Can someone give me an example on how to display image in PDF file using Apache PDFBox 2.0.3?
Thanks in advance
You might want to look at the pdfbox examples directory in the Apache SVN repository, in particular the aptly named example class AddImageToPDF with this pivotal method:
public void createPDFFromImage( String inputFile, String imagePath, String outputFile )
throws IOException
{
// the document
PDDocument doc = null;
try
{
doc = PDDocument.load( new File(inputFile) );
//we will add the image to the first page.
PDPage page = doc.getPage(0);
// createFromFile is the easiest way with an image file
// if you already have the image in a BufferedImage,
// call LosslessFactory.createFromImage() instead
PDImageXObject pdImage = PDImageXObject.createFromFile(imagePath, doc);
PDPageContentStream contentStream = new PDPageContentStream(doc, page, AppendMode.APPEND, true);
// contentStream.drawImage(ximage, 20, 20 );
// better method inspired by http://stackoverflow.com/a/22318681/535646
// reduce this value if the image is too large
float scale = 1f;
contentStream.drawImage(pdImage, 20, 20, pdImage.getWidth()*scale, pdImage.getHeight()*scale);
contentStream.close();
doc.save( outputFile );
}
finally
{
if( doc != null )
{
doc.close();
}
}
}
Related
I'm using the Syncfusion PDF viewer for Xamarin Forms to display a collection of PDF files and it seems the conversion from PDF to PNG (to extract the first page (the cover) of the PDF file to show it, to the user, into a carousel) didn't work in Xamarin [see https://www.syncfusion.com/kb/9112/how-to-convert-pdf-to-png]
I wonder if there is a way to convert PDF into PNG on the Xamarin platform or if I should convert it on the server side.
Thank you.
You can export PDF pages to images without using Syncfusion PDF Viewer control by consuming the PdfRenderer , CGPDFDocument, and PdfDocument classes.
Xamarin.Forms.Android:
//initialize PDFRenderer by passing PDF file from location.
PdfRenderer renderer = new PdfRenderer(GetSeekableFileDescriptor());
int pageCount = renderer.PageCount;
for(int i=0;i<pageCount;i++)
{
// Use `openPage` to open a specific page in PDF.
Page page = renderer.OpenPage(i);
//Creates bitmap
Bitmap bmp = Bitmap.CreateBitmap(page.Width, page.Height, Bitmap.Config.Argb8888);
//renderes page as bitmap, to use portion of the page use second and third parameter
page.Render(bmp, null, null, PdfRenderMode.ForDisplay);
//Save the bitmap
SaveImage(bmp);
page.Close();
}
//Method to retrieve PDF file from the location
private ParcelFileDescriptor GetSeekableFileDescriptor()
{
ParcelFileDescriptor fileDescriptor = null;
try
{
string root = Android.OS.Environment.ExternalStorageDirectory.ToString()+ "/Syncfusion/sample.pdf";
fileDescriptor = ParcelFileDescriptor.Open(new Java.IO.File(root),ParcelFileMode.ReadOnly
);
}
catch (FileNotFoundException e)
{
}
return fileDescriptor;
}
Xamarin.Forms.iOS:
public void ConvertToImage(Stream fileStream) //Pass PDF stream
{
MemoryStream stream = new MemoryStream();
// Create memory stream from file stream.
fileStream.CopyTo(stream);
// Create data provider from bytes.
CGDataProvider provider = new CGDataProvider(stream.ToArray());
try
{
//Load a PDF file.
m_pdfDcument = new CGPDFDocument(provider);
}
catch (Exception)
{
}
//Get PDF's page and convert as image.
using (CGPDFPage pdfPage = m_pdfDcument.GetPage(2))
{
//initialise image context.
UIGraphics.BeginImageContext(pdfPage.GetBoxRect(CGPDFBox.Media).Size);
// get current context.
CGContext context = UIGraphics.GetCurrentContext();
context.SetFillColor(1.0f, 1.0f, 1.0f, 1.0f);
// Gets page's bounds.
