I am using crashlytics in my project, I integrate crashlytics by eclipse and export apk by eclipse, crashlytics works fine. But when I build project by console (cocos run -p android), apk build done but not integrate crashlytics. How to build APK integrate Crashlytics by console, thank all.
Most probably you have not added jar files in console build, whe I’m used eclipse I added them to build.xml. If u using cocos 3.7+ forget eclipse and start using android-studio project - it is much much more easier to do such stuff.
I am using cocos 3.10, i create a new project with precompile option and it only create eclipse project and no create android studio project. If I create a new project with source code option, it will both eclipse project and android studio project but I don’t like this option because time build of project is too long 
Depends, if you developing game alone, then you need to compile only once and then do only incremental compile in most cases.
Yes, pre-compiled libs are cool, but Eclipse is so bad that we choosing android studio 
instead.