最近使用kotlin结合zxing开发，发现有些问题：
如果返回一个null值，在onActivityResult里面会报Parameter specified as non-null is null for data的错误。这个问题在java里并不会出现。原因在于kotlin有非空检查。如果直接使用onActivityResult的java源码转成kotlin的话，会发现
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {}
data:Intent那里少了一个问号，只要加上？就可以了。
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