1. Try to avoid Serializable. It is very slow compared to Parcelable. 2. Take a look at startActivityForResult and onActivityResult. 3. If you reeeaaally need to update activity A about events from activity B, consider putting your own subclass of ResultReceiver in the Intent's 'extras'. Then activity B can call 'send(...)' on that ResultReceiver and this will be received in activity A as an 'onReceiveResult(...)' call-back.
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