That code does not remove the 0th Message.


It removes all messages that have a "what" value of 0.  


The "what" is apparently an id associated with the messages (not 
necessarily unique) :

<https://lh4.googleusercontent.com/-NFUf7VOHEOU/UWgawLxDSKI/AAAAAAAAAW0/8AjbjmNtl_Y/s1600/what.png>



Thanks.



On Thursday, April 11, 2013 8:20:06 PM UTC-5, NoraBora wrote:
>
> Sometimes you use a handler as a member variable and use it for 
> sendMessages(), removeMessage(), post().
> I just found out something.
>
> Say you call these
>     handler.sendMesssage(0) // 1 
>     handler.post(new Runnable()) // 2
>     handler.post(new Runnable()) // 3 
>
> and call this
>     handler.removeMessage(0)
>
> then this will remove 2, 3 as well as 1
> because removeMessage/hasMessage doesn't check runnable and posted 
> message's what value is 0 by default.
>
> Some people could think this as a bug but it's too late to change such a 
> basic api so
> I think documentation should mention this.
>

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