the table without deleting its structure.

Avoid passing a parameter multiple times in fragment I am using ViewPager2 in my app. I have following code to set adapter to ViewPager : viewModel.creditWrapper.observe(viewLifecycleOwner, Observer { creditWrapper -> fragmentManager?.let { val myAdapter = ViewPagerFragmentAdapter(it, lifecycle) val castPagerItem = PagerItem(CreditFragment.newInstance(tmdbItem, creditWrapper.cast as ArrayList), R.string.cast) val crewPagerItem =...

How does the kotlin compiler process java code when compiling kotlin code? I only know that when compiling a mixed project of java and kotlin, the compiler will process the kotlin code first, but if an object of the java class is created in the kotlin code, how does the compiler handle it?

Can Anyone Tell why My Android Widget is not showing Data I am Using AsyncTask for this Here it is package com.imdigitalashish.vacoder; import android.appwidget.AppWidgetManager; import android.content.Context; import android.content.Intent; import android.os.AsyncTask; import android.os.SystemClock; import android.util.Log; import android.widget.RemoteViews; import android.widget.RemoteViewsService; import androidx.room.Room; import com.imdigitalashish.vacoder.database.Task; import com.imdigitalashish.vacoder.database.TaskDatabase; import java.util.ArrayList; import...

How to properly reverse Linked List in Kotlin? I have done both Hackerrank and Leetcode reverse LinkedList questions and my code below works perfectly in Leetcode, passing all test cases but fail some tests cases in hacker rank. The same code written in python or C++ passes all the hacker rank test cases. what might be the problem? The Kotlin code is if (head == null) return head var new_head = head var next_node = new_head.next while(next_node != null){ val temp =...

Unresolved reference: font in Android Studio I am trying to set a font to a text view in android studio but for some reasons, I cannot access the font directory. I get Unresolved Reference: font What I did - Created a new directory by right clicking res > new > Android Resource Directory > Directory name : font > Resource type : font - Placed my font in that directory, so the directory reads - res/font/myfont.ttf - In my fragment I tried to access the font like this var typeFace: Typeface? = ResourcesCompat.getFont(requireContext(),...

Now to write this regular expression correctly in Kotlin to test the code in Pascal I tried to do this, not quite the right solution, because if you remove the semicolon, it will still be true, but it should be false Here is the assignment: Checking the correctness of the for statement, in which the initial and non-integer values ​​can be either integers or symbols, and the body of the loop is the write(ln) operator, whose arguments are integers and real numbers and variables. Sample Pascal code to check: for i:=1 to n do write(0); My attempt to implement this regex on...

kotlin specific error: Empty list doesn't contain element at index 0 The app is crashing on the start and this issue is device specific. I am using this view in my main activity - I have also post the issue here: https://github.com/ibrahimsn98/SmoothBottomBar/issues/55 the error occured even I have not use the SmoothBottomBar View in my java file. Acc to the issue described here <a href="https://github.com/JetBrains/kotlin-native/issues/1790" rel="nofollow...

How to call Kotlin coroutine in composable function callbacks? I want to call a suspend-function inside of a callback of composable-function. suspend fun getLocation(): Location? { /* ... */ } @Composable fun F() { val (location, setLocation) = remember { mutableStateOf(null) } val getLocationOnClick: () -> Unit = { /* setLocation MAGIC getLocation */ } Button(onClick = getLocationOnClick) { Text("detectLocation") } } If I would have used Rx then I could just subscribe. I could do invokeOnCompletion and then...

Camera Enable/Disable in not working in Android 10 or Later With Device Admin I am facing problem of Camera Enable/Disable in Android 10 or later with Device Admin permission Document says Deprecated With the release of Android 9.0, the following policies are marked as deprecated when invoked by a device admin, but the APIs otherwise continue to function. USES_POLICY_DISABLE_CAMERA USES_POLICY_DISABLE_KEYGUARD_FEATURES USES_POLICY_EXPIRE_PASSWORD USES_POLICY_LIMIT_PASSWORD Starting with the release of Android 10.0, the above-mentioned policies will throw a...

