android - Initiating activity for settings class -

In my code, I am calling a priority activity with my main activity, to enter the user name / password below Indicates

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// Launch Preferences Activity

Intent K = New Intent (application.this, settings.class);

current activity (k);

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This call settings .xml, but I want to resume main activity when the user name / password is set and the back button is pressed.

Any hint?

Do you want to reload the key, so that you can use a username and password? If so, then why not use startActivityForResult , validate username / password in Settings.class and read the result in onActivityResult in your main activity?