How to set color icons , texts header bar in Android Studio Kotlin/ Java? Im trying to set the text and icons colors from header bar( i don't know the name of it exactly) when user click in a square button on menu. Follow the image below i was trying to set there by style like this @color/colorOrange @color/colorOrangeDark @color/colorWhite @color/colorWhite @color/colorWhite but im stuck. How can i do that ?

How to use putextra () in Kotin I want to send data (number) from "edit text section" of Sub-Activity1 (users input a simple number)and receive in another Sub-activity2, and depending on the number I want to show different sets of text. I am a beginner and I am stuck where in Sub-Activity 2 as it returns error for "val str" where I want to receive and manipulate the number received from Sub-Activity 1 "editText". Sub-Activity 1 : getResult.setOnClickListener { val intent = Intent(this, subactivity::class.java)...

AutoCompleteTextView not working properly for a substring in Android AutoCompleteTextView not working properly for a substring in Android I have an AutoCompleteTextView like this in xml file ..... I am then configuring it like this inside BottomSheetDialog adapterFrom = ArrayAdapter(this, R.layout.spinner_single, symbols) (dialog.etACSymbol as? AutoCompleteTextView)?.setAdapter(adapterFrom) (dialog.etACSymbol as? AutoCompleteTextView)?.setOnItemClickListener { adapterView, view, position, l ->...

kotlin inline function only have a return statement I want to use inline function return outside function(skip print the "after") So when i use inline fun test() { return } fun test1() { println("before") test() println("after") } test1() the output is before after When i use inline fun test(callBack: () -> Unit) { callBack() } fun test1() { println("before") test { return } println("after") } test1() the output is before So i want to know why the return statement in the first inline...

How to run a new activity by clicking on menu item in android?[Kotlin only] [duplicate] I have a main activity along with second activity named AboutActivity.kt. In main activity there is a menu item named "About". I would like to run my second activity i.e. AboutActivity on cliking the menu item. So how do I achieve this? I would like to get only Kotlin specific answer preferably. Here is my code till now. MainActivity.kt class MainActivity : AppCompatActivity() { var currentImageUrl: String? = null override fun onCreate(savedInstanceState: Bundle?) {...

Unable to get response from server using Retrofit2 + Rxjava2 + Kotlin I am using Rxjava2 and Retrofit2 in my app I am using OpenWeatherMap apis to get weather details of particular location.But I am unable to fetch response from the server. Below is my code: Climate.kt data class Climate( @SerializedName("lat") val lat: Any? = null, @SerializedName("lon") val lon: Any? = null, @SerializedName("timezone") val timezone: Int? = null, @SerializedName("timezone_offset") val timezoneOffset: String? = null, @SerializedName("current") val current: Current? =...

RecyclerView load after doing action and not as the fragment loads Hey guys ive been searching in google for sometime now for solution to my problem but i cant find any. My recycler view getItemCount returns 0 and only after i switch between few fragments and get back to the fragment i use the recylerview in the adapter loads and return the real item number. i did put logger inside my getList function and even tho the items does pushed inside my array the command array.size return 0... i really cant find solution here.. this is some code to work with BTW ->...

Coil - Get Bitmap from URL ErrorResult I'm trying to convert image from URL to Bitmap using image loading library Coil. However my app crashes everytime, I don't know what I'm getting ErrorResult everytime. Here's the code: Fragment class MyFragment : Fragment() { override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { // Inflate the layout for this fragment val view = inflater.inflate(R.layout.fragment_my, container, false)...

