Android Lint missing self assigments within kotlin scope functions I've noticed a few scenarios where self assignment can occur without any lint warnings in Kotlin's scope functions (apply/run). Is there a lint check I'm missing that will catch these? I created very basic custom lint that catches these but I'm looking for something more targeted at the scope functions. This happens pretty often when a developer is assigning variables within a .apply{} in a similar fashion to what they're used to in a java constructor: val bar = "bar" ... foo.apply {...

org.mockito.exceptions.misusing.InvalidUseOfMatchersException in Android 10 I'm using mockito-core:3.1.0 with android 10 and have this code in my test val testView: ViewGroup = mock() whenever(testView.getChildAt(any())).thenReturn(topParentView) val mockActivity = mock(Activity::class.java, RETURNS_DEEP_STUBS) whenever(mockActivity.window.decorView.findViewById(any())).thenReturn(testView) doReturn(inputBitmap).whenever(screenShotUtil).takeScreenShot(any()) It works fine in android 9 or lower but in android 10 the test fails with the following exception:...

Kotlin SpringBoot and JPA - How to create relations OneToOne? I am trying to create a relation OneToOne between two entities and always get the error (or very similar, Error creating bean with name 'entityManagerFactory' always): org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: Unknown mappedBy...

Kotlin Firestore Queries Issue Im using FirestorePagingAdapter in the FireStoreUI framework to create a simple query and get results into a recycler view. I am able to fetch results and display them if I use a simple query: var mQuery = FirebaseFirestore.getInstance().collection("test") But in my application I have a searchView which I will be using to add queries options in mQuery eg: var mQuery : Query = FirebaseFirestore.getInstance().collection("test") if (!searchString.isNullOrEmpty()) {...

How to implement a timeout action due to inactivity Suppose I have an action to be executed after a certain amount of time without the user touching the screen. How can I implement a timer that executes an action when it times out, but starts over every time the user touches the screen?

Android Kotlin - socket.write or getOutputStream, flush closes connection Another day another head scratcher. Been trying to send ByteArray over TCP socket and get a response but when ever I write to socket in any shape or form it will not wait for response. I set up a Packet Sender app that waits for connection on port and when connection from android device occurs it should return some string. So far I have two pieces of code....first one send but does not receive, second one does not send any data but triggers the response... im baffled. My code is (sends...

Android Kotlin/ FirebaseDatabase.addListenerForSingleValueEvent Error.. plz help me I'm doing Modulization for my kotlin study team that don't know firebase usage. when i try to call the function(named getEyeSavingData) then occur something problem... plz help... location that calling function is A.kt isgTestButton.setOnClickListener { val database = FirebaseDatabase.getInstance() val eDB = database.getReference("eyesaving") //eDB.child("food").child("test").setValue(EyeSavingData("name", "element", "effect", 1234,...

ViewPager: onPageSelected not being call if user swipe below or equal 50% of a screen I have a Viewpager that show a list calendar of month and when I try to swipe each tab sometime it's hard to go to another tab like when user have to scroll to another page there is 2 possibility: User have to swipe fast so it will work fine If user scroll slowly, they have to move the page larger than 50% of the screen to move next or right In recycler view user don't need to swipe larger than 50% of the screen to move the page though

app crash when taking photo for the first time I'm new to android development. We use flutter to develop our app. and recently we found there is a bug. When we installed the app, and take photo for the first time the app will come in to crash. Here is the log W/libEGL (14538): EGLNativeWindowType 0x79dd857010 disconnect failed D/ViewRootImpl[MainActivity](14538): surface should not be released W/libEGL (14538): EGLNativeWindowType 0x79d7690010 disconnect failed E/ (14538): [ZeroHung]zrhung_get_config: Get config failed for...

Coroutine Continuation block internal working and how does suspend /resume of a coroutine different than threads suspend/resume I have been working with coroutines for few weeks and sometimes its tough to understand the real working difference between thread concurrency and coroutine concurrency. How suspend functions works internally ? How is continuation block helping in resuming the computation after suspension. How is sequential computation of the line of code inside coroutine not blocking the thread ? and how is it better than thread concurrency ?

