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Android allows you to cancel most dialogs by closing them with the back button, but many of the dialogs in the OS still have a dedicated Cancel button. Example:

Is it always appropriate to have such a button? It looks fine to me, but one could argue that it is a bit redundant and clutters space if a dialog has three buttons (cancel, action #1, action #2).

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I think this depends on the context but if the OS is using it then you can use it as well and it's consistent.

Here there is a similar thread (cancel button in web forms)

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