How to copress image before uploading with android? I am uploading some images through my app, some images because of their size are not able to be uploaded... How to solve this ? Please help if (requestCode == pickImageCode && resultCode == Activity.RESULT_OK && data != null) { table = data.data val arrayOfData = arrayOf(MediaStore.Images.Media.DATA) val myImageQuery = view!!.context.contentResolver.query(table, arrayOfData, null, null, null) myImageQuery.moveToFirst() val...

Handle fragment back navigation and bottom navigation view selected item I have implemented a bottomNavigationView which each option has its entry fragment and some has more navigation under the same option. Somehow like this: A->A1 B->B1 C->C1->C2 D->D1 E->E1->E2 Where A,B,C,D & E are the options (MenuItem) for the bottom navigation view and A1,B1,C1,D1,E1 are the entry fragments for those options repectivly The the desired navigation is that the entry AND exit point of the app will always be option A (entry fragment A1). So if the user navigates to...

Audio Visualiser using AudioRecord Class I am using this library Nier Visualizar to show these waves using AudioRecord class. It's working fine when I am Using AudioFormat.ENCODING_PCM_8BIT but Audio Records so buzzy and having a low voice. When I use AudioFormat.ENCODING_PCM_16BIT the voice is recording as normal but waves are Rendering too fast. I can also use MediaRecord for recording audio but There is No custom view which can provide...

How to fully implement the Navigation Drawer template in Kotlin I'm expecting this to be a really simple answer. I am developing my first real app on android (a workout tracker) and I am wanting it to have a navigation drawer layout for the majority of the app. I have a bunch of pages that I want the drawer to navigate to. I have figured out how to change the names of the menu items in activity_main_drawer.xml menu file, but I don't know how to attach a navigation to when the user taps on them. My code is the default code from the template:...

Error "Unable to find library" thrown when compiling native with Korge I'm trying to test out the Kotlin Game engine called Korge. I downloaded the default "Hello world!" template directly from their website. After downloading, I created a new project from existing files with IDEA and tried to run gradle's script called "runNativeDebug". I'm currently running Manjaro uname -a Linux lifeordeath-pc 4.19.45-1-MANJARO #1 SMP...

How does the TextInoutLayout observe String value via data binding and Livedata from Viewmodel? When I write this code with a normal editext, It works fine, when I do t with the TextInputLayout/TextInputEditText, it does not work. What I want is the input field(EditText) to observe the string via data binding. I've tried obersving it via code and via xml XML ViewModel //Fields val currentPassword = MutableLiveData() val newPassword = MutableLiveData() val confirmNewPassword = MutableLiveData() //Handler inner class Handler { val newPasswordFocusChanged = object :...

ToMap operator output I do not get why studying RXJAva I found this output, I would expect, considering that toMap returns an HashMap, a different output with a Map with 5 key values, instead I get only a Map with 3 key values {4=Beta, 5=Gamma, 7=Epsilon}, why? Observable.just("Alpha", "Beta", "Gamma", "Quattro", "Epsilon") .toMap(String::length)//output {4=Beta, 5=Gamma, 7=Epsilon} .subscribe({it -> println(it) })

Add numeric value on PDF field using Itext I am trying to pass a numeric value on a PDF but it passes as String. The issue is that the last line on PDF is used to sum all the values above but because the value is string and not integer this function does not work. val form = PdfAcroForm.getAcroForm(pdfDoc, true) val fields = form.formFields fields[newFieldName]?.setValue(value.valueAsString) ?.setFont(font) ?.setFontSize(TEXT_SIZE) The problem is the setValue...

Why kotlin-stdlib-1.3.31.jar does not have IntArray.class, MutableList.class even though they are part of stdlib? I want to figure out what are the system classes that are included in kotlin stdlib. But classes like IntArray, MutableList are not part of kotlin-stdlib.jar.