CGRect bounds = new CGRect(pdfPage.GetBoxRect(CGPDFBox.Media).X, pdfPage.GetBoxRect(CGPDFBox.Media).Y, pdfPage.GetBoxRect(CGPDFBox.Media).Width, pdfPage.GetBoxRect(CGPDFBox.Media).Height);
if (pdfPage != null)
{
context.FillRect(bounds);
context.TranslateCTM(0, bounds.Height);
context.ScaleCTM(1.0f, -1.0f);
context.ConcatCTM(pdfPage.GetDrawingTransform(CGPDFBox.Crop, bounds, 0, true));
context.SetRenderingIntent(CGColorRenderingIntent.Default);
context.InterpolationQuality = CGInterpolationQuality.Default;
// Draw PDF page in the context.
context.DrawPDFPage(pdfPage);
// Get image from current context.
pdfImage = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
}
}
// Get bytes from UIImage object.
using (var imageData = pdfImage.AsPNG())
{
imageBytes = new byte[imageData.Length];
System.Runtime.InteropServices.Marshal.Copy(imageData.Bytes, imageBytes, 0, Convert.ToInt32(imageData.Length));
//return bytes;
}
//Create image from bytes.
imageStream = new MemoryStream(imageBytes);
//Save the image. It is a custom method to save the image
Save("PDFtoImage.png", "image/png", imageStream);
}
Xamarin.Forms.UWP
public async void ConvertToImage(Stream fileStream) //Pass PDF stream
{
StorageFile file = null;
//Creates file picker to choose PDF file.
FileOpenPicker filePicker = new FileOpenPicker();
filePicker.FileTypeFilter.Add(".pdf");
filePicker.ViewMode = PickerViewMode.Thumbnail;
filePicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
filePicker.SettingsIdentifier = "picker1";
filePicker.CommitButtonText = "Open Pdf File";
//Open file picker option
file = await filePicker.PickSingleFileAsync();
// Load selected PDF file from the file picker.
PdfDocument pdfDocument = await PdfDocument.LoadFromFileAsync(file);
if (pdfDocument != null && pdfDocument.PageCount > 0)
{
for (int pageIndex = 0; pageIndex < pdfDocument.PageCount; pageIndex++)
{
//Get page from a PDF file.
var pdfPage = pdfDocument.GetPage((uint)pageIndex);
if (pdfPage != null)
{
//Create temporary folder to store images.
StorageFolder tempFolder = ApplicationData.Current.TemporaryFolder;
//Create image file.
StorageFile destinationFile = await KnownFolders.CameraRoll.CreateFileAsync(Guid.NewGuid().ToString() + ".jpg");
if (destinationFile != null)
{
IRandomAccessStream randomStream = await destinationFile.OpenAsync(FileAccessMode.ReadWrite);
//Crerate PDF rendering options
PdfPageRenderOptions pdfPageRenderOptions = new PdfPageRenderOptions();
pdfPageRenderOptions.DestinationWidth = (uint)(300);
// Render the PDF's page as stream.
await pdfPage.RenderToStreamAsync(randomStream, pdfPageRenderOptions);
await randomStream.FlushAsync();
//Dispose the random stream
randomStream.Dispose();
//Dispose the PDF's page.
pdfPage.Dispose();
}
}
}
}
}
I work for Syncfusion.
I am implementing functionality to allow user to draw figures in pdf. I want to draw all the figures in a single layer, which can be made visible or invisible by the user.I am able to create a new layer in a pdf. I am also able to retrieve that layer.But, I am not able to make modification to layer (PDOptionalContentGroup). I tried converting the PDOptionalContentGroup to PDPage and then making desired changes to PDPPage. I also saved the PDDocument.It only created another layer with the same name as previous one, but the changes were not there.Here is the code that I used:
PDFont font = PDType1Font.HELVETICA;
PDDocument doc = PDDocument.load(src);
PDOptionalContentProperties ocprops = doc.getDocumentCatalog().getOCProperties();
foreach (string groupName in ocprops.getGroupNames())
{
PDOptionalContentGroup group = ocprops.getGroup(groupName);
COSBase cosbase = group.getCOSObject();
PDPage groupPage = new PDPage((COSDictionary)cosbase);
PDPageContentStream cs = new PDPageContentStream(doc, groupPage, true, false);
cs.beginText();
cs.setFont(font, 12);
cs.moveTextPositionByAmount(150, 200);
cs.drawString("Testing added to group:" + groupName);
cs.endText();
cs.close();
doc.save(src);
}
(In a comment the OP indicated that he can only use a 1.8.x version of PDFBox. Thus, the code here is 1.8'ish, tested against PDFBox 1.8.12 for Java.)
