Handle orientation change for multiple fragments in an activity I have an activity which has a container for fragments. I have three fragments in that particular activity. When I rotate the screen it comes to first fragment. How can I make it show the second fragment if it was the current screen. I tried to add this method Handle Fragment On Screen Orientation Changes?. But I am having error: java.lang.IllegalStateException: Fragment VerifyOtp{d123b5f}...

best implementation of splash screen android my last question was terrible, so i'm going to ask a better one giving more information . Looking online i've found more than one way to implement a splash screen on android apps. Someone create a new "splashActivity" with a "splash.xml" layout and a "splash_theme" ( often fullscreen) , some others use a "splashActivity" with no "splash.xml" layout, but just a theme with a "splashscreenDrawable.xml" as background. I'm using the last one because it seems more fast compared to the first case...

Questions regarding BLE advertise and broadcast What I have read from many documents of Android Developer and lectures that I searched on the internet is: Advertising is sending signals to a broadcasting device so that the device could be found and Broadcasting is scanning the advertising devices to connect/send data. Is what I understood correct? Then is it true that BluetoothLeAdvertiser should be implemented first before scanning activity? I am keep researching on the internet to find information in order to create an app that can...

I get a "Val cannot be reasigned error" even though I assigned the variable as var? I'm trying to add "copy to clipboard" functionality to an application. I added a setOnClickListener on the image button for copying and wrote the code below. I still get "val cannot be reassigned" error on "clipBoard.primaryClip = clip" line var clipBoard: ClipboardManager = getActivity()?.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager val StrEdtFirtname = etNoteDesc.text.toString() val clip = ClipData.newPlainText("Copied...

How to check which is the source image of a button and change it every time the button is clicked in Kotlin What I am trying to do is, change the source image every time I hit the button. Suppose if the source image now is 'a' and when I press the button I want this to be 'b' and when I press it again I want it to be changed back to 'a' again. I have this code to change the image once, but I am not able to check the current source image and hence I am not able to change it back to the previous one. Note: I am using FloatingActionButton override fun onCreateView( inflater:...

Difference between ActivityViewModels and lazy ViewModelProvider? Difference between ActivityViewModels and lazy ViewModelProvider? I've seen 2 ways to initialize a viewmodel: private val someViewModel: SomeViewModel by activityViewModels() private val someOtherViewModel: SomeOtherViewModel by lazy { ViewModelProvider(this).get(SomeOtherViewModel::class.java) } I know lazy initializes the ViewModel only when it's needed and that activityViewModels is useful for sharing data between fragments, but other than that what's the difference? Android...

Developing a JPA Entity which takes a oneToMany relationship and converts the value to a count of columns matching a value My goal with one of my projects was to take one of my entities, list all occurrences of action, and provide stats for those actions in the user's profile. To do this I want to have the database update the user's profile based on the actions taken by that user. @Entity @Table(name = "action") class ActionEntity( @Id @GeneratedValue val id: Long? = null, val userId: Long? = null, val result: Int? = null //the result of the action ) The above would be a...

How do i create and fill a file in the directory the User choose with ACTION_OPEN_DOCUMENT_TREE on Android 9-11 I try to make an Export Function for my App, that can export(and later Import) data to a txt-file in the shared storage. I use the ACTION_OPEN_DOCUMENT_TREE to choose a Folder and get "resultdata: Intent?" back. For explanation in the Downloads-folder/Documents-Folder there is a "myApp"-folder. The user gave permission for that folder. So i get an Intent? with the path to this place back How can i use that to create a "Spells.txt" in said folder without ACTION_CREATE_DOCUMENT

Kotlin Creating List<List<Map<String, String>>> I am trying to return List from a function in kotlin. I'm new to kotlin. Here's how I am attempting to to this val a = listOf(listOf(mapOf())) The problem with the above variable is, I am unable to figure out how to insert data into this variable. I tried with this: val a = listOf(listOf(mapOf())) val b = listOf(mapOf()) val c = mapOf("a" to "b") Then tried to insert this data: b.add(c) a.add(b) But it does not work. Can someone tell me how I can insert data into it? The end goal I am...