Interactive bottom view in android kotlin I need to do something like this (on the picture) in android Please can someone tell me how to reproduce that interactive bottom view in android kotlin

How to fix Unresolved reference: mInterstitialAd 'declare the same variable in another class in Kotlin' i'm new at Kotlin and i want to display interstitial ads but it won't because it's in another class (adapter class), and i don't know how to call the same variable in anothe class, this is how my code look like: class MainActivity : AppCompatActivity() { private lateinit var mInterstitialAd: InterstitialAd var adapter:ChaptersAdapter?=null var listOfChapters= ArrayList() override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState)...

How to exclude LatLng that is too far to include in the LatLngBounds due to max Google Map zoom? So I have to show as many markers as possible on my google map on Android. I use the following code to get the appropriate LatLngBounds to show the entire array of markers in one window on the screen: val builder = LatLngBounds.Builder() for (point in latLngPoints()) { builder.include(point) } val bounds = builder.build() googleMapCameraBoundsCalculated(bounds, gMap) private fun googleMapCameraBoundsCalculated(latLngBounds: LatLngBounds, gMap: GoogleMap) {...

Filter in MutableList Kotlin I have a listview which has a MutableList as adapter, this MutableList its populated with data from sqlite table, I also have a search menu in the toolbar, I need put text and filter in the ListView. I try this, but only puts the ListView in blank: override fun onCreateOptionsMenu(menu: Menu): Boolean { menuInflater.inflate(R.menu.menu_main,menu) val searchItem = menu.findItem(R.id.action_search) if(searchItem!=null){ val searchView=searchItem.actionView as SearchView...

Load user data in a new activity after selecting it from a recycler view My application currently shows a recycle view containing the names of users registered in the system using Firebase. Now I need to make this recycle view clickable, click on the user's name and open a new activity showing some data of it, for example the name. class PacienteAdapter(internal var context: Context) : RecyclerView.Adapter() { internal var userList: MutableList val lastItemId: String? get() = userList[userList.size - 1].id fun addAll(newUsers: List) {...

what is @PrimaryKey annotation? I'm coding some tutorials about Realm in Kotlin on Android. And I faced "@PrimaryKey". I have no idea what it is, how it works. Though I googled, I never find a good explanation about it. "@PrimaryKey" is used in a data model of Realm like below. open class TaskTitle : RealmObject(){ @PrimaryKey var id: Long = 0 var title: String = "" var itemsLeft : Int = 0 } I would appreciate if you would answer.

Gradle - commandLine in a for each I have the following code but only the last item from configFilesPath is being called in the commandLine line. Any ideas what I should be using - so that it runs commandLine for each of the items in configFilesPath? @TaskAction fun create() { project.exec({ workingDir(project.projectDir) var configFilesPath = Paths.get(System.getProperty("user.dir"), "../../../", "myconfig/"); //Create symlinks for all files in myconfig/...

Specify difference between <*>, <T> and <Any> in kotlin [duplicate] This question already has an answer here: Difference between “*” and “Any” in Kotlin generics 2 answers I have so much confusion among , and casting of any object. Can any one have proper explanation with example for this?

Simple Generic Function in Kotlin Fails Here's a simple generic function in Kotlin: fun twice(x: T) : T { return 2 * x } Attempting to build this (either in a project or REPL) results in the following errors: error: none of the following functions can be called with the arguments supplied: public final operator fun times(other: Byte): Int defined in kotlin.Int public final operator fun times(other: Double): Double defined in kotlin.Int public final operator fun times(other: Float): Float defined in kotlin.Int public final...

How to deserialize number value in Firestore field and read this inside de while/loop using kotlinx.coroutines In the firestore I created a field named PararUm, type number (it does not have Int, when I enter it manually) and I put value 1. The problem is that the return has been PararUm(PararUm=1) and not just 1. (99-below) When I resolved this, I would have solved the first part of the project. Regarding the second, I want to use kotlinx.coroutines to work within a while/loop (which queries the value of the PararUm field) in a synchronous, non-asynchronous way (as firebase requires) Can I do...

Filter a String which holds a TimeStamp - Kotlin I have written a function which generate a TimeStamp and convert it to a String using toString(). I want to remove the whitespaces and other special character from that string. Is there is any efficient way to do it ? This is a function which generate ID using TimeStamp , since timestamp will be unique (Note : When IDs are generated at different M.Sec) fun autoGenerateID() : String = Timestamp(java.util.Date().getTime()).toString() When I call the function, It should return :...

