How to navigate to custom preference with navController? 1) I am using Android Jetpack 2) I am trying to navigate to my custom preference TimePreference (extends DialogPreference) from my SettingsFragment (extends PreferenceFragmentCompat) with findNavController().navigate() function but I am keep getting: "java.lang.IllegalStateException: Target fragment must implement TargetFragment interface" even if I implement TargetFragment interface to my TimePreferenceDialogFragmentCompat (extends PreferenceDialogFragmentCompat) which is necessary for...

Expandable List View : how to set Group (Parent) height Does anyone know how to set the group height of ExpandableListView, for example 1/6 the height of the ExpandableListView container?

How to implement by viewModels? I have been trying to implement the LiveData and View Model. In this App, a number is displayed on the screen and we can add five or minus one. Now Earlier I used viewModelProvider but now it is deprecated and I am using "by viewmodels" but it is showing ann error fragOne.kt override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { // Inflate the layout for this fragment var binding =...

RxJava dispose Observable in subscribe Are there any clear and smart solution to dispose observable from its subscribe method? E.g. I have an Observable.interval that emits Long every second. In my subscribe method i want to check if 20 seconds gone than dismiss subscription. val observable = Observable.interval(1000,TimeUnit.MILLISECONDS) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe( { num -> if(num == 20.toLong())...

SQLDelight - Emit on Parent Tables when Child Tables are Modified I haven't come across an obvious way to emit notifications on parent tables when child tables are updated with SQLDelight. Here is an E/R Diagram roughly outlining the structure I have in play: Which translates roughly to the following database schema: R(ID) S(ID, parentId) T(S_ID, attribute) And these .sq files: -- com/package/R.sq CREATE TABLE R ( ID Text PRIMARY KEY ); -- com/package/S.sq CREATE TABLE...

Number counter changes quantities on +/- press in kotlin I would like to know if there's a dependency as as the following picture below : the remove icon in the left side, the quantity in the center and the add icon in the right, a number counter changes quantities on +/- press Or, should I create it by my self ?

How to write this java code without java.util.stream library on kotlin? var validPushes: MutableList = IntStream.range(0, pushQuantity).mapToObj { inx -> readPush()} .filter { push -> processor.validatePush(push, state)} .collect(Collectors.toList()); How to write this java code without java.util.stream library? I could not find an analog to mapToObj. map does not fit, because I need to cast it to Obj. Collectros replaced by asSequense

Kotlin load html from internal storage to webview i would like to load an html page from my internal storage into a webview but i couldn't find any exemple on how to do it. Here is what i can do : webView.loadUrl("file:///android_asset/article_0028_0071.html") This work but i had to manually add the page to asset. Then i got the same file in internal storage the full path is : /data/user/0/com.example.app/files/articles/article_0028_0071.html So i have tried : path = /data/user/0/com.example.app/files/articles/article_0028_0071.html...

Inform UI recyclerview item on audio play I have an application that some items are audioclips. When i press on one of them the audio clip plays. However i want to show something like an animation to show which item is currently playing. Here is the code. private fun setUpAudioReceived(holder: ReceivedAudio, chatMessageItem: ChatMessageItem?) { chatMessageItem?.let { messageItem -> messageItem.firstName?.let { holder.rcvAudName.text = "${messageItem.firstName} ${messageItem.lastName}"...

Parcelable Creator Syntax Can someone please elaborate on the syntax for Parcelable CREATOR here. for instance it's a static final property, but then I see a class like constructor for a Generic parameter, but no definition of class anywhere, please explain. public static final Creator CREATOR = new Creator() { @Override public Foo createFromParcel(Parcel in) { return new Foo(in); } @Override public Foo[] newArray(int size) { return new Foo[size]; } };

How to declare static interface methods in Kotlin? It is not possible to declare static methods for interfaces. For example, this is illegal: interface Foo { companion object { fun foo() } } (@JvmStatic is also illegal) How to (idomatically?) workaround the problem of declaring static methods in Kotlin?

Scrolling Tabs inside fragment I have a simple query. I have a TabLayout with 7 Tabs, in one of those Tab, I have a map inside. When I interact with that map, and move inside from left to right, it changes to another fragment (tab). Is there any way to disable the scroll option within the layout?

My layout's markup moves off using ScrollView with ImageView and TextView i am a new user in android dev. Actually i have one problem that i can't solve for much time. I have a layout with Scroll View, there are ImageView and TextView in this ScrollView. You can see it in my code: I take the data from json and using this layout for input it in. There are images that have different forms. So, please, help me with it. What i must to do with layout markup and what scaleType i must to use. Thanks in...

Deal with dynamic response in retrofit I'm receiving json like this { "animal" : { "type" : "FIRE", "food" : "potato", "water": "7up" } } --- { "animal" : { "type" : "WATER", "water": "7up" } } --- { "animal" : { "type" : "CYPO", "counter": 7 } } --- { "animal" : { "type" : "UNKNOWN", "food": "Stup", "water": "Cola", "counter" : 4 } } Am I suposed to create 4 data classes? I mean, I know how they are going to look, they are not going to change, but depends of the...

How to read a text file which contain multiple json data and which divide by the unice separator. in android kotlin * My the target work is the read the text file line by line using readline() function and then when came to the separator then send 1st JSON to the JSON parser... 1st I will share text file screen short : - This screen short, you will see the red mark which is the used separator. but my problem is that when I read the text file from the assets folder and read it line by line using a...

How to stop activity to run when in another activity I am currently working on an Quiz app in android studio with kotlin. I am fetching questions from an API. When I have reached the amount of questions that I set I will send some intents then start a new activity like this: private fun sendThemeAndDifficultyAndScoreAndToken(score: Int, theme: Int, difficulty: String) { val intent = Intent(this, ShowScoreActivity::class.java) intent.putExtra("score", score) intent.putExtra("theme", theme) intent.putExtra("difficulty",...

