Generate Thumbnail of Pdf in Android

Question

I want to generate the image(thumbnail) from pdf file just like done by WhatsApp as shown below

I have tried

1. PDFBox (https://github.com/TomRoush/PdfBox-Android)
2. Tika (compile 'org.apache.tika:tika-parsers:1.11')
3. AndroidPdfViewer (https://github.com/barteksc/AndroidPdfViewer)

and still unable to find a way to generate image from pdf.

---

PDFBox:

There is a github issue that deals with this problem (https://github.com/TomRoush/PdfBox-Android/issues/3) but this is still unresolved.

Note: I am successfully able to extract image from PDF using PDFBOX

---

AndroidPdfViewer:

Github issue (https://github.com/barteksc/AndroidPdfViewer/issues/49)

Solution

val file = Constant.allMediaList[position]
val filename = Environment.getExternalStoragePublicDirectory(file)
if (file != null) {
    if (file.endsWith(".pdf")){
        val fd :ParcelFileDescriptor= ParcelFileDescriptor.open(filename,ParcelFileDescriptor.MODE_READ_WRITE)
        val pageNum: Int  = 0;
        val pdfiumCore: PdfiumCore  = PdfiumCore(mContext);
        try {
            val pdfDocument: PdfDocument = pdfiumCore.newDocument(fd);
            pdfiumCore.openPage(pdfDocument, pageNum);
            val width:  Int  = pdfiumCore.getPageWidthPoint(pdfDocument, pageNum);
            val height:  Int = pdfiumCore.getPageHeightPoint(pdfDocument, pageNum);

            // ARGB_8888 - best quality, high memory usage, higher possibility of OutOfMemoryError
            // RGB_565 - little worse quality, twice less memory usage
            val bitmap: Bitmap = Bitmap.createBitmap(width, height,
                  Bitmap.Config.RGB_565);
            pdfiumCore.renderPageBitmap(pdfDocument, bitmap, pageNum, 0, 0,width, height);
            //if you need to render annotations and form fields, you can use
            //the same method above adding 'true' as last param

            Glide.with(mContext)
                .load(bitmap).into(holder.thumbnail)

            pdfiumCore.closeDocument(pdfDocument); // important!
        } catch(ex: IOException) {
            ex.printStackTrace();
            Toast.makeText(mContext,"failed",Toast.LENGTH_LONG).show()
        }

    }