Disable ViewPager swipe when swiping on a certain View I want to keep the swiping feature of my ViewPager however I want to disable it just when swiping on a certain View in my layout file (a custom Preference which I'm extending): activity.xml activity.kt override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_home) viewpager.addOnPageChangeListener(this) // Initialise FragmentAdapter val fragmentAdapter = ScreenSlidePagerAdapter(supportFragmentManager)...

Which type of lock user used to unlock the screen using keyguardManager This is the code i am using to use app lock and on activity result I want the type of lock .Because I don't think google provide this so help me if any one know how to do it fun authenticateApp() { //Get the instance of KeyGuardManager val keyguardManager = getSystemService(KEYGUARD_SERVICE) as KeyguardManager; //Check if the device version is greater than or equal to Lollipop(21) if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { //Create an intent to...

Custom transition on glide replace image without showing white background I am trying to show a custom transition between two images without the trouble of white background. Now it works well with default DrawableCrossFadeTransition(1000, isFirstResource) but I am unable to create my own Transition object which includes my R.anim. Simply applying that to Glide request builder's method transition is easy with GenericTransitionOptions although I am not able to figure how to do the same with target.onResourceReady Glide.with(view.context)...

How to get raw json response of Retrofit in Kotlin? I am new to Kotlin and Retrofit. I want to call a base URL through Retrofit and print the raw JSON response. What would be the simplest minimal configuration? Let's say, base url = "https://devapis.gov/services/argonaut/v0/" method = "GET" resource = "Patient" param = "id" I tried, val patientInfoUrl = "https://devapis.gov/services/argonaut/v0/" val infoInterceptor = Interceptor { chain -> val newUrl = chain.request().url() .newBuilder()...

Why does switching to Kotlin break Android Studio code assist When developing in the Java programming language within Android Studio there are a number of time saving shortcuts such as typing logt logd logm that add Log Cat statements Why do these not work when developing with Kotlin?

How can i call an interface in kotlin? I do not have a project in my work and they have asked me to give me a pass, but after passing the whole project, there is a part that has given me a code error at the moment. Clearly it's my first time in Kotlin and I have no idea, but I do have an idea. I tried to solve it and I have not succeeded. So I was asking for help. I get an error right at the beginning of the = SpeechService.Lintener { Here the code private val mSpeechServiceListener = SpeechService.Listener { text: String?,...

Is getExternalFilesDir(null).absolutePath fixed? So I'm working on two apps, one writes files, the other uploads the files and delete them. I save the files using val file = File(content.getExternalFilesDir(null), "$fileName.csv") And tested it on two different phones, both shows that file is saved to the path /storage/emulated/0/Android/data/com.example.app1/files/ My question is will the path be the same on any other phones? or will it vary from different os version and phones? Should i hardcore the path in the upload app? or...

How to overload methods in Kotlin My current Android application employs Kotlin & Room I have a BaseDAO interface with this method to support inserting a multiple objects of the same type. /** * Insert multiple objects in the database. * * @param obj the objects to be inserted. */ @Insert(onConflict = OnConflictStrategy.REPLACE) fun insert(obj: List) : List I would also like to have an insert method that accepts a single instance of a DO like this in my specific DAO interface @Dao...

finish monkey in specified time? how can run monkey test 200 event in 5 min in android ADB? monkey -p com.test.app -v --throttle 1000 2000 I run 2000 event but throttle not work, time is random. can I set a special time? for exmaple run just in 5 min

Check for boolean when null If the field "size" is null, this will throw an exception: if (p!!.company?.industries?.size > 0) job.industryName = p?.company?.industries!![0] I tried using .size!! but this generated an exception as well. How do I check if size is greater than zero? I can use this: if (p!!.company?.industries!!.isNotEmpty()) job.industryName = p?.company?.industries!![0] But I would like to do this using a > to better understand how to do it with any value.