Unit testing viewmodel in android using mockito MVVM pattern This is my repository class class UserRepository (private val apiInterface: ApiInterface, private val utils: Utils) { fun makeLoginOnServer(userName: String , password : String): Single? { val hasConnection = utils.isConnectedToInternet() var observableFromApi: Single? = null if (hasConnection) { observableFromApi = loginUser(userName,password) } return if (hasConnection) observableFromApi!! else null } private fun loginUser(userName: String...

Cannot reach class parameter in function I cannot reach class parameter (application) in class function. Explain please what's the reasoning behind that? Why parameter is accessable within class body but isn't from class function? class VM_MainActivity(application: Application) : AndroidViewModel(application) { val taskEntities:List?= Repository(application.applicationContext).taskEntities //"application" is reachable fun fillWithSampleData() { Repository(application.applicationContext).fillDBwithSampleData() //error:...

How to generate 33-byte compressed NIST P-256 public key? I need to generate such public key and do the additional signing of the bytes (which will include this generated previously key) I need to construct bytes of: ASN.1 prefix + signature of (33-byte compressed NIST P-256 public key) The signature should be delivered from other defined private key The ECDSA specifications: ● Curve: NIST P-256 Otherwise known as secp256r1 and prime256v1 (openssl) ● Signature format ASN.1. The r and s values of the ECDSA signature must be positive...

how to add contact in mobile contact list using content provider kolin android? how to add contact in mobile contact list using content provider please help me here is an error val res = contentResolver.applyBatch(ContactsContract.AUTHORITY, ops)

Banner Ads not displaying on main activity but on other its showing I've been trying to display banner ads on my main activity with a listview but it is not displaying. The ads are loaded no because I make a listener to it. There is no runtime error, just the ads are not shown. But on the other activity banner is displaying correctly. Interstitial ads are also working. The main activity has a navigation drawer. I am using test ads. The app is about searching for songs and displaying lyrics This is the code of MainActivity import...

dataBinding using custom attribute I have following custom attribute dataBinding : object BindingsAdapter { @JvmStatic @BindingAdapter("imageUrl") fun bindImage(imageView: ImageView, url: String?) { Glide.with(imageView.context) .asBitmap() .load("${MovieViewHolder.BASE_BACKDROP_PATH}$url") .apply(RequestOptions().centerCrop()) .into(object : BitmapImageViewTarget(imageView) { override fun onResourceReady(bitmap: Bitmap,...

I do not receive changes to onChange when inserting data into the database I'm trying to write applications with mvvm architecture. But I do not receive changes in onChange when I insert data into a database. The logic that I want to achieve: Go to the cache, take the data. Then we go to the server and receive data. If there are changes, update both the cache and ui. Tell me what I'm doing wrong? class PageFragment : BaseFragment() { private val pageName= "fly" override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState:...

Why DrawerLayout doesnt work when Arcore fragment is working? Problem Before than I tap the screen to init ARcore my DrawerLayout works perfectly but when I init ARcore and then I try to open the Drawer Menu It doesnt open I dont understand why, I think it is a problem with ARcore maybe. Some idea ? Layout Code class MainActivity : AppCompatActivity() { private val arFragment: ArFragment by lazy { supportFragmentManager.findFragmentById(R.id.ar_fragment) as ArFragment } private val drawerLayout: DrawerLayout...

room db update multiple rows with @query I would like to update multiple rows in a room database. But I don't have the objects - I have only the ids. If I update one row I write something like this to my DAO: @Query("UPDATE items SET place = :new_place WHERE id = :id;") fun updateItemPlace(id:Int, new_place:String) With multiple rows I would need something like this: @Query("UPDATE items SET place = :new_place WHERE id = :ids;") fun updateItemPlaces(ids:List, new_place:String) OR @Query("UPDATE items SET place = :new_place...

