ConstraintLayout在蓝图模式外无法正确呈现 [英] ConstraintLayout does not render correctly outside blueprint mode

问题描述

我今天开始使用Android Studio 2.2和ConstraintLayout，但是在渲染方面遇到了一些问题.使用蓝图模式"时，一切看起来都很好.使用设计模式"时，对象被粘贴在左上角，并全部粘贴在一起.

I started using Android Studio 2.2 and ConstraintLayout today, but I'm having some issues with the rendering. When using Blueprint Mode everything appears fine. When using Design Mode, the objects are stuck at the top left corner all mashed together.

Android Studio警告:onMeasure错误

Android Studio warning: onMeasure error

java.lang.NoSuchMethodError: android.support.constraint.solver.widgets.ConstraintWidget.immediateConnect(Landroid/support/constraint/solver/widgets/ConstraintAnchor$Type;Landroid/support/constraint/solver/widgets/ConstraintWidget;Landroid/support/constraint/solver/widgets/ConstraintAnchor$Type;II)V
    at android.support.constraint.ConstraintLayout.setChildrenConstraints(ConstraintLayout.java:517)
    at android.support.constraint.ConstraintLayout.updateHierarchy(ConstraintLayout.java:433)
    at android.support.constraint.ConstraintLayout.onMeasure_Original(ConstraintLayout.java:728)
    at android.support.constraint.ConstraintLayout.onMeasure(ConstraintLayout.java)
    at android.view.View.measure(View.java:19731)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
    at android.view.View.measure(View.java:19731)
    at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
    at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
    at android.view.View.measure(View.java:19731)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.measureView(RenderSessionImpl.java:545)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:342)
    at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:429)
    at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:389)
    at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:548)
    at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:533)
    at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:966)
    at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:533)
    at com.android.tools.idea.rendering.RenderTask.lambda$inflate$72(RenderTask.java:659)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

依赖项:

compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha8'

这是Android Studio中无法解决的错误，还是可以解决的问题? SDK已更新.

Is this an unsolvable error in Android Studio or is there something that is solvable? SDK is updated.

编辑

XML文件:

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.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:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:src="@drawable/about"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView6"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginLeft="16dp" />

    <TextView
        android:text="TextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textView33"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toRightOf="@+id/imageView6"
        android:layout_marginLeft="16dp" />

    <TextView
        android:text="TextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textView34"
        app:layout_constraintRight_toRightOf="@+id/textView33"
        android:layout_marginTop="8dp"
        app:layout_constraintTop_toBottomOf="@+id/textView33" />
</android.support.constraint.ConstraintLayout>

推荐答案

如此处所述 约束布局Alpha8发行说明

注意:由于API的更改，您可能必须升级到alpha 8后才能重新启动Android Studio 2.2，以使布局预览正常工作.

Note: due to API change, you might have to restart Android Studio 2.2 after upgrading to alpha 8 for layout preview to work.

因此从菜单栏中选择file并选择invalidate caches / restart

so From the menu bar, select file and choose invalidate caches / restart

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