Access and Delete a row in one query in SQLite I am using Room Database to make a database to store information in a table. I want to access one entry from the table and delete the same entry without the need to call two functions. @Query("SELECT * FROM history_packet_table ORDER BY timestamp ASC LIMIT 1") fun get() @Query("DELETE FROM history_packet_table ORDER BY timestamp ASC LIMIT 1") fun delete() I want these two operations to happen only by calling get. Is there a way?

How to store the token retrieved from another system in Spring application? I'm retrieving token from another system using credentials provided by customer. After the token is retrieved I'm creating a UsernamePasswordAuthenticationToken and put it into SecurityContextHolder. I would like to store the token as well because I'll need it to perform the API calls. Where do I put the token? I don't like the idea of putting the token to the password property of the UsernamePasswordAuthenticationToken. You can find the code below: override fun...

Does the Echo Show run android apps? I have an android app that is a slideshow of images and it runs primarily on Samsung tablets but can run on pretty much any android device. I want to be able to run this 'slideshow' app on alexa shows? Is this possible. Ive been googling around and cannot find the answer anywhere. My code is obviously written in android studio in Kotlin, how would I go about using this code with Alexa Shows?\ Thanks!

error: annotations are not supported in -source 1.3 (use -source 5 or higher to enable annotations) I'm new to android and I build my first test project in android studio but get this error Java compiler error: annotations are not supported in -source 1.3 (use -source 5 or higher to enable annotations) how should i fix it? And this is my gradle // Top-level build file where you can add configuration options common to all sub-projects/modules. buildscript { ext.kotlin_version = '1.3.50'...

Update glide sliderview visible items when sort a recycler view I have an activity with a recycler view. In my adapter, each item has some informations and a slider view thanks to Glide Slider (https://github.com/firdausmaulan/GlideSlider). When I sort the list, all items are updated with the right informations, but the images remain in the same place for the first two items visible on the screen. When I scroll the page, the photos match the right items. How to update...

Application isn't reading files So I have used this code before and it worked just fine, but the app I developed then used the library "printooth" made by mazenrashed, I was then asked to do it without using the library. On my tests without using it I successfully used the bluetooth, but then when I started trying to read files (which I thought would be the easy part since I didn't use the library for that so it should be a matter of adapting the code) the app simply wouldn't read them. Am I forgetting to do something?...

Download file from server Retrofit2 I have successfully download data from server. Now I want to open in pdf, how should I write? GlobalScope.launch(Dispatchers.Main) { val downloadService = RetrofitFactory.makeRetrofitService() val call = downloadService.generatePdf("http://admin.myproperty.tech/v1_front_api/download_vacant_possession_pdf?auth_token=" + MySharedPreference?.getUser()?.auth_token + "&" + "vacant_possession_id=" +...

How to load video from JSON into Webview (with Iframe) using Kotlin I am currently making some apps where I have to use JSON files and Recyclerviews. The problem for me at the moment is that I can't seem to find a solution on the internet for loading a video in webview. Searched the internet for too many hours already. class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) mainRecyclerView.layoutManager =...

update UI on new API data from Observable I'm too newbie to handle this by myself. I have a method where some API data is stored in an Observable and I'm trying to fire this event every 60 seconds. I'm doing this because I want to provide the recyclerView with actual data. If new data has arrived from the API, the recyclewView should refresh. This is the method where I get the data from the API: fun getHead(status : String , wenr : Long, test : Boolean) { view.onShowDialog("") val headResponseObservable:...

java.text.ParseException: Unparseable date: "10/10/19 10:02" in android I am having issue in parsing the date format. It's fine with english language devices but it creates issues on other language devices. Below are the code: Activity class: try { callDayTime = Utils.DATE_FORMAT1.parse(callDate) time = Utils.DATE_FORMAT.format(callDayTime) }catch (e: Exception){ Applog.e("MainAct", e) } Utils class: var DATE_FORMAT = SimpleDateFormat("dd/MM/yyyy HHmmss", Locale.getDefault()) var DATE_FORMAT1 = SimpleDateFormat("dd/MM/yy HH:mm",...