In a comment to your question "How to get resource names for optional content group in a pdf?" Tilman Hausherr suggested to use the PDFBox class LayerUtility as template for own solutions.
Thus, as an example how add to an existing OCG this helper method (based on LayerUtility.appendFormAsLayer) shows how to add text to an existing or new OCG. It should be simple to adapt it to adding the content you want to add...
void addTextToLayer(PDDocument document, int pageNumber, String layerName, float x, float y, String text) throws IOException
{
PDDocumentCatalog catalog = document.getDocumentCatalog();
PDOptionalContentProperties ocprops = catalog.getOCProperties();
if (ocprops == null)
{
ocprops = new PDOptionalContentProperties();
catalog.setOCProperties(ocprops);
}
PDOptionalContentGroup layer = null;
if (ocprops.hasGroup(layerName))
{
layer = ocprops.getGroup(layerName);
}
else
{
layer = new PDOptionalContentGroup(layerName);
ocprops.addGroup(layer);
}
PDPage page = (PDPage) document.getDocumentCatalog().getAllPages().get(pageNumber);
PDResources resources = page.findResources();
if (resources == null)
{
resources = new PDResources();
page.setResources(resources);
}
PDPropertyList props = resources.getProperties();
if (props == null)
{
props = new PDPropertyList();
resources.setProperties(props);
}
//Find first free resource name with the pattern "MC<index>"
int index = 0;
PDOptionalContentGroup ocg;
COSName resourceName;
do
{
resourceName = COSName.getPDFName("MC" + index);
ocg = props.getOptionalContentGroup(resourceName);
index++;
} while (ocg != null);
//Put mapping for our new layer/OCG
props.putMapping(resourceName, layer);
PDFont font = PDType1Font.HELVETICA;
PDPageContentStream contentStream = new PDPageContentStream(document, page, true, true, true);
contentStream.beginMarkedContentSequence(COSName.OC, resourceName);
contentStream.beginText();
contentStream.setFont(font, 12);
contentStream.moveTextPositionByAmount(x, y);
contentStream.drawString(text);
contentStream.endText();
contentStream.endMarkedContentSequence();
contentStream.close();
}
(AddContentToOCG helper method addTextToLayer)
You can use it like this
PDDocument document = new PDDocument();
PDPage page = new PDPage();
document.addPage(page);
addTextToLayer(document, 0, "MyLayer", 30, 600, "Text in new layer 'MyLayer'");
addTextToLayer(document, 0, "MyOtherLayer", 230, 550, "Text in new layer 'MyOtherLayer'");
addTextToLayer(document, 0, "MyLayer", 30, 500, "Text in existing layer 'MyLayer'");
addTextToLayer(document, 0, "MyOtherLayer", 230, 450, "Text in existing layer 'MyOtherLayer'");
document.save(new File(RESULT_FOLDER, "TextInOCGs.pdf"));
document.close();
(AddContentToOCG test method testAddContentToNewOrExistingOCG)
to add text to existing or not yet existing OCGs.
I'm trying to export text and SVG graphs to a PDF. I found out that iText and batik can do this. So I tried doing that, but everytime I put in a graph, it would become extraordinary small.
I thought it might be something with my code, so I figured I would try an examplecode from Vaadin.
public class PdfExportDemo {
private String fontDirectory = null;
private final String baseFont = "Arial";
private PdfWriter writer;
private Document document;
private Font captionFont;
private Font normalFont;
private String svgStr;
/**
* Writes a PDF file with some static example content plus embeds the chart
* SVG.
*
* #param pdffilename
* PDF's filename
* #param svg
* SVG as a String
* #return PDF File
*/
public File writePdf(String pdffilename, String svg) {
svgStr = svg;
document = new Document();
document.addTitle("PDF Sample");
document.addCreator("Vaadin");
initFonts();
File file = null;
try {
file = writeToFile(pdffilename, document);
document.open();
writePdfContent();
document.close();
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return file;
}
/**
* Get Font directory that will be checked for custom fonts.
*
* #return Path to fonts
*/
public String getFontDirectory() {
return fontDirectory;
}
/**
* Set Font directory that will be checked for custom fonts.
