( Android ) 나를 호출한 Activity Class name 얻기

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getCallingActivity() 

if(getCallingActivity().getClassName().equals(MainActivity.class.getName())) {
    /** Called From Main Activity */
} else {
    /** Called From Other Activities */
}

* 주의사항 *

startActivityForResult(..) 로 호출한 곳에서는 null 리턴될것임..

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