To synchronize Google Contact and Calendar data, the Akonadi Google Data API mut be installed on your system. Depending on your package manager, the install procedure may be different.
To install it, enter a terminal and type:
DEB based distributions: sudo apt-get install akonadi-kde-resource-googledata RPM based distributions: yum install akonadi-googledata
This will install the akonadi-kde-resource-googledata package as well as its prerequisite, libgcal0
After installing the packages, go to the Contacts area of the Kontact left navigation bar. Next, on the first panel ,the Address Books panel, right click the window and select “Add Address Book”. Ensure that the “Akonadi Google Contacts Resource” is selected, and then click OK. A pop-up window will appear that will ask for your Google account login credentials. Enter them and click OK. Check the box next to the “akonadi_google_resource_0” and then press F5 to update your contacts. Your contacts have now been synchronized!