checkAccess Java

 /**
     * Checks if the user should have access to the app.
     *
     * @param callback
     */
    public synchronized void checkAccess(LicenseCheckerCallback callback) {
        // If we have a valid recent LICENSED response, we can skip asking
        // Market.
        if (mPolicy.allowAccess()) {
            Log.i(TAG, "Using cached license response");
            callback.allow();
        } else {
            LicenseValidator validator = new LicenseValidator(mPolicy, new NullDeviceLimiter(),
                callback, generateNonce(), mPackageName, mVersionCode);

            if (mService == null) {
               Log.i(TAG, "Binding to licensing service.");
                try {
                    boolean bindResult = mContext.bindService(
                        new Intent(ILicensingService.class.getName()),
                        this,  // ServiceConnection.
                        Context.BIND_AUTO_CREATE);

                    if (bindResult) {
                        mPendingChecks.offer(validator);
                    } else {
                        Log.e(TAG, "Could not bind to service.");
                        handleServiceConnectionError(validator);
                    }
                } catch (SecurityException e) {
                    callback.applicationError(ApplicationErrorCode.MISSING_PERMISSION);
                }
            } else {
                mPendingChecks.offer(validator);
                runChecks();
            }
        }
    }