Programmatically decide which arguments to pass to a function with default arguments? I try to implement a data driven test for a kotlin function that has several parameters with default values. In my test definitions I'd like to be able to leave out any combination of arguments that have a default argument in the function declaration. I don't see how that can work (without a separate branch for each combination of default values). Maybe it is better explained by code: import kotlin.test.assertEquals fun foobalize(start: Int = 0, separator: String = "\t", convert: Boolean...

Mockito does'nt mock repository i'm try to test my ViewModel with mockito. This is my TestClass: @RunWith(JUnit4::class) class RatesViewModelTest { @Rule @JvmField open val instantExecutorRule = InstantTaskExecutorRule() @Mock var observer: Observer? = null @Mock private lateinit var repository: RatesRepository private var currencyList = ArrayList() private lateinit var viewModel : RatesViewModel @Before fun setUp(){ MockitoAnnotations.initMocks(this) currencyList.add(CurrencyModel("BASE")) viewModel...

Retrofit: how to send value to RestApi and check if it's exists or not? Kotlin Android First of all I'm playing with Retrofit for the first time in kotlin android. So the Logic i want is like this: I want send a username to the RestApi. Then check if it is existed or not. if it's existed i want make Toas message saying true if not exised False. So, i have this json in this url:https://jsonplaceholder.typicode.com/users: [ { "id": 1, "name": "Leanne Graham", "username": "Bret", "email": "Sincere@april.biz" }, { "id": 2, "name": "Ervin Howell",...

How to associate multiple tables on Exposed Now I'm creating an API using Kotlin with Exposed, Ktor and Postgres. When I need to do some select on a table which is associated with another table I have to "parse" the ResultRow to an entity object. If this table have more associations I do have to repeat the association every time, what is weird. Is there an easy way to do it? Cuz I think to write a lot of code to create the objects it too much! Now I'm doing like this. fun ResultRow.toInterval() = Interval(...

how can i Migrate Realm without losing any data - Kotlin I've been trying to rename field or add new field to my realm database. But i'm getting error like this. I tried to debug my app it looks like oldVersion++ is not increasing the old schema version. Detailed Error is down below Any help would be appreciated. io.realm.exceptions.RealmMigrationNeededException: Migration is required due to the following errors: - Property 'TransferDetailModel.MainUniqueId' has been made optional. Migration.kt open class Migration : RealmMigration {...

Serialize data class ignoring key I have this class where at some point it will be serialized to a JSON string to be sent to an API. data class FieldValue( @JsonAdapter(StringOptionAdapter::class) var stringOption: StringOption?, @SerializedName("option") var objectOption: SomeObject ) { // some functions } class StringOption( val stringValue: String ) { } Currently, it generates this output: { "stringOption": "Some string" } What I'm needing is to remove the key so that the result is...

Exception 'android.system.ErrnoException' occurred in thread 'SharedPreferencesImpl-load' at libcore.io.Linux.access(Linux.java:-1) I am trying to work through building the google sunflower app and I am getting stuck loading my json file I think. I am unable to hit any break points which to me means that I am breaking on an error loading permissions maybe. I am debugging on an actual pizel 3 and I think perhaps I have my phone locked down too much. I have also tried adding reading permissions to the manifest file. Here is the code private fun buildDatabase(context: Context): AppDatabase { // create the...

Kotlin convert FileTime to day, month, year Problem: I have got a directory of files, which have a creation date. What I am trying to reach is to get the value of the creation date day, month and year. However, I am working with a FileTime. I was expecting to be able to call a GetMonth method or such. Unfortunately, this is not possible, does someone know a nice solution to get the day/month/year of a FileTime? What have I tried: I have tried to convert this to the Date type. This is possible, but here are the day, month and...

Kotlin object, an implementation vs instance In Objects in Kotlin: Create safe singletons in one line of code (KAD 27) Antonio Leiva states: In fact, an object is just a data type with a single implementation. I would expect to see the term instance rather than implementation used here. Is there some nuance that I am missing?

When unit testing my ViewModel, list always returns empty I'm trying to learn unit testing, I have my code factored into an MVVM(i) architecture, but when I run my testParseToList() test function, it always comes back with an empty list and I can't figure out why. I fear it may have something to do with the i part of the MVVM(i) and whether or not I'm correctly mocking my viewmodel. I'm starting with my most simple viewmodel in hopes to get a grasp of the concepts before moving onto my more complex ones. OfflineViewModelUnitTest.kt...

