How to change the code so that it is in 1 line I don’t know how you can transform this code so that it is written in one line, is it even possible? I am just starting to learn the Kotlin programming language, so I ask for help fun main() { var s = readLine(); var w = Array(128){0} var g = Array(128){0} if(s!=null) { for(c in s) { if(c.toInt() != 32) { w[c.toInt()] = 1 } for(k in 0..127) { if(w[k] == 1)...

Gradle sync failed in Android Studio 4,0,1 on Windows 10 I create new Empty project in Android Studio API 26 but Grade sync fails ... Cause: unable to find valid certification path to requested target In particular https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.4.10/kotlin-gradle-plugin-1.4.10.pom tells me ERROR 404 NOT FOUND ... Can someone help me ?

How to check record is fully empty on left join in jooq query I try to fetch a record from table with left join on another table. An information in the second table can be not found but I expect an information from the first table. val citizenship = Tables.COUNTRIES.`as`("citizenship") try { return context.selectFrom(Tables.CLIENT_PROJECTIONS .leftJoin(citizenship).on( Tables.CLIENT_PROJECTIONS.CITIZENSHIP_COUNTRY_CODE.eq( citizenship.CODE_ALPHA2...

open another fragment by click in recyclerview in one I have a main fragment, that is opening child fragment with recyclerview in onCreateView Also there is interface and overrided onClick method, there I trying to replace fragment with another class GroupsFragment(uid:Int) : Fragment(), ActionFragmentInterractor { private var groupChoiser=VKGroupChoiseFragment(uid) override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?) = inflater.inflate(R.layout.groups_fragment, container, false)!!...

Android Kotlin - VideoView starts playing at not the current item in RecyclerView This is the RecyclerView Adapter(I removed all kind of non necessary stuff for better overview): var mpp: MediaPlayer? = null private fun pause(){ if (mpp != null){ mpp!!.pause() } } private fun resume() { if (mpp != null) { mpp!!.start() } } override fun onBindViewHolder(holder: ViewHolder, position: Int) { mpp = null if(isVideo){ val uri = Uri.parse(fileUrl) holder.vid.setVideoURI(uri) holder.vid.requestFocus()...

I want to update my sharedPreferences whenever a user login the app I'm developing an android application and I want to use the sharedPreferences to take decisions based on the type of user. for example if the user is donor show these options or else show others. I've tried it using a sharefPrefs class and then deleting previous prefs on the login and creating new one on right after that. and then using these new sharedPrefs in the mainActivity to make runtime Decisions but I'm continuously getting sharedPrefs value from the previous users login type. kindly...

How create a mobile app that will access the URL (request) when opened? I need to create a mobile app that will access the URL (request) when opened. How do I implement this on Kotlin?

Firestore sometimes doesn't insert data I'm new to Firestore and I've encountered something interesting. My application doesn't insert data to Cloud Firestore, but it does from time to time. I can't spot where's the problem. Below you can find my code. PS: Firebase user registration and logging in work perfectly fine. if (cardViewValidationSignUp(name, password, email)) { showProgressBar(this) FirebaseAuth.getInstance().createUserWithEmailAndPassword(email, password)...

How to create and manage a multi tab Android app? I'm trying to add multi tab functionality (browser like) to an already existent app, a mobile client for Netbox, and the goal is to implement a multi tab environment to manage more items at the same time. This app is written in Kotlin, using android navigation (single activity) and MVVM. Searching on the internet I didn't find a reliable solution, and I came up with an idea based on managing multiple instances...

What intent is used to open wallet app in android programming What intent should use to open wallet app(like blockchain, tronlink pro,...). To open android market app we can use this: "market://details?id=" + appPackageName I want use an intent that show all wallet app installed on device. Thanks.

Publishing multimodule gradle project (Gradle Kotlin DSL) I want to publish a project which contains several modules, each module should be published individually. The modules depend on each other. I am a complete newcomer in this field and have watched a few videos, so I came to OSSHR, created a repository and now I don't know how I can publish the modules there using Gradle. Affected github repository: https://github.com/oberstrike/test-framework I tried to make...

