android – 约束 – 布局lib更新从1.0.2到1.1.0出错(Guideline.getAnchor)

概述我目前使用以下lib的约束布局 实现’com.android.support.constraint：constraint-layout：1.0.2′ 通过android studio中的更新警告,我将此更新为 实现’com.android.support.constraint：constraint-layout：1.1.0′ 之后,每当我尝试构建或运行项目时,我都会遇到以下问题(请参阅堆栈跟踪) 我目前使用以下lib的约束布局

实现’com.android.support.constraint：constraint-layout：1.0.2′

通过androID studio中的更新警告,我将此更新为

实现’com.androID.support.constraint：constraint-layout：1.1.0′

之后,每当我尝试构建或运行项目时,我都会遇到以下问题(请参阅堆栈跟踪)

java.lang.AssertionError: top    at androID.support.constraint.solver.Widgets.GuIDeline.getAnchor(GuIDeline.java:159)    at androID.support.constraint.solver.Widgets.ConstraintWidget.immediateConnect(ConstraintWidget.java:1579)    at androID.support.constraint.ConstraintLayout.setChildrenConstraints(ConstraintLayout.java:1012)    at androID.support.constraint.ConstraintLayout.updateHIErarchy(ConstraintLayout.java:793)    at androID.support.constraint.ConstraintLayout.onMeasure(ConstraintLayout.java:1540)    at androID.vIEw.VIEw.measure(VIEw.java:18804)    at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:5954)    at androID.Widget.FrameLayout.onMeasure(FrameLayout.java:194)    at androID.vIEw.VIEw.measure(VIEw.java:18804)    at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:5954)    at androID.Widget.linearLayout.measureChildBeforeLayout(linearLayout.java:1465)    at androID.Widget.linearLayout.measureVertical(linearLayout.java:748)    at androID.Widget.linearLayout.onMeasure(linearLayout.java:630)    at androID.vIEw.VIEw.measure(VIEw.java:18804)    at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:5954)    at androID.Widget.FrameLayout.onMeasure(FrameLayout.java:194)    at com.androID.internal.policy.PhoneWindow$DecorVIEw.onMeasure(PhoneWindow.java:2643)    at androID.vIEw.VIEw.measure(VIEw.java:18804)    at androID.vIEw.VIEwRootImpl.performMeasure(VIEwRootImpl.java:2112)    at androID.vIEw.VIEwRootImpl.measureHIErarchy(VIEwRootImpl.java:1228)    at androID.vIEw.VIEwRootImpl.performTraversals(VIEwRootImpl.java:1464)    at androID.vIEw.VIEwRootImpl.doTraversal(VIEwRootImpl.java:1119)    at androID.vIEw.VIEwRootImpl$TraversalRunnable.run(VIEwRootImpl.java:6060)    at androID.vIEw.Choreographer$CallbackRecord.run(Choreographer.java:858)    at androID.vIEw.Choreographer.doCallbacks(Choreographer.java:670)    at androID.vIEw.Choreographer.doFrame(Choreographer.java:606)    at androID.vIEw.Choreographer$FramedisplayEventReceiver.run(Choreographer.java:844)    at androID.os.Handler.handleCallback(Handler.java:746)    at androID.os.Handler.dispatchMessage(Handler.java:95)    at androID.os.Looper.loop(Looper.java:148)    at androID.app.ActivityThread.main(ActivityThread.java:5443)    at java.lang.reflect.Method.invoke(Native Method)    at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)    at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:618)

也遇到了崩溃问题,

E/Crashlyticscore: Failed to execute task.java.util.concurrent.TimeoutException    at java.util.concurrent.FutureTask.get(FutureTask.java:177)    at com.crashlytics.androID.core.CrashlyticsBackgrounDWorker.submitAnDWait(CrashlyticsBackgrounDWorker.java:41)    at com.crashlytics.androID.core.CrashlyticsController.handleUncaughtException(CrashlyticsController.java:320)    at com.crashlytics.androID.core.CrashlyticsController.onUncaughtException(CrashlyticsController.java:300)    at com.crashlytics.androID.core.CrashlyticsUncaughtExceptionHandler.uncaughtException(CrashlyticsUncaughtExceptionHandler.java:42)    at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:693)    at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:690)

如果我恢复到1.0.2版本工作正常.这是一个被注意到的错误吗？如何解决这个问题？

解决方法 我们遇到了同样的问题,问题是新版本添加了一些额外的断言,因此旧代码可能会停止工作,因为约束布局的工作方式,堆栈跟踪根本不直观.

public ConstraintAnchor getAnchor(Type anchorType) {    switch(anchorType) {    case left:    case RIGHT:        if (this.mOrIEntation == 1) {            return this.mAnchor;        }        break;    case top:    case BottOM:        if (this.mOrIEntation == 0) {            return this.mAnchor;        }        break;    case BASEliNE:    case CENTER:    case CENTER_X:    case CENTER_Y:    case NONE:        return null;    }    throw new AssertionError(anchorType.name());}

这是导致异常的方法.检查的是,如果指南是垂直指南,任何为其添加约束的项目都应该横向(开始或结束),反之则为垂直指南.

在我们的例子中,我们使用了布局

app:layout_constrainttop_toBottomOf="@+ID/guIDeline"app:layout_constraintStart_toStartOf="@+ID/guIDeline"

检查您的布局,并确保在指南中添加适当的约束.

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