Android Message Queue Per Thread or Per Handler

Question

I am writing my handlers in two different activities which are running on the same UI thread. Now the question is if I post a message using these two different handlers, would it end up in the same message queue associated with the main thread or each handler has a separate message queue associated with it.

Any pointers will be appreciated.

lykhonis · Accepted Answer · 2012-03-26 18:13:06Z

1

You should look at this Handler

answered Mar 26, 2012 at 18:13

lykhonis

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2 Comments

cppdev Over a year ago

Thanks. MessageQueue is associated with the thread. But what happends in case of multiple handlers. So if I post a message on one handler, then will the handleMessage of both the handlers will be called ?

lykhonis Over a year ago

Hm :) interesting, I think yes but I'd write a simple app and try it, I think it's the best way to figure it out. UPD: I suppose it implements observer pattern, may be I'm wrong, if so it will notify each handler about message.

Dheeraj Vepakomma · Accepted Answer · 2012-03-26 18:25:15Z

1

Each Handler is associated with a Looper. A Looper is in turn associated with a Thread.

So if you have a single thread, you'll have a single message queue.

Check this link for a nice introduction to Loopers & Handlers.

answered Mar 26, 2012 at 18:25

Dheeraj Vepakomma

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