How can I change the row height in my RecyclerView after Picasso image load? I currently have a RecyclerView containing posts (similar to facebook posts or tweets etc), with optional images. In the onBindViewHolder method of my adapter, I'm loading the image using Picasso but I won't know the size of the image until it has loaded. I want the post to appear normal (without an image) until the image has loaded, then the image should appear and the row height should increase to fit the new image. At the moment when the image is loading, it's remaining attached to the...

Program type already present: kotlin.AutoCloseable Kt I'm still struggling with rebuilding an existing android application with kotlin. Altough there are no semantic errors I'm not able to compile the project. The Compiler allways stopps with following issue: Program type already present: kotlin.AutoCloseableKt

When we start new activity into kotlin why we put .java in intent instead of .kt As per kotlin doc we start new activity with following syntax startActivity(Intent(this@MainActivity, NextActivity::class.java)) its kotlin so why we add .java after the the class ? why not kt?

How to pass a variable from an activity to a previous dialog not in the activity - Androidstudio I haven't seen any cases like this. I have an activity which is initiated from a button on a dialog. I need to get a variable from this activity, close it, and pass it back to the dialog. What would be my approach? class ColorPickDialog(val activity: Activity, color: Int, val callback: (color: Int) -> Unit) { lateinit var savedColorsButton: Button val currentColorHsv = FloatArray(3) init { Color.colorToHSV(color, currentColorHsv) val view =...

does IO in coroutines cause suspension? Inside a coroutine I am doing a http-request with OkHttpClient. The request is done from a function that has the suspend keyword: suspend fun doSomethingFromHttp(someParam:String): Something { ... val response = HttpReader.get(url) return unmarshalSomething(response)!! } I assume that the function can be suspended on entry since it has the suspend keyword, but will the coroutine also be suspended when doing the http-request? What about other kinds of blocking IO?

Flink: How to process rest of finite stream with combination of countWindowAll() //assume following logic val source = arrayOf(1,2,3,4,5,6,7,8,9,10,11,12) // total 12 elements val env = StreamExecutionEnvironment.createLocalEnvironment(1); val input = env.fromCollection(source) .countWindowAll(5) .aggregate(...) // pack them to List for bulk upload to DB .addSink(...) // sends bulk When i execute it - only first 10 processed, but rest 2 elements are thrown away - flink shutdown without processing of them. The only avoid for me - while i totally...

How to check if the result of an expression is used in a custom Android lint rule I'm trying to write a lint rule to catch places where the result of an RxJava2 function is not used in anyway. For example: final Observable observable = getObservable(); observable.subscribe(this::onSuccess, this::onError); In RxJava2, the subscribe function returns a Disposable that should be used to unsubscribe if the program/class instance "finishes" in some way in order to prevent memory leaks. I want to fail my build if any occurences like this are found. This particular method (and...

java.lang.NoClassDefFoundError: android.databinding.DataBinderMapperImpl when running Espresso tests Data binding setup: apply plugin: 'kotlin-kapt' android { dataBinding { enabled = true } } dependencies { kapt "com.android.databindingcompiler3.1.0" } The fragment class which uses data binding: class LandingFragment : Fragment(), Injectable { override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { val dataBinding = LandingFragmentBinding.inflate(inflater, container,...

Kotlin Extensions property vs. function - Conflict I have the two following definitions. The first one as an extension function allowing to set visible a View and also to set it as gone or invisible with the second parameter. fun View.setVisible(visible: Boolean, goneWhenVisibleFalse: Boolean) { visibility = when { visible -> View.VISIBLE goneWhenVisibleFalse -> View.GONE else -> View.INVISIBLE } } The second here, as an extension property using the first above. var View.visible: Boolean get() =...

Android Studio - Kotlin Tests Throwing - Class not found - Empty test suite When trying to run espresso tests written in Kotlin on Android Studio (as far as 3.2 Canary 9), I'm getting the error: Process finished with exit code 1 Class not found: "com.myproject.directoryofwinning.VerifyAppIsAwesomeTest"Empty test suite. Strangely, Java tests in the same project have no issues. Have tried to reset the configurations and suggested by others, but this doesn't seem to make any difference.

Kotlin function argument accepting 2/more types How do you create a function that accepts 2 or more types as an argument in Kotlin? Like, how can you create a GCD function that accepts all integer types?

Why can't I override this property of a Java class in Kotlin? I wrote a small subclass of java.time.Clock in Kotlin. This version of it works: class TestClock( var instant: Instant = Instant.ofEpochSecond(0), zone: ZoneId = ZoneId.of("UTC") ) : Clock() { private val zone = zone override fun getZone(): ZoneId = zone override fun withZone(zone: ZoneId): Clock = if (zone == this.zone) this else TestClock(instant, zone) override fun instant(): Instant = instant } but if I try to remove the redundancy around the zone...

NumberFormatException, from JSON to TypeToken (Kotlin) I have a data class that looks like this: data class MyData (val myNumber : String, var myDate : Date?) : Serializable I am storing an array of this in SharedPreferences, and load it back like this: private fun GetMyDataArray(): ArrayList? { val json = sharedPrefs!!.getString(STORED_DATA_KEY, "") val caseType = object : TypeToken() {}.type return Gson().fromJson(json, caseType) } 99% of the time this works fine, but on some user's devices it is crashing...

