Merge "Keyguard should be dismissed if there is no trusted device."

@Singleton

public class FullscreenUserSwitcher {

    private static final String TAG = FullscreenUserSwitcher.class.getSimpleName();

    // Because user 0 is headless, user count for single user is 2

    private static final int NUMBER_OF_BACKGROUND_USERS = 1;

    private final Context mContext;

    private final Resources mResources;

    private final UserManager mUserManager;

                /* isStartGuestSession= */ false,

                /* isAddUser= */ false,

                /* isForeground= */ true);

        // For single user without trusted device, hide the user switcher.

        if (!hasMultipleUsers() && !hasTrustedDevice(initialUser)) {

            dismissUserSwitcher();

            return;

        }

        // Show unlock dialog for initial user

        // If the initial user has trusted device, display the unlock dialog on the keyguard.

        if (hasTrustedDevice(initialUser)) {

            mUnlockDialogHelper.showUnlockDialogAfterDelay(initialUser,

                    mOnHideListener);

        } else {

            // If no trusted device, dismiss the keyguard.

            dismissUserSwitcher();

        }

    }

    /**

     * Check if there is only one possible user to login in.

     * In a Multi-User system there is always one background user (user 0)

     */

    private boolean hasMultipleUsers() {

        return mUserManager.getUserCount() > NUMBER_OF_BACKGROUND_USERS + 1;

    }

    /**

     * Makes user grid visible.

     */