How to set foreignKey in room? I have two tables in my Room database, one is the info about a docs and another is the body with items from that docs. Each item belong to a doc and when a doc is deleted i have to delete all items which belong to that doc. My model looks like this: @Entity(table= "testata") data class Testata( @PrimaryKey(autoGenerate = true) var id: Int, var desc: String ... ) And the model of items looks like this: @Entity(tableName = "corpo") data class Corpo( @PrimaryKey(autoGenerate = false)...

Pass setOf as Parameter to a function. How can that be accomplished? I have to write a function, which takes three sets a parameter. The signatur looks this way: fun twoInThree(a: setOf, b: setOf, c: setOf): setOf {} But it doesn't seem possible. The compiler complains. With ArrayList it would possible theoretically. What am I doing wrong? How can the desired declaration be accomplished?

Picasso not loading image for the first time on a map icon in Kotlin I am using Picasso library with an updated version, implementation 'com.squareup.picassopicasso2.71828' every place work fine but on a map, it does not load the image the first time, This means if I open this screen the second time its loads all of the images. its my code fun createCustomMarker(imageUrl: String): Bitmap { val markerLayout: View = layoutInflater.inflate(R.layout.partial_custom_marker, null) val markerImage: CircleImageView = markerLayout.findViewById(R.id.user_dp)...

How to reset BluetoothSocket input and output streams I have an two android apps written with Kotlin - one acts as classic bluetooth server and the other as classic bluetooth client, using BluetoothSocket class. I can establish a connection and I use it to send images from server as a reply to requests from the client, and it might take a several seconds to send all the images for a single request, the server sends every image in one single write operation to the output stream but the client gets it divided into parts of 990 bytes at most. My...

How to compare date and time in kotlin android? I have an app on the PlayStore and I am building a feature where the user will not see ads more than a specific number in one day. I am thinking about comparing the current date and time to the previously saved one but haven't find a proper way to do that. How can I compare date and time to know if 24 hours have passed or not? Some posts that I found but not helpful: <a href="https://droidbyme.medium.com/compare-date-calendar-or-string-date-c6368d57119e" rel="nofollow...

How to make an ImageButton disappear when disabled using only xml? This is my first android project, Matter of fact first programming project ever. I have an ImageButton that I want to hide when it's disabled, The enabled/disabled state is done using xml connection to a viewmodel, so I can't reference the fragment to do it programmatically. I tried using a selectorlist to pass in a grayed out version of the image, but I want to hide the button completely not just the src image. the button in the fragment layout: The variable controlling the...

OkHttp3 RequestBody for sending an .apk file val client = OkHttpClient.Builder() .build() apkPathstring : String = "somePathToMyApk/myApk.apk" val file = File (apkPathString) val requestBody : RequestBody = RequestBody.create(MediaType.parse("?????"), file) val request = Request.Builder() .url("someUrl") .post(requestBody) .build() I can find examples for requestBody when sending a .txt, or an image (.png) etc. but I can not seem to be able to find an example for sending an .apk file...

Level map screens in native android [closed] How can i create level map screen in native android using kotlin? Some like this

start sub navigation graph for result i am using navigation component for the app i am working on currently , i ran into a problem with navigation graph and sub navigation graphs. basically i have sub_nav_graph_1 and sub_nav_graph_2 , each does a simple flow and then pops all the way back to the fragment which initiated it , problem is when i needed to create a flow that goes like following , while im in fragment number 2 in sub_nav_graph_1 , i want to start flow of sub_nav_graph_2 all the way to the end but when it ends i want...

Kotlin SparseArray is null while run unitTest I have a unittest for a kotlin object use sparseArray. When i debuged, it ran through the init for array but result still being null. Please help me to solve this problem. Thank you~

Only getting null from API Kotlin I'm making an android app using Kotlin where one of the features are getting a random drink from an API called The CocktailDB. But when I'm prompting the drink and its attributes it only says null. How to solve this? My Drink class: package com.example.drinkify.uhm import com.google.gson.annotations.SerializedName class Drink { @SerializedName("idDrink") val idDrink: String? = null @SerializedName("strDrink") val strDrink: String? = null...

