Android Toolbar with activities and fragments So I have a grocery project to work on, and it is required that I have to have a toolbar all. Just a toolbar that includes the name of the current Activity/Fragment, and a back button. I searched on Stackoverflow, and all the answers were either 'use ViewPager' or 'use Tabs'. There was an answer here that was very close, but it was toolbar in multiple activities. (<a href="https://stackoverflow.com/questions/35942653/android-reusable-toolbar-for-navigation-where-to-put-code">Android,...

OkHttp Dispatcher Fatal Exception when force closing then reopening app When i first start my app, i am able to do everything that I need to do. However, when i force close then reopen my app, the app crashes with 2019-10-16 164840.237 6294-6360/com.[app_name] E/AndroidRuntime: FATAL EXCEPTION: OkHttp Dispatcher Process: com.[app_name], PID: 6294 java.lang.NullPointerException: throw with null exception at com.[app_name].c.a.h.a.a.a(Unknown Source:3) at com.[app_name].c.a.g.a.a(:34) at h.k0.e.g.a(:112) at...

Android mutableListof(pair(k,v) --&gt; pair value empty if i clear variable but i add mutableListof before clear()... why will be empty? i hope someone help me... So, i use it mutableListOf with pair() but i dont understand how and why work it. var x = mutableListOf() val y= ArrayList() val testNumber : Long = 5 y.add(testNumber ) x.add(Pair("testString",testNumber)) Log.i(TAG, "$x") //--> x = [testString,[5]] y.clear() Log.i(TAG, "$x") // --> x = [testString,[]] so my testNumber value is empty pls help me:)

Android Widget AlarmManager Repeating himself for every 5 sec - issue updating Kotlin I want to update my widget on certain time and then i will give new time after receiving old time. example : calling update at 11:30 and next update time i will set after 11:30 code is working but after 11:30 its keep calling onReceive Method every 5sec please note i am not using any repeat and cancelling AlarmManager , please note i am using Widget class. and i have removed android:updatePeriodMillis so there is no auto update internal fun updateAppWidget( context: Context,...

error: cannot find symbol variable FILENAME I Migrated to AndroidX. I added dependencies for espresso and JUnit, JuNitRunner. But Still I get the error for MainActivity.FILENAME private StoreRetrieveData getDataStorage() { Context context = getInstrumentation().getTargetContext(); return new StoreRetrieveData(context,MainActivity.FILENAME); } } MainActivity.FILENAME this gives an error as 'Can not Resolve Symbol FileName'

Using SQLDelight JVM Driver on Android Is it possible to use the SQLDelight JVM driver on a pure Java/Kotlin module which is later going to be consumed on an Android module? Just wondering because I like the idea of having the persistency layer of my app on its Domain module, which happens to be a pure Kotlin module with no dependency to the Android framework. Thanks

Kotlin coroutine suspend error with Room DataSource.Factory Overview Expected - Successfully making a Room query for a DataSource.Factory in order to populate a PagedList. Observed - The app fails to build. Error A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptExecution Implementation ViewModel class ContentViewModel : ViewModel() { fun processEvent(...) { ... viewModelScope.launch { _feedViewState.value = FeedViewState(contentList = getContentList(...)) } ......

How to send pings from client side to the server side on websockets ktor.io I tried to search in api docs as well as examples, but there weren't any example demonstrating how to send pings and receive pings. The only example was of how to connect to websocket and to send a text here. I also saw chat sample here of server side and i carefully followed that as well (i.e. set ping interval in server side...

Back Button on Camera Crashes I have been looking at various solutions on Stackoverflow but nothing seems to work. I am having a problem where when a user initiates a camera and then presses the "back" button to cancel out of the camera, the app crashes. I thought this piece of code below was what would solve the problem but doesn't seem to work. else if (resultCode== Activity.RESULT_CANCELED) { startActivity(Intent(this, MainActivity::class.java)) println("result cancelled") return...

