Dialogs, or popups, are used when you want to give a message to your users that needs their attention. This ranges from telling the user about some error that occurred or asking them to perform some action before continuing, or even giving them a warning.
As alerts require some feedback from the user, you should use them for important information prompts or for actions that require immediate attention: in other words, only when necessary.
The following are the default alerts for Android and iOS:
In this recipe, we're going to create a platform-aware alert and use it to show a prompt when the user stops the stopwatch.