How to schedule repeating task in kotlin? I want to call some api in the background every X minutes and then process the json file I get I've lokked into this documentation: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.concurrent/java.util.-timer/schedule.html I'm new to kotlin (I used java before) and I have no idea how to use those functions, any examples of usage would be helpful. Right...

Room database class initialization val db = Room.databaseBuilder( applicationContext, AppDatabase::class.java, "database-name" ).build() Is it compulsory to create instance of database class using the aboove code in mainactivity? in android ROOM?

How to set character whitelist in Firebase Vision Text Recognizer I'm using Firebase Vision Text Recognizer (On Device Text Recognizer) and I want to limit characters to numbers only. I can do this in tesseract like this: tesseract.setVariable(TessBaseAPI.VAR_CHAR_WHITELIST, "0123456789"); I know that I can filter the output but in my case, it doesn't help. I want to know is there any way to do the same thing in FirebaseVision? Thanks.

Not calling OnScrollListener.onScrolled() while scrolling programmatically Is there any way to call RecyclerView's methods scrollToPosition() or smoothScrollToPosition() without triggering (set before) OnScrollListener.onScrolled()?

Download webpage to android app from web server I'm hosting a web page on a device who has a web server. Right now i'm creating an app which will connect to the device through WiFi direct. Once its connected I want to download, or show, the webpage on the android app. What is the best way of doing this? I looked into dart and flutter plugin I think it will do the job but i'm not really familiar with android and web server development, so I'm not sure. It is possible that I'm looking at this from the wrong way. Thanks for the help!

"Its dependency 'kotlinx-coroutines-core' was not found" Coroutines do not work in KotlinJS, reports that kotlinx-coroutines-core was not found, although even it is implemented and kotlinx-coroutines-core-js is also implemented. About 3 days I can not find a solution to this problem. I need your help, community! SCREENS: Tree of project: Main.kt: <a href="" rel="nofollow...

Kotlin-Native cinterop Updating a Struc field from C I am using kotlin-native and have to pass a pointer to a struc to a C function. My "Kotlin Stub" has the signature of fun SET_SM_REFS_INDEX(index: Int, thisObject: CValuesRef?). On the native side the code wants to hold a pointer to 'thisObject' and wants to update a field in the structure possibly in another thread. Lets call that field an integer "thisObject->myUpdate" for example. Right now I try to create an object using var AA = cValue and try to call the function as...

How to write array list of strings in Firestore . Android I need to write a simple collections where documents only contains an array list of strings. usersBlocked -blockerID - usersBlockedList -userID1 -.... -userIDN At this moment I'm able to update the list if the document already exist in this way: (for testing porpouses I wrote it by hand). val reference = Firebase.firestore .collection("usersBlocked") .document(userIDBlocker) reference.update("usersBlocked",...

Using parent instance in child class I'm not sure what this pattern is called, but I wanted to understand if that is considered a good/bad practice. So, I've Base.class that creates a Children.class instance. Now, in Children class I've an async callbacks A, B, C. I've to react on these async callbacks - but all methods that I need to call on these callbacks are in Base.class as it works as main controller and messages other submodule about new changes. Very often the simple solution here is to create Callbacks A1, B1, C1 in...

Type converter in room android class CrimeTypeConverters { @TypeConverter fun fromDate(date: Date?): Long? { return date?.time } @TypeConverter fun toDate(millisSinceEpoch: Long?): Date? { return millisSinceEpoch?.let { Date(it) } } @TypeConverter fun toUUID(uuid: String?): UUID? { return UUID.fromString(uuid) } @TypeConverter fun fromUUID(uuid: UUID?): String? { return uuid?.toString() } } I am learning android room and got stuck in this part. Can anyone explain about these function. How...

