Data from database always return Empty Array use Room Library I want ask about my code. Error not show when I'm insert data to database, but when I try to getAll I just got empty array. I don't know where the wrong. I hope someone can give me solusion about this problem this first time I use Room. this my interface for Dao: @Dao interface SampleDao { @Query("SELECT * from Sample") fun getAll():Single @Insert fun insertSampel(sample:Sample) this my singletonDB: @Database (entities = [Sample::class], version = 1) abstract class SingletonDB :...

kotlin-room figure out how to save this field I upload information to the Book class. tableName = "Books_name" data class Books( // @Embedded // val additional_imgs: MutableList, val adult: Int, val author: String, val bookmark: Int, val chapters: MutableList? = null, val chapters_total: Int, // @Embedded // val comments: MutableList, autoGenerate = true val id: Int? = null, val img: String, val lang: String, val last_activity: Int, val n_chapters: Int, val publisher: String, val rating: String, val s_title: String,...

Is checked exception behaviour still appropriate in view of Kotlin? The default behaviour of @Transactional methods that throw checked exceptions is well documented and widely discussed, and generally makes sense to me. However, with increased use of Kotlin I think there is increased danger of fairly catastrophic problems creeping into code unawares, and I'm wondering if there should be any consideration of changing the behaviour of DefaultTransactionAttribute to be in line with the behaviour of TransactionTemplate, which does rollback on checked...

Unable to load vector tiles from local tileserver php instance into android mapbox sdk I have a deployed the tileserver php in my local machine and i am trying to load tiles from that server using the android mapbox sdk. Lets say that the ip of my machine is 192.168.1.9. I assumed that i could use the json response from http://localhost/tileserver/tileserver.php?/india.json as the json style with...

How can I fix these errors to upload some files into server related with kotlin suspend function? I had several issues to upload my images to server. Then I used kotlin suspend function to implement pipeline. But I met server error following. This is my code. fun Route.customerUploadImage() { logger.info { "Receiveing Image request" }; post("/me/image") { logger.info { "Receiveing Image POST request" }; call.customerService.saveProfileImage(call.receiveMultipart(), loggedUser().userId!!)...

kotlin vs python speed I was trying out Kotlin today and ran their hello world example from the official docs $ time java -jar hello.jar Hello, World! real 0m0.141s user 0m0.096s sys 0m0.052s I tried a python equaivalent like so: $ time python3 -c "print('Hello World!')" Hello World! real 0m0.053s user 0m0.044s sys 0m0.008s I was xpecting Kotlin to be significantly faster - the numbers suggest it is...

Fragments overlap the fragment in TabLayout I have a TabLayout with two fragments the two of them shows a RecyclerView (one movies and the other tv shows). The TabLayout works perfectly but the problem comes when I click in the image of a film. The click in a movie should make a transaction to the movie details fragment. But when this happens the ListFragment with the TabLayout appears under the new one so the two of them are displayed. My ActivityMain, code where I call the transaction and where I set the Page Adapter: override fun...

Kotlin - Type conversion with overflow exceptions (123L).toInt() produces 123 but Long.MAX_VALUE.toInt() produces -1. Clearly this is not correct. Without having to write a lot of boilerplate code, is there a way to get Kotlin to throw an exception when a value is out of range/bounds for the target type?

How to create map with generics in Kotlin? I need to have Map where keys are classes, and values are objects of appropriate classes. Like mapOf( Int::class to 10, String::class to "Ten" ) I whant to use generics to avoid 'invalid' entries, like Int::class to "Ten" How can I implement it?

How to refer an Kotlin object type in Java? I have the Kotlin object as below: object TestObject { val name: String = "Hi" } How would refer to TestObject in Java? The code below doesn't understand TestObject.name: public class Main { public static void main(String[] args) { System.out.println(TestObject.name); } }

Kotlin - How to turn back volume changing? I'm trying to set set const volume with AudioManager by changing it every time. Here is my code: private val broadcastReceiver = object : BroadcastReceiver() { override fun onReceive(context: Context, intent: Intent) { if ("android.media.VOLUME_CHANGED_ACTION" == intent.action) { audioManager.setStreamVolume(AudioManager.STREAM_RING, constDeviceVolume, 0) } } } The problem is in that it line...

Uploading an Image and Firebase says "User does not have permission to access this object", even when storage settings are public I'm trying to upload an image, then have the download location of said image stored in a val. Yesterday it was working 100% perfectly with no issue. I changed no code and I cant upload the image now, now it says Failed to Upload Image User does not have permission to access this object. I checked every single stack-overflow/Reddit post with the same topic, and they all say to change permissions of my rules to public. My rules are set to public service firebase.storage { match...

ViewPager Fragments are not initialized immediately I have a ViewPager with an adapter of FragmentStatePagerAdapter. For the sake of simplicity I have 2 Fragments within my ViewPager. class MyPagerAdapter(fragmentManager: FragmentManager): FragmentStatePagerAdapter(fragmentManager) { var firstFragment: SampleFragment? = null var secondFragment: SampleFragment? = null override fun getItem(position: Int): Fragment { return when(position) { 0 -> SampleFragment() .also { firstFragment = it }...

Does this ifs statments decrease performance? So, I'm modularizing my app with architecture, now, in my view I'm getting fullName, password 1 (pw1) , password2 (pw2) and email. I have a button action that call signUp() method signup override fun signUp() { val fullName:String = etxt_name.text.trim().toString() val email:String = etxt_email.text.trim().toString() val pw1:String = etxt_pw1.text.trim().toString() val pw2:String = etxt_pw2.text.trim().toString() if(presenter.isEmailValid(email)){...

