Recent questions tagged Kotlin

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kotlin - Use microphone in webrtc & media recorder simultaneously in Android?

I am using webrtc for video calling in android. I am simultaneously screen recording after call is connected in ... out to resolve this error. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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925 views

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kotlin - How to join multiple instances of same object in Android Room?

NOTE: I cannot use relation as we had performance issue which is not reproduced on direct join query. ... name: main.chat_user.chat_user_id) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - moshi custom qualifier annotation to serialise null on one property only

I'd like to serialise null for only one property in my JSON body that is going on a PUT. I don't ... .create(moshi)) .build() } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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647 views

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kotlin - Retain EditText with Screen Rotation using Databinding Library

I have two classes AdminPinActivity.kt and AdminPinActivityPresenter.kt AdminPinActivity.kt: class AdminPinActivity : ... </layout> See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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902 views

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kotlin - CharSet for MS Access '97 DB using UCanAccess

Hey I am reading a database using ucanaccess-5.0.0. The database is propably < Access 2000, since it's not UTF-8 ... DB. What can I do about it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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846 views

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kotlin - How are Android activities handled with Jetpack Compose and Compose Navigation?

I'm currently studying Jetpack Compose in an attempt to build a feature-rich application using modern Android ... discouraged for some reason? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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699 views

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kotlin - What is the android version of css transform in html

In css for html there are a number of different things that you can do with the transform attribute. this ... SkewX and SkewY) mentioned above? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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765 views

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kotlin - Write permissions not working - scoped storage Android SDK 30 (aka Android 11)

Anyone else finding scoped-storage near-impossible to get working? lol. I've been trying to understand how to allow ... different file") } } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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748 views

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kotlin - Best way to handle such scenario where "smart cast is imposible"

I wonder what is the best way to handle such scenario class Person(var name:String? = null, var age:Int? = null) ... let name?.let{ doSth(it) } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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kotlin - Android Two Way DataBinding Problem of Ternary Operator Must be Constant

My EditText is like this: <EditText android:layout_width="0dp" android:layout_height="wrap_content" android: ... two-way DataBinding. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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908 views

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kotlin - How do you Disable Certain Days on a Datepicker - Android

I'm trying to implement a datepicker but I need to disable some days. For example, I do not want the user to ... in Kotlin. Someone help me plz. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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674 views

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kotlin - What is the purpose of having bound class reference return a covariant type?

I'm playing with reflection and I came out with this problem. When using bound class reference via the ::class ... an invariant type by design. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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kotlin - Zip 3 lists of equal length

Is there a standard operation in Kotlin stdlib which would allow to iterate over a zip of 3 (or more) lists? Effectively ... > listOf(a, b, c)} See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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999 views

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kotlin - Cannot create instance of viewmodel after using Hilt in Android

Here is my AllFilesListViewModel class. class AllFilesListViewModel @ViewModelInject constructor( private val pdfItemRepository: ... .appbar.V See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

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kotlin - How to call a lambda callback with mockk

I create a mock of a class with mockk. On this mock I now call a method that gets a lambda as a ... the mock to call the passed lambda? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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752 views

1 answer

kotlin - java.lang.UnsupportedOperationException: Reflective setAccessible(true) disabled

When I run my Ktor application with gradle run then I've got the following exception: 19:21:11.795 [main] DEBUG ... mode) What am I doing wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.6k views

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kotlin - Only safe (?.) or non-null asserted (!!.) calls are allowed on a nullable receiver of type String?

fun checkLengthA(str : String?): Int = if (str.isNullOrBlank()) 0 else str.length "Only safe (?.) or ... anyone explain why it is happening? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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854 views

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kotlin - Convert a nullable type to its non-nullable type?

I have a bunch of beans that have nullable properties like so: package myapp.mybeans; data class Foo(val name ... to get around these scenarios? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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kotlin - Disable Android 12 default splash screen

In the google I/O presentation, google team says that we can disable the default splash screen. I want to ... splash screen, not disabling it. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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707 views

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kotlin - Why is "3rd-party Gradle plug-ins may be the cause" showing after updating Gradle to 3.1.0?

After updating Gradle to com.android.tools.build:gradle:3.1.0, in the log I now see: Folder E: ... plug-ins may be the cause See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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878 views

1 answer

kotlin - Android APIv29 FileNotFoundException EACCES (Permission denied)

I'm not able to access storage when building for targetSdkVersion v29. Here is my gradle configuration: ... .filesDir.absolutePath } Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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781 views

1 answer

kotlin - How to extend a data class with toString

I have created a data class data class Something ( val a : String, val b : Object, val c : String ) ... toString method of a custom dataclass? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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kotlin - How to extend a data class with toString

I have created a data class data class Something ( val a : String, val b : Object, val c : String ) ... toString method of a custom dataclass? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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706 views

1 answer

kotlin - Function definition: fun vs val

I'm curious about what is the suggested way to define member functions in Kotlin. Consider these two member ... semantics that I am missing? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

1 answer

kotlin suppress warning deprecated for Android

In my Kotlin Android project, I am using a function that has been deprecated starting from api 23, which is quite ... an easy way to do so? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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982 views

1 answer

kotlin - Assignment not allowed in while expression?

In Java we can usually perform an assignment within the while condition. However Kotlin complains about it. So the following ... ); } But is it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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807 views

1 answer

kotlin - How to turn a Mutable Collection into an Immutable one

I was writing a small piece of code in which I internally handle my data in a mutable map, which in ... one. Any advice or recommendations? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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850 views

1 answer

kotlin - Use of Boolean? in if expression

If I have a nullable Boolean b, I can do the following comparison in Java: Boolean b = ...; if (b != ... this imposes). This is the result: See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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