Merge "Add null check for uri" into main

     * ready to execute it and connectivity is available.

     *

     * @param request the parameters specifying this download

     * @return an ID for the download, unique across the system.  This ID is used to make future

     * calls related to this download.

     * @return an ID for the download, unique across the system.  This ID is used to make

     * future calls related to this download. Returns -1 if the operation fails.

     */

    public long enqueue(Request request) {

        ContentValues values = request.toContentValues(mPackageName);

        Uri downloadUri = mResolver.insert(Downloads.Impl.CONTENT_URI, values);

        if (downloadUri == null) {

            // If insert fails due to RemoteException, it would return a null uri.

            return -1;

        }

        long id = Long.parseLong(downloadUri.getLastPathSegment());

        return id;

    }