How create a interface in activity with kotlin How can i create a interface in the activity for implement the method in a fragment. all in Kotlin I'm triying with next code but no work. that was a copy and paste but from java. private var callback: interfaceDelegate? = null override fun onAttachFragment(fragment: Fragment) { super.onAttachFragment(fragment) if (fragment is interfaceDelegate) { callback = fragment as? interfaceDelegate } }

How to implement SelectionTracker in Java not Kotlin On Android, I want to users to be able to select multiple rows from a list. I read that I can use SelectionTracker with a RecyclerView to enable list-item selection. But all the code examples are in Kotlin. Are there any examples of SelectionTracker in Java?

itext pdf one table depends on data multiple table create in android Json Data display itxet pdf in table. All JSON data display one table below code but how to Create tables depends JSON Key "PartyName" value change tables are create? I am using retrofit2 and rxjava2 to parse the JSON data. I have to separated data show in table. "PartyName" is the JSON key. The "PartyName" value same its display one table when "PartyName" is change its object data display in another table . PartyName value change its created new table display data. How to its more...

How to click button or view behind another activity in android There is second activity behind the first activity surrounding RelativeLayout in android But the button in activity behind it doesn't press. How can I click?

How to fix The specified child already has a parent error in Android In my application i want use BottomNavigationView and i want set badge on one of items! I write below codes, but after run application show me Force Close error. My Activity codes: private fun badgeBottomNavBar(count: Int) { val bottomNavigationMenuView = bottomNavigationView.getChildAt(0) as BottomNavigationMenuView val v = bottomNavigationMenuView.getChildAt(3) val itemView = v as BottomNavigationItemView val view =...

How to efficiently parse couchbase document to custom java/kotlin types on android? I have some synced document from Sync gateway on local couchbase lite db. I need to parse this json document to my custom java type. But couchbase return me Map. I just want to know is there any way from which I could store Custom type in couchbase db while syncing from sync gateway. Currently I am converting Map to Custom java type everytime I open the app. But this process takes some time and its affect my UI loading time.

How to retrieve current position(latitude & longitude) on Kotlin? I want to retrieve the current position of my phone on Kotlin. This is my main code (taken from https://androidteachers.com/kotlin-for-android/get-location-in-android-with-kotlin): package com.anta40.app.locationtest; import android.Manifest import android.content.Context import android.content.DialogInterface import android.content.Intent import...

How to fix <merge /> can be used only with a valid ViewGroup in Android In my application i want use BottomNavigationView and i want set badge on one of items! I write below codes, but after run application show me Force Close error. Activity codes: fun setInboxIcon(count: Int) { val bottomNavigationMenuView = bottomNavigationView.getChildAt(0) as BottomNavigationMenuView val bottomNavigationItemView = bottomNavigationMenuView.getChildAt(3) as BottomNavigationItemView val badge = LayoutInflater.from(this).inflate(R.layout.notification_test,...

How to Use typing time for entering dates in TimePickerDialog Currently, the way dates are entered using Android's analog picker as the default picker with the keyboard as an additional option. How can I reversed it, where the keyboard is the default option and the analog is the additional one. What I want in this image https://ibb.co/4J5XWTW

Is there any one help for custom tab layout with animation.I tried with various ways but its fail How to implement custom tab in android with animation For reference I found this IOS library,How to create custom tablayout in android same like above library.

Hibernate annotation scanning not working under Gradle 5.4 I'm busy converting a maven build into a Gradle build, i got everything running, except that i now see this error whenever i try to run an hql query via Hibernate for alles entities that i try to query (running via Maven still works, the pom file is still in the project): org.hibernate.hql.internal.ast.QuerySyntaxException: Account is not mapped [SELECT o FROM Account AS o WHERE lower(o.email)=:email] I have the following dependencies under Maven: ......

Map in generated companion object ignores modification I am building a simple login view for an app. All authentication is handled via a generated SwaggerAPI from our endpoint. Username and password are to be encoded as Base64 and added into a Map of in order for the API to use its job. I do that the following way: private val apiHeaders: Map = HashMap(ApiClient.defaultHeaders) // Clone original Headers @Throws(io.swagger.client.infrastructure.ClientException::class) override fun login(base64EncodedLogin: String) {...

Recycler view is not update when using carrousel manager library I'm trying to pull image data into Recycler view (each sub item is a PagerSnapHelper element) but faced below problem 1 - recycler view is not getting update when first time load, sub elements seems to be misalignment. 2 - i have to slide or touch the screen to reload the view, all elements is showing ok then. <a href=""...

setupNotification returns "Error already connected" whereas no connection request is send I'm making an Android application with some BLE interraction using the RxAndroidBLE API. I followd examples guidelines and samples from https://github.com/Polidea/RxAndroidBle I establish a BLE connection with a specified device, later while connected I read and write characteristic with no problem, but when i try to setup notification for the battery level characteristic I get the following throwable error...

Unable to build android studio project with Kotlin compiler while creating composite primary key in room version 1.1.1 While I am creating an 'Entity' with a 'primaryKey' annotation over a field to create any SQLite table using room, the Android Studio project builds successfully. But while I am trying to create an 'Entity' with composite primary key, unable to build the project. Unfortunately as I am using 'Dagger 2' in my project unable to see the actual build error. Note: Project complies with Kotlin compiler. Code: @Entity(tableName = "thread_users", primaryKeys = {"thread_id", "user_id"}) public class...

How to set Map&lt;String, KClass&lt;out Any&gt;&gt; as property type? How can I generate below line of code using Kotlinpoet? val myMap:Map I initialize myMap in init block.