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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