Spring Boot ConfigurationProperties cannot be Autowired in Koltin [kotlin.UninitializedPropertyAccessException] I would like to retrieve the values of default settings when a user registers from the properties file. To do so, I've created a class to manage custom properties DefaultProperties.kt @PropertySource("classpath:config/defaults.yml") @ConfigurationProperties("app.defaults") class DefaultProperties { lateinit var settings: Settings class Settings { lateinit var keys: Keys var language: String = "en-US" var timezone: String = "GMT" var...

Passing data from fragment to its activity I am trying to pass some code from a fragment that I have into its base activity and then later I will pass it from that activity into another activity. That seems like the best way to do it. Instead of passing from a fragment to a random new activity. I have a fragment with the following code: import android.content.Context import android.os.Bundle import android.support.v4.app.Fragment import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import...

Android Studio Kotlin I'm sure this is answered somewhere, but I've looked forever now and I can't find an answer. I'm new to android development, and i'm using kotlin. I'm trying to use an if statement to call a function, but the only place it will let me use the if statement is within the OnCreate method. But I want it to run while the app is running, not just when the app starts. How can I fix this?

Type inference failed: Cannot infer parameter type in V Can someone tell me how to fix this code? The bolded code is the problem in my coding. if (!TextUtils.isEmpty(message)) { val notificationMessage = HashMap() notificationMessage["message"] = message notificationMessage["from"]= mCurrentId mFirestore.collection("Users/$mUserId/Notifications").add(notificationMessage).addOnSuccessListener { Toast.makeText(this@SendActivity, "Notification Sent",...

a simple birth year calculator using kotlin i start doing a simple android app for practice to calculate the age with Kotlin programming language , the error came from line "34" , can someone help me with this and fix it to know where is my wrong because am just very beginner package com.calcult.age.agecalcult import android.support.v7.app.AppCompatActivity import android.os.Bundle import android.widget.Toast import kotlinx.android.synthetic.main.activity_main.* import java.util.* class MainActivity : AppCompatActivity() {...

How to hide the icon in TimePickerDialog? Hi i would like to hide the keyboard icon in timepicker, is it possible? Thankyou]

Error : Could not find org.jetbrains.kotlin:kotlin-stdlib-jre8:1.3.10. in Android Studio 3.3 RC 1 When update android studio to 3.3 RC 1 and build the project (run perfectly in previous version of android studio) then its show me following error: ERROR: The Android Gradle plugin supports only Kotlin Gradle plugin version 1.3.0 and higher. The following dependencies do not satisfy the required version: root project 'GPS_Speedometer_material' -> org.jetbrains.kotlinkotlin gradle plugin1.2.71 according to this error I have update the kotlin version 1.2.17 to 1.3.0 but it show me...

Unable to invoke no-args constructor for java.lang.Enum<T> I am facing one issue with enum in Kotlin. Issue seems like silly but may be i am missing some code snippet to make it work. This is my json data "CustomerData": [ { "token": "token_data1", "role": "Admin" }, { "contactUUID": "token_data2", "role": "User" } ] One Kotlin data class as below @JsonInclude enum class UserRole(val userRoleDesc: String) { @SerializedName("Admin") ADMIN("Admin"), @SerializedName("User")...

Kotlin shorthand for implementing a functional interface with annotations In Kotlin, is there a way to define an annotated class implementing a functional interface that is shorter than the following: @Foo class Bar : Runnable { override fun run() = ... } I'm hoping to find something like the following made-up syntax: @Foo fun Bar : Runnable () = ... Due to interoperability reasons, I must end up with a class annotated with @Foo implementing Runnable or an instance of a class annotated with @Foo implementing Runnable.

Specific KClass from Start projection collection I'm trying to build a Synchronization class to which external modules can register, but I can't make the generics part work. External modules will register SynchronizationBundle on a Synchronizator, which should then handle the synchronization. interface Synchronizable object SynchronizationBundles { val bundles: MutableMap = mutableMapOf() fun register(kClass: KClass, bundle: SynchronizableBundle) { bundles[kClass] = bundle } @Suppress("UNCHECKED_CAST")...

