Intent Resolution confusion

fungi8210 · March 9th, 2010, 11:38 PM

Page 146 "How Android Resolves Intent Filters"
The text states

Quote:

2.1. "Action matches are made if the Intent Filter either includes the specified action or has no action specified"

on Android developer guide
http://developer.android.com/intl/zh...s-filters.html

the rule follows

Quote:

To pass this test, the action specified in the Intent object must match one of the actions listed in the filter. If the object or the filter does not specify an action, the results are as follows:

•If the filter fails to list any actions, there is nothing for an intent to match, so all intents fail the test. No intents can get through the filter.
•On the other hand, an Intent object that doesn't specify an action automatically passes the test — as long as the filter contains at least one action.

Therefore I think the text got mixed up between the rules applied for Intent and Intent Filters.

I think changing the text to
"Action matches are made if the Intent Filter either includes the specified action or has no action specified for Intent object"
would make more sense.

Please correct my understanding if I misunderstood any of the contents.

thanks

Reto · March 10th, 2010, 06:50 AM

Yes - your understanding is correct.

Intents will resolve to any Intent Filter that includes an action tag that matches the specified Intent action, or if an Intent has no action specified it will match an Intent Filter that has at least one action tag.

fungi8210 · March 10th, 2010, 07:15 AM

Thanks!
Im just a little surprised how this error can sneak through first edition and onto the second edition. But then again, it might be sdk version differences.

Reto · March 10th, 2010, 07:18 AM

I have a feeling this behavior was different back in the early days. I can't find anything definitive though so I'll not blame that :)