Hibernate Metamodel annotation processor doesn't recognize Kotlin entity classes I have some entity classes in Java and some in Kotlin. I just added the following to my pom.xml: org.hibernate hibernate-jpamodelgen ${hibernate.version} IntelliJ now shows metamodel classes for the java entities, but not the kotlin ones. So I added kapt to no effect: org.jetbrains.kotlin kotlin-maven-plugin ${kotlin.version} compile compile compile...

Limit access to multiple keycloak clients. per configuration or token I have two clients lets say ClientA and ClientB, and one user called userA both clients are access type confidential, and I followed this example to write my services https://sandor-nemeth.github.io/java/spring/2017/06/15/spring-boot-with-keycloak.html and everything is working, I have one problem though if I request an access token using this,postman request...

Error on build project MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26) I have an issue with building the project, and asked to upgrade the minSdkVersion to 26, has anyone any ideas about this type of issue? I am trying to resolve it and keep the same value for minSdkVersion = 19 Caused by: org.gradle.workers.internal.DefaultWorkerExecutor$WorkExecutionException: A failure occurred while executing com.android.build.gradle.internal.transforms.DexArchiveBuilderTransform$DexConversionWorkAction Caused by: org.gradle.tooling.BuildException: Failed to process...

Hibernate @Where not working with @NamedEntityGraph I am trying to use the @Where hibernate annotation on a unidirectional @ManyToMany association while using a @NamedEntityGraph on the parent entity (see code below): NOTE: I've renamed my entities to Parent and Child for example sake. Also, I am using Kotlin which shouldn't make a difference other than syntax. Entity Class @Entity @Table(name = "Parent") @NamedEntityGraph( name = "parent", attributeNodes = [ NamedAttributeNode(value = "children") ]...

what is problem of bad request when using volley? This is my function for the register to the server via API var url1 = "http://bookshop.ebda3soft.net/api/Account/Register" val stringRequest: StringRequest = object : StringRequest( Method.POST, url1, Response.Listener { response -> Toast.makeText(this, response, Toast.LENGTH_LONG).show() Log.d("aaa",response.toString()) try { val jsonObject = JSONArray(response) Log.d("san",jsonObject.toString()+"ddd")...

How to create a button of whatssap to send a message to a specific contact in my android app? [enter code here][1]Here's my code of calling my website to webview: class MainActivity : AppCompatActivity() { var website = "https://serrajimmobilier.ma/" override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) supportRequestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main) webView.loadUrl(website) webView.settings.javaScriptEnabled = true;...

Navigate to a Website using the Jetpack Navigation in Menu Drawer I am currently using the Jetpack Navigation, but I can't figure how to navigate to a website URI for example www.google.com on clicking the Calificar item in the menu. //Toolbar for the Drawer val toolbar: Toolbar = findViewById(R.id.toolbar) setSupportActionBar(toolbar) //Drawer Layout val drawerLayout: DrawerLayout = findViewById(R.id.drawer_layout) //Controller for the Navigation...

Android Room RxJava: Receive Updates for deleted Row I have a query with my room database: @Query("SELECT * FROM $TABLE WHERE $ID = :id") fun getStuff(id: String): Flowable I populate my screen with the results of that query by keeping a connection open with that Flowable, for the id associated with that screen. This works nicely because I automatically get DB updates. There exists a user flow in my app, where the row with id can be removed from my database while I'm still on the screen for id. How can I get the Flowable from getStuff to...

Problem with LiveData response from retrofit request Can someone explain me why my MutableLiveData is always "null" ? In another project I didnt this same like here and it working. Maybe I'm blind or something and I cannot see easy errors or something. class HomeViewModel : ViewModel() { val mutableLiveData = MutableLiveData() fun setString(word: String) { mutableLiveData.value = word } fun getString(): LiveData { return mutableLiveData } } class HomeFragment : Fragment() { lateinit var...

Data binding with Bottom sheet in android with kotlin How to use data binding with bottom sheet dialog in kotlin.I am facing problem to use data-binding with bottom sheet dialog

how to start ML Kit Face Detection in real time, when face is located in desired frame I need face detection but not on full screen, of the camera preview, just in my dedicated frame, something like MSQRD app. When the center of this frame / image in the camera view aligns with the detected face, the frame disappears.

CameraX change from alpha-04 to beta-01 broke the code I have added CameraX to my ongoing development app a while ago. I know it was in alpha but I was ready to make the change when beta or final release will be available. So I started working on it today. I have updated from implementation 'androidx.cameracamera core1.0.0-alpha04' implementation 'androidx.cameracamera camera21.0.0-alpha04' to this: implementation 'androidx.cameracamera core1.0.0-beta01' implementation 'androidx.cameracamera camera21.0.0-beta01' implementation...

Android keep button or view in front of all activities within the app without using baseActivity After a lot of time spent I can't find the solution. I want a button or any clickable view should stay visible for all activities and it should be only for one specific app not like chat heads. I am basically making a library so that's why I can't use base activity.I have attached the image as well for a better explanation. How can I achieve this any suggestions? thankyou... I

android studio: trust anchor for certification path not found My android app is trying to access some data from my asp.net core app with the url - https://192.168.1.112:5566. However, when I run the app I get an error "java.security.cert.CertPathValidatorException". Here is my getdata function: fun getData() { val retrofitClient = NetworkUtils .getRetrofitInstance("https://192.168.1.112:5566/api/") val endpoint = retrofitClient.create(Endpoint::class.java)...