java.lang.NullPointerException: Attempt to invoke virtual method ‘void android.widget.ImageView.setImageResource(int)’ on a null object reference
今天在家练习ListView的时候，遇到一个java.lang.NullPointerException的空指针异常，log如下：
2020-05-10 15:40:29.249 20436-20436/? E/k.myapplicatio: Unknown bits set in runtime_flag