What does the keyword object mean in Kotlin? The Code A is from CameraXBasic I can't understand completely the code private val volumeDownReceiver = object : BroadcastReceiver(). I think the Code B will work well, but in fact it failed. What does the keyword object mean in Kotlin ? Code A private val volumeDownReceiver = object : BroadcastReceiver() {...

When scanning for Bluetooth devices on Android the device names returned are null (kotlin) As the title states I'm writing a personal, basic app, and when I scan for Bluetooth devices all I get are null devices. Not sure what could be causing this or how to fix it. Here's my code: private fun addDeviceToList(newDevice: BluetoothDevice) { // Add to the readable list if (newDevice.name != null) { // Add a device to the device list btDevices.add(newDevice)...

Using Transformations.map to observe a LiveData in my Repository from the ViewModel doesn't seem to work In particular, I have these LiveData objects in my Repository val liveDataA : MutableLiveData = MutableLiveData() val liveDataB : MutableLiveData = MutableLiveData() val liveDataC : MutableLiveData = MutableLiveData() ...that I intend to update using the following method in said Repository. suspend fun fetchProfile() { val profileDataApi = userApi.getProfile() liveDataA.postValue( profileDataApi.a ) liveDataB.postValue( profileDataApi.b ) liveDataC.postValue(...

How to calculate Glide image loading time? I want to calculate Glide image loading time, but there seems to be no way to get loading time. Currently, the RequestListener.onResourceReady is used to calculate the time, but this is not accurate when the list is swiped or the app is returned to the background. var start = System.currentTimeMillis() placeholder?.let { creator.placeholder(placeholder) } error?.let { creator.error(error) } creator.config(Bitmap.Config.RGB_565) creator.fit().into(image, object :...

Why does a member function invocation not infer a required receiver from the calling function? Consider: class Foo { fun CoroutineScope.foo() { } } class Bar { val f = Foo() fun CoroutineScope.bar() { // this could also be "suspend fun bar = coroutineScope {" f.foo() // unresolved reference with (f) { foo() // OK } with (f) { with(this) { foo() // OK } } } } It seems like the first attempt at f.foo() should infer the CoroutineScope receiver specified on...

Tint menu icons based on if condition I have a toolbar: The add (1) and save (3) buttons should be a green colour when enabled. The clear (2) should be red when enabled. All should be grey when disabled. I can't seem to find a way to colour these as stated. I am using the tint when adding the toolbar into the screen: app:itemIconTint="@drawable/toolbar_selector" app:itemTextColor="@drawable/toolbar_selector" However this only sets checked and standard colour. There doesn't seem to be a way to specify...

Understanding how "by" works as a delegate The following code shows a delegate: override val vm: MyViewModel by viewModel() inline fun LifecycleOwner.viewModel( key: String? = null, name: String? = null, noinline parameters: ParameterDefinition = emptyParameterDefinition() ) = viewModelByClass(T::class, key, name, null, parameters) I don't really understand what is happening when you have by viewModel Does viewModel() cause the inline function to be called and its return value assigned to the variable vm?

How can I force user to enter emoji only in edittext I'm using androidx.emoji.widget.EmojiEditText. I want to force user to enter only emojis here. And limit him to max 3 emojis. How can I do something like this? I tried to use external emoji keyboard that cancels the soft keyboard and shows up but didn't work properly.

java.lang.IllegalArgumentException: No view found for id 0x7f0d0037 for fragment I'm working in an app where I have to implement onClick method on fragment. When button is clicked I want to open another fragment, but I'm facing an error with fragment id. I used fragment manager and fragment transaction in onClick method like below: val fm = childFragmentManager val ft = fm.beginTransaction() ft.add(R.layout.fragment_extended_subscribers, ExtendedSubscribersFragment()) ft.addToBackStack(null) ft.commit() I also tried to add an id...

Realm Java sorting makes changelistener slow When I have a list with a bigger amount of elements (around 7000) and I add sorting to the query, change listeners are getting very slow. This is not the case when only one field is given. From the second field it slows down a lot. It also seems to depend on what field type is given to sorting. Booleans seem to be quite fast. Dates are also slower when only one is used. Let me show you what I do: very simple query on all objects with multiple sorting elements: val theList =...