Padding toolbar's logo in Android I have a small logo in toolbar, and I want to padding toolbar logo to right, but when I use app:contentInsetRight="0dp" app:contentInsetStart="0dp" nothing change in toolbar, any idea? Screenshot: MainActivity:

please help me understand why rider isn't being recognized in this kotlin code this is the XML which seems okay //this the XML code for the button I created that I would like to declare in the main activity page this is the code I was trying to execute but was not successful since it keeps bring an error of val not recognised with in the code main activity kt class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val...

what is the true display size? val wservice = getSystemService(Context.WINDOW_SERVICE) as WindowManager val metrics001 = wservice.currentWindowMetrics val windowsInsets = metrics001.windowInsets val insets = windowsInsets.getInsets(WindowInsets.Type.displayCutout() ) val bounds = metrics001.bounds val insetwidth = insets.right + insets.left val insetheight = insets.top + insets.bottom val size = Size(bounds.width() - insetwidth, bounds.height() - insetheight) val metrics = resources.displayMetrics I determined the size of...

Fill a GridLayout from Kotlin I'm android studio noob. I'm trying to fill a grid layout from kotlin activity. My code for the xml is this: In the MainActivity there is a for to create every buttom like this: for (i in 1..10){ val button = Button(this) button.text = "Boton: " + i // GridLayout.add(Buttom) } Who can I do it? Thank you

Micronaut + Maven - Environment variables I am working on a Micronaut + Maven project. I need to parametrize some values of my application.yml such as passwords and connection strings, to avoid committing them. I know values can be parametrized this way: secret-value: '${SECRET_VALUE}' But i cant find any other way to set SECRET_VALUE except setting bash value in .bashrc or .profile or .envoirment script files. I would like to use a .env file somehow, in order to commit a .env.example file in git repo. Any thoughts?

Fail to run robolectric unit test from CLI, saying that tests not found recently I am learning to write unit test with Robolectric framework. However, when I try to run a single test class from CLI using ./gradlew testDebugUnitTest --tests "com.a.b.c.d.e.f.DemoTest" , such that DemoTest is run with RobolectricTestRunner. It is always failed to run and I get the error message of tests are not found. But if i remove @RunWith(RobolectricTestRunner::class), it will be fine. Does anyone know if there is any potentially missing configuration that cause the issue, or...

MissingPluginException(No implementation found for method getDeviceInfo on channel com.flutter.dev/device) I have copied my project & changed the package then I am getting the below error. I have used "flutter clean" & restart IDE but still now the same issue. 2 E/UIFirst (11729): failed to open /proc/11729/stuck_info, No such file or directory I/flutter (11729): MissingPluginException(No implementation found for method getDeviceInfo on channel com.flutter.dev/device) E/UIFirst (11729): failed to open /proc/11729/stuck_info, No such file or directory I/Choreographer(11729): Skipped 1 frames! The...

How can we save a file of any type from an InputStream using Kotlin for Android? Context: My project is in the space of WiFi P2P/ WiFi Direct. I have found and followed some useful tutorials and questions and have a working app for sending Images between phones. A socket is opened and an OutputStream sent to the other device. Device 2 receives the stream and has to assume the mime Type in order to compress and save to a file. I would now like to open up this feature to transfer a file of any (common) type and have the other device happily receive it and stash it in the...

Type mismatch. Required: List&lt;DogResponse&gt; Found: List&lt;String&gt; in kotlin retrofit I am developing a new android where I am getting images by using retrofit in android but I am getting the following errors below following my json structure json structure below my DogResponse data class data class DogResponse( @SerializedName("message") val message: List, @SerializedName("status") val status: String )...

e: Supertypes of the following classes cannot be resolved. Please make sure you have the required dependencies in the classpath I am getting the following error when trying to run my project in android studio. Additionally it shows me the following Cannot access 'AppCompatActivity' which is a supertype of 'MyClass'. Check your module classpath for missing or conflicting dependencies. The project is working fine until I integrated firebase. At this time when removing dependencies from firebase the error keeps appearing. Gradle(App) apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply plugin:...