Kotlin JsonObjectRequest to API for Mysql response not working So I've been working on other parts on my App for a while and this request was working fine, now for some reason it does not and I didn't do anything. private fun addfriend() { val url = "https://####/###?contacts=addfriend" var sp: SharedPreferences? sp = getSharedPreferences("login", Context.MODE_PRIVATE) val params = HashMap() params["id"] = sp.getString("id","1") params["code"] = friendcodeinput.text.toString() val jsonObject =...

command kotlinc error "kotlinc OpenJDK 64-Bit Server VM warning: Options -Xverify:" I wanted to set up a Kotlin development environment, but for some reason I can't. When I enter the following command, I get an error for some reason. How can I solve it? /src/main/kotlin$ kotlinc OpenJDK 64-Bit Server VM warning: Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release. Welcome to Kotlin version 1.4.10 (JRE 14.0.1+7-Ubuntu-1ubuntu1) Type :help for help, :quit for quit

>> 1 + 2

res0: kotlin.Int = 3 My environment is...

Google map is not working properly in android App I want to use google maps in my android app.I created a android app and select google map activity.Then I paste my Api key in the .xml file.The activity code given below. class maps : AppCompatActivity(), OnMapReadyCallback { private lateinit var mMap: GoogleMap override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_maps)...

How to implement CardView in Android (Kotlin)? the idea is to create cardview with only one card visible at time and I got difficulties in implementing cardview in Main.kt file. I took the sampleCode from CardStackView https://github.com/yuyakaido/CardStackView/tree/master/sample and tried to make it work for CardView because I need only one card instead of a stack. But the card should be swipeable as the one from CardStackView. Therefore...

How can I get up and running with apollo/graphql in kotlin? I have been convinced that graphql is a good thing, and I like to create backend systems with graphql, and setting it up with the GraphiQL, and it is really nice, but then I found out that everyone is talking about this apollo (code generation) thing that should be "THE WAY" for a front end developer to connect to the api, and now I am trying to understand this, and I am trying to create an android application which will be connecting to a graphql server. I am really sceptical about apollo...

Incompatible padding mode when decyrpt usiing Cipher with instance "RSA/ECB/PKCS1Padding" I had this problem when trying to decrypt an encrypted string. I had read a lot and also search for answers from Stack Overflow, but nothing works. You can see code I attach, it's not complex but the problem makes me confused. I'm using Kotlin, and yes, it's for Android. private fun generateKeyPair() { val keyStore = KeyStore.getInstance(ANDROID_KEYSTORE) keyStore.load(null) if (keyStore.containsAlias(keyAlias)) return val keyGenerator =...

Why my condition with if statement is not execute correctly . android I have a trouble with if statment in deleting some data from my cart . I have some data in recyclerview in my cart fragment , also have a button for deleting all these data from cart . I used a if statment to check if there is data(products) in the database or not . When remove button is clicked if there is any data in database, Delete query is implemented and remove all data . else there no data so just print a message for user : there is no product for deleting . The problem is when if...

Webview showing blank page after reopening the app In my activity there is fragment where there is webview everything is working fine but the problem is whenever I minimise the app and then reopen the app the webview shows a blank white page. I have to reload the fragment.in order to make the webpage visible again How to solve this problem Thanks in advance

handshake failed when url is https in just android 7 Hello my android app does not connect to the internet in android 7 and get failure in retrofit with message "handshake-failed", and in another android don't problem, just in android 7(Api 24)

How to create object with a possibly empty date? I have a class User which has: firstName:String, lastName:String, age:Int?, and dob:Date?. The values I am getting from editText boxes from the activity, straight forward. None of the fields are actually required, some or all of them might be empty. That's what I've got so far: private fun insertDataToDatabase() { val firstName = addFirstName_et.text.toString() val lastName = addLastName_et.text.toString() val age = addAge_et.text val dob = addDob_et.text val user =...

Send data from fragment to another when we use dependency injection for fragments Is there a way for sending data from a fragment to another without create new instance from it ? I inject my fragment but i faced with a problem that i describe it in below : We inject our fragments like this : val fragmentModule= module { factory { MyFragment() } } And this is a function for replace fragment : fun AppCompatActivity.replaceFragment(fragment: Class,frameId: Int){ supportFragmentManager .beginTransaction() .replace(frameId,fragment,null,null)...

