When I got something like this
ERROR/AndroidRuntime(18677): Caused by: java.lang.NullPointerException
ERROR/AndroidRuntime(18677): at com.companyname.a.a.a(Unknown Source)
How can I know where the problem is and debug this issue? I only got the mapping output from ProGuard and don't know the line number. Thanks.
To retrace back obfuscated ProGuard file do the following steps:
You need to install Proguard.
Proguard provides you with a UI mode which is great tool to retrace.
Open up the proguardgui.sh which you find it in MAC machine
/Users/{name}/Library/Android/sdk/tools/proguard/bin/proguardgui.sh
You can run it through the terminal.
Here's a link to official documentation on retrace tool from Android SDK: https://developer.android.com/studio/build/shrink-code#decode-stack-trace
This article is good too: https://medium.com/@maheshwar.ligade/de-obfuscate-stack-traces-6e19a52a3379
For all you copy-paste bros:
retrace.bat|retrace.sh [-verbose] mapping.txt [<stacktrace_file>]