1. System Env Variable
    // ANDROID_HOME equal ANDROID_SDK_ROOT
    ANDROID_HOME = E:\SDK_FOLDER
    ANDROID_SDK_ROOT = E:\SDK_FOLDER
    // Add System 
    Path = %ANDROID_SDK_ROOT%\tools;%ANDROID_SDK_ROOT%\platform-tools;

ATTENTION: PROHIBITED Add System Path: %ANDROID_SDK_ROOT%; OR %ANDROID_HOME%;

ELSE, the android build process will prompt ERROR message: "No installed build tools found. Install the Android build tools version 21.1.2 or higher."