"Assignments are not expressions, and only expressions are allowed in this context" compiling error when trying to encrypt file in kotlin [duplicate] I'm trying to encrypt a file in Kotlin, based on a java tutorial. And I'm currently unable to convert this to Kotlin because Kotlin doesn't support assignments inside a while loop context. Here's the code I'm trying to convert: byte[] input = new byte[64]; int bytesRead; while ((bytesRead = inFile.read(input)) != -1) { byte[] output =...

Get problem while calling a method of a class from fragment i have 2 classes here: #1 AlarmReceiver class AlarmReceiver: BroadcastReceiver() { ... fun setRepeatingAlarm(context: Context) {} //the method that i want to call } #2 SettingFragment (which is attached to SettingActivity) SettingFragment(): PreferencefragmentCompat() { private lateinit var reminder: String private lateinit var language: String private lateinit var alarmReceiver: AlarmReceiver private lateinit var langPreference: Preference private lateinit var reminderPreference:...

How to implement Parcelable on my class which contains an ArrayList<String>? I just want to know how to read and write the ArrayList. I use Kotlin.

Can we use multiple view-holders in paging data adapter of the paging 3.0 library I was building a chat app and was able to use multiple view-holders for when i received and sent messages. Can i do the same thing with a paging data adapter??

How To Use Async/Await/Coroutines In OnCompleteListener Firebase I am building a client application which uses Firebase for two things: User Authentication Using a realtime database I have managed to set up everything correctly on my client and on my backend server (using Firebase's Admin SDK) and am able to correctly authenticate users and allow them to read/write to the database. I am also using Retrofit2 to send requests from the client to the backend. As part of allowing users access to the database, it is needed to send the user's token to the backend...

ImageView src not shown in Accessibility Service Layout I have an Accessibility Service with which I want to overlay an image on the screen. When I put an ImageView in the layout it is shown in the Design Viewer but not on the device. Button/TextViews etc work fine, I've tried it as an XML/SVG and PNG, when I set a background color I can see the colored square on the device in the right place and size and everything but not the image. I've also tried using an android system resource as the image. The Layout : The service code: override fun...

data binding with fragment error cannot find BindingImpl class I have been struggling with this error and tried most of the solutions I found but no luck I made sure of Layout is the outermost tag enabled data binding spelling mistakes in xml set the view model in the fragment class import com.linguistic.linguistic.databinding.FragmentAddNewConversationBindingImpl; ^ symbol: class FragmentAddNewConversationBindingImpl This error only appears when I use the viewmodel in the xml call My xml: You will find me using viewModel in the first radio...

How to bind a viewmodel method in layout and pass a dynamic value to the viewmodel method Viewmodel suspend fun get_Organizations( username: String ) = withContext(Dispatchers.IO) { repository.get_organizations(username) } Layout

google api error- Could not get unknown property 'googlePlaceAPIKey' I am trying to run a project by inserting API key into build.gradle but getting the following error. Could not get unknown property 'googlePlaceAPIKey' for object of type com.android.build.gradle.internal.dsl.BaseAppModuleExtension buildTypes.each { it.resValue "string", 'AIzaSyCQwxwkCAfC2OcapBKTkzaloa3_0jFBknI', googlePlaceAPIKey } Please suggest a solution to it or if im missing out on any other prerequisites.

Is it possible that in future, Python will also get official support for android development? [closed] I am asking this because I am python enthusiast and I have just found out that neither Kotlin nor Java was designed exclusively for Python. I mean Java is older than android and an employee of jetbrains(I have forgot the name) said that they were not designing Kotlin as a language for Android, they were just trying to overcome some limitation of Java in Kotlin.

Easiest way to have a text input update lived based on another text field? I am very very new to Kotlin. I made a calculator app that could only add/subtract/multiply/divide and it was still a bit finicky, that's the extent of my knowledge. I would like to make a very simple app that convert from Celsius to Fahrenheit, BUT every demo I have seen so far required the user to hit a button after they are done inputting the temperature in order for the conversion to occur. I'd like to make the app have two text fields, which both update live as the other one is being...