*
* #param fontDirectory
* Path to fonts
*/
public void setFontDirectory(String fontDirectory) {
this.fontDirectory = fontDirectory;
}
private void initFonts() {
if (fontDirectory != null) {
FontFactory.registerDirectory(fontDirectory);
}
captionFont = FontFactory.getFont(baseFont, 10, Font.BOLD, new Color(0,
0, 0));
normalFont = FontFactory.getFont(baseFont, 10, Font.NORMAL, new Color(
0, 0, 0));
}
private File writeToFile(String filename, Document document)
throws DocumentException {
File file = null;
try {
file = File.createTempFile(filename, ".pdf");
file.deleteOnExit();
FileOutputStream fileOut = new FileOutputStream(file);
writer = PdfWriter.getInstance(document, fileOut);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return file;
}
private void writePdfContent() throws DocumentException, IOException {
Paragraph caption = new Paragraph();
caption.add(new Chunk("Vaadin Charts Export Demo PDF", captionFont));
document.add(caption);
Paragraph br = new Paragraph(Chunk.NEWLINE);
document.add(br);
Paragraph paragraph = new Paragraph();
paragraph.add(new Chunk("This PDF is rendered with iText 2.1.7.",
normalFont));
document.add(paragraph);
paragraph = new Paragraph();
paragraph
.add(new Chunk(
"Chart below is originally an SVG image created with Vaadin Charts and rendered with help of Batik SVG Toolkit.",
normalFont));
document.add(paragraph);
document.add(createSvgImage(writer.getDirectContent(), 400, 400));
document.add(createExampleTable());
}
private PdfPTable createExampleTable() throws BadElementException {
PdfPTable table = new PdfPTable(2);
table.setHeaderRows(1);
table.setWidthPercentage(100);
table.setTotalWidth(100);
// Add headers
table.addCell(createHeaderCell("Browser"));
table.addCell(createHeaderCell("Percentage"));
// Add rows
table.addCell(createCell("Firefox"));
table.addCell(createCell("45.0"));
table.addCell(createCell("IE"));
table.addCell(createCell("26.8"));
table.addCell(createCell("Chrome"));
table.addCell(createCell("12.8"));
table.addCell(createCell("Safari"));
table.addCell(createCell("8.5"));
table.addCell(createCell("Opera"));
table.addCell(createCell("6.2"));
table.addCell(createCell("Others"));
table.addCell(createCell("0.7"));
return table;
}
private PdfPCell createHeaderCell(String caption)
throws BadElementException {
Chunk chunk = new Chunk(caption, captionFont);
Paragraph p = new Paragraph(chunk);
p.add(Chunk.NEWLINE);
p.add(Chunk.NEWLINE);
PdfPCell cell = new PdfPCell(p);
cell.setBorder(0);
cell.setBorderWidthBottom(1);
cell.setHorizontalAlignment(PdfPCell.ALIGN_LEFT);
cell.setVerticalAlignment(PdfPCell.ALIGN_MIDDLE);
return cell;
}
private PdfPCell createCell(String value) throws BadElementException {
PdfPCell cell = new PdfPCell(new Phrase(new Chunk(value, normalFont)));
cell.setBorder(0);
cell.setHorizontalAlignment(PdfPCell.ALIGN_LEFT);
return cell;
}
private Image drawUnscaledSvg(PdfContentByte contentByte)
throws IOException {
// First, lets create a graphics node for the SVG image.
GraphicsNode imageGraphics = buildBatikGraphicsNode(svgStr);
// SVG's width and height
float width = (float) imageGraphics.getBounds().getWidth();
float height = (float) imageGraphics.getBounds().getHeight();
// Create a PDF template for the SVG image
PdfTemplate template = contentByte.createTemplate(width, height);
// Create Graphics2D rendered object from the template
Graphics2D graphics = template.createGraphics(width, height);
try {
// SVGs can have their corner at coordinates other than (0,0).
