Pdfium Android binding with Bitmap rendering

Uses pdfium library from AOSP

The demo app (for not modified lib) is here

Forked for use with AndroidPdfViewer project.

API is highly compatible with original version, only additional methods were created.

What's new in 1.10.0?

• This is now using prebuild Pdfium binaries from: https://github.com/bblanchon/pdfium-binaries
• Updated Pdfium to https://github.com/bblanchon/pdfium-binaries/releases/tag/chromium%2F5868
• Removed support for mips since it is not present in prebuild binaries
• Update compile SDK to 33
• Change minimum SDK to 19
• Added Jitpack support for builds
• Added built versions of libpng (1.6.39) and freetype (2.13.1)

Installation

Library is available via jitpack.io. Follow instructions on jitpack

Methods inconsistency

Version 1.8.0 added method for getting page size - PdfiumCore#getPageSize(...). It is important to note, that this method does not require page to be opened. However, there are also old PdfiumCore#getPageWidth(...), PdfiumCore#getPageWidthPoint(...), PdfiumCore#getPageHeight() and PdfiumCore#getPageHeightPoint() which require page to be opened.

This inconsistency will be resolved in next major version, which aims to redesign API.

Reading links

Version 1.8.0 introduces PdfiumCore#getPageLinks(PdfDocument, int) method, which allows to get list of links from given page. Links are returned as List of type PdfDocument.Link. PdfDocument.Link holds destination page (may be null), action URI (may be null or empty) and link bounds in document page coordinates. To map page coordinates to screen coordinates you may use PdfiumCore#mapRectToDevice(...). See PdfiumCore#mapPageCoordsToDevice(...) for parameters description.

Sample usage:

PdfiumCore core = ...;
PdfDocument document = ...;
int pageIndex = 0;
core.openPage(document, pageIndex);
List<PdfDocument.Link> links = core.getPageLinks(document, pageIndex);
for (PdfDocument.Link link : links) {
    RectF mappedRect = core.mapRectToDevice(document, pageIndex, ..., link.getBounds())

    if (clickedArea(mappedRect)) {
        String uri = link.getUri();
        if (link.getDestPageIdx() != null) {
            // jump to page
        } else if (uri != null && !uri.isEmpty()) {
            // open URI using Intent
        }
    }
}

Simple example

void openPdf() {
    ImageView iv = (ImageView) findViewById(R.id.imageView);
    ParcelFileDescriptor fd = ...;
    int pageNum = 0;
    PdfiumCore pdfiumCore = new PdfiumCore(context);
    try {
        PdfDocument pdfDocument = pdfiumCore.newDocument(fd);

        pdfiumCore.openPage(pdfDocument, pageNum);

        int width = pdfiumCore.getPageWidthPoint(pdfDocument, pageNum);
        int height = pdfiumCore.getPageHeightPoint(pdfDocument, pageNum);

        // ARGB_8888 - best quality, high memory usage, higher possibility of OutOfMemoryError
        // RGB_565 - little worse quality, twice less memory usage
        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

        iv.setImageBitmap(bitmap);

        printInfo(pdfiumCore, pdfDocument);

        pdfiumCore.closeDocument(pdfDocument); // important!
    } catch(IOException ex) {
        ex.printStackTrace();
    }
}

public void printInfo(PdfiumCore core, PdfDocument doc) {
    PdfDocument.Meta meta = core.getDocumentMeta(doc);
    Log.e(TAG, "title = " + meta.getTitle());
    Log.e(TAG, "author = " + meta.getAuthor());
    Log.e(TAG, "subject = " + meta.getSubject());
    Log.e(TAG, "keywords = " + meta.getKeywords());
    Log.e(TAG, "creator = " + meta.getCreator());
    Log.e(TAG, "producer = " + meta.getProducer());
    Log.e(TAG, "creationDate = " + meta.getCreationDate());
    Log.e(TAG, "modDate = " + meta.getModDate());

    printBookmarksTree(core.getTableOfContents(doc), "-");

}

public void printBookmarksTree(List<PdfDocument.Bookmark> tree, String sep) {
    for (PdfDocument.Bookmark b : tree) {

        Log.e(TAG, String.format("%s %s, p %d", sep, b.getTitle(), b.getPageIdx()));

        if (b.hasChildren()) {
            printBookmarksTree(b.getChildren(), sep + "-");
        }
    }
}

Build native part

Go to PROJECT_PATH/src/main/jni and run command $ ndk-build. This step may be executed only once, every future .aar build will use generated libs.