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barteksc

Description

Android view for displaying PDFs rendered with PdfiumAndroid

6.3K Stars 1.3K Forks Apache License 2.0 129 Commits 500 Opened issues

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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 3.2.0-beta.1?

  • Merge PR #714 with optimized page load
  • Merge PR #776 with fix for max & min zoom level
  • Merge PR #722 with fix for showing right position when view size changed
  • Merge PR #703 with fix for too many threads
  • Merge PR #702 with fix for memory leak
  • Merge PR #689 with possibility to disable long click
  • Merge PR #628 with fix for hiding scroll handle
  • Merge PR #627 with
    fitEachPage
    option
  • Merge PR #638 and #406 with fixed NPE
  • Merge PR #780 with README fix
  • Update compile SDK and support library to 28
  • Update Gradle and Gradle Plugin

Changes in 3.0 API

  • Replaced
    Contants.PRELOAD_COUNT
    with
    PRELOAD_OFFSET
  • Removed
    PDFView#fitToWidth()
    (variant without arguments)
  • Removed
    Configurator#invalidPageColor(int)
    method as invalid pages are not rendered
  • Removed page size parameters from
    OnRenderListener#onInitiallyRendered(int)
    method, as document may have different page sizes
  • Removed
    PDFView#setSwipeVertical()
    method

Installation

Add to build.gradle:

implementation 'com.github.barteksc:android-pdf-viewer:3.2.0-beta.1'

or if you want to use more stable version:

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

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

ProGuard

If you are using ProGuard, add following rule to proguard config file:

-keep class com.shockwave.**

Include PDFView in your layout


Load a PDF file

All available options with default values:

java
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)
    .onLongPress(onLongPressListener)
    .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)
    .autoSpacing(false) // add dynamic spacing to fit each page on its own on the screen
    .linkHandler(DefaultLinkHandler)
    .pageFitPolicy(FitPolicy.WIDTH) // mode to fit pages in the view
    .fitEachPage(false) // fit each page to the view, else smaller pages are scaled relative to largest page.
    .pageSnap(false) // snap pages to screen boundaries
    .pageFling(false) // make a fling change only a single page like ViewPager
    .nightMode(false) // toggle night mode
    .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.

Links

Version 3.0.0 introduced support for links in PDF documents. By default, DefaultLinkHandler is used and clicking on link that references page in same document causes jump to destination page and clicking on link that targets some URI causes opening it in default application.

You can also create custom link handlers, just implement LinkHandler interface and set it using

Configurator#linkHandler(LinkHandler)
method. Take a look at DefaultLinkHandler source to implement custom behavior.

Pages fit policy

Since version 3.0.0, library supports fitting pages into the screen in 3 modes: * WIDTH - width of widest page is equal to screen width * HEIGHT - height of highest page is equal to screen height * BOTH - based on widest and highest pages, every page is scaled to be fully visible on screen

Apart from selected policy, every page is scaled to have size relative to other pages.

Fit policy can be set using

Configurator#pageFitPolicy(FitPolicy)
. Default policy is WIDTH.

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

FitPolicy.WIDTH
policy or add following snippet when you want to fit desired page in document with different page sizes:
java
Configurator.onRender(new OnRenderListener() {
    @Override
    public void onInitiallyRendered(int pages, float pageWidth, float pageHeight) {
        pdfView.fitToWidth(pageIndex);
    }
});

How can I scroll through single pages like a ViewPager?

You can use a combination of the following settings to get scroll and fling behaviour similar to a ViewPager:

java
    .swipeHorizontal(true)
    .pageSnap(true)
    .autoSpacing(true)
    .pageFling(true)

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 2017 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. ```

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