Android widget that can render PDF documents stored on SD card, linked as assets, or downloaded from a remote URL.
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Android widget to display PDF documents in your Activities or Fragments.

Important note: PDFViewPager uses PdfRenderer class, which works only on API 21 or higher. See Official doc for details.

If you are targeting pre-Lollipop devices, have a look at the legacy sample


Add this line in your app/build.gradle

implementation 'es.voghdev.pdfviewpager:library:1.1.2'

If you want to use the old android.support instead of androidx, add this dependency

implementation 'es.voghdev.pdfviewpager:library:1.0.6'


Use PDFViewPager class to load PDF files from assets or SD card

Screenshot Screenshot

1.- Copy your assets to cache directory if your PDF is located on assets directory

CopyAsset copyAsset = new CopyAssetThreadImpl(context, new Handler());
copyAsset.copy(asset, new File(getCacheDir(), "sample.pdf").getAbsolutePath());

2a.- Create your PDFViewPager passing your PDF file, located in assets (see sample)

pdfViewPager = new PDFViewPager(this, "sample.pdf");

2b.- Or directly, declare it on your XML layout


It will automatically have zooming and panning capability

3.- Release adapter in onDestroy

protected void onDestroy() {

    ((PDFPagerAdapter) pdfViewPager.getAdapter()).close();

PDF's on SD card

1.- Create a PDFViewPager object, passing the file location in your SD card

PDFViewPager pdfViewPager = new PDFViewPager(context, getPdfPathOnSDCard());

protected String getPdfPathOnSDCard() {
    File f = new File(getExternalFilesDir("pdf"), "adobe.pdf");
    return f.getAbsolutePath();

2.- Don't forget to release the adapter in onDestroy

    protected void onDestroy() {

        ((PDFPagerAdapter) pdfViewPager.getAdapter()).close();

Remote PDF's from a URL


1.- Add INTERNET, READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE permissions on your AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

2.- Make your Activity or Fragment implement DownloadFile.Listener

public class RemotePDFActivity extends AppCompatActivity implements DownloadFile.Listener {

3.- Create a RemotePDFViewPager object

String url = "http://www.cals.uidaho.edu/edComm/curricula/CustRel_curriculum/content/sample.pdf";

RemotePDFViewPager remotePDFViewPager =
      new RemotePDFViewPager(context, url, this);

4.- Configure the corresponding callbacks and they will be called on each situation.

public void onSuccess(String url, String destinationPath) {
    // That's the positive case. PDF Download went fine

    adapter = new PDFPagerAdapter(this, "AdobeXMLFormsSamples.pdf");

public void onFailure(Exception e) {
    // This will be called if download fails

public void onProgressUpdate(int progress, int total) {
    // You will get download progress here
    // Always on UI Thread so feel free to update your views here

5.- Don't forget to close adapter in onDestroy to release all resources

protected void onDestroy() {


Usage in Kotlin

As you might figure out, the library is fully usable in Kotlin programming language. You can find example code here.

Just import the library as a gradle dependency as you would do in Java.


  • [X] Make initial Pdf scale setable by code (requested by various users on issues)
  • [X] Load PDF documents from SD card
  • [X] Make PDF documents zoomable with pinch and double tap (two approaches, ImageViewZoom and photoview)
  • [X] Unify all features in only one PDFViewPager and PDFPagerAdapter class
  • [X] Support API Levels under 21, by downloading PDF and invoking system native intent.
  • [X] UI tests
  • [X] Add checkstyle, refactor & improve code quality

See changelog for details

Developed By

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This repository has been supported by JetBrains with free licenses for all JetBrains products


Copyright 2016 Olmo Gallegos Hernández

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


Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.


For noobs (like me some months ago)

fork the project into your GitHub account
now clone your GitHub repo for this project
implement your changes
commit your changes, push them into your repo
review your code and send me a pull request if you consider it

For not-so-noobs

Please make sure that your changes pass both checkstyle and UI tests before submitting them

./gradlew checkstyle

./gradlew test

And with your Android device connected

./gradlew connectedCheck
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