Unable to reproduce Firebase Fatal Exception: java.lang.NullPointerException I'trying to reproduce the exact error message, which I got from firebase crashlytics console: Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String ru.example.Foo.getId()' on a null object reference at... I've tried this public void onClick(View v) { Object obj = null; obj.hashCode(); } and all I get is something like this: java.lang.NullPointerException at com.foo.ActivityJava$1.onClick(ActivityJava.java:26) or this: val n =...

Use extension function from different context in Kotlin Here is an example of what I'd like to achieve: open class A { open fun Int.foo() { print("foo") } } object B: A() { val number = 5; override fun Int.foo() { print("overriden foo"); // I want to call the A.(Int.foo()) } } B.number.foo(); //outputs: "foooverriden foo" First of all, does anything like this exist? Can I somehow assume number to be in the context of class A in its override method? How would I write this? The more I think about it the...

How to modify the code so that the selection condition can be passed as an argument I have a code like this, needs to be modified in such a way that - the selection condition could be passed as an argument (one of the function arguments must be lambda with a value by default - the condition that was specified in your option). This program calculates the sum of digits in multiples of 3 Example: INPUT: 123456789 OUTPUT: 18 3+6+9 = 18 fun main() { val s = readLine(); println(s?.map(Character::getNumericValue)?.filter{ it.toInt() % 3 == 0 }?.sum()); }

Kotlin: does it make sense a property with private get and public set? I am new to Kotlin, and I have been experimenting with the language. In Kotlin in Action, it says the following: The accessor’s visibility by default is the same as the property’s. But you can change this if you need to, by putting a visibility modifier before the get or set keyword. I have tried to create a property that has a private getter and a public setter, as follows: class BackingField { var aProperty = 1 private get set(value) { field = value + 1...

Playing video/audio files from USB (kotlin please not java) I am trying to create an app that will play video/audio files from the usb when user connects it using android studio. Right now I am using raw folder to play the files. I am new to app development so I would appreciate some help with examples.

How can I delete colons in a string (KOTLIN) val macAddress = "15FACD8ABB" val macAddress2 = "15FACD8ABB" How can delete colons of a string and how can agree colons in a string?

NotSerializableException with redisson-spring-boot-starter I'm using redisson-spring-boot-starter 3.13.2 and Kotlin for cache but I get the following exception: java.lang.IllegalArgumentException: java.io.NotSerializableException: com.service.message.State at org.redisson.RedissonObject.encodeMapValue(RedissonObject.java:338) at org.redisson.RedissonMapCache.fastPutOperationAsync(RedissonMapCache.java:843) at org.redisson.RedissonMapCache.fastPutAsync(RedissonMapCache.java:746) at...

Android: await() seems not to work using Room database I am working on an app to practise some calculations which saves each given answers and data about practise sessions into a Room database for tracking progress. There is a table that contains the answers and there is a table which contains the sessions, and each row in answer table needs to contain the id of the session in which the answer was given I am using a Room database thus using coroutines when writing to database. When the user clicks a button the answer is evaluated and saved, and...

Convert ByteArray to PrivateKey in Kotlin I have a private key in raw format, a byte array : val privKeyIControlUInt8 = byteArrayOfInts( 0x00, 0x00, 0x00, 0x00, 0xB2, 0xC6, 0xFE, 0x9D, 0x1F, 0x87, 0x85, 0x8C, 0x00, 0x00, 0x00, 0x0A, 0x7D, 0x90, 0x8E, 0x1C, 0x11, 0x2D, 0x7B, 0xF9, 0x30, 0x8D, 0xF3, 0x8C, 0xD5, 0xC0, 0x41, 0xF0 ) I need to convert this array to a private key. I use this function : private fun generatePrivateKey(encodedPrivateKey: ByteArray):...

"None of the following functions can be called with the arguments supplied" - Why? The code below fails to compile due to the red underlined check screenshot added for the lambda parameter types, code: handledExceptions.forEach { exceptionClass -> exceptionClassToHandler.compute(exceptionClass.java) { clazz, existingHandler -> check(null == existingHandler) { "There's already a handler registered for ${clazz.name}" } { e: Throwable -> handlerMethod.invoke(bean,...

