Difference between InputMethodManager SHOW_FORCED and SHOW_IMPLICIT in Android
SHOW_FORCED and SHOW_IMPLICIT work in tandem with the hiding methods HIDE_IMPLICIT_ONLY and HIDE_NOT_ALWAYS.
Using SHOW_FORCED indicates that the user has explicitly requested that the keyboard be shown (such as by pressing an "open keyboard" button), and thus the system should force it to open. In this case, any existing request to hide the keyboard using the above flags will be ignored (thus the keyboard is "forced" open).
Using SHOW_IMPLICIT means that your app thinks the user wants the keyboard open, but hasn't explicitly requested it. In this case, requests to hide the keyboard with HIDE_IMPLICIT_ONLY or HIDE_NOT_ALWAYS will still be respected.