Android kotlin: cannot find symbol class ListItemPopularVideoBindingImpl I am trying to use data bainding in my recyclerview adapter so after creating adapter and item list i created a textview extension in separate file like this: @BindingAdapter("videoTitle") fun TextView.setVideoTitle(item: MostviewedvideosEntity) { text = item.title } I added this extension to my recycler item. list_item_popular_video.xml: But when i add app:videoTitle="@{mostVideo}" into xml i got this error: error:...

how to fix repeating pictures in different items? I have a RecyclerView that defines a FlexBoxRecyclerView. My problem is that when I, for example, create the first item with one image, and also create item2 with the same image as in the first item ,only adding another different picture. Result first first item doubles or item2 repeats first item in images. Adapter class AdapterPostProfile : RecyclerView.Adapter() { private lateinit var mAdapter:...

Get every Post from Firebase in ArrayList I'm using Android Studio, Kotlin and Firebase for my Project. My problem is I cannot display the posts from firebase. In the debugging mode I can see that I receive them, but they are not showing in the emulator. I cannot find where my mistake is. Thanks in advance. This is my Homefragment: private var postsAdapter: PostsAdapter ?= null private var postsList: MutableList ?= null override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?,...

Android and Windows Bluetooth Communication in Kotlin As a preface, I have minimal experience in writing Android apps and absolutely none in working with Bluetooth, but let's just get into it. I am attempting to build an Android app that sends data to a PC (Windows only at the moment). I have gotten the Android app to a point where is states it is connected to the bluetooth server running on the Windows PC and it is sending data it's way. The problem is, the server running on Windows never gets past the point where it says "Server Started....

Coroutine Channel in Extension Class does not send or receive data I have been working with kotlin and coroutines lately and I am trying to implement a channel in an extension class of a Fragment Class. To explain myself better: MapFragment.kt --> Fragment Class which calls functions sendFunction() and receiveFunction() when a button is clicked. MapFunctionality.kt --> Extends the MapFragment class. Here are both functions sendFunction() and receiveFunction() implemented. MapFragment.kt open class MapFragment : Fragment(), PermissionsListener,...

How to avoid Type expected error while using WHEN? I am trying to code a type converter between an Int and Priority. It is a Room database. class PriorityConverter { companion object { @TypeConverter @JvmStatic fun intToPriority(number: Int?): Priority? = when (number) { is 1 -> Priority.Low is 2 -> Priority.Medium is 3 -> Priority.High else...

Best way to share data among two fragments implementing a map view? Newbie to Android and I have some questions about fragments/livedata/viewmodels. My app (that deals with allowing users to create local tours) currently has a bottom navigation bar and each tab brings you to a new activity, the starting fragment being the home fragment. In that fragment, it has half a google map view that zooms in on the current location of the user, and half a list view where it will list tours in the area. I also have a search fragment, where I want a map in the background...

How do I format a byte array to be sent to a characteristic on a BLE device? I connect to my device and attempt to write to its characteristic: scanSubscription = rxBleClient.scanBleDevices( ScanSettings.Builder() // .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY) // change if needed // .setCallbackType(ScanSettings.CALLBACK_TYPE_ALL_MATCHES) // change if needed .build() // add filters if needed ) .filter { scanResult -> scanResult.bleDevice.name == "MyDevice" } // Filter for devices named MyDevice .subscribe({ scanResult -> // Print list of...

Count rows Android Room on Kotlin learning Kotlin, proper app structure and stuff... Again... :) So i have the following: Dao Repository ViewModel Dao Code @Dao interface ItemDao { @Query("SELECT * from item_table ORDER BY Name ASC") fun getSortedItems(): LiveData @Insert(onConflict = OnConflictStrategy.IGNORE) suspend fun insert(item: Item) @Query("DELETE FROM item_table") suspend fun deleteAll() } Repository class ItemRepository (private val itemDao: ItemDao) { val allItems:...

Android MVVM clean architecture with livedata I have an architectural question. Currently my app is so simple that user logs in and gets a list of restaurants and he can logout. I use kotlin coroutines for async part, mvvm live data and koin DI. Here is my login flow when user clicks on login. The regex validation is done in LoginViewModel - LoginFragment -> LoginViewModel -> AccountUseCase -> AccountRepoImpl -> AccountLocalDataSource or AccountRemoteDataSource And the response is given all the way back from DataSource to...

retrofit + rxjava when using concatWith the second request is not being sent I have to methods that make a request to a server, the first returns Completable and the second one returns Single with a result. I want to start them simultaneously and be notified when both completed, I tried to use concatWith but what I see that only the first request is sent, the second one is not being sent even if the gateway2.doRequest2() is called (I see it in the debugger, as the result doFinally and subscribe are never invoked. Both requests work when called separately...

