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# compose
a

Alderson Elliot

05/15/2022, 11:18 AM
what is wrong? why i can't use preview
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java.lang.ClassNotFoundException: android.window.OnBackInvokedCallback
	at com.android.tools.idea.rendering.classloading.loaders.DelegatingClassLoader.findClass(DelegatingClassLoader.kt:81)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:589)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	at com.android.tools.idea.rendering.classloading.loaders.DelegatingClassLoader.loadClass(DelegatingClassLoader.kt:65)
	at androidx.compose.ui.tooling.ComposeViewAdapter$FakeOnBackPressedDispatcherOwner$1.<init>(ComposeViewAdapter.kt:733)
	at androidx.compose.ui.tooling.ComposeViewAdapter.<init>(ComposeViewAdapter.kt:732)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
	at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:339)
	at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:176)
	at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:136)
	at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadView(LayoutlibCallbackImpl.java:301)
	at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:417)
	at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:428)
	at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:332)
	at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:965)
	at android.view.LayoutInflater.inflate(LayoutInflater.java:663)
	at android.view.LayoutInflater.inflate(LayoutInflater.java:505)
	at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:363)
	at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:436)
	at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:121)
	at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:739)
	at com.android.tools.idea.rendering.RenderTask.lambda$inflate$8(RenderTask.java:895)
	at com.android.tools.idea.rendering.RenderExecutor$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)java.lang.ClassNotFoundException: android.window.OnBackInvokedCallback
	at com.android.tools.idea.rendering.classloading.loaders.DelegatingClassLoader.findClass(DelegatingClassLoader.kt:81)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:589)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	at com.android.tools.idea.rendering.classloading.loaders.DelegatingClassLoader.loadClass(DelegatingClassLoader.kt:65)
	at androidx.compose.ui.tooling.ComposeViewAdapter$FakeOnBackPressedDispatcherOwner$1.<init>(ComposeViewAdapter.kt:733)
	at androidx.compose.ui.tooling.ComposeViewAdapter.<init>(ComposeViewAdapter.kt:732)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
	at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:339)
	at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:176)
	at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:136)
	at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadView(LayoutlibCallbackImpl.java:301)
	at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:417)
	at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:428)
	at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:332)
	at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:965)
	at android.view.LayoutInflater.inflate(LayoutInflater.java:663)
	at android.view.LayoutInflater.inflate(LayoutInflater.java:505)
	at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:363)
	at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:436)
	at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:121)
	at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:739)
	at com.android.tools.idea.rendering.RenderTask.lambda$inflate$8(RenderTask.java:895)
	at com.android.tools.idea.rendering.RenderExecutor$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)
c

Chrimaeon

05/15/2022, 12:03 PM
Looks like you have a general compile error on your project. Preview needs your project to be compiled. have a look at you activity if everything is implemented correctly.
also check your target sdk version. 
OnBackInvokedCallback
is a API “Tiramisu” feature. https://developer.android.com/reference/android/window/OnBackInvokedCallback
a

Alderson Elliot

05/15/2022, 1:14 PM
project compiled success but can't use preview
c

Chrimaeon

05/15/2022, 1:23 PM
Have a look here https://issuetracker.google.com/issues/227767363 seems like a versioning issue of the libraries
a

Alderson Elliot

05/15/2022, 1:31 PM
🥳 thank you very much
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dependencies {
    implementation(project(":shared"))
    implementation("androidx.activity:activity-compose:1.5.0-rc01")
    implementation("androidx.compose.material:material:1.2.0-beta01")
    implementation("com.google.android.material:material:1.6.0")

    debugImplementation("androidx.customview:customview:1.2.0-alpha01")
    debugImplementation("androidx.customview:customview-poolingcontainer:1.0.0-beta01")

    debugImplementation("androidx.compose.ui:ui-tooling:1.2.0-beta01")
    implementation("androidx.compose.ui:ui:1.2.0-beta01")
    implementation("androidx.compose.ui:ui-tooling-preview:1.2.0-beta01")
    implementation("androidx.compose.foundation:foundation:1.2.0-beta01")
}
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