FAQ-0244 Can I set up a callback from native code to Java code?


FAQ-0244 Can I set up a callback from native code to Java code?

» Symbian OS » Developer Knowledgebase » FAQ-0244

Classification:	Java	Category:	JNI
Created:	07/01/99	Modified:	09/11/2002
Number:	FAQ-0244
Platform:	Not Applicable

Question:
Can I set up a callback from my Java code to notify my Java app whenever an event of interest occurs in native code?

Answer:
If the event is a system event (such as those delivered by RChangeNotifier), then yes you can do this by spawning a daemon thread from the Java side. This thread can then report back with a Java event whenever the native event it is listening for occurs. An example of this is provided in the ELocale example project downloadable from the Symbian Developer Network Web site. If you want to listen for more than one type of native event, that should also be possible with the use of Active Objects.