Why isn't @DisplayName working for me in JUnit 5? For some reason, I'm really having a hard time getting display names to actually be respected in JUnit 5 with Kotlin. Here's a test file I created for the purpose of example: import org.assertj.core.api.Assertions import org.junit.jupiter.api.DisplayName import org.junit.jupiter.api.Test @DisplayName("Example Test") class ExampleTest { @Test @DisplayName("test name") fun myTest() { Assertions.assertThat(false).isTrue() } } But instead of these names being used,...

Communication between Fragment and DialogFragment in Kotlin I have been doing communication between a DialogFragment and Fragment completely wrong, through an activity that implements the interface, then tells the fragment what to do. This just seems like a waste of space and full of potential errors, so I've been working on doing the communication directly to the fragment. I have been trying to figure out the best way to do this. I have found 3 ways, but I'm not sure which would be best to implement, most particularly when I only have 1 function I...

Volley JsonObjectRequest PUT not getting a response (Kotlin) I am having trouble getting a response from an HTTP request using Volley from Kotlin, on an Android 8 emulator. I have tested the generated request via cURL (copy and pasted from the debugger) and it works as expected. Code below. appCtx is the Application Context, from the 'splitties' library. // Instantiate the RequestQueue. val queue = Volley.newRequestQueue(appCtx)...

My JsonArrayRequest gets an error when getting the response from the array in my web server this is my code to display categories on a list view from mysqli database......................................................................................................................................................................................................................................................................................... package com.example.foodapp import android.content.Context import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import...

Maven Version Range in Build Section I'm working on a Spring app using Kotlin. When applying the spring plugin I noticed some odd behavior. When I use a specific version, i.e. 1.3.60, it works just fine, but when I try to apply a range, i.e. [1.3.60,1.4.0), it says the plugin is applied, but my @Service classes are all still marked as final. Why is that? working pom.xml: ... 1.3.60 ... org.jetbrains.kotlin kotlin-maven-plugin 1.3.60 org.jetbrains.kotlin kotlin-maven-allopen...

Android Kotlin New intent on click event from recycler view I've just started learning android development with Kotlin. I have a recycler view that lists items. I'm trying to create onClick event for the item and then start a new intent and pass along the item id. I'm getting an error when trying to instantiate the Intent "None of the following functions can be called with the arguments supplied". I think it's because I cannot access the context of the view? override fun onBindViewHolder(holder: ViewHolder, position: Int) { holder.id =...

Is there any limit for multiple writes to the Cloud Firestore? I make new documents multiple times without checking the success of the write: for element in data { val document = firestore.collection("test") document.set(element) } Sometimes data contains hundreds of elements and I have discovered that in some rare cases not every document is uploaded to the cloud (e.g. 5% are not successfully uploaded, but only the last elements). Is there any limit for multiple writes? Should I wrap it into the batch?

Edit livedata from non UI thread in kotlin I am designing a application with a bluetooth connection for displaying some data that is received from the BT. I want to use androids LiveData for communicating between layouts and classes. I have a dedicated (non UI) thread for managing the connection with the bluetooth adapter that is responsible for receiving and sending data. I now have a problem because I cannot edit the LiveData from that thread. I have the following code for editing LiveData: class ConnectThread(device:...

Kotlin Anko - I'm Getting a Future<ArrayList<String>> instead of an ArrayList<String> from doAsyncResult I'm trying to get an ArrayList from a doAsyncResult in Kotlin and I keep getting a Future> I read about Future in the Kotlin documentation, but I don't understand what about my code makes it return a Future instead of a regular ArrayList. I'm using Anko just to be clear. fun getMealById(mealId: String): ArrayList { var resultAL = doAsyncResult { var jsonO = JSONObject(URL("https://www.themealdb.com/api/json/v1/1/lookup.php?i=" +...