Page return and app exit logic - Android

[cuihantao]

Hi there,

Thank you for developing this awesome open-source project to create mobile apps for Wordpress sites.

I tested yesterday on my Android Phone. There is one operation logic that might not follow most users' habits. While in the "Settings" page, if the user taps the "Return" softkey, the app is supposed to close the settings and return to where it was. The current version in the develop branch simply closes the app.

There are two aspects that might worth changing:

1. The page return logic: when the user taps the "Return" softkey, go to the previous page until the homepage.
2. The exit logic: on the homepage, double tap "Return" to exit.

I don't have any experience with Android/App programming, so I cannot do the modification. Just want to bring it up here.