Kotlin // Solve the example in a line How to solve an example in a string? Let's say we have val example : String = "3+5" So how do I solve this example? Or if val example : String = "3*5/3"

Make (0,0) correspond to bottom left of canvas? canvas.drawText(0,0) draws text starting from the top left. How do I make it draw to the bottom left of canvas instead? The closest working code I found is below from this answer but it draws the text upside down... canvas.translate(0,canvas.getHeight()); // reset where 0,0 is located canvas.scale(1,-1); // invert

i am trying to do multiple edittext addtextchangedlistener but app crashes I have 2 edittexts in my application. When I start to write a value in any of these 2 edittexes, I want to see the result in the other. But when I start typing value in any edittex I get an error private fun initListener() { var money = 0.0 binding.apply { monayValueEditText1.addTextChangedListener { val money1position = moneyValueSpinner1.selectedItemPosition val money2position = moneyValueSpinner2.selectedItemPosition...

Unable to import Gson in gradle file i´m trying without success to import this "import com.google.gson.Gson" in one gradle file i´ve created just to manage some tasks. The funny thing is i´m able to import this Gson in other parts of the app, is only here where i´m having issues. In my gradle.app i have I also tried this answer Importing GSON using gradle, but when I...

Location Change listener continuing to broadcast events after being removed Ive implemented this interface class LocationListener(eventManager: RoadSnappedLocationProviderEventManager): RoadSnappedLocationProvider.LocationListener { var eventMananagerRef: RoadSnappedLocationProviderEventManager? = null init{ eventMananagerRef = eventManager; } override fun onLocationChanged(p0: Location?) { Log.d("TZ", ("TZZZ $p0.toString()")) val params: WritableMap = Arguments.createMap() params.putString("message", p0.toString())...

How to add OnBackPressed() to privacy policy in kotlin? The webView and onBackPressed() are working fine but when using it for privacy policy it closes the app as there is no backstack of webview i want to come to my last page in the app from where i jumped to webView How to do that.` MainActivity.kt override fun onBackPressed() { var webView= findViewById(R.id.webView) if (webView.canGoBack()){ webView.goBack()} else{ finish() } }

Koin library is not compile in Multiplatform project I want to use koin library for DI in the Multiplatform project but I get some errors when I want to build the project. How can I fix them? My Libraries: object Koin { private const val version = "3.2.2" private const val koin_android_compose_version= "3.2.1" private const val koin_android_version= "3.2.2" const val koinCore = "io.insert-koinkoin core${version}" const val koinTest = "io.insert-koinkoin test${version}" const val koinAndroid =...

My custom button for my Android Application isnt working I am trying to get a custom button for my Android App. The problem is, that the colours/gradiant arent applied to the button background, but the Radius is. Can anyone tell me why? button_pressed.xml: button_disabled.xml and button_default.xml are the same Custom_button.xml: activity_main.xml:

RoomDB crashes when migrating - Android I was trying to migrate existing room database to a newer version but got really weird error, which never happened to me before. Application crashes when opened, instantly. In logcat, I get following error from room: java.lang.RuntimeException: Exception while computing database live data. at androidx.room.Room TrackingLiveData.refreshRunnableSlamb da-0(RoomTrackingLiveData.kt:74) at androidx.room.RoomTrackingLiveData. $r8slambdaSUkyPj-RMUOTXOMbUuy5NWSwMoOE(Unknown...

Show and hide image when a Radiobutton is selected in either of the two radiogroups I am trying to make two vertical columns of radiogroups. And that both work as a single radiogroup , so when an option of a radiogroup is selected, the other options disappear My problem occurs when I try to select a RadioButton and try to display an image and likewise when I select another, the image of the Radiobutton that was selected is shown and the others are hidden I hope and someone can help me. Thank you very much. class MainActivity : AppCompatActivity() { private lateinit var...

private val viewModel by lazy { ViewModelProviders.of(activity!!).get(TaskTimerViewModel::class.java) } deprecated, almost there OK so I was doing a tutorial and it had private val viewModel by lazy { ViewModelProviders.of(activity!!).get(TaskTimerViewModel::class.java) } and I think the solution is private val viewModel by lazy { ViewModelProvider(this)[TaskTimerViewModel::class.java] } And this seems correct but if I replace this with activity!! in the second code fragment, it does not work. I am fairly sure I need to use activity!! as I am sharing the ViewModel between 2 fragments. Maybe ime doing it...

