Android data binding nested ternary on expression

Question

In android's data binding syntax is there anyway to do a nested ternary on the result of an expression without calculating the expression twice:

For the single ternary case I have the following:

android:textColor="@{stock.mStockDelta.compareTo(BigDecimal.ZERO) < 0 ?
                   @color/red : @color/green}"

I'm wondering if there's a way I can set the color for each one of three compareTo results {-1, 0, 1} just using the xml?

Answer 1

Possible duplicate ( Switch case in Data Binding )

For the advanced logic in the data binding, you should put your own logic into the method and call it in the xml

android:textColor="@{stock.mStockDelta.getColor}"

Do your own logic in the getColor method instead of put a lot of condition in the xml. You should remain your xml fully-readable. Leave the logic flow for the java class.

 android:textColor="@{stock.mStockDelta.getColor > 2 ?( stock.mStockDelta.getColor ==3 ? @color/green :@color/colorPrimary): @color/colorAccent }"

Answer 2

you can try this

android:textColor="@{stock.mStockDelta.compareTo(BigDecimal.ZERO) < 0 ?
               @color/red : (stock.mStockDelta.compareTo(BigDecimal.ZERO) > 0 ? @color/green : @color/blue)}"

But this is not recommended, you should put this logic in view model as George Mount suggested in this comment