public Builder checkAndUnpackFile(String nameInApk,String destFileName){
  unpackers.add(new ContentCheckingUnpacker(nameInApk,destFileName));
  return this;
}

public Builder checkAndUnpackFile ( String nameInApk , String destFileName ) { unpackers . add ( new ContentCheckingUnpacker ( nameInApk , destFileName ) ) ; return this ; }
adds a file for unpacking . content of extracted file is compared on each start with content of the same file bundled in apk . it is usefull for detecting bundle / app changes .
