写布局时出现以下错误：
Caused by: android.view.InflateException: Binary XML file line #94 in com.bottomnavigation:layout/activity_main: Binary XML file line #94 in com.bottomnavigation:layout/activity_main: Error inflating class null
Caused by: android.view.InflateException: Binary XML file line #94 in com.bottomnavigation:layout/activity_main: Error inflating class null
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
找到了原因：（是xml文件中View应该为大写，写成小写了），汗颜，特此记录一下，避免下次出现在这种错误。
错误日志：
