Facebook App Not Working On Android

After setting up Facebook Application:

1. Press on the login button( From my application).
2. If not log in then reroute to the Facebook app.
3. After login into facebook app back to my app and do not reveal me log out button however rather of log out, it shows me login button.

Without set up Facebook app:

1. Press the login button( from my application).
2. Reroute to the facebook page (I have no idea about this page).
3. After login success back to my app, and reveal log out button.

Now Simply put, I desire 2nd scenario same for the First Scenario.