Rectangle2D bounds = imageGraphics.getBounds();
graphics.translate(-bounds.getX(), -bounds.getY());
// Paint SVG GraphicsNode with the 2d-renderer.
imageGraphics.paint(graphics);
// Create and return a iText Image element that contains the SVG
// image.
return new ImgTemplate(template);
} catch (BadElementException e) {
throw new RuntimeException("Couldn't generate PDF from SVG", e);
} finally {
// Manual cleaning (optional)
graphics.dispose();
}
}
/**
* Use Batik SVG Toolkit to create GraphicsNode for the target SVG.
* <ol>
* <li>Create SVGDocument</li>
* <li>Create BridgeContext</li>
* <li>Build GVT tree. Results to GraphicsNode</li>
* </ol>
*
* #param svg
* SVG as a String
* #return GraphicsNode
* #throws IOException
* Thrown when SVG could not be read properly.
*/
private GraphicsNode buildBatikGraphicsNode(String svg) throws IOException {
UserAgent agent = new UserAgentAdapter();
SVGDocument svgdoc = createSVGDocument(svg, agent);
DocumentLoader loader = new DocumentLoader(agent);
BridgeContext bridgeContext = new BridgeContext(agent, loader);
bridgeContext.setDynamicState(BridgeContext.STATIC);
GVTBuilder builder = new GVTBuilder();
GraphicsNode imageGraphics = builder.build(bridgeContext, svgdoc);
return imageGraphics;
}
private SVGDocument createSVGDocument(String svg, UserAgent agent)
throws IOException {
SVGDocumentFactory documentFactory = new SAXSVGDocumentFactory(
agent.getXMLParserClassName(), true);
SVGDocument svgdoc = documentFactory.createSVGDocument(null,
new StringReader(svg));
return svgdoc;
}
private Image createSvgImage(PdfContentByte contentByte,
float maxPointWidth, float maxPointHeight) throws IOException {
Image image = drawUnscaledSvg(contentByte);
image.scaleToFit(maxPointWidth, maxPointHeight);
return image;
}
}
But when I do this, I still get the small graph. I tried debugging the app, and the size og the graph is actually 10000x600, and then it tries to scale it to fit.
So I tried manually setting the size to like 400x600, no dice. I tried forcing the size on the SVG - no dice. And if I make it, I think, too big then it simply shows a small 1x1cm box with shadows. The output from the example is as follows.
I really hope someone can help.
UPDATE
When I remove these two lines:
Rectangle2D bounds = imageGraphics.getBounds();
graphics.translate(-bounds.getX(), -bounds.getY());
and hardcode the sizes, It kinda works. But the image itself is stil enourmous, and can't seem to fit it.
see for example:
I am have a bit of a problem converting some color PDFs to tiff images. The PDFs I am having problems with have hand written signatures written in blue ink. These signatures do not appear in the generated binary tiffs. I suspect there is a threshold value somewhere to determine which pixels will be black and which will be white.
#SuppressWarnings("serial")
private static void convertPdfToTiff(final File pdf, final File tif) throws Exception {
try
{
final Iterator<ImageWriter> imageWriterIterator = ImageIO.getImageWritersByFormatName("TIF");
final ImageWriter imageWriter = imageWriterIterator.hasNext() ? imageWriterIterator.next() : null;
final TIFFImageWriteParam writeParam = new TIFFImageWriteParam(Locale.getDefault());
writeParam.setCompressionMode(TIFFImageWriteParam.MODE_EXPLICIT);
writeParam.setCompressionType("LZW");
PDDocument pdfDocument = PDDocument.load(pdf);
PDFRenderer pdfRenderer = new PDFRenderer(pdfDocument);
OutputStream out = new FileOutputStream(tif);
final BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(out);
final ImageOutputStream imageOutputStream = ImageIO.createImageOutputStream(bufferedOutputStream);
imageWriter.setOutput(imageOutputStream);
imageWriter.prepareWriteSequence(null);
int pageCounter = 0;
for (PDPage page : pdfDocument.getPages())
{
BufferedImage image = pdfRenderer.renderImageWithDPI(pageCounter, 300, ImageType.BINARY);
final IIOImage s = new IIOImage(image, null, new TIFFImageMetadata(new TIFFIFD(new Vector<BaselineTIFFTagSet>()
{
{
add(BaselineTIFFTagSet.getInstance());
}
})))
{
{
final TIFFImageMetadata tiffMetadata = (TIFFImageMetadata) getMetadata();
final TIFFIFD rootIFD = tiffMetadata.getRootIFD();
final BaselineTIFFTagSet base = BaselineTIFFTagSet.getInstance();
rootIFD.addTIFFField(new TIFFField(base.getTag(BaselineTIFFTagSet.TAG_X_RESOLUTION), TIFFTag.TIFF_RATIONAL, 1, new long[][] { { 300, 1 } }));
rootIFD.addTIFFField(new TIFFField(base.getTag(BaselineTIFFTagSet.TAG_Y_RESOLUTION), TIFFTag.TIFF_RATIONAL, 1, new long[][] { { 300, 1 } }));
}
};
imageWriter.writeToSequence(s, writeParam);
pageCounter++;
}
imageWriter.dispose();
imageOutputStream.flush();
imageOutputStream.close();
bufferedOutputStream.flush();
bufferedOutputStream.close();
pdfDocument.close();
out.flush();
out.close();
}
catch (Exception e)
{
e.printStackTrace();
throw e;
}
}
I had the same problem (blue signatures) some time ago and I did this:
render to RGB
convert to b/w with a filter from JH Labs (I got pointed to this by a comment in this answer)
I initially tried the dither and the diffusion filter
the filter that worked best for me was the bias part (I think I used 0.3) of the gain filter combined with the diffusion filter.
