IMPORTANT: In July 2025, we stopped releasing new versions of KTX modules, and we removed the KTX libraries from the Firebase Android BoM (v34.0.0). If you use KTX APIs from the previously released KTX modules, we recommend that you migrate your app to use KTX APIs from the main modules instead. For details, see the FAQ about this initiative.
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PropertyName
@Retention(value = RetentionPolicy.RUNTIME) @Target(value = [ElementType.METHOD, ElementType.FIELD]) public annotation PropertyName
Marks a field to be renamed when serialized.
Kotlin Note
When applying this annotation to a property of a Kotlin class, both the @get and @set use-site targets should be used.
Here is an example of a class that can both be written into and read from Firestore whose foo property will be stored into and read from a field named my_foo in the Firestore document:
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-21 UTC."],[],[]]