提供帮助信息时,TextVew会抛出异常

Question

当从Assistance请求时,TextView会抛出NullPointerException.有什么想法有什么不对吗？

我甚至不知道在崩溃时屏幕上到底是什么.

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 
'android.graphics.Rect android.graphics.drawable.Drawable.getBounds()' on a null 
object reference
   at android.text.style.DynamicDrawableSpan.getSize(DynamicDrawableSpan.java:78)
   at android.text.MeasuredText.addStyleRun(MeasuredText.java:284)
   at android.text.StaticLayout.generate(StaticLayout.java:744)
   at android.text.DynamicLayout.reflow(DynamicLayout.java:300)
   at android.text.DynamicLayout.<init>(DynamicLayout.java:175)
   at android.widget.TextView.makeSingleLayout(TextView.java:8043)
   at android.widget.TextView.makeNewLayout(TextView.java:7886)
   at android.widget.TextView.assumeLayout(TextView.java:7785)
   at android.widget.TextView.onProvideStructure(TextView.java:10536)
   at android.view.View.dispatchProvideStructure(View.java:7382)
   at android.view.ViewGroup.dispatchProvideStructure(ViewGroup.java:3276)
   at android.view.ViewGroup.dispatchProvideStructure(ViewGroup.java:3276)
   at android.view.ViewGroup.dispatchProvideStructure(ViewGroup.java:3276)
   at android.view.ViewGroup.dispatchProvideStructure(ViewGroup.java:3276)
   at android.view.ViewGroup.dispatchProvideStructure(ViewGroup.java:3276)
   at android.view.ViewGroup.dispatchProvideStructure(ViewGroup.java:3276)
   at android.view.ViewGroup.dispatchProvideStructure(ViewGroup.java:3276)
   at android.view.ViewGroup.dispatchProvideStructure(ViewGroup.java:3276)
   at android.view.ViewGroup.dispatchProvideStructure(ViewGroup.java:3276)
   at android.view.ViewGroup.dispatchProvideStructure(ViewGroup.java:3276)
   at android.view.ViewGroup.dispatchProvideStructure(ViewGroup.java:3276)
   at android.view.ViewGroup.dispatchProvideStructure(ViewGroup.java:3276)
   at android.view.ViewGroup.dispatchProvideStructure(ViewGroup.java:3276)
   at android.app.assist.AssistStructure$WindowNode.<init>(AssistStructure.java:422)
   at android.app.assist.AssistStructure.<init>(AssistStructure.java:1335)
   at android.app.ActivityThread.handleRequestAssistContextExtras(ActivityThread.java:3110)
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1834)
   at android.os.Handler.dispatchMessage(Handler.java:102)
   at android.os.Looper.loop(Looper.java:154)
   at android.app.ActivityThread.main(ActivityThread.java:6682)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)

Answer 1

我在以下情况下有完全相同的错误:

• 有一个提示集的textview
• 在加载屏幕时(或者如果它没有接收到自动对焦时点击它),它会获得初始焦点
• 在Android O(8.0.0)下.

有一个新的操作系统功能可以自动预填充(并保存)凭据,对于我的情况,当电子邮件地址的文本视图聚焦时,当操作系统尝试显示弹出列表可用选项时,应用程序崩溃.

我现在的解决方法是:

• android:hint="...."从XML布局中删除,或
• 添加android:importantForAutofill="no"以关闭自动填充

到目前为止,这个错误在以前的Android版本中是不可重现的,因此我猜测这应该是一个操作系统错误.