you can combine two filters with the compound filter.
the jhlabs stuff is not available as .jar file, but you can download the sources and add it to your project
some examples
Btw, save your files not as LZW, but as G4, that'll make them smaller. PDFBox has methods to efficiently save into images, see here. ImageIOUtil.writeImage() will save to G4 compressed TIFF if your BufferedImage is of type BITONAL.
I ended up rendering the image as grayscale and re drawing it to a second bw image.
#SuppressWarnings("serial")
private static void convertPdfToTiff(final File pdf, final File tif) throws Exception {
try
{
final Iterator<ImageWriter> imageWriterIterator = ImageIO.getImageWritersByFormatName("TIF");
final ImageWriter imageWriter = imageWriterIterator.hasNext() ? imageWriterIterator.next() : null;
final TIFFImageWriteParam writeParam = new TIFFImageWriteParam(Locale.getDefault());
writeParam.setCompressionMode(TIFFImageWriteParam.MODE_EXPLICIT);
writeParam.setCompressionType("CCITT T.6");
PDDocument pdfDocument = PDDocument.load(pdf);
PDFRenderer pdfRenderer = new PDFRenderer(pdfDocument);
OutputStream out = new FileOutputStream(tif);
final BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(out);
final ImageOutputStream imageOutputStream = ImageIO.createImageOutputStream(bufferedOutputStream);
imageWriter.setOutput(imageOutputStream);
imageWriter.prepareWriteSequence(null);
int pageCounter = 0;
for (PDPage page : pdfDocument.getPages())
{
BufferedImage image = pdfRenderer.renderImageWithDPI(pageCounter, 300, ImageType.GRAY);
BufferedImage image2 = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_BYTE_BINARY);
Graphics2D g = image2.createGraphics();
g.drawRenderedImage(image, null);
g.dispose();
final IIOImage s = new IIOImage(image2, null, new TIFFImageMetadata(new TIFFIFD(new Vector<BaselineTIFFTagSet>()
{
{
add(BaselineTIFFTagSet.getInstance());
}
})))
{
{
final TIFFImageMetadata tiffMetadata = (TIFFImageMetadata) getMetadata();
final TIFFIFD rootIFD = tiffMetadata.getRootIFD();
final BaselineTIFFTagSet base = BaselineTIFFTagSet.getInstance();
rootIFD.addTIFFField(new TIFFField(base.getTag(BaselineTIFFTagSet.TAG_X_RESOLUTION), TIFFTag.TIFF_RATIONAL, 1, new long[][] { { 300, 1 } }));
rootIFD.addTIFFField(new TIFFField(base.getTag(BaselineTIFFTagSet.TAG_Y_RESOLUTION), TIFFTag.TIFF_RATIONAL, 1, new long[][] { { 300, 1 } }));
}
};
imageWriter.writeToSequence(s, writeParam);
pageCounter++;
}
imageWriter.dispose();
imageOutputStream.flush();
imageOutputStream.close();
bufferedOutputStream.flush();
bufferedOutputStream.close();
pdfDocument.close();
out.flush();
out.close();
}
catch (Exception e)
{
e.printStackTrace();
throw e;
}
}
Anyone can help in this code, the pdf file is not loading in app and just showing blank white screen, Logcat showing FileNotFoundExeeption: /storage/sdcard/raw/ourpdf.pdf.
i am trying to make an app that will show information while i click buttons and every button will be active for specific pdf file reading. Any specific help please.
