Is there anyway to don't go to a place until a rpc is done?

For example, let's say that I have this dummy menu [ Goto Activity Foo | Goto Activity Bar ]

When I click on [ Goto Activity Foo ] I go to the the Foo Activity, and in the start() method I call to a rpc, let's say dummyService.fetchData().

And, then I click on the [ Goto Acitivity Bar ] before that the rpc that the rpc call dummyService.fetchData() finished. Is there anyway to don't go to Bar Activity if the previous rpc is still undone?

Thanks.

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