Java related setup, class path, wherejava, different version and paths

JNI:

    Java: MainActivity call C function

    C funciton keep a VM reference and method references. 

    JNI function in C will find env from the ref. and call functions from method ref.

UI thread, only main thread can manipulate the UI stuff, window, pop up stuff

String Runtime error,

R.java not exist, edited build file, add a section that calls aapt to gen strings files accordingly

Compile fb sdk. Not all sdk come with a precompiled jar. Certain elements need to be generated based on local settings/configs

Android SDK

    Different APK level and supported features, google play profile API 19

    Adding Interact_cross_user_full to manifest is not an option. There is error elsewhere.

    Directory structure changed for tools

    script/initialize.xml, gcc version

Android dev issues