How do I store an email and auth token from my api?

I am developing an app that uses an API to connect to our server to authenticate a user via email and password.  When that person successfully logs in a token is returned.  I need to store that token on the phone to be called to use functions for our app.  Can anyone help me woth the coding that will be needed to do this.  I have researched the Android Keystore but I have not gotten anywhere with the actual coding.  I have de-bugged my app and I do see the token is coming back on successful logins.
robdijoAsked:
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Tomas Helgi JohannssonCommented:
Hi!

What you need to do is implementing some way to store that token to a file on the phone or it's SD card if available
http://www.java2s.com/Code/Android/File/File.htm
And make sure that that info is crypted and secure
http://www.java2s.com/Code/Android/Security/CatalogSecurity.htm
Other android examples
http://www.java2s.com/Code/Android/CatalogAndroid.htm

Keystore is for certificates only.

Regards,
    Tomas Helgi

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robdijoAuthor Commented:
Thank you!
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