“错误:无法生成视图绑定器 java.lang.NullPointerException"的可能原因 [英] Possible reason for "Error:cannot generate view binders java.lang.NullPointerException"

问题描述

我将 Android Studio 用于我的 Android 项目.当构建因奇怪的堆栈跟踪而崩溃时，我遇到了一个问题，如下所示:

错误:任务:app:compileDevDebugJavaWithJavac"的执行失败.java.lang.RuntimeException: 失败，详情请查看日志.无法生成视图绑定器 java.lang.NullPointerException在 android.databinding.tool.reflection.ModelMethod.isBoxingConversion(ModelMethod.java:155)在 android.databinding.tool.store.SetterStore.isBetterParameter(SetterStore.java:946)在 android.databinding.tool.store.SetterStore.getBestSetter(SetterStore.java:838)

似乎数据绑定整体上被破坏了.

我之前进行了重构并在包之间移动了类.

解决方案

就我而言，在包之间重命名和移动类时，我依赖于 Android Studio.但它没有对布局的 XML 进行更正，其中在 data 中的 variable 元素的 type 属性中引用了重构类.

所以我之前的类型的值指向不存在的文件并且构建崩溃了.

这是一个简单的错误，但可能需要更多时间才能找到来源.希望这会对某人有所帮助.

I am using Android Studio for my Android projects. I faced an issue when builds crash with strange stacktrace, like this:

Error:Execution failed for task ':app:compileDevDebugJavaWithJavac'.
 java.lang.RuntimeException: failure, see logs for details.
  cannot generate view binders java.lang.NullPointerException
    at android.databinding.tool.reflection.ModelMethod.isBoxingConversion(ModelMethod.java:155)
    at android.databinding.tool.store.SetterStore.isBetterParameter(SetterStore.java:946)
    at android.databinding.tool.store.SetterStore.getBestSetter(SetterStore.java:838)

and it was seemed that the databinding became broken as whole.

I made refactoring before and moved classes between packages.

解决方案

In my case, I relied on Android Studio when renaming and moving classes between packages. But it didn't proceed correction for XMLs of layouts where were references on refactored classes in the type attribute of variable element in data.

So my previous type's value pointed to non existing files and build crashed.

It's simple mistake but it may take more time to find the source. Hope this would help someone.

这篇关于“错误:无法生成视图绑定器 java.lang.NullPointerException"的可能原因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！