Why my cursor disappears when I target error(red line)? I have problem with my error-popup. I don't know exactly when this error started too. I guess it started since 2weeks ago. When I want to know why it has error(red line), I target error line but It doesn't display tool-tip box. Alt+Enter is working, but only error tool-tip. I want to know why it occurs red line and fix it, but I have no idea. Error popup pops often, and It disappear soon. I even thought about whether I had a 'Hand Tremor', but I don't. I tested with tablet pen too. I captured...

Make an image with map functionalities on Android application I have designed a custom map by using photoshop and now I want to implement the map functionalities (markers, tiles, etc.) in an android application (Kotlin development). Is any library or tool that can help with this operation?

Mock ApolloClient's query(call) for testing purposes Kotlin Android app using graphQl & ApolloClient. I want to test this method: fun myMethod(id: String): Single { val call = Query(id) return Rx2Apollo.from(apolloClient.query(call)) .map { modeCode() }.firstOrError().onErrorReturn { emptyList() } } Is there an elegant way to mock the response of apolloClient.query(call) so Rx2Apollo returns the response? I tried with a RealApolloCall, with a custom ApolloCall, etc, nothing convinces me. And I wouldn't want to extract and mock...

Flutter - Send params to Gradle from Flutter I need to create Flutter plugin which will be a wrapper for certain Android/iOS third party SDK. Android native SDK needs login and pass to be typed in build gradle in order to fetch SDK dependences from private repository. My question is how Flutter plugin user can send own credentials to build gradle in order do fetch native sdk ?

How with vararg return result on kotlin? I have a code like this but I don't understand where is the error? The function should return the result of checking two words for matching characters in these words. An unlimited number of arguments can be passed to the function fun howInTwoWords(vararg s:String): String { return s.split(" ").flatMap { it.toSet() }.groupBy { it }.filterValues { it.size > 1 }.keys.joinToString(separator = "") } fun main() { println(howInTwoWords("hello","world")); } Example: Input:hello world...

How to make Navigation Drawer with dynamic, custom Menu Items I want to make a navigation drawer, where before I add the items to the menu, I am able to change, say, the text or the image. I'm not sure what's wrong, the app just crashes when I start it. Here is the drawer_menu_item.xml, which holds the custom menu item. activity_main.xml In the activity, I then add the items dynamically class MainActivity : AppCompatActivity() { private lateinit var drawer: DrawerLayout private...

Kotlin probleme with generating Kdoc Hi i am having trouble with Kdoc so i followed this : https://blog.jetbrains.com/kotlin/2020/08/dokka-preview-based-on-kotlin-1-4-0-rc/ I was able to add the plugins in the gradle base project, then with the command ./gradlew dokkaHtml on the terminal i was able to generate the doc. Here is the outcome : <a href="" rel="nofollow...

Any reason why my Sensor Listeners are not being registered on one device, when they are on another? I am using the code below to register for sensor data and have been testing on 2 Samsung Galaxy devices (S6 7.0 and S9 10.0). I can receive data in onSensorChanged with the S9 but not the S6. I noticed in the logs that the listeners on the S6 are failing to register: D/SensorManager: registerListener fail :: 5, TMD49XX Proximity Sensor, 200000, 0, D/SensorManager: registerListener fail :: 6, TMD49XX RGB Sensor, 200000, 0, D/SensorManager: registerListener fail :: 1, YAS537 Magnetic Sensor,...

how added R string in this script in kotlin? noInternet?.invoke(R.string.nointernet) i want to call string in this script but error. how to resolve? thank you

How do I dial a contact that was saved from within the app So I created an app where you can store contacts of emergency services or numbers by long pressing a button, and dials that same contact that was saved by a single tap of the button. So far I have written the code to save the contact with a long press but I have no idea how to dial that same contact with a single tap. This is the code ; class ServicesActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState)...