After adding dependencies having this error, anyone know how to fix? I am trying to create a new project based on MVVM and was adding all the dependencies needed. This is what i had added and done so far : Added dependencies inside gradle file Added plugin Enabled dataBinding to true Added classpath in gradle file classpath "androidx.navigationnavigation safe args gradle plugin2.1.0-alpha05" Added android.databinding.enableV2=true inside gradle.properties I am following guide from this youtube playlist : <a...

What will be scenarios if I implement the network check like following? Am trying to check my Internet availability before making API calls. But found out some of the methods are deprecated so found one solution on my own and it's working fine. But need to know about it's long term use. fun isNetworkAvailable(context: Context): Boolean { var isNetwork: Boolean = false val connectivityManager = context .getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager val activeNetwork = connectivityManager.activeNetwork...

Unable to create database in my android app I would like to create an application with a SQlLite database but I do not know why I can not create the database

class Db_Connection(context: Context?) :
    SQLiteOpenHelper(context,"my_db",null, 1) {

override fun onCreate(p0: SQLiteDatabase?) {

    var create_Table =
        "Create Table product( id INTEGER PRIMARY KEY AUTOINCREMENT ,  name TEXT)"
    p0!!.execSQL(create_Table)
}

override fun onUpgrade(p0: SQLiteDatabase?, p1: Int, p2: Int) {
}

override fun...

&lt;![CDATA["'"]]&gt; returns two result. Some app version print "'", another app version print '. Why? I used in string.xml. And used like getText(R.string.something). Some app version print that string like "'". And another app version print like '. Search that keyword 'android', 'CDATA', 'quote', 'getText', 'update' example Timber.d(getText(R.id.example)) // some app print "'" // another app print ' That code returned ' before. But after version upgrading some libraries related to GTM and glide, that code returns "'".

Animation BottomNavigationView doesn't work When I click on BottomNavigationView item it doesn't animate on some version (for example Marshallow) The code: build.gradle (app) //AndroidX UI implementation "com.google.android.materialmaterial1.0.0" implementation "androidx.appcompatappcompat1.1.0" activity.xml menu_item.xml nav_bottombar_item.xml HomeActivity.kt bottomNavigationView.setOnNavigationItemSelectedListener { when(it.itemId) { R.id.action_1 ->...

How to highlight a settings row in Android? I'm trying to implement the fingerprint authentication and I want to make the user register a new fingerprint if He hasn't one. I know how to start an Intent to the Security Settings menu, but I can't find anywhere how to highlight the option I want the user to click. Do you think it's possible? Thanks for your help

how to update data in BaseAdapter? My application periodically check updated live show from my server. When the app loads, it gets a JSON file from my server, and make the list. It works until this moment. However, when the data from my server changes (i.e. change in wordings or count), the list on my app does not update. MovieList.refresh() does refresh MovieList.list. PreferenceList.list does not change at all. I have tried calling adapter notifyDataSetChanged(), but no effect at all. May I know how to update the list...

Android DataBindingUtil.inflate causes InvocationTargetException I'm working on an android application that registers consumptions of materials for production in warehouses. I am using Androids UI Navigation architecture component to handle the navigation within the app. In every Fragment I am using the same onCreateView function: override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { binding = DataBindingUtil.inflate(inflater, R.layout.fragment_layout, container, false) return...

Unit test for flatmap kotlin I want to create unit test for my presenter. but I don't know how to write unit test for flatmap. I already try solution at bottom but got error --> got error java.lang.NullPointerException public void submit(final NameRequest request, final AgeRequest ageRequest) { model.getAccountName(request) .flatMap(new Function() { @Override public Observable apply(NameResponse response) throws Exception...

How to avoid deadlocks using subprocesses in Java Java subprocesses use limited-size buffers to bind stdout and stderr to its InputStreams. In case of sequential reading it can cause deadlock, when we are blocked on waiting end of one stream and the process is blocked waiting other stream become available to write to. Also, I need to specify charset to decode Process' output explicitly to decode possible cyrillic, that encoded in 866 in Windows' cmd. In my ProcessHandler I tried to use thread pool and delegate output and errors properties...