Category: Android PDF Toolkit – qPDF

Sample Android program to extract text content from a PDF document as a String using Qoppa’s Android toolkit qPDF Toolkit. This program will extract the text from all pages of the PDF. //must be called before utilizing qPDF Toolkit StandardFontTF.mAssetMgr = getAssets();   //load the PDF document you want to extract text from File file […]

Q: JavaScript does not seem to be running when I load a PDF programmatically. JavaScript works fine when I load a PDF through the toolbar open button on the QPDFViewerView. A: JavaScript in Qoppa qPDF Toolkit requires an Android context to run within. When you open the document from the viewer, we automatically set the […]

They way apps get permissions has changed as of API 23. If the device is running Android 6.0 or higher, and your app’s target SDK is 23 or higher: The app has to list the permissions in the manifest, and it must request each dangerous permission it needs while the app is running. The user […]

Q: How do you suggest we open PDF files from a USB key or removable device? When Qoppa’s PDF Android toolkit opens a PDF file, by default it uses a RandomAccessFile object and reads parts of the PDF file on-demand. The reason to do this is to preserve memory which is limited on Android. You […]

Here is a sample code in Android showing how to launch QPDFNotesView and add a document listener that implements the documentOpened() method, allowing to do something each time a PDF document is open. In this sample, when a PDF is open and it is an interactive PDF form, all interactive form fields are set to […]

List of JavaScript functions supported in qPDFToolkit: App Methods: alert beep Console Methods: println Doc Methods: calculateNow getField getNthFieldName Properties: calculate numFields URL Field Methods: buttonGetCaption buttonSetCaption clearItems deleteItemAt getArray getItemAt insertItemAt isBoxChecked setAction setItems Properties: borderStyle borderWidth calcOrderIndex charLimit comb commitOnSelChange currentValueIndices defaultValue delay display doc doNotScroll doNotSpellCheck editable exportValues fileSelect fillColor hidden lineWidth […]

Q: How can I implement a fit to height view using Qoppa’s Android qPDF Toolkit and the PDF Viewer QPDFNotesView? A: We don’t have a predefined way of fitting the document to its height within the viewer. You can calculate the appropriate scale and set it on the viewer. See sample code below. package com.sample; […]

Q: When searching text in the PDF document and the input keyboard is open on the screen, it is no longer possible to scroll all the way up to the beginning of the PDF document. A: This is actually an Android setting. When the keyboard is showing on the screen, Android will adjust the visible […]

A: I am using QPDFNotesView within qPDF Toolkit to display, annotate and fill PDF forms in Android. Is there a mechanism that allows to be notified when a PDF document has been changed, for instance when a form field has been updated? A: Yes, this is possible by adding a DocumentListener, see sample code below. […]

Q : I am trying to load a PDF document using Qoppa’s Android PDF toolkit and getting the following error: Caused by: java.lang.NullPointerException at android.graphics.Typeface.nativeCreateFromAsset(Native Method) at android.graphics.Typeface.createFromAsset(Typeface.java:149) at com.qoppa.android.pdfViewer.fonts.StandardFontTF.getTypeface(Unknown Source) at com.qoppa.android.pdfViewer.fonts.StandardFontTF.getFont(Unknown Source) at com.qoppa.android.pdfViewer.fonts.t.b(Unknown Source) at com.qoppa.android.pdfProcess.PDFPage.(Unknown Source) A: You need to load the font assets before using our library. //this static allows […]

Q: Can your Android library render PDF documents on both ARM and x86 architectures? A: Yes, our PDF android toolkit qPDF Toolkit supports both ARM and x86 architectures. When you download the toolkit, you will find a “libs” folder that contains native Android libraries. You will notice different folders for armeabi, armeabi-v7a and x86. The […]

As part of Qoppa’s Android toolkit, there is also a class included called QPDFNotesView that extends an Android View. This class can be used within your application to show PDF documents and also provides annotation tools, similar to our qPDF Notes app. Our Android View QPDFNotesView can: Display PDF documents Review and annotate PDFs Digitally […]

Q: As we’re in the process of integrating your Android PDF viewer sdk into Android application, we are seeing some refresh issues with only parts of the PDF being rendered in the View. When we scroll, we see blank pages. Rotating the android device or zooming will force a refresh but we still have the […]

This is an implementation of an Android PDF Viewer that uses the qPDF Toolkit to render the PDF content. This viewer is intended as a starting point in the implementation of a custom viewer, the source code is provided so that it can be customized to meet the needs of the app that uses the […]

Download the following zip file from our website: qpdftoolkit.zip This file contains four items: version_history.txt – This text file will be updated with each new version of the toolkit. qoppapdf.jar – This is the main jar file for the toolkit. This jar file needs to be added to the classpath for your project. assets folder […]

This is the structure of QPDFSamplesViewer a sample project using qoppapdf.zip, Android Qoppa’s PDF toolkit, within Android Studio. Download qpdftoolkit.zip (containing qoppapdf.jar, libs and assets folder) Downnload qPDF_Samples_Viewer.zip Make sure that the libs folder, jniLibs folder and the assets folder are in the correct location so that they are available as resources. Make sure to add […]

Below is a structure of QPDFSamplesViewer, a sample project using qoppapdf.jar, Android Qoppa’s PDF toolkit, within Eclipse. Download qpdftoolkit.zip which includes qoppapdf.jar, libs and assets folder Download qPDF_Samples_Viewer.zip Make sure that the libs folder and the assets folder are in the correct location so that they are available as resources.

Q: I am evaluating your Android PDF Library, qPDF Toolkit and the images do not seem to display. A: qPDF Toolkit ships with a few libraries, including JPEG decoders for rendering JPEG images. They are located under the “libs” folder in the qpdftoolkit.zip file. These libraries need to be available as resources for JPEG images […]