Dismiss Bottom Sheet Dialog and open a new dialog I Have an app login which is using Bottom sheet dialog for new user registration. I'm implementing a verify user email before login system. I'd like to open a dialog after completing a registration. Basically I'm inflating bottom sheet dialog from LoginActivity, but I can't seem to find solution for how to inflate another dialog to inform the user she/he has to verify email before login. Structure of login. LoginActivity -> BottomSheetDialog for registration --> after dismissing...

how check which mode enable day or night in android programmatically I have search online but can't find any helping material. So, I want to know that how can we check either user has enable night mode on their phone programmatically.

Using "this" to get class instance within companion scope in kotlin Hi i was trying to access the parent class instance from its companion scope in (android studio) Kotlin, like class A{ companion object{ val class_instance = this@A } } but it doesn't work, and it does outside the scope of Companion. is there any way to get it done, if not why? thanks in advance.

I'm Building Quiz Appliction with Kotlin ,I want to store data on server because . What will be the recommendation for Backend ? which is free ** My UI is ready , Now I want to upload my quiz related data on server like Firestore. But it is paid i think . What is recommendation ? **

arrayOfNulls of Uris I have declared an arrayOfNulls of Uris, the problem is that when I go through it, and apply an if condition to discard the null values, it is still printing them. Example: Suppose that the declared 4-position array has two positions with Uri, and the other two positions are null private val arrayUris = arrayOfNulls(4) private fun setImageViewWith(numberImageView: Int, data: Intent) { imageUri = data.data arrayUris[numberImageView]=imageUri...

Android handler java to kotlin I am trying the control of admob in libgdx. I found some good codes but when I try translate the java codes to kotlin codes I am always getting error. Can you help me please. private final int SHOW_ADS = 1; private final int HIDE_ADS = 0; protected AdView adView; Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { switch(msg.what){ case SHOW_ADS: adView.setVisibility(View.VISIBLE);...

How can I do this in Kotlin? I need help for a Kotlin app In a Java program I wrote, I can do this: public class GameAdapter extends RecyclerView.Adapter { private final List cards; private final Context context; private final View.OnClickListener cardOnClickListener; public GameAdapter(List cards, Context context, View.OnClickListener cardOnClickListener) { this.cards = cards; this.context = context; this.cardOnClickListener = cardOnClickListener; } And then instantiate the adapter like this: gameAdapter =...

I dont know why am I getting java.lang.reflect.InvocationTargetException with ktor So, I want to make multipart/formdata request to my flask server from android client via ktor. I followed tutorial from here, but does it any sense, when it doesnt work. I'm kinda frustrated and i need help. buttonSendHttp.setOnClickListener(){ runBlocking(Dispatchers.IO) { sendPic(spiner.selectedItemPosition) } } suspend fun sendPic(mode: Int){ val client = HttpClient(CIO)...

KOTLIN: My data do not gets from firebase realtime database I am trying to get data from my firebase realtime database. In my database there is a table whose name is "groups" and it has 3 values "datetime", "title", "username". I want to get title value and add my list. I am new in mobile programming. So, I appreaciate that if you help me. Here is my code val list: ArrayList = arrayListOf() database = FirebaseDatabase.getInstance() databaseReference = database?.getReference("groups")!!.child("title") val postListener =...

Handle @NotBlank errors - Spring Boot I'm trying to handle exceptions thrown through the by the @NotBlank annotation in a Spring Boot application. The code I have so far handles the MethodArgumentNotValidException thrown by @Size and @Email annotations. However when I expect a @NotBlank message to be returned, I instead get an empty response body, indicating to me that a different type of exception is being thrown, but it's not clear to me which one: See the model being validated: import javax.validation.constraints.Email import...

Error in include-dynamic with change dark theme in android I am using dynamic navigation between features, everything is between fragments, but when I change the theme it does not respond and it freezes This is my nav_auth_graph is a menu option. This is my feature authenntification the logic is that depending on the type of user I return to a view, either on the main page, or on their profile. But when I add the...

