Implemented onRestrictBackgroundBlacklistChanged().

    private final INetworkPolicyListener mPolicyListener = new INetworkPolicyListener.Stub() {

        @Override

        public void onUidRulesChanged(final int uid, int uidRules) throws RemoteException {

        }

        @Override

        public void onRestrictBackgroundBlacklistChanged(int uid, boolean blacklisted) {

            if (mBlacklist == null) {

                loadBlacklist();

            }

            final boolean isBlacklisted = uidRules == POLICY_REJECT_METERED_BACKGROUND;

            mBlacklist.put(uid, isBlacklisted);

            mBlacklist.put(uid, blacklisted);

            mHandler.post(new Runnable() {

                @Override

                public void run() {

                    handleBlacklistChanged(uid, isBlacklisted);

                    handleBlacklistChanged(uid, blacklisted);

                }

            });

        }