Grouping classes in kotlin I have a class called as Student, with three fields, I need to convert that class into a GroupedStudent. How can this be achieved? var students: List = mutableListOf(Student("A", "X", 1), Student("A", "Y", 2), Student("B", "X", 2), Student("B", "Y", 2)) I need to convert the above list to a GroupedStudent List, how can i do that? class Student { var name: String var subject: String var marks: Int } class GroupedStudent { var name: String var subMarks: MutableList }...

android mvvm massive number of observers this is a very subjective question. I'm finally getting more used to MVVM (Model View Viewmodel) (or at least I think so), and whats happening now is that I'm adding more and more MutableLiveData objects in the ViewModel and observing then right from the Activity onCreate. I'm not truly sure if that's beneficial, or if that's noise from MVVM, or even if I'm taking a wrong approach, or even worst, there might be too much responsibilities to my class. This is one of my methods called from...

How to run a function from one class in another class in Android Studio [Kotlin]? I am working on a new android studio project, but I am still very new to it all. I am trying to save user preferences for language, so I have a preferences class with a setter and getter for language, as well as a separate Language activity where the user actually picks which language they want. From this language activity, I want to use the setter to set the user's chosen language preference within the preferences class. Here is the preferences class: class Preferences (context: Context)...

Java annotation implementation to Kotlin I am trying to replicate the implementation of @Age constraint(found it on online) from Java to Kotlin, I copied the java code base and used the IDE to convert it Kotlin code. Java code @Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE }) @Retention(RUNTIME) @Repeatable(Age.List.class) @Documented @Constraint(validatedBy = { }) public @interface Age { String message() default "Must be greater than {value}"; Class[] groups() default { }; Class

Can't use Expand or Fill Tables In Tree Nodes I'm trying to get my Tables to fill the space of a Tree node, however it seems to just shrink to the space given: I want to get it similar to this, where the Label has expanded: What I've done here is added a Table() into a Tree.Node(). This Table has a Label() and...

How to abstract a change activity logic where I just need to change activity without adding anything in the intent? I have a simple activity, when it creates, it will do some check, and maybe switch to another activity if user is not login. If I do something like this, it works: class HomeActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_home) if (userPreference?.memberRegistered == false) { val intent = Intent(this, AuthActivity::class.java)...

Check whether I added kotlin support in my android project [duplicate] This question already has an answer here: How to Use Kotlin in an Existing Android App? 2 answers I created a project, and I'm not sure if I included Kotlin support. How can I check if I did include it...

How to convert bitmap to base64 kotlin but not work "encodeToString" fun convert(bitmap: Bitmap): String { val outputStream = ByteArrayOutputStream() bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream) return Base64.encodeToString(outputStream.toByteArray(), Base64.DEFAULT) } Error on Base64.encodeToString(outputStream.toByteArray(), Base64.DEFAULT)

rxjava combineLatest in Kotlin style I am new in kotlin coroutines. Like in RXJAVA we have combineLatest operator for updating old response. First data will be fetched from local database(update the UI) and new data will come from server after hitting the network request(update the UI with new data). How can I get the same functionality using Kotlin without using callback hell.

How to fix concurent modification exception in kotlin This is my code from which i adding data in list fun bindProcess(listOfDocId: MutableList, isActvityLogEnabled: Boolean): Observable { return Observable.create { var filteredList =CopyOnWriteArrayList()// mutableListOf() val headerItem: SearchResultModel = SearchResultModel() headerItem.type = 0 headerItem.title = context.getString(R.string.top_matches_label) filteredList.add(headerItem)...

What is meaning of ! operator in Kotlin RxJava Flowable? What is the difference between Flowable and Flowable in Kotlin using Rx ?

kotlin generic in child class and parent class I want to convert this java class to kotlin package com.mkhaleghy.cinema.adapter; import android.content.Context; import android.support.v7.widget.RecyclerView; import android.util.SparseArray; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import com.mkhaleghy.cinema.R; import com.mkhaleghy.cinema.daylist.Movie; import java.util.ArrayList; import java.util.HashMap; import java.util.List; public class RecyclerAdapter extends...

Refer to file variable by FileName.variable Kotlin I have a file, where the variables are "static" in java sense, and I want to access them by the file name. I am giving an example. private var user:User?= null// this is put directly inside the file fun saveMe(user: User?){ saveObject(user, USER_FILE) FileStorage.user = user// this method is not allowed. How to access the top level user variable from here? } I don't know if this has been asked before, I guess the question is clear, about accessing the top level variable from a...

Actual close() method is called although Realm is mocked I have a fairly simple save() method to persist a RealmModel, after saving realm.close() is called because the database is no longer needed. The problem: The actual close() method is called although Realm is mocked using mockito. This causes an exception: IllegalStateException: Realm access from incorrect thread. Realm instance can only be closed on the thread it was created. Is mockito not able to mock Realm? I don't want to include PowerMock just for testing this case :D The...

cant access variable from another class (kotlin - java) I am trying to access some variable in Quote class using kotlin but kotlin always need an initializer, how can I initialize a class in kotlin? here is my Quote public class Quote implements Serializable{ public int id; public String code; public String name; public String c_change; public Materials[] materials; } heres some of the things I have tried private val quote: Quote private val quote: Quote = Quote() private val quote: Quote? = null private val quote: Array...

How to test CompletableEmitter.tryOnError() I have next code: inline fun completable(crossinline action: () -> Unit) = completable(action, {}) inline fun completable( crossinline action: () -> Unit, crossinline finally: () -> Unit ): Completable { return Completable.create { emitter -> try { action() emitter.onComplete() } catch (t: Throwable) { // Attempts to emit the specified {@code Throwable} error if the downstream // hasn't cancelled the...

Binding views in android using kotlin Whats the difference between the below two ways of binding views in android using kotlin?And which one is better? TextView tvSelectDistance=findViewById(R.id.tvSelectDistance) as TextView vs TextView tvSelectDistance=findViewById(R.id.tvSelectDistance)