React Native or Kotlin which is better for cross-platform development? I am a react native developer and I really like it for cross-platform development. but I recently heard that kotlin is the future of cross-platform development. I thought I would get better explanation of this in stackoverflow because I have not seen anyone in my circle using kotlin for ios development although I know the fact that kotlin is the first choice when it comes to native development but didn't about its ability of cross-platform development. So should I start learning it with the...

How to pass the events/values from alertdialog or popup window to an activity in Android MVP? I'm following the MVP pattern for my app and I am having confusion about adding the event listeners to the alert dialog and also passing the text view value from alert dialog to activity back. Which is the best approach?.

How to hide a view if scroll view is at top? How can I detect if a scroll view is scrolled to the top? I would like to hide a view if the scroll view is not scrolled to the top and show if it is. I am coding this in kotlin.

How to mock dependencies in Fragment Scenario during android testing (Kotlin) I am trying to test fragment independently. Right now, I am using fragment scenario as follows: @Test fun testChangeSubmitButton() { val scenario = launchFragmentInContainer() scenario.onFragment { sut -> val mock = Mock(sut.mandatoryCheck()) sut.aFunctionThatRequiresInput(mock) assert(...) } } is it possible to mock components, similar to val mock = Mock(sut.mandatoryCheck()) so that i can use it to test inside...

How to Generate PDF from JSONObject in Android? I have a JSONObject and I have to generate a PDF where the content will be pretty formatted raw JSON of that JSONObject. How can I generate it in Android Kotlin? I have found similar work in Github but it cannot compile successfully.

Start Button from Right to Left Instead of Left to Right I am trying to make it so that the Button in the Linear Layout starts from the right side and to set the Button 5dp from the right edge of the Linear Layout, with the TextView showing to the left of the button. Currently, it only allows to set the button from the "left" edge of the linear layout. I've tried all sorts of ways but nothing seems to work.

How to use Couchbase CAS with Kotlin I have a Kotlin data class for which I need to detect concurrent writes, for which I want to use the CAS value: https://docs.spring.io/spring-data/couchbase/docs/current/reference/html/#version My entity declares @Version private var version: Long? = null or @Version private var version: Long = 0 yet in any case an INSERT of a new entity results in...

Probability data structure The Idea is to have a data structure that you can access its elements only randomly, but based on a probability factor defined by the user for each element. So if the probability of the structure that contains 100 elements to yield x is 0.5, then, theoretically if we try to retrieve a random element a hundred times then x will be returned about \~50 times. I couldn't find a ready-solution that does this, so this is my take on it: import kotlin.math.absoluteValue /** *@author mhashim6 on...

Null safety error showing after checking for null I perform a function (listOf(matchUid, first_name, gender, matchBio, age).any { it == null }) that checks if any of the variables passed in are null: private fun getMatchData(doc: DocumentSnapshot){ val matchUid = if (isUser1) doc.getString("user2") else doc.getString("user1") val first_name = if (isUser1) doc.getString("user2name") else doc.getString("user1name") val gender = if (isUser1) doc.getString("user2gender") else doc.getString("gender") val matchBio = if (isUser1)...

Load more recyclerview Items on click of "more" button with url I am using retrofit to showing recyclerview items. At first only two of them is visible but on clicking of "show more" button, I am trying to load rest of the items with api. my approach is to add more items with a url but not able to figure out if i am going in a correct way or not. I am able to show starting 2 items and from back end , I am getting a url in "nextComments" tag. Passing this url as a parameter in api calling method. Trying to figure out the next approach...

JUnit 5 Annotations - Not Working with LiveData / Parameterized Tests Overview Expected Behavior Replace mock object initialization using the mockObject function implementation with annotation syntax initialization for JUnit 5 as outlined in the documentation and <a...

Is there a way to detect calls done by messaging apps like whatsapp on android? I am working on an application that should be triggered when a phone call ends. Currently, I am able to detect the normal phone calls using the PHONE_STATE intent-filter, but am not able to detect WhatsApp or other messaging apps calls. I have tried using the AudioManager Mode flag to detect the calls. The good news is that it does detect all messaging apps calls.... And also ghost events without any apparent reason. Many times I am "detecting" a "phone call" (due to changes in mode state of...

