Android App Static Shortcut with Navigation Library My app has one static shortcut, and I'm using the navigation architecture component. I'm using the following implementation but it does not work on Android 9. In my MainActivity: override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setupToolbar() setupNavigationDrawer() checkPermissions() if (intent.action == MoneyBook.SHORTCUT_ACTION_ADD_BOOKENTRY) {...

How to fix a FileNotFoundExeption when reading a Property Source in a Spring Boot application deployed on Amazon EB? I have a properties file stored in a config folder(excluded from vcs) on the root of my project. The file contains credentials and I read the file by annotating my class with @PropertySource. This works fine when reading running the spring boot application locally but it spits an error when deployed on EB. I've tried using a relative path instead of an absolute path to prevent an error with from trying to read from my local machines file system....

Why does LiveData better than MutableLiveData? In many samples i see that: class DataViewModel{ val data:LivaData get() = _data private val _data = MutableLiveData() } But more simply looks like this: class DataViewModel{ val data = MutableLiveData() } so, why need this more complicated code construction with 2 fields?

Check if a local lateinit variable is initialized Member lateinit variables initialization can be checked with: class MyClass { lateinit var foo: Any ... fun doSomething() { if (::foo.isInitialized) { // Use foo } } } However this syntax doesn't work for local lateinit variables. Lint reports the error: "References to variables aren't supported yet". There should logically be a way to do that since lateinit variables are null internally when uninitialized. Is there a way to check if local...

Find-first-and-transform for Sequence in Kotlin I often stumble upon this problem but don't see a common implementation: how do I idiomatically find an element, stop search after the match, and also return a different type (i.e. map whatever matched to another type)? For example, Files.list(someDir).asSequence().map { it.toFile() }.first { it.useLines { it.first { it == "123" // but also want to return the String that matched as Int } } }.run { thisShouldBeTheMatchedInt -> } I've been able to...

Why we should avoid using open members of base class? While i am reading document of Kotlin, i saw that we should avoid using open properties declared at base class: It means that, by the time of the base class constructor execution, the properties declared or overridden in the derived class are not yet initialized. If any of those properties are used in the base class initialization logic (either directly or...

Kotlin use UInt for array access unsigned data types could be nice for array access. Usually the indexes are unsigned anyway. But currently I cannot directly do this. E.g. this code. val foo = 1.toUInt() "foo"[foo] fails to compile with: error: type mismatch: inferred type is UInt but Int was expected what is the best way to deal with this? Sure I could do: val foo = 1.toUInt() "foo"[foo.toInt()] but this feels wrong somehow. UInt is an inline class anyway and gets erased to Int anyway - so I think this should not...

How do I do a job when a device reboots? The manifest looks like this: The code: class BootReceiver: BroadcastReceiver() { override fun onReceive(context: Context, intent: Intent) { if(Intent.ACTION_BOOT_COMPLETED == intent.action) { Log.d("TEST", "Called") } } } When I reboot my device I don't receive BOOT_COMPLETED. How do I perform job when a device launches without user intervention?

Which context do i use to load resources in a singleton? I have a SoundPool that I want to play in different fragments. So I load it within a singleton. What context do I have to use? object PingSoundPool { fun loadpings(note: Int) { val context = Application() val mAttributes = AudioAttributes.Builder() .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION) .setUsage(AudioAttributes.USAGE_GAME) .build() val mSoundPool = SoundPool.Builder() .setMaxStreams(9)...

What is the internal kotlin modifier in byte code? If I create library with kotlin and mark some class with internal, how does it look from java with no Kotlin plugin in maven and in IDE, it will be just public or package or JVM has other modifiers that java has not? if I use in a module one class with @service annotation and mark it internal, and use this module in other module, Does it work? How does it look in byte code?

what is a reified String, instead of a null I was reading this blog and cannot understand what is meant below for reified String. Both Swift and Kotlin have incorporated the concept of nullable types. The fact that a variable can contain a null becomes part of the type of that variable. A variable of type String cannot contain a null; it can only contain a reified String. On the other hand, a variable of type String? has...

Applying multiple ForegroundColorSpan I want to apply ForegroundColorSpan to multiple words in a given string. However, only the last applied span is taking effect. My code is: private fun formatString(target: String, vararg formattableWords: String): SpannableString { val spannableString = SpannableString(target) val colorSpan = ForegroundColorSpan(ContextCompat.getColor(context!!, R.color.colorPrimary)) formattableWords.forEach { formattableWord -> val start = target.indexOf(formattableWord, ignoreCase...

MediaPlayer, RecyclerAdapter shows a few play buttons Recycle view should show a few songs and one button play, but instead of this it shows a few songs and a few buttons play, seems like I do something wrong. I initialized songTitle TextView and testButtonPlay button in sound_template.xml layout. If I'm initializing testButtonPlay in my activity with RecyclerView I'm getting error: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageButton.setOnClickListener(android.view.View$OnClickListener)'...

ERROR: The Android Gradle plugin supports only Kotlin Gradle plugin version 1.3.0 and higher please how can I solve this error ? ERROR: The Android Gradle plugin supports only Kotlin Gradle plugin version 1.3.0 and higher. The following dependencies do not satisfy the required version: root project 'android' -> org.jetbrains.kotlinkotlin gradle plugin1.0.6 Affected Modules: android-app WARNING: Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'. It will be removed at the end of 2018. For more information see: <a...

Where to load SoundPool for Applicationwide access I want to use a SoundPool globally, so that every fragment can access its play method. For this, i have a class like this: class PingSoundPool(context: Context) { val mAttributes = AudioAttributes.Builder() .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION) .setUsage(AudioAttributes.USAGE_GAME) .build() val mSoundPool = SoundPool.Builder() .setMaxStreams(9) .setAudioAttributes(mAttributes) .build() val abping =...

