Printing Cross Compiled libraries(C/C++) Log (printf) in Android (Logcat)

[Rao Saifullah]

I cross compiled some C/C++ static libraries using Netbeans for android (arm-linux-androideabi). Those libraries have log information, which i want to see while the application run on the phone (adb mode). is there any way, that those log information present in C/C++ cross compiled static libs can be displayed on logcat or anywhere else in Android studio. The log information in static libraries are just information printing using printf.

[Andrew Esh]

Enable stdio Redirection

1. adb remount
2. adb shell
3. cd system
4. vi build.prop
5. Add "log.redirect-stdio=true" as a new line at the bottom of the file.
6. exit
7. adb reboot
8. Now stdout and stderr will be logged to logcat.

You might not have vi if you haven't installed BusyBox in your device. In that case use adb pull and adb push to update the build.prop file.

[Rao Saifullah]

Dear Andrew, thanks for the answer. i already read about this method but isn't this method is specifically for the System.out and System.err. As per android website. 

By default, the Android system sends stdout and stderr (System.out and System.err) output to /dev/null. 

Can i use the same for printf or cout also from the static cross compiled native libraries.\? 

[Martin Sternevald]

You could try redirecting printf output to your own function using <linker> -wrap

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