ComposePdfViewer

A simple Jetpack Compose PDF viewer

Demo

Usage

PdfViewer(
    pdfResId = R.raw.demo,
    modifier = Modifier.fillMaxSize(),
    backgroundColor = Color(0xFF909090),
    pageColor = Color.White,
    listDirection = PdfListDirection.VERTICAL,
    arrangement = Arrangement.spacedBy(16.dp),
    fallbackWidget = {
        Icon(
            Icons.Rounded.Info,
            contentDescription = "Error Component"
        )
    },
    loadingListener = { isLoading, currentPage, maxPage ->
         // Observe loading changes
    }
)

// Or if you already have an InputStream
PdfViewer(
    pdfStream = inputStream,
    modifier = Modifier.fillMaxSize(),
    backgroundColor = Color(0xFF909090),
    pageColor = Color.White,
    listDirection = PdfListDirection.VERTICAL,
    arrangement = Arrangement.spacedBy(16.dp),
    fallbackWidget = {
        // Display Custom Widget if an error occurred while rendering the pdf file
    },
    loadingListener = { isLoading, currentPage, maxPage ->
         // Observe loading changes
    }
)

// Or if you want to implement your own page layout
PdfViewer(
   pdfStream = inputStream,
   modifier = Modifier.fillMaxSize(),
   backgroundColor = Color(0xFF909090),
   listDirection = PdfListDirection.VERTICAL,
   arrangement = Arrangement.spacedBy(16.dp),
    fallbackWidget = {
        // Display Custom Widget if an error occurred while rendering the pdf file
    },
   loadingListener = { isLoading, currentPage, maxPage ->
        // Observe loading changes
   },
   page = { lazyListState, imageBitmap ->
        // Implement your own custom page
   }
 )

Known problems

• Zoom pan is not restricted (Any fix to that should go to ComposeZoomableImagePlus)
• Load performance is slow (on average, the PDF Viewer loads about 4 pages a second on a Pixel 2 emulator)

Future changes (other than fixing the known problems)

• Add ram caching for the pdf pages in case the PDF is not as heavy and doesn't need disk caching
• Publish to Jitpack