TextView TextAllCaps导致应用程序崩溃

Question

我遇到了 TextView 的一些奇怪行为。这个堆栈跟踪的其他问题大多与EditText相关，因此我似乎无法找到原因。

以下是我的布局：

<TextView
        android:id="@+id/transaction_card_scan_message_view"
        android:layout_width="0dp"
        android:layout_height="150dp"
        android:elevation="2dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:lines="5"
        android:textColor="@color/transaction_text"
        android:textSize="@dimen/transaction_card_scan_title_textSize"
        android:textAlignment="center"
        android:textAllCaps="true"/>

我遇到了这个错误：

2019-10-21 17:47:32.177 18455-18455/com.iaxept.contactless E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.iaxept.contactless, PID: 18455
java.lang.IndexOutOfBoundsException
    at android.graphics.Paint.getRunAdvance(Paint.java:2986)
    at android.text.TextLine.handleText(TextLine.java:719)
    at android.text.TextLine.handleRun(TextLine.java:873)
    at android.text.TextLine.measureRun(TextLine.java:387)
    at android.text.TextLine.measure(TextLine.java:277)
    at android.text.TextLine.metrics(TextLine.java:251)
    at android.text.Layout.getLineExtent(Layout.java:1094)
    at android.text.Layout.drawText(Layout.java:383)
    at android.widget.Editor.drawHardwareAccelerated(Editor.java:1903)
    at android.widget.Editor.onDraw(Editor.java:1822)
    at android.widget.TextView.onDraw(TextView.java:6691)
    at android.view.View.draw(View.java:18319)
    at android.view.View.updateDisplayListIfDirty(View.java:17297)
    at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3950)
    at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3930)
    at android.view.View.updateDisplayListIfDirty(View.java:17260)
    at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3950)
    at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3930)
    at android.view.View.updateDisplayListIfDirty(View.java:17260)
    at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3950)
    at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3930)
    at android.view.View.updateDisplayListIfDirty(View.java:17260)
    at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3950)
    at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3930)
    at android.view.View.updateDisplayListIfDirty(View.java:17260)
    at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3950)
    at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3930)
    at android.view.View.updateDisplayListIfDirty(View.java:17260)
    at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3950)
    at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3930)
    at android.view.View.updateDisplayListIfDirty(View.java:17260)
    at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3950)
    at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3930)
    at android.view.View.updateDisplayListIfDirty(View.java:17260)
    at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3950)
    at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3930)
    at android.view.View.updateDisplayListIfDirty(View.java:17260)
    at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:666)
    at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:672)
    at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:780)
    at android.view.ViewRootImpl.draw(ViewRootImpl.java:3112)
    at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2908)
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2502)
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1509)
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7051)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:927)
    at android.view.Choreographer.doCallbacks(Choreographer.java:702)
    at android.view.Choreographer.doFrame(Choreographer.java:638)
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:913)
    at android.os.Handler.handleCallback(Handler.java:751)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6692)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)

我尝试过使用messageView.setTransformationMethod(new AllCapsTransformationMethod(getParentActivity()))，但没有用。很奇怪的是，当文本混合大小写时它可以正常工作，而且堆栈跟踪并不十分有用。

- Charlie Niekirk

---

不知道这是否是明智之举，但作为一种解决方法，您可以检查文本，看它是否包含大小写字母，然后再调用您的函数。 - TDG

谢谢您的建议，但是您指的是哪个函数？ - Charlie Niekirk

你所说的那个可以处理大小写混合的字母组合。 - TDG

抱歉，也许我没有表达清楚。TextView在没有使用"textAllCaps"时正常工作，但使用它时却不正常。我尝试的函数没有起作用。 - Charlie Niekirk

Answer 1

我认为这是一个 Android 操作系统的 bug。当我在所有的 setText() 或 append() 调用中使用 toUpperCase() 时，就不会崩溃，因此可以作为临时解决方案。然而，android:textAllCaps="true" 的问题仍然存在，需要修复。

- Charlie Niekirk