While I appreciate generating random numbers in a Composable kotlinlang #compose

While I appreciate generating random numbers in a ...

Chris Miller

09/30/2021, 10:45 AM

While I appreciate generating random numbers in a @Composable is a bad thing to do, I don't think the following should fail to @Preview? (See thread for exception)

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@Preview @Composable
fun PreviewTest() { Random.nextBoolean(); Text("Hello World") }

Chris Miller

09/30/2021, 10:45 AM

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java.lang.ClassCastException: class kotlin.internal.jdk8.JDK8PlatformImplementations cannot be cast to class _layoutlib_._internal_.kotlin.internal.PlatformImplementations (kotlin.internal.jdk8.JDK8PlatformImplementations is in unnamed module of loader com.intellij.ide.plugins.cl.PluginClassLoader @4bad8c4; _layoutlib_._internal_.kotlin.internal.PlatformImplementations is in unnamed module of loader org.jetbrains.android.uipreview.ModuleClassLoader @9fc06f1)
	at _layoutlib_._internal_.kotlin.internal.PlatformImplementationsKt.<clinit>(PlatformImplementations.kt:54)
	at _layoutlib_._internal_.kotlin.random.Random.<clinit>(Random.kt:271)
	at TestKt.PreviewTest(Test.kt:7)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at androidx.compose.ui.tooling.CommonPreviewUtils.invokeComposableMethod(CommonPreviewUtils.kt:149)
	at androidx.compose.ui.tooling.CommonPreviewUtils.invokeComposableViaReflection$ui_tooling_release(CommonPreviewUtils.kt:188)
	at androidx.compose.ui.tooling.ComposeViewAdapter$init$3$1$composable$1.invoke(ComposeViewAdapter.kt:571)
	at androidx.compose.ui.tooling.ComposeViewAdapter$init$3$1$composable$1.invoke(ComposeViewAdapter.kt:569)
	at androidx.compose.ui.tooling.ComposeViewAdapter$init$3$1.invoke(ComposeViewAdapter.kt:608)
	at androidx.compose.ui.tooling.ComposeViewAdapter$init$3$1.invoke(ComposeViewAdapter.kt:564)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:107)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
	at androidx.compose.runtime.CompositionLocalKt.CompositionLocalProvider(CompositionLocal.kt:215)
	at androidx.compose.ui.tooling.InspectableKt.Inspectable(Inspectable.kt:64)
	at androidx.compose.ui.tooling.ComposeViewAdapter$WrapPreview$1.invoke(ComposeViewAdapter.kt:513)
	at androidx.compose.ui.tooling.ComposeViewAdapter$WrapPreview$1.invoke(ComposeViewAdapter.kt:512)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:107)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
	at androidx.compose.runtime.CompositionLocalKt.CompositionLocalProvider(CompositionLocal.kt:215)
	at androidx.compose.ui.tooling.ComposeViewAdapter.WrapPreview(ComposeViewAdapter.kt:508)
	at androidx.compose.ui.tooling.ComposeViewAdapter.access$WrapPreview(ComposeViewAdapter.kt:121)
	at androidx.compose.ui.tooling.ComposeViewAdapter$init$3.invoke(ComposeViewAdapter.kt:564)
	at androidx.compose.ui.tooling.ComposeViewAdapter$init$3.invoke(ComposeViewAdapter.kt:561)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:107)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
	at androidx.compose.ui.platform.ComposeView.Content(ComposeView.android.kt:384)
	at androidx.compose.ui.platform.AbstractComposeView$ensureCompositionCreated$1.invoke(ComposeView.android.kt:228)
	at androidx.compose.ui.platform.AbstractComposeView$ensureCompositionCreated$1.invoke(ComposeView.android.kt:227)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:107)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
	at androidx.compose.runtime.CompositionLocalKt.CompositionLocalProvider(CompositionLocal.kt:215)
	at androidx.compose.ui.platform.CompositionLocalsKt.ProvideCommonCompositionLocals(CompositionLocals.kt:148)
	at androidx.compose.ui.platform.AndroidCompositionLocals_androidKt$ProvideAndroidCompositionLocals$3.invoke(AndroidCompositionLocals.android.kt:114)
	at androidx.compose.ui.platform.AndroidCompositionLocals_androidKt$ProvideAndroidCompositionLocals$3.invoke(AndroidCompositionLocals.android.kt:113)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:107)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