Kotlin native; compilation failed: cannot run msys2-mingw-w64-x86_64-clang-llvm-lld-compiler_rt-8.0.1/bin/clang++ I use Windows 7 and followed Get started with Kotlin/Native using the command-line compiler, downloaded kotlin-native-windows-1.5.10.zip and added its bin to the PATH of system. But when I try kotlinc-native hello.kt -o hello, get this error: error:...

Akka Persistence and optimistic locking I'm a newbie with Akka framework and actors design pattern and I would like to implement a kind of optimistic locking with REST endpoints. My problem is as below: Whenever a user edit a form, the state of the form has to be locked to readonly for other users and some informations saved for audit purpose (username, IP address, lock datetime...). If someone can give me some examples or some guidance in Kotlin or Java it would be useful ?

Problems with Compose BasicTextField: Now I have a custom Compose input box. BasicTextField, but I can’t center the input font anyway. I can only offset in the x direction through the offset property of the Box. The reason for customizing the input box is because I need a fixed height input box and font size. But the text field cannot be input when the height is not enough. Please help me, I prefer to use TextField to write input boxes with a fixed height. But no suitable solution was found on the site. Here is my custom code:...

Kotlin, Okhttpclient - ENOENT (No such file or directory) i am very new on kotlin, now trying to upload an image to the server by okhttp. fun assignUserAvatar(file : File){ val sharedPreferences: SharedPreferences = this.getSharedPreferences(sharedPrefFile,Context.MODE_PRIVATE) val tempToken = sharedPreferences.getString("TOKEN","defaultName") println(file.toURI()) return if(tempToken != ""){ val url = "someURL" val body = MultipartBody.Builder()...

Suspending until StateFlow reaches one of the desired states and returning the result Consider a sealed class State. sealed class State { object Unknown : State() object Loading : State() object Success : State() data class Failure(val exception: Exception) } I have a stateflow where consumers can actively listen to the state updates. val state:State = MutableStateFlow(State.Unknown) Now, I also want to have a simple suspend method which waits till the state reaches either Success or Failure, so consumers who just need the result once need not be aware of the...

Unable to fetch deleted contacts from ContactsContract.Contacts.CONTENT_URI I am trying to fetch deleted contacts from android contacts table. After searching many so links,best way to fetch the deleted contacts is by using ContactsContract.DeletedContacts I am able to fetch the deleted contacts from DeletedContacts table. val deletedContactsProjection = arrayOf(ContactsContract.DeletedContacts.CONTACT_ID,ContactsContract.DeletedContacts.CONTACT_DELETED_TIMESTAMP) val contactLastDeletedTimeStamp =...

Can't set text on text view in dialog fragment I have a dialog fragment and I use databinding to bind views. I can't set text on a text view after the dialog is created. Here is my code : class MyDialogFragment : DialogFragment() { private lateinit var layout : FragmentMyDialogBinding override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View { layout = FragmentMyDialogBinding.inflate(inflater,container,false) return layout.root } override fun onCreateDialog(savedInstanceState:...

Kotlin : why my forEach / for loop stops during first iteration just after variable affectation I am trying to update booleans defined as class variables in a forEach loop but the program exits the loop during the first iteration just after the variable affectation. private var prod1Allowed = false private var prod2Allowed = false override fun onCreate(savedInstanceState: Bundle?) { //... startConnection() //... } // Manages connection to Google Billing API fun startConnection(){ billingClient().queryPurchasesAsync( BillingClient.SkuType.INAPP...

Will jetpack compose change xml completely? I am currently learning android, is it better to learn jetpack compose more or xml version more? what does jetpack replace or change from xml version? (res files, activity, fragment, view model and so on) is jetpack only applicable on new android OS versions?

How to get to make a minimal http request? button click----> .... val asd=URL("https://example.com").readText() qwe1.text=asd crash app....how to get to make a minimal http request in kotlin?