What is the idiomatic way of creating instance of external interface in Kotlin JS Example: In @material-ui/core/createMuiTheme.d.ts there are a few interfaces defined, e.g. ThemeOptions and Theme It's possible to generate koltin bindings using ts2kt and it allows using createMuiTheme function to create Theme from ThemeOptions, but what is a correct [aka type safe] way of instantiating ThemeOptions which is an external interface and it doesn't have a I created a data class that implements the interface and instantiate it. Sometimes I need to use the instance as dynamic...

Kotlin - Why do we have to explicit type parameter(s) for generic method? I'm working on extension method like this: infix fun T.isNullOr(other: T): Boolean { if (this == null) return true return this == other } and I'm trying to use this method like this. val thisShouldWork = true isNullOr true // this is true val thisShouldNotWork = true isNullOr 0 // No compilation errors? I expected compilation error because type parameter is automatically set to Boolean for isNullOr but it wasn't. What's happening? am I misunderstanding about it? in...

Question about images (Kotlin) : choose best format What kind of format should I use for the image of an android app ? Sometimes I see png, xml of "pure" svg, it confuses me. What is the best practice and why ?

Rating Progress chart with 5 progress bar I need to draw a rating chart for my reviews on app. separatly for every star like 1,2,3,4, and 5. for reference i uploaded a image please suggest me n=best way.

fatel error check internet connection in kotlin my app working fine any without problem , i used AsyncTask to get data json and every thing is fine . i want to add code to check internet connection in my app and i put code under onCreate in main activity . val cm = baseContext.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager val networkInfo = cm.activeNetworkInfo if (networkInfo != null && networkInfo.isConnected){ if (networkInfo.type == ConnectivityManager.TYPE_WIFI){...

Reduce an array into a single integer causes type error I'm trying to take an array of Pairs(StartTime:Int, EndTime:Int) and reduce them to the accumulation of time for each session. fun main() { val sessionsInSecond = listOf(Pair(10,12), Pair(10,15)) val timeSpan: Int = sessionsInSecond.reduce{acc, it -> acc + (it.second - it.first) } println(timeSpan) } This gives me the following error: Unresolved reference. None of the following candidates is applicable because of receiver type mismatch: @InlineOnly public inline...

Kotlin : Activate author template in android studio I am starting to work on the Kotlin project. So, whenever I create a new file I do not get author template by default. I want to know that how to activate author template in the android studio for Kotlin.

when i run my application the data will not add into my contacts Wwhen I run my application the data is not added to my contacts. But when I debug my application then the contact will be added to the contact list so how to solve this problem? private var TAG = "PhoneActivityTAG" internal var activity: Activity = this@MainActivity private var wantPermission = Manifest.permission.WRITE_CONTACTS private val PERMISSION_REQUEST_CODE = 1 val ops = ArrayList() val rawContactInsertIndex = ops.size ops.add(...

android kotlin - app keep keeps stopping when i click the button I start doing a simple android app for practice to calculate the age with Kotlin programming language, when i click the button the app, can someone help me with this and fix it to know where is my wrong because I am just very beginner package com.calcult.age.agecalcult import android.support.v7.app.AppCompatActivity import android.os.Bundle import android.widget.Toast import kotlinx.android.synthetic.main.activity_main.* import java.util.* class MainActivity :...

How to reset Hystrix Circuit Breaker completely before every unit tests? I have some test cases, and also have a test where i want to test that CB get triggered. But every time i run the tests, sometimes it fails, some times it passed. I understand that i need to reset hystrix, but how can i do that? Thanx

Switch in expandable listview android I have an Expandable List View with some groups that contain a Switch in its child view. So, when I select one switch button from one group, then other buttons from same group should not be selected. I am trying to find the solutions but i didn't find it so if anyone knows how to do it. please help me thank you in advance Adapter Class override fun getChildView( groupPosition: Int, childPosition: Int, isLastChild: Boolean, convertView: View?, parent: ViewGroup ): View { var...