代码混淆后日志的解读工具-retrace

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Android开发应该都知道代码混淆工具Proguard的使用来保护app源码在被反编译后不会被轻易地解读但这样也会导致我们自身收集到的诸如Crash等stacktrace的信息变得难以读懂,好在有补救的措施,这里就介绍一个工具-retrace,用来将混淆后的stacktrace还原成混淆之前的信息.

Android SDK默认带着retrace脚本,一般情况下路径为

./tools/proguard/bin/retrace.bat

Proguard进行混淆之后,会生成一个映射表,文件名为mapping.txt

下面来看：

E/AndroidRuntime(24006): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object referenceE/AndroidRuntime(24006):    at com.example.admin.proguardsample.a.a(Utils.java:10)E/AndroidRuntime(24006):    at com.example.admin.proguardsample.MainActivity.onCreate(MainActivity.java:22)E/AndroidRuntime(24006):    at android.app.Activity.performCreate(Activity.java:6106)E/AndroidRuntime(24006):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)E/AndroidRuntime(24006):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2566)E/AndroidRuntime(24006):    ... 10 more

对上面的信息处理,去掉E/AndroidRuntime(24006):这些字符串retrace才能正常工作.得到的字符串是

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object referenceat com.example.admin.proguardsample.a.a(Utils.java:10)at com.example.admin.proguardsample.MainActivity.onCreate(MainActivity.java:22)at android.app.Activity.performCreate(Activity.java:6106)at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2566)... 10 more

将上面的stacktrace保存成一个文本文件,比如名称为tm_stacktrace.txt

./tools/proguard/bin/retrace.bat/Users/admin/Downloads/ProguardSample/app/build/outputs/mapping/release/mapping.txt/tmp/tm_stacktrace.txt

得到的易读的stacktrace是

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object referenceat com.example.admin.proguardsample.Utils.int getBitmapWidth(android.graphics.Bitmap)(Utils.java:10)at com.example.admin.proguardsample.MainActivity.void onCreate(android.os.Bundle)(MainActivity.java:22)at android.app.Activity.performCreate(Activity.java:6106)at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2566)... 10 more

为了更加容易和高效分析stacktrace,建议保留SourceFile和LineNumber属性

-keepattributesSourceFile,LineNumberTable

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