How to relaunch cancelled Job? I want to use coroutines instead of handlers. I have call which will refresh data every few seconds. It is called in Job object. When I leave app to background, I want to cancel this Job and refresh. When I come back to app I want to relaunch this job to do its work. But once I cancel job, it will not relaunch ever again. Is there any way how to relaunch cancelled job? Because isActive == false even when I reinitialize variable job = launch { while (isActive){ delay(5000)...

Why is the navigation triggered within the Fragments? I'm trying to setup my project according to the MVVM pattern and I'm using Android Architecture Components by Jetpack. I have an "splash" fragment, during which an HTTP request is made and depending on the response, the user will be navigated to ether the settings view or the main view. FragmentSplash: class FragmentSplash : Fragment() { private lateinit var viewModelSplash: ViewModelSplash override fun onCreateView( inflater: LayoutInflater,...

Can't convert List of List&lt;Object&gt; (Room Database) I have inserted ArrayList to Room Database. Now I want to get ArrayList from there. But my TypeConverter doesn't work. Here is my TypeConverter object ConvertersList { @TypeConverter fun fromString(value: String): ArrayList { val listType = object : TypeToken() { }.type return Gson().fromJson(value, listType) } @TypeConverter fun fromArrayLisr(list: ArrayList): String { val gson = Gson() return gson.toJson(list) } } Here is...

Cannot get real-time updates with Cloud Firestore I am trying to get realtime updates with Cloud Firestore. While reading and writing are successful, I cannot get any update notification with the following code in Kotlin: val collectionName = "users" val docId = "alovelace" val docRef = db.collection(collectionName).document(docId) docRef.addSnapshotListener({ doc, e -> System.out.println("Updated") if (doc != null) { if (doc.exists()) { System.out.println("Current data: " + doc.getData())...

Can't initialise Visualizer on Android using Kotlin I am currently having trouble while trying to display a "blast" view from the media playing, using this library: https://github.com/gauravk95/audio-visualizer-android I am working in an activity coded using Kotlin I did as advised in the readme, but am having an issue when my activity starts: E/AudioEffect: set(): AudioFlinger could not create effect e46b26a0-dddd-11db-8afd-0002a5d5c51b / `�?�v,...

is there a way to make a function to not return null when lookup from a map Having a Map, and need to look up by key and pass the result to a SDK's api which takes only on-null value. like: fun doSomeThing(value: V) The look up could be as val v = theMap[key] but the v is nullable now, even if the key used here is guaranteed to exist and the v will be not null. is there a way to make function not return nullable in case need to look up from a map? fun returnNotNullable(key: K): V { check(keyExist()) return theMap[key]!! // dont like the !! here }...

Kotlin - Coroutines not behaving as expected This question is linked to one of my previous questions: Kotlin - Coroutines with loops. So, this is my current implementation: fun propagate() = runBlocking { logger.info("Propagating objectives...") val variablesWithSetObjectives: List = variables.filter { it.variable.objective != Objective.NONE } variablesWithSetObjectives.forEach { variableWithSetObjective ->...

ONVIF : Can we connect to NVR just same as ONVIF IP Camera in Android? I have successfully connected my android device with IP Camera through ONVIF with IP of particular camera, How can i list out all the cameras that connected to a single NVR? I want to make an application like https://play.google.com/store/apps/details?id=com.mcu.iVMS&hl=en.

How can I use xml values inside a String I need to scan a qr code with an Android device. The result that is given to me comes inside a variable of type string. The text format is xml. And I need to extract the values from there. How can I do it? The programming language I´m using is Kotlin. I need the value in matricula. Here is an example of the xml text inside the string: <A nome="Matricula">data</A> data1 data2 data3 data4

Type converter in Room Ok this will be too beginners question but still. Suppose I have created a Converters.kt class as class Converters { @TypeConverter fun fromTimestamp(value: Long?): Date? { return value?.let { Date(it) } } @TypeConverter fun dateToTimestamp(date: Date?): Long? { return date?.time?.toLong() } } And also added @TypeConverters(Converters::class) in my database class. Now what next. How to access dateToTimestamp and fromTimestamp in my codes. Some demo app will be helpful