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An arbitrary object to send to the recipient. When using Android.OS.Messenger to send the message across processes this can only be non-null if it contains a Parcelable of a framework class (not one implemented by the application). For other data transfer use Message.Data.
Note that Parcelable objects here are not supported prior to the NoType:android/os/Build$VERSION_CODES;Href=../../../reference/android/os/Build.VERSION_CODES.html#FROYO release.