您如何解读模糊的Android崩溃报告? [英] How do you interpret a deobfuscated Android crash report?

问题描述

我从应用程序的Google Play管理区域下载了崩溃报告，并通过retrace.sh运行了该报告以对Proguard映射进行模糊处理，并在下面生成了输出.

I downloaded a crash report from my app's Google Play admin area, ran it through retrace.sh to deobfuscate the Proguard mapping, and it produced the output below.

问题:

什么是未知来源?

showHeader，showPhoto等确实是我的SummaryFragment类中的方法，但是为什么按所示顺序列出它们呢?这些方法在我的代码中不遵循任何逻辑或执行顺序.

showHeader, showPhoto, etc. are indeed methods in my SummaryFragment class, but why are they listed in the order shown? These methods do not follow any sort of logical or execution order in my code.

NPE实际使用哪种方法?

In which method was the NPE actually thrown?

Caused by: java.lang.NullPointerException
at com.myapp.SummaryFragment.selectMenuItemAuth(Unknown Source)
                                             showHeader
                                             photoButtonClicked
                                             showPhoto
                                             nameButtonClicked
                                             deleteByID
                                             access$0
at com.myapp.SummaryFragment.onActivityCreated(Unknown Source)
at android.support.v4.app.Fragment.performActivityCreated(Unknown Source)
at android.support.v4.app.FragmentManagerImpl.moveToState(Unknown Source)
                                              moveToState
                                              moveToState
                                              moveToState

推荐答案

ProGuard已从混淆后的应用程序中删除了可选属性SourceFile和LineNumberTable.结果，堆栈跟踪没有行号，从而造成了一些歧义. ReTrace会为堆栈跟踪的每一行打印出可能的替代项列表.

ProGuard has removed the optional attributes SourceFile and LineNumberTable from the obfuscated application. As a result, the stack traces don't have line numbers, causing some ambiguity. ReTrace prints out a list of possible alternatives for each line of the stack trace.

通过在proguard-project.txt中添加以下行，可以获得更易于解释的堆栈跟踪:

You can get stack traces that are easier to interpret by adding the following lines to your proguard-project.txt:

-renamesourcefileattribute MyApplication
-keepattributes SourceFile,LineNumberTable

请参阅ProGuard手册> ReTrace> 用法.

See the ProGuard manual > ReTrace > Usage.

请参阅ProGuard手册>示例> 生成有用的堆栈跟踪

See the ProGuard manual > Examples > Producing useful stack traces

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