Merge "Do not call update() for read only APNs." into oc-dev am: 8f18f8e0

     * Check the key fields' validity and save if valid.

     * @param force save even if the fields are not valid, if the app is

     *        being suspended

     * @return true if the data was saved

     * @return true if there's no error

     */

    private boolean validateAndSave(boolean force) {

        // nothing to do if it's a read only APN

        if (mReadOnlyApn) {

            return true;

        }

        String name = checkNotSet(mName.getText());

        String apn = checkNotSet(mApn.getText());

        String mcc = checkNotSet(mMcc.getText());