Load epub data from assets

load_epub_asset.dart

  Future<EpubController> loadEpub() async {
    var asset = await PlatformAssetBundle().load("assets/alice.epub");
    return EpubController(
        document: EpubDocument.openData(asset.buffer
            .asUint8List(asset.offsetInBytes, asset.lengthInBytes)));
  }

  @override
  Widget build(BuildContext context) => FutureBuilder<EpubController>(
      future: loadEpub(),
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          return const Text("Waiting......");
        } else if (snapshot.hasError) {
          return Text("Error : ${snapshot.error}");
        } else {
          var epubController = snapshot.data!;
          return Scaffold(
            appBar: AppBar(
              // Show actual chapter name
              title: EpubViewActualChapter(
                  controller: epubController,
                  builder: (chapterValue) => Text(
                        'Chapter: ${chapterValue?.chapter?.Title?.replaceAll('\n', '').trim() ?? ''}',
                        textAlign: TextAlign.start,
                      )),
            ),
            // Show table of contents
            drawer: Drawer(
              child: EpubViewTableOfContents(
                controller: epubController,
              ),
            ),
            // Show epub document
            body: EpubView(
              controller: epubController,
            ),
          );
        }
      });