How to remake the program so that words are passed in function arguments in the KOTLIN programming language? Need to create a function that implements the attached algorithm, to which all words are passed in the function arguments. For example: f ("dfd" dd "ddd"); My code: fun main() { var s = readLine(); var w = Array(128){0} //To mark characters from a word 1 var g = Array(128){0}//When we encounter a space, we add units from the first array to the corresponding elements of the second, zeroing them in the first. if(s!=null) { for(c in s) {...

Kotlin: get List object from JSON string Exploring kotin possibilities at first time and a bit confused how to convert JSON string into List object. data.json is quite simple { "0" : "some picture", "1" : "other picture" } Trying to convert like this: val inputStream: InputStream = context?.assets?.open("data.json") ?: return null val size: Int = inputStream.available() val buffer = ByteArray(size) inputStream.read(buffer) val jsonString = String(buffer) println(jsonString) val gson = Gson()...

Why not work my search function - android Here is My Code : // this is for retrofit companion object { private fun retrofit(): ApiClient { return Retrofit.Builder() .baseUrl("http://192.168.43.106/") .addConverterFactory(GsonConverterFactory.create(GsonBuilder().create())) .build() .create(ApiClient::class.java) } suspend fun fetchAllData(repositoryCart: RepositoryCart): List { val retro =...

Pass Lambda function to C# generated code of Kotlin in Xamarin.Android binding library I've been trying to use my Android Library (written in Kotlin) in a Xamarin project but I'm stuck in passing Lambda functions to C# generated code of Kotlin I'm trying to do something like this client.DoSomething((response) => {}, (error) => {}); But I'm getting this error CS1660: Cannot convert lambda expression to type 'IFunction1' because it is not a delegate type This is the generated C# code for my library for this specific function using Android.Runtime; using Java.Interop; using...

Problem with Searchview inside Fragment (Kotlin) Hello guys i have encountered a problem in my app i am trying to use SearchView on a toolbar in my fragment but i cant figure out 2 things first of all why when im inflating the menu through onCreateOptionsMenu nothing happend? i need to inflate the menu through onCreateView with toolbar.inflatemenu second after im inflating the menu through onCreateOptionsMenu and onCreateView and using " inflater.inflate(R.menu.search_menu, menu) val searchItem = menu.findItem(R.id.SM) " i think...

Does android PhoneStateListener run on background? I'm currently working on an android application to monitor the incoming and outgoing calls from a phone and register the call info into a file, and from what I've read PhoneStateListener seems to do what I need. The thing is I need the application to run on background and I was thinking of using a service for that, but every example I've found that uses the listener declares it in the main activity, so I'm not sure if I need to create a service for it to run on background. For a little more...

Kotlin: Show/hide ImageView in Within a multiple choice quiz, I want an ImageView to show for some questions and be hidden for others. When I omit android:src in XML, the ImageView is hidden for all questions. When I set android:src, the ImageView shows for all questions. How can I set the image visibility dynamically? XML Data class data class Questions( val id: Int, val image: Int?, val question: String, val option1: String, val option2: String, val option3: String, val option4: String, val correctAnswer: Int)...

How to delete an item from Room Database and RecyclerView and updating the list Here I've a deleteButton to delete the desired the item from the database and recyclerview. In onSetClickListener of this deleteButton I am calling a function deletePlayerHistory(positon) and passing the position from onBindViewHolder() function for the item user want to delete. Adapter Class: class FriendHistoryAdapter(private var friendHistoryData: List) : RecyclerView.Adapter() { class FriendHistoryHolder(itemView: View) : RecyclerView.ViewHolder(itemView) { val...

Figure out where spring application is scanning for components Ok, so I want to use a ClassPathScanningCandidateComponentProvider to find components that have a method that is annotated with a custom annotation. I've done similar before. However, this time, I'm in a library that's being used by an application for which I can make no assumptions about the package names. In particular, respectively annotated classes may be in both the library I'm working in and the application that's using it. I.e. object AnnotatedClassesFinder { @JvmStatic fun <A...