How to write for loop in Kotlin What is the equivalent code of this version of for loop in Kotlin? for(int i = 0; i < 5 ; i++) { //Body }

Activity must not be null error , Kotlin android I have 4 fragments in Tablayout "Home" ,"Market" , "Office" and "Admin" and 3 table in Sqlite for "Home" , "Office" and "Market" In Admin fragment admin takes the data with table name and store in its respective table and display in recyclerView of each respective fragment but it shows activity must not be null Admin_Fragment package com.example.muhammadrizwan.deafanddumbcommunicationaid.Fragments import android.app.Activity import android.app.AlertDialog import...

TextView border colour not set to yellow after calling it I am learning Android and have created a TableLayout with two rows in an Activity called PlayActivity. In each row I put TextViews that I want to have borders in the colours with suffix Edge given in colors.xml. Everything works fine except that the YELLOW (text) colour does not lead to yellow border colour in tv.setBackgroundResource(R.drawable.yellow_edge). I am making a game where the user ends up in the PlayActivity and draws a number of tiles from a "bag". These tiles have a number in...

How to get the current visible fragment in kotlin? In java I get the visible fragment as: private Fragment getCurrentFragment() { FragmentManager fragmentManager = HomeActivity.this.getSupportFragmentManager(); List fragments = fragmentManager.getFragments(); for (Fragment fragment : fragments) { if (fragment != null && fragment.isVisible()) return fragment; } return null; } How to get the visible fragment in kotlin ?

Android app: Initiate a skype call and close skype when call is finished I have an Android application which initiates a skype call via standard intent. Like this one: val sky = Intent("android.intent.action.VIEW") sky.data = Uri.parse("skype:") sky.component = ComponentName("com.skype.raider", "com.skype.raider") startActivity(sky) But after the call is finished user still has to exit skype and go back to my app manually. I wonder if it is possible to bring user back to my app right after the call is finished?

How to target both JVM/Native and Android with Kotlin I'm stuck trying to write code shared by server (Kotlin native/JVM) and client (Android) I have both Android Studio and IntelliJ IDEA. I want to be able to write Kotlin code that can be used from my Android project and also used independently (either JVM or Native, not sure yet). IntelliJ has lots of nice multiplatform option on project setup but I can't build them from Android studio. Kotlin shared project has this plugin plugins { id 'kotlin-multiplatform' version '1.3.11' } And...

How do I center a logo in the ActionBar? I am trying to center a logo in the MainActivity ActionBar but when I add this getSupportActionBar().setDisplayShowHomeEnabled(true); getSupportActionBar().setLogo(R.drawable.thelogo); getSupportActionBar().setDisplayUseLogoEnabled(true); it looks like this Is there no way to center it without having to change my RelativeLayout to a LinearLayout?

Cannot add task 'clean' as a task with that name already exists I have a project that I started in Java on Android Studio and I want to continue it in Kotlin. So I configured my project to integrating Kotlin by this way "Configure Kotlin in Project" After that Android Studio changed my twice build.gradle files. But from that moment my sync started to fail. there is my build.gradle file where the error occurs : before : buildscript { repositories { google()...

Speed up filter of large list in Kotlin I've got an ArrayList with about 4000 Pairs (points on a grid). At one point I need to get the points in a certain range of x and y coordinates. My code so far is: val points: ArrayList = // ... val xRange: IntRange = x: Int - spacingX: Int .. x: Int + spacingX: Int val yRange: IntRange = y: Int - spacingY: Int .. y: Int + spacingY: Int val nearPoints: ArrayList = points.filter { xRange.contains(it.first) && yRange.contains(it.second) } It is considerably faster than iterating over the...

Google Guice runtime dependency injection I am looking for a way to dynamically select the correct dependency during runtime using google guice. My usecase is a kotlin application which can work with either sqlite or h2 databases depending on the configuration file provided. The file is read when the application is executed and if the database is not found, the correct one is created and migrated into. My database structure contains the Database (Interface), H2Database: Database, SQLiteDatabase: Database and the module binding...

Android Kotlin: How to update recyclerView after async call? getting CalledFromWrongThreadException I am trying to do an async call and then update a RecyclerView. Much like what's outlined in this question: RecyclerView element update + async network call However, when I try to do this, I get this error: android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. Here is my code (the main issue is in the...

editText is in focus, but the virtual keyboard dont open automatically using SHOW_IMPLICIT When i use SHOW_FORCED the keyboard open, but when i closing the alertDialog, the keyboard change to text layout and does not hidden, keyboard only closes when the back button of the android is pressed, simulating back button in the code does not work. And using SHOW_IMPLICIT dont open keyboard automatically. ***The commented code works but... private fun insertItemQuantity(orderDetail: OrderDetail) { val modal = alert { customView { verticalLayout {...

Layout preview not rendering - possibly due to androidx.widget The layout preview in Android Studio isn't rendering and I am unsure why. I have everything updated to the latest version, and it seems to run fine on other computers. My professor wasn't sure how to fix this and all the other layout rendering Stack Overflow posts I could find are outdated. I've tried refreshing it, restarting it, rebuilding it, invalidating caches, etc... The best clue I could get is that it has to due with the androidx.constraintlayout.widget.ConstraintLayout not being...

How to get a value from a sharedpreference of a java activity in a kotlin? I'm making a video app, however it's all in java, while the player is in Kotlin. How do I get the value of a particular sharedpreference and point to where should the video link be? playervideo.setSource(Uri.parse("link here))

Micronaut cli graphql setup Is it possible to pass a feature to micronaut cli to integrate a new application with graphQL, for example like this: mn create-app -f grephql name