	at androidx.compose.runtime.CompositionLocalKt.CompositionLocalProvider(CompositionLocal.kt:215)
	at androidx.compose.ui.platform.AndroidCompositionLocals_androidKt.ProvideAndroidCompositionLocals(AndroidCompositionLocals.android.kt:106)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1$1$3.invoke(Wrapper.android.kt:162)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1$1$3.invoke(Wrapper.android.kt:161)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:107)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
	at androidx.compose.runtime.CompositionLocalKt.CompositionLocalProvider(CompositionLocal.kt:215)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1$1.invoke(Wrapper.android.kt:161)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1$1.invoke(Wrapper.android.kt:144)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:107)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
	at androidx.compose.runtime.ComposerKt.invokeComposable(Composer.kt:3330)
	at androidx.compose.runtime.ComposerImpl$doCompose$2$5.invoke(Composer.kt:2577)
	at androidx.compose.runtime.ComposerImpl$doCompose$2$5.invoke(Composer.kt:2573)
	at androidx.compose.runtime.SnapshotStateKt.observeDerivedStateRecalculations(SnapshotState.kt:540)
	at androidx.compose.runtime.ComposerImpl.doCompose(Composer.kt:2566)
	at androidx.compose.runtime.ComposerImpl.composeContent$runtime_release(Composer.kt:2517)
	at androidx.compose.runtime.CompositionImpl.composeContent(Composition.kt:476)
	at androidx.compose.runtime.Recomposer.composeInitial$runtime_release(Recomposer.kt:727)
	at androidx.compose.runtime.CompositionImpl.setContent(Composition.kt:432)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1.invoke(Wrapper.android.kt:144)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1.invoke(Wrapper.android.kt:135)
	at androidx.compose.ui.platform.AndroidComposeView.setOnViewTreeOwnersAvailable(AndroidComposeView.android.kt:727)
	at androidx.compose.ui.platform.WrappedComposition.setContent(Wrapper.android.kt:135)
	at androidx.compose.ui.platform.WrappedComposition.onStateChanged(Wrapper.android.kt:187)
	at androidx.lifecycle.LifecycleRegistry$ObserverWithState.dispatchEvent(LifecycleRegistry.java:354)
	at androidx.lifecycle.LifecycleRegistry.addObserver(LifecycleRegistry.java:196)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1.invoke(Wrapper.android.kt:142)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1.invoke(Wrapper.android.kt:135)
	at androidx.compose.ui.platform.AndroidComposeView.onAttachedToWindow(AndroidComposeView.android.kt:814)
	at android.view.View.dispatchAttachedToWindow(View.java:20753)
	at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3490)
	at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3497)
	at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3497)
	at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3497)
	at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3497)
	at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3497)
	at android.view.AttachInfo_Accessor.setAttachInfo(AttachInfo_Accessor.java:57)
	at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:362)
	at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:436)
	at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:121)
	at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:714)
	at com.android.tools.idea.rendering.RenderTask.lambda$inflate$7(RenderTask.java:870)
	at com.android.tools.idea.rendering.RenderExecutor$runAsyncActionWithTimeout$2.run(RenderExecutor.kt:187)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)

Csaba Kozák

09/30/2021, 11:00 AM

Seems to be a bug. You could open an issue.

Chris Miller

09/30/2021, 11:03 AM

OK thanks, will do

Chris Miller

09/30/2021, 11:11 AM

I didn't manage to find it earlier but it looks like someone has reported this already https://issuetracker.google.com/issues/197954277

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