【发布时间】：2019-06-26 07:24:40
【问题描述】：
正如标题所暗示的那样，当我在任何 xml 文件的布局中的任何位置都有一个浮动操作按钮时，预览将停止工作，我可以逐字注释掉它，它会立即完美地重绘。有什么想法吗？
我尝试过多次重置同步、使缓存失效等。 当我重置视图时，视图呈现正常，但仅对于打开的页面，我打开后的任何页面都不会呈现，并且导航回之前呈现的布局会破坏它
我唯一能想到的是我在我的项目中使用了氏族浮动操作按钮，但它是谷歌的那个打破了我的预览。
编辑我已删除氏族清理项目无效缓存重新启动，但问题仍然存在
另外，如果我将 FloatingActionButton 更改为 ExtendedFloatingActionButton，预览画得很好，查看这两个似乎它们扩展了完全不同的类
同样使用 AndroidX
这里是一个不会渲染的 xml 示例
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".settings.PdfSettingsActivity">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:scaleType="centerCrop"
android:layout_margin="@dimen/activity_vertical_margin_16dp"
android:elevation="@dimen/activity_horizontal_margin_4dp"
android:id="@+id/pdf_renderer"/>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/share"
android:layout_margin="@dimen/activity_vertical_margin_16dp"
android:src="@drawable/ic_share_white_24dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
如果我注释掉浮动操作按钮，视图会立即呈现
com.google.android.material.floatingactionbutton.FloatingActionButton
Android Studio 3.4.1 Build #AI-183.6156.11.34.5522156，构建于 5 月 1 日， 2019 JRE：1.8.0_152-release-1343-b01 x86_64 JVM：OpenJDK 64 位服务器 VM by JetBrains s.r.o macOS 10.14.3
编辑
现在只是玩弄它，我设法让它抛出一个错误：
java.lang.IllegalArgumentException: java.lang.ClassCastException@54291cbb
at sun.reflect.GeneratedMethodAccessor971.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at android.animation.PropertyValuesHolder_Delegate.callMethod(PropertyValuesHolder_Delegate.java:108)
at android.animation.PropertyValuesHolder_Delegate.nCallFloatMethod(PropertyValuesHolder_Delegate.java:143)
at android.animation.PropertyValuesHolder.nCallFloatMethod(PropertyValuesHolder.java)
at android.animation.PropertyValuesHolder.access$400(PropertyValuesHolder.java:38)
at android.animation.PropertyValuesHolder$FloatPropertyValuesHolder.setAnimatedValue(PropertyValuesHolder.java:1387)
at android.animation.ObjectAnimator.animateValue(ObjectAnimator.java:990)
at android.animation.ValueAnimator.animateBasedOnTime(ValueAnimator.java:1339)
at android.animation.ValueAnimator.doAnimationFrame(ValueAnimator.java:1471)
at android.animation.ValueAnimator.pulseAnimationFrame(ValueAnimator.java:1490)
at android.animation.AnimatorSet.pulseFrame(AnimatorSet.java:1163)
at android.animation.AnimatorSet.handleAnimationEvents(AnimatorSet.java:1146)
at android.animation.AnimatorSet.doAnimationFrame(AnimatorSet.java:1046)
at android.animation.AnimationHandler.doAnimationFrame(AnimationHandler.java:146)
at android.animation.AnimationHandler.access$100(AnimationHandler.java:37)
at android.animation.AnimationHandler$1.doFrame(AnimationHandler.java:54)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:947)
at android.view.Choreographer.doCallbacks(Choreographer.java:761)
at android.view.Choreographer_Delegate.doFrame(Choreographer_Delegate.java:66)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.renderAndBuildResult(RenderSessionImpl.java:563)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.render(RenderSessionImpl.java:425)
at com.android.layoutlib.bridge.BridgeRenderSession.render(BridgeRenderSession.java:120)
at com.android.ide.common.rendering.api.RenderSession.render(RenderSession.java:151)
at com.android.ide.common.rendering.api.RenderSession.render(RenderSession.java:133)
at com.android.tools.idea.rendering.RenderTask.lambda$null$8(RenderTask.java:755)
at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1590)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
build.gradle 依赖项
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
//Room dependencies
implementation 'androidx.room:room-runtime:2.1.0'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'com.google.firebase:firebase-core:16.0.4'
implementation 'com.crashlytics.sdk.android:crashlytics:2.10.1'
implementation 'com.google.firebase:firebase-database:16.0.4'
implementation 'com.google.firebase:firebase-storage:16.0.4'
implementation 'com.google.firebase:firebase-auth:16.0.5'
implementation 'com.firebase:firebase-client-android:2.4.0'
annotationProcessor 'androidx.room:room-compiler:2.1.0'
implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0-alpha01'
annotationProcessor "androidx.lifecycle:lifecycle-compiler:2.2.0-alpha01"
//GSON
implementation 'com.google.code.gson:gson:2.8.5'
//UI design
implementation 'com.github.hotchemi:android-rate:1.0.1'
implementation "androidx.legacy:legacy-support-core-utils:1.0.0"
implementation 'com.google.android.material:material:1.1.0-alpha07'
implementation 'androidx.cardview:cardview:1.0.0'
implementation 'androidx.recyclerview:recyclerview:1.1.0-alpha06'
implementation 'com.github.siyamed:android-shape-imageview:0.9.+@aar'
implementation 'com.getkeepsafe.taptargetview:taptargetview:1.12.0'
implementation 'com.romandanylyk:pageindicatorview:1.0.3'
implementation 'com.github.VRGsoftUA:ParallaxView:1.0'
//Glide
implementation 'com.github.bumptech.glide:glide:4.8.0'
annotationProcessor 'com.github.bumptech.glide:compiler:4.8.0'
//Edit image
implementation 'com.yashoid:instacropper:1.0.6'
// FloatingActionButton
implementation 'com.github.martipello:FloatingActionButton:v2.0'
//Navigation
implementation "androidx.navigation:navigation-fragment:2.1.0-alpha05"
// For Kotlin use navigation-fragment-ktx
implementation "androidx.navigation:navigation-ui:2.1.0-alpha05"
//material components
implementation 'androidx.appcompat:appcompat:1.1.0-beta01'
implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha4'
implementation 'androidx.vectordrawable:vectordrawable:1.1.0-beta02'
//tests
testImplementation 'org.json:json:20180130'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.2.0'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
androidTestImplementation 'androidx.test:rules:1.2.0'
androidTestImplementation 'androidx.test.espresso:espresso-contrib:3.2.0'
implementation 'androidx.test.espresso:espresso-idling-resource:3.2.0'
androidTestImplementation 'androidx.test.espresso.idling:idling-concurrent:3.2.0'
androidTestImplementation 'androidx.test.espresso:espresso-intents:3.2.0'
implementation 'org.apache.commons:commons-lang3:3.8.1'
}
【问题讨论】：
-
你能提供你的布局xml吗？
-
你可以得到一些帮助 - stackoverflow.com/a/24523238/5773044
-
尝试刷新你的布局
-
@WilsonSim 是的，我可以，但我可以向你保证，我可以制作一个空的 xml，添加任何布局组、线性、约束等，一切都会好起来的，但我添加的那一刻浮动操作按钮预览停止工作，我还可以添加带有浮动操作按钮的整个布局，布局不会呈现，如果我删除操作按钮，布局预览会重绘并且很好，然后将操作按钮添加回预览保持不变，不再更新
-
@AnupamBose 感谢这有时可能是一个问题，但在这种情况下不是，正如已经提到的，在我添加 ation 按钮之前预览很好
标签： android android-studio preview