Data binding: set property if it isn't null
Well data binding avoids NullPointerException in general by checking for it and assigns the default value (null for example) even if item
itself is null in your example.
But a basic example for null checks for the item's properties:
android:text='@{item.title != null ? user.title : ""}'
Or use the "Null Coalescing Operator". The null coalescing operator (??
) chooses the left operand if it is not null or the right if it is null.
android:text='@{item.title ?? ""}'
Note that title
or getTitle
doesn't matter.
Data binding does not need to check for null value, it will be handled by binding class.
If you need to check null for other purpose (like setting default value) then you can use like this.
android:text='@{item.gender != null ? item.gender : @string/male}'
or
android:text='@{item.gender ?? @string/male}'
Both above examples are same. Here @string/male
is default value, when item.gender
is null
.