Jetpack Compose - LazyColumn fails to show some items if I swipe fast I just try scrolling a list with LazyColumn. Problem is, if i scroll fast, it doesn't work laggy but it skips some of items. It can show all items when i scroll the screen slowly. compose_ui_version = '1.2.1' kotlinCompilerExtensionVersion '1.1.1' Here is my code : @Composable fun ListItemRowCompose(listItem : RegularListItem) { Card() { Row( modifier = Modifier .padding(10.dp) ) {...

How to set a sequence of colors for list of cards - Jetpack Compose - Kotlin Instead of a random color, how can I sequence through the list of colors so that the color of the canvas cards are always in order? val colorList: List = listOf(RedOrange, RedPink, BabyBlue, Violet, LightGreen) val randomColor = colorList.random() Canvas( modifier = Modifier .matchParentSize() .padding(10.dp) .clickable { expanded = !expanded } ) { drawRoundRect( color = randomColor, size = size,...

Keyboard on view event is not working by Kotlin Coding is easy for Keyboard event handling by Kotlin if write the following code override fun onKeyUp(keyCode: Int, event: KeyEvent): Boolean { return when (keyCode) { KeyEvent.KEYCODE_ENTER -> { .... true } else -> super.onKeyUp(keyCode, event) } } } But this event is working for real keyboard device not virtual keyboard on view Let me know fix way someone....

How to make bottom sheet with logo? How to make bottom sheet with logo, when the bottom sheet is up then the size of logo will change to big and when the bottom sheet is down the logo will change into a small size?

how to unit test data class function in kotlin I'm kinda block with my 1 test case, suppose I have this generic function that will observe if in the field of form will validate: fun MutableLiveData.validateField(scope: CoroutineScope) = this.asFlow() .map { this.value.isNullOrEmpty() }.stateIn( scope = scope, started = SharingStarted.WhileSubscribed(), initialValue = false ) and I have this data class that some fields are the same validation so I need to do this to avoid boilerplate. data class...

Action for distinct markers I want to differentiate the markers I have on Google Maps for different actions on each. I have 3 tags: Bus stop Collaborator User When I try to place a click action on one of them, for example on the bus stop marker "code below", the action goes to all other markers. Would you be able to differentiate each of them? private fun setBusStopMarker() { if (::mMap.isInitialized) { stopLocation.forEach { stopLocation -> val markerBus = mMap.addMarker(...

Programmatically take screenshot Android 13 I have the following code, which works perfectly fine on Android 12 and below, but for a weird reason, Android 13 takes "black" screenshots, about 95% of the time. fun setVirtualDisplay() { mImageReader = ImageReader.newInstance( deviceScreenUtils.getWidth(), deviceScreenUtils.getHeight(), PixelFormat.RGBA_8888, 2 ) mImageReader?.let { val flags = DisplayManager.VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY or...

Getting very small PCM file from AudioRecord I am trying to write the audio signal recorded on the phone microphone to PCM file, using Android AudioRecord class. The PCM files I am getting are too small and when I convert them to WAV there is only the click sound(10-20ms). The filesize is roughly couple KB for minute. Please help! Changing the buffer size is not helping. val SAMPLE_RATE = 44100 val AUDIO_SOURCE = MediaRecorder.AudioSource.MIC val CHANNEL_CONFIG = AudioFormat.CHANNEL_IN_STEREO val AUDIO_FORMAT =...

Setting opaque background color on Jetpack Compose Button causes non-uniform coloring (inner rectangle) I've been having this issue where I need to set an opaque color for the background of a Button in Jetpack Compose. This is the code which I'm dumbed down and tested with: #33FFFFFF Button( onClick = { }, shape = RoundedCornerShape(8.dp), colors = ButtonDefaults.buttonColors( backgroundColor = colorResource(R.color.opaque_button_background) ), ) { Text( text = "Hello" ) } This is what it produces: <a...

