kotlin

问题 Is there a way of deserializing json using sealed class Layer data class ShapeLayer(var type: LayerType) : Layer data class TextLayer(var type: LayerType) : Layer data class ImageLayer(var type: LayerType) : Layer LayerType is just some enum which can be used to distinguish which type should this object have. I thought I could add Adapter this way: class LayerAdapter{ @FromJson fun fromJson(layerJson: LayerJson): Layer { return when (layerJson.layerType) { LayerType.SHAPE -> PreCompLayer()

问题 Is there a way of deserializing json using sealed class Layer data class ShapeLayer(var type: LayerType) : Layer data class TextLayer(var type: LayerType) : Layer data class ImageLayer(var type: LayerType) : Layer LayerType is just some enum which can be used to distinguish which type should this object have. I thought I could add Adapter this way: class LayerAdapter{ @FromJson fun fromJson(layerJson: LayerJson): Layer { return when (layerJson.layerType) { LayerType.SHAPE -> PreCompLayer()

问题 Is there a way of deserializing json using sealed class Layer data class ShapeLayer(var type: LayerType) : Layer data class TextLayer(var type: LayerType) : Layer data class ImageLayer(var type: LayerType) : Layer LayerType is just some enum which can be used to distinguish which type should this object have. I thought I could add Adapter this way: class LayerAdapter{ @FromJson fun fromJson(layerJson: LayerJson): Layer { return when (layerJson.layerType) { LayerType.SHAPE -> PreCompLayer()

问题 I've got very strange error, because it only happens after installing app from generated .apk . When I try to run the app through IDE, it works fine. java.lang.IllegalAccessError: Method 'int <package>.BaseActivity$Companion.getANIMATION_SLIDE_FROM_RIGHT()' is inaccessible to class '<package>.MyActivity' (declaration of '<package>.MyActivity' appears in /data/app/<package>-mg7eYmJ8hX5WvkNWNZWMVg==/base.apk!classes3.dex) As you can see there is class called BaseActivity which looks like this:

问题 Here is my code :- Favourite Activity import android.content.Context import android.content.Intent import android.os.Bundle import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.ImageView import android.widget.TextView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import androidx.appcompat.widget.Toolbar import androidx.core.content.ContextCompat.startActivity import androidx.recyclerview.widget

问题 I have updated the project target API version to 30, and now I see that the systemUiVisibility property is deprecated. The following kotlin code is the one I'm using which is actually equivalent to setSystemUiVisibility method in Java. playerView.systemUiVisibility = (View.SYSTEM_UI_FLAG_LOW_PROFILE or View.SYSTEM_UI_FLAG_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_STABLE or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION)

问题 I have updated the project target API version to 30, and now I see that the systemUiVisibility property is deprecated. The following kotlin code is the one I'm using which is actually equivalent to setSystemUiVisibility method in Java. playerView.systemUiVisibility = (View.SYSTEM_UI_FLAG_LOW_PROFILE or View.SYSTEM_UI_FLAG_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_STABLE or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION)

问题 I am working with opencv on android for the development of an image segmentation application, but with the watershed algorithm. I am opening an image and creating a mask with the same image size and passing 0 for all the rows and columns of that mask. However, in the next step, which is to go through an array of 0 and add as coordinates in that array, I have the error: java.lang.NumberFormatException: For input string: "Mat [0 * 0 * CV_32FC1, isCont = true, isSubmat = false, nativeObj =

问题 I have a Java/Kotlin interop problem. A Kotlin immutable list is compiled into a normal java.util.ArrayList that is mutable! Kotlin (library): class A { val items: List<Item> = ArrayList() } Java (consumer): A a = new A(); a.getItems().add(new Item()); // Compiles and runs but I wish to fail or throw How to make my Kotlin class fully immutable from Java perspective too? 回答1: All non- Mutable____ collections in Kotlin are compile time read-only types by default, but not immutable . See the

问题 I have a Java/Kotlin interop problem. A Kotlin immutable list is compiled into a normal java.util.ArrayList that is mutable! Kotlin (library): class A { val items: List<Item> = ArrayList() } Java (consumer): A a = new A(); a.getItems().add(new Item()); // Compiles and runs but I wish to fail or throw How to make my Kotlin class fully immutable from Java perspective too? 回答1: All non- Mutable____ collections in Kotlin are compile time read-only types by default, but not immutable . See the