布局预览中的 TextClock 渲染问题 [英] TextClock render problem in layout preview

问题描述

当我在布局中创建 TextClock 小部件时，Android Studio 布局预览显示并没有显示更改.但在调试设计小部件工作完美.如果我评论它布局预览工作成功.另一台 PC Android Studio 工作成功并显示 TextClock.

When i created TextClock widget in layout Android Studio layout preview cahsed and didn't show the changes. But on debug devise widget work perfectly. If I commented it layout preview work successfuly. Another PC Android Studio work successfuly and show TextClock.

错误布局预览

java.lang.NullPointerException
at android.content.ContentResolver.registerContentObserver(ContentResolver.java:2263)
at android.widget.TextClock.registerObserver(TextClock.java:626)
at android.widget.TextClock.onAttachedToWindow(TextClock.java:545)
at android.view.View.dispatchAttachedToWindow(View.java:19575)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.AttachInfo_Accessor.setAttachInfo(AttachInfo_Accessor.java:44)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:355)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:404)
at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:141)
at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:657)
at com.android.tools.idea.rendering.RenderTask.lambda$inflate$7(RenderTask.java:788)
at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1590)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

TextClock XML 代码

TextClock XML code

<TextClock
            android:layout_width="120dp"
            android:layout_height="35dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:layout_marginEnd="16dp"
            android:format24Hour="dd.MMMyyyy, HH:mm"
            android:format12Hour="dd.MMM.yyyy, hh:mm a"
            android:textColor="#d0ffffff"
            android:textSize="30sp" />

将 minSdkVersion 更改为 17 并创建布局 v17 没有给出任何结果.在 Android Studio 3.6、3.6.1 和 4.0 中发现的问题

Changing minSdkVersion to 17 and creating layout v17 didn't give any results. Problem found in Android Studio 3.6, 3.6.1 and 4.0

推荐答案

注释您的 TextClock 并刷新您的预览，然后取消注释您的 TextClock.这将解决您的问题.

Comment your TextClock and refresh your preview, and then uncomment your TextClock. This will fix your issue.

我升级到AS 3.6.1时遇到了这个问题

I encountered this problem when I upgraded to AS 3.6.1

这篇关于布局预览中的 TextClock 渲染问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！