CameraX medium-quality image is smaller than the low-quality image Background I’m using cameraX for capturing image and video and I have 3 buttons using which users can select different qualities (low/medium/high) for image and video. On selecting each quality value, I initialise the camera again by setting the selected quality for the image and video capture use cases. Problem When I select low quality(setJpegValue(50)), my file size is 200Kb however with medium quality(setJpegQuality(70)) file size is 180Kb. On further debugging, I noticed that if I do not...

Method calling kotlin I'm sure there is already an answer for this, but I'm very new and a lot of the answers I found look overly complicated and well past my experience as a programmer. I created a class with a method, I wish to call on that method to display after it promts the user for input. I know where to call on the method. But don't know how to in kotlin. PLEASE HELP! Here's my code fun main() { println("Enter degrees in Fahrenheit") } class ComputeMethods(){ fun tempConversion(degreesF: Double){...

How to change according to the switch value when outputting the notification contents in Kotlin I am developing an app that outputs the notification content to the user by voice when a notification comes. The user sets detailed settings through the switch and wants to change the audio output according to this value. For example, if the use switch is off, voice output is not possible, and if the user name display switch is turned off, only the contents of the notification are output. To implement this function, I used sharedPreference and changed the sharedPreference value whenever a...

Check whether list of items inserted succesfully or not in room table Dao : @Insert(onConflict = OnConflictStrategy.REPLACE) suspend fun insertProducts(dataUser: List) i am inserting list of products in the table at a single time ...i know whether the all data inserted successfully or not i tried all the ways like return type of Long ( but it is working only for inserting single item ) Also please tell me the viewmodel code ..that how could i receive the success value or failure value..so that i can process the next step easily

App crashes and implementing picture in picture mode to timer When I tried to emmulate the app that I coded in the connected phone, it keeps closing due to crashes, is there any problem in my code? Also, I am trying to make a timer app with picture and picture mode. I followed the tutorials and try to to combine these: <a href="" rel="nofollow...

When i get 10 data next 10 data is downloading but the previous 10 data is disappear how can i fix?(I think something wrong with arraylist) OnCreate............................................................................................................................................................................................................................................................................................................................. auth= FirebaseAuth.getInstance() //binding.idRLWallpapers.adapter= ImageAdp(arrayList) adapters= ImageAdp(arrayList) binding.idRLWallpapers.adapter=adapters...

Can't Pass Bundle argument from Fragment to Viewmodel SavedStateHandle I am learning mvvm. I want to pass frgment bundle argument in ViewModel savedstatehandle .I am using Hilt-Dagger. Please help me. Everytime savedstatehandle is null. here is my code. FIRST FRAGMENT: @AndroidEntryPoint class CustomerOrderSubmit : Fragment() { private lateinit var binding: FragmentCustomerOrderSubmitBinding val customerViewModel: CustomerViewModel by viewModels() override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?,...

How to show JSON data into RecyclerView using adapter in Kotlin? I have succeeded pulling JSON from Reddit API but I cannot put it into my RecyclerView. I set a Log to check if my JSON is empty or null, and the Log successfully print the desired output, so that means my JSON is not empty and contains the necessary data. Here is my HomeFragment.kt override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) Log.d(javaClass.simpleName, "onViewCreated") val rv =...

How to use nav arg to move to next fragment? This is my main activity of my app. I'm using nav controller. class MainActivity : AppCompatActivity() { lateinit var viewModel: NewsViewModel lateinit var navController: NavController override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val newRepository = NewsRepository(ArticleDatabase(this)) val viewModelProviderFactory = NewsViewModelProviderFactory(newRepository)...

'public' class exposes its 'public/*package*/' superType xxxClass In Java, here is the code abstract class A { Code code; // constructor A (Code code) { ... } } In kotlin, I wanna inherit it class B(code: Code): A(code) { ... } And the compiler give me this error: 'public' class exposes its 'public/*package*/' superType xxxClass Can anybody help me find out why this happen?