How do I get the listener from the MaterialButton.addOnCheckedChangeListener { "as a lambda" } I have some MaterialButtons which changes checked state (in a toggle group scenario). My plan is to listen to the Checked status through MaterialButtons addOnCheckedChangeListener but I need to remove the listener when some conditions occure, how do I get the listener (object) from the lambda (and put it in the onCheckedChangeListener value) ? var onCheckedChangeListener: MaterialButton.OnCheckedChangeListener?=null ... myMaterialButton?.addOnCheckedChangeListener { button,...

How to implement Interfaces from CompositePageTransformer class I just started studying Kotlin and tried to follow an example about CompositePageTransformer and ViewPager2 but in example use JAVA. I am so confused about it. The problem is I can't override fun transformPage on ViewPager2.PageTransformer My Kotlin Code val compositePageTransformer = CompositePageTransformer() compositePageTransformer.addTransformer(ViewPager2.PageTransformer { override fun transformPage(page: View,position: Float) { val r = 1 -...

Jetpack Compose + Firebase Crash java.lang.ArrayIndexOutOfBoundsException at androidx.compose.runtime.SlotTableKt.groupSize(SlotTable.kt:2558) I am working on an application using firbase firestore realtime database. The application once the user logs in for the first time will check if the user has a username. If not, it will display a popup to allow user name to change. User can also change the username via the drawer menu, which will also display the same popup. This what my viewmodel looks like: class MainViewModel : ViewModel() { private val _user = getInstance().currentUser private val _usernameChangeSuccess =...

Why can you not concatenate an empty string in Kotlin's print function? Why does println(something + " " + something) not work in Kotlin? I know println(something, something) does not work either. Surely there must be a way around this?

Join an array of CharSequence into a string I am a newbie in Kotlin, sorry for the silly question. Inside a bundle from a StatusBarNotification object I have found an array of CharSequence, or at least I think that the type is that one. In the image you can see a screenshot which shows the output that I get when I evaluate the variable from within a breakpoint (in Android Studio "Debug" window->Evaluate). I have tried accessing .javaClass.kotlin but I get an...

Running a Python script on cloud - communication with Android Application I'm making an a Android Application (Kotlin) for image processing (algorithm written in Python). My goal is -> In my Mobile App I take a picture. This picture is send to python script (running on cloud). Image processing algorythm is doing his job and gives output (String will be enough). This string is send back to my Android Application. I would like to run the python script in cloud (24/7). Is there a cloud / server where I can run python script and make connection beetwen Android...

Create custom Kotlin annotation based on other annotation I have a DTO, which is validated by Spring JSR validation, like this: data class CreateDeckRequest( @field:NotBlank(message = "should not be blank!") val name: String?, @field:NotBlank(message = "should not be blank!") val techDesc: String? ) I am trying to reduce boilerplate and want my DTO to look like this: data class CreateDeckRequest( @NotBlankApi val name: String?, @NotBlankApi val techDesc: String? ) To do that I want to create custom...

Get system permissions in Kotlin to get IMEI I am working on an old project who used to get IMEI through getDeviceId(), but now I am trying to update this app, but still gets an issue about permissions, this is the code: fun getImeiPreAndroid6(activity: Activity): String{ val imei: String imei= "" telephonyManager = activity.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { val imei: String = telephonyManager!!.getImei() } else { val...

Como puedo solucionar el error "Unsolved reference"? Unsolved reference Al ejecutar la app me da el error de unsolved erefernece, tanto en el LoginActivity como en el RegisterActivity. Lo único que hice fue cambiar el activity al que iban dirigidos posteriormente. Dejo el código del LoginActivity, aunque el error es exacatamente igual en el Register. No me deja poner el nuevo MainActivity, solo no me da error cuando pongo el anterior, pero claro, al eliminarlo no deja ejecutar. class LoginActivity : AppCompatActivity(), View.OnClickListener {...