Android: Why data binding not forcing NullPointerException even if object is null

Question

I am not sure why data binding not allowing crash even if the object is null, Some time it's not okay to avoid null pointer exceptions, as a result user might see empty data or get confused by seeing empty TextFild.

Eg:

android:text="@{user.lastName}"

If above user object is null, then we will see empty textView, where user can think they don't have the last name in database/network server.

Is there any parameter where we can force NullPointerException if the object is null?

Answer 1

您可以在var的getter方法中检查nullPointerException以获取变量，甚至可以在像波纹管这样的数据绑定集文本中设置null条件

android:text="@{user.lastName != null ? user.lastName : "unknown text" }"