Do-not-forget proguard settings

http://proguard.sourceforge.net/manual/examples.html#stacktrace:

-renamesourcefileattribute SourceFile
-keepattributes SourceFile,LineNumberTable

proguard - retrace obfuscated stacktraces

\android-sdk-windows\tools\proguard\bin\proguardgui.bat
Choose 'ReTrace' tab.
- Mapping file: \proguard\1.0\mapping.txt
- Obfuscated stack trace:
- click 'Retrace!'