Video editor add text/sticker/filter android I have been doing for video editor project. Just to research about technical. I read about video trimmer in this link https://github.com/titansgroup/k4l-video-trimmer. So, I have already handle thumbnail bar and I want to add a text to screen of video corresponding with thumbnail position. I don't know how to do that. May be I use a surface contains video and draw text. Addition, how can i save new edited...

Limiting the maximum number of coroutines that can run in a scope I am translating our current application from Java to Kotlin and I came upon this problem. The java implementation used to use threads to transfer data from the server. It would create about 100 different threads that would request data, but from what I have seen no more than 4 would run at a time, the others would wait for a thread to finish before starting. When translating it to Kotlin I used Coroutines This creates a problem because apparently the server can't handle 100 requests...

Android registerOnSharedPreferenceChangelistener only triggered a few times after that not working Hello so I have the problem that I registered a onSharedPreferenceChangeListener in my MainActivity. The only preference I have is a ListPreference with 3 different options. So at the start of the programm it still gets triggered the first - 3 times mostly, sometimes it doesn't even trigger at the begining. I don't think that's how it is supposed to work so my code is down below if more is needed just write a comment of a specific part. (from MainActivity)...

Retrofit CallAdapter for suspending functions which returns for each List&lt;Object&gt; a List&lt;LinkedTreeMap&gt;. How to solve it? I was inspired by the writing of this adapter to Valery Katkov's answer answer My Retrofit call adapter is able to transform the JSON of normal objects correctly, but when I expect from a call a List, Retrofit returns me a List. It cannot parse Object within the list Exception java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to com.example.networkcalladapter.Post CallAdapter Factory And...

Unable to invoke no-args constructor I have the following retrofit singleton: interface MyAPI { @GET("/data.json") suspend fun fetchData() : Call companion object { private val BASE_URL = "http://10.0.2.2:8080/" fun create(): MyAPI { val gson = GsonBuilder() .setDateFormat("yyyy-MM-dd'T'HHmmssZ") .create() val retrofit = Retrofit.Builder() .addConverterFactory( GsonConverterFactory.create( gson ) )...

Android APIv29 FileNotFoundException EACCES (Permission denied) I'm not able to access storage when building for targetSdkVersion v29. Here is my gradle configuration: compileSdkVersion 29 buildToolsVersion "29.0.2" ... minSdkVersion 15 targetSdkVersion 29 NOTE that WRITE_EXTERNAL_STORAGE permission is granted and the same setup works fine when building for targetSdkVersion 28. Here is my implementation: val outputFolder = File(baseFolder + File.separator + "Output Folder") if (!outputFolder.exists()) {...

Error HTTP 504 When load image form URL with picasso android library I want to load image from URL with picasso android library and show it to view but I get an error only in android 7.0 Nougat. The URL of the image uses HTTPS. In my other project with the same image URL I didn't get the error if I run in real device 7.0 nougat, but it still error if I run in emulator 7.0 Nougat. I try to other URL image from different domain and I didn't get the error too. how do I fix it? Picasso.get().load("My_URL_Image") .resize(200,200)...

Get decimal/grouping separator from currency code I need to get the decimal and grouping/ thousands separator for a currency code I have. Like, for "USD" I need decimal separator as "." And thousands separator as "," Similarly, for "VND" I should get decimal separator as "," and thousands separator as "." We do have the DecimalFormatSymbols class which gives me the decimal and thousands separator, but that needs Locale as parameter for it's constructor but all I have is the currency code as a string value. Any suggestions appreciated!...

Python client doens't receive messages from Spring websocket server Goal of the project is, is to have a JVM (Kotlin) server and a Python client communicating with each other by a websocket. The server must send updates to the client and the client will process these updates. The server is a Spring Boot application, running the Spring Boot websocket server. The client is for now just a Python script, running websocket-client to connect to the server. What is working: List item the client can connect to the server the client can connect to a topic on the...