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.

This repo was forked from PdfiumAndroid

The purpose is to remove old support libraries so we no longer need to use jetifier.

It will be used with the forked AndroidPdFViewer

What's new in 1.9.2

This is functionally the same as 1.9.1 just fixing some documentation on maven central

What's new in 1.9.1

• Update Gradle plugins and configurations
• Update compile sdk to 31
• Change minimum SDK to 19
• Remove support-v4 library
• Drop support for mips

What's new in 1.9.0?

• Updated Pdfium library to 7.1.2_r36
• Changed gnustl_static to c++_shared
• Update Gradle plugins
• Update compile SDK and support library to 26
• Change minimum SDK to 14
• Add support for mips64

Installation

Add to build.gradle:

compile 'com.github.mhiew:pdfium-android:1.9.2'

Library is available in jcenter and Maven Central repositories.

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.