Android PdfViewer

AndroidPdfViewer 1.x is available on AndroidPdfViewerV1 repo, where can be developed independently. Version 1.x uses different engine for drawing document on canvas, so if you don't like 2.x version, try 1.x.

Library for displaying PDF documents on Android, with animations, gestures, zoom and double tap support. It is based on PdfiumAndroid for decoding PDF files. Works on API 11 (Android 3.0) and higher. Licensed under Apache License 2.0.

What's new in 2.8.0?

• Add handling of invalid pages, inspired by pull request #433. Exception on page opening crashed application until now, currently OnPageErrorListener set with Configurator#onPageError() is called. Invalid page color (Color class) can be set using Configurator#invalidPageColor()
• Implement canScrollVertically() and canScrollHorizontally() methods to work e.g. with SwipeRefreshLayout
• Fix bug when Configurator#load() method was called before view has been measured, which resulted in empty canvas

2.8.1 fixes bug with rendering PDFView in Android Studio Layout Editor

2.8.2 fixes not loaded pages when using animated PDFView#jumpTo()

Changes in 2.0 API

• Configurator#defaultPage(int) and PDFView#jumpTo(int) now require page index (i.e. starting from 0)
• OnPageChangeListener#onPageChanged(int, int) is called with page index (i.e. starting from 0)
• removed scrollbar
• added scroll handle as a replacement for scrollbar, use with Configurator#scrollHandle()
• added OnPageScrollListener listener due to continuous scroll, register with Configurator#onPageScroll()
• default scroll direction is vertical, so Configurator#swipeVertical() was changed to Configurator#swipeHorizontal()
• removed minimap and mask configuration

Installation

Add to build.gradle:

compile 'com.github.barteksc:android-pdf-viewer:2.8.2'

Library is available in jcenter repository, probably it'll be in Maven Central soon.

Include PDFView in your layout

<com.github.barteksc.pdfviewer.PDFView
        android:id="@+id/pdfView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

Load a PDF file

All available options with default values:

pdfView.fromUri(Uri)
or
pdfView.fromFile(File)
or
pdfView.fromBytes(byte[])
or
pdfView.fromStream(InputStream) // stream is written to bytearray - native code cannot use Java Streams
or
pdfView.fromSource(DocumentSource)
or
pdfView.fromAsset(String)
    .pages(0, 2, 1, 3, 3, 3) // all pages are displayed by default
    .enableSwipe(true) // allows to block changing pages using swipe
    .swipeHorizontal(false)
    .enableDoubletap(true)
    .defaultPage(0)
    // allows to draw something on the current page, usually visible in the middle of the screen
    .onDraw(onDrawListener)
    // allows to draw something on all pages, separately for every page. Called only for visible pages
    .onDrawAll(onDrawListener)
    .onLoad(onLoadCompleteListener) // called after document is loaded and starts to be rendered
    .onPageChange(onPageChangeListener)
    .onPageScroll(onPageScrollListener)
    .onError(onErrorListener)
    .onPageError(onPageErrorListener)
    .onRender(onRenderListener) // called after document is rendered for the first time
    // called on single tap, return true if handled, false to toggle scroll handle visibility
    .onTap(onTapListener)
    .enableAnnotationRendering(false) // render annotations (such as comments, colors or forms)
    .password(null)
    .scrollHandle(null)
    .enableAntialiasing(true) // improve rendering a little bit on low-res screens
    // spacing between pages in dp. To define spacing color, set view background
    .spacing(0)
    .invalidPageColor(Color.WHITE) // color of page that is invalid and cannot be loaded
    .load();

• pages is optional, it allows you to filter and order the pages of the PDF as you need

Scroll handle

Scroll handle is replacement for ScrollBar from 1.x branch.

From version 2.1.0 putting PDFView in RelativeLayout to use ScrollHandle is not required, you can use any layout.

To use scroll handle just register it using method Configurator#scrollHandle(). This method accepts implementations of ScrollHandle interface.

There is default implementation shipped with AndroidPdfViewer, and you can use it with .scrollHandle(new DefaultScrollHandle(this)). DefaultScrollHandle is placed on the right (when scrolling vertically) or on the bottom (when scrolling horizontally). By using constructor with second argument (new DefaultScrollHandle(this, true)), handle can be placed left or top.

You can also create custom scroll handles, just implement ScrollHandle interface. All methods are documented as Javadoc comments on interface source.

Document sources

Version 2.3.0 introduced document sources, which are just providers for PDF documents. Every provider implements DocumentSource interface. Predefined providers are available in com.github.barteksc.pdfviewer.source package and can be used as samples for creating custom ones.

Predefined providers can be used with shorthand methods:

pdfView.fromUri(Uri)
pdfView.fromFile(File)
pdfView.fromBytes(byte[])
pdfView.fromStream(InputStream)
pdfView.fromAsset(String)

Custom providers may be used with pdfView.fromSource(DocumentSource) method.

Additional options

Bitmap quality

By default, generated bitmaps are compressed with RGB_565 format to reduce memory consumption. Rendering with ARGB_8888 can be forced by using pdfView.useBestQuality(true) method.

Double tap zooming

There are three zoom levels: min (default 1), mid (default 1.75) and max (default 3). On first double tap, view is zoomed to mid level, on second to max level, and on third returns to min level. If you are between mid and max levels, double tapping causes zooming to max and so on.

Zoom levels can be changed using following methods:

void setMinZoom(float zoom);
void setMidZoom(float zoom);
void setMaxZoom(float zoom);

Possible questions

Why resulting apk is so big?

Android PdfViewer depends on PdfiumAndroid, which is set of native libraries (almost 16 MB) for many architectures. Apk must contain all this libraries to run on every device available on market. Fortunately, Google Play allows us to upload multiple apks, e.g. one per every architecture. There is good article on automatically splitting your application into multiple apks, available here. Most important section is Improving multiple APKs creation and versionCode handling with APK Splits, but whole article is worth reading. You only need to do this in your application, no need for forking PdfiumAndroid or so.

Why I cannot open PDF from URL?

Downloading files is long running process which must be aware of Activity lifecycle, must support some configuration, data cleanup and caching, so creating such module will probably end up as new library.

How can I show last opened page after configuration change?

You have to store current page number and then set it with pdfView.defaultPage(page), refer to sample app

How can I fit document to screen width (eg. on orientation change)?

Use this code snippet:

Configurator.onRender(new OnRenderListener() {
    @Override
    public void onInitiallyRendered(int pages, float pageWidth, float pageHeight) {
        pdfView.fitToWidth(); // optionally pass page number
    }
});

One more thing

If you have any suggestions on making this lib better, write me, create issue or write some code and send pull request.

License

Created with the help of android-pdfview by Joan Zapata

Copyright 2016 Bartosz Schiller

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.