Thanks for help
part1
package com.code.androidpdf;
public class MainActivity extends Activity {
//Globals:
private WebView wv;
private int ViewSize = 0;
//OnCreate Method:
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Settings
PDFImage.sShowImages = true; // show images
PDFPaint.s_doAntiAlias = true; // make text smooth
HardReference.sKeepCaches = true; // save images in cache
//Setup above
wv = (WebView)findViewById(R.id.webView1);
wv.getSettings().setBuiltInZoomControls(true);//show zoom buttons
wv.getSettings().setSupportZoom(true);//allow zoom
//get the width of the webview
wv.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener()
{
#Override
public void onGlobalLayout()
{
ViewSize = wv.getWidth();
wv.getViewTreeObserver().removeGlobalOnLayoutListener(this);
}
});
pdfLoadImages();//load images
}
private void pdfLoadImages() {
try
{
// run async
new AsyncTask<Void, Void, Void>()
{
// create and show a progress dialog
ProgressDialog progressDialog = ProgressDialog.show(MainActivity.this, "", "Opening...");
#Override
protected void onPostExecute(Void result)
{
//after async close progress dialog
progressDialog.dismiss();
}
#Override
protected Void doInBackground(Void... params)
{
try
{
// select a document and get bytes
File file = new File(Environment.getExternalStorageDirectory().getPath()+"/randompdf.pdf");
RandomAccessFile raf = new RandomAccessFile(file, "r");
FileChannel channel = raf.getChannel();
net.sf.andpdf.nio.ByteBuffer bb = null ;
raf.close();
// create a pdf doc
PDFFile pdf = new PDFFile(bb);
//Get the first page from the pdf doc
PDFPage PDFpage = pdf.getPage(1, true);
//create a scaling value according to the WebView Width
final float scale = ViewSize / PDFpage.getWidth() * 0.95f;
//convert the page into a bitmap with a scaling value
Bitmap page = PDFpage.getImage((int)(PDFpage.getWidth() * scale), (int)(PDFpage.getHeight() * scale), null, true, true);
//save the bitmap to a byte array
ByteArrayOutputStream stream = new ByteArrayOutputStream();
page.compress(Bitmap.CompressFormat.PNG, 100, stream);
stream.close();
byte[] byteArray = stream.toByteArray();
//convert the byte array to a base64 string
String base64 = Base64.encodeToString(byteArray, Base64.DEFAULT);
//create the html + add the first image to the html
String html = "<!DOCTYPE html><html><body bgcolor=\"#7f7f7f\"><img src=\"data:image/png;base64,"+base64+"\" hspace=10 vspace=10><br>";
//loop through the rest of the pages and repeat the above
for(int i = 2; i <= pdf.getNumPages(); i++)
{
PDFpage = pdf.getPage(i, true);
page = PDFpage.getImage((int)(PDFpage.getWidth() * scale), (int)(PDFpage.getHeight() * scale), null, true, true);
stream = new ByteArrayOutputStream();
page.compress(Bitmap.CompressFormat.PNG, 100, stream);
stream.close();
byteArray = stream.toByteArray();
base64 = Base64.encodeToString(byteArray, Base64.DEFAULT);
html += "<img src=\"data:image/png;base64,"+base64+"\" hspace=10 vspace=10><br>";
}
html += "</body></html>";
//load the html in the webview
wv.loadDataWithBaseURL("", html, "text/html","UTF-8", "");
}
catch (Exception e)
{
Log.d("CounterA", e.toString());
}
return null;
}
}.execute();
System.gc();// run GC
}
catch (Exception e)
{
Log.d("error", e.toString());
}
}
}
It is (sadly) not possible to view a PDF that is stored locally in your devices. Android L has introduced the feature. So, to display a PDF , you have two options:
See this answer for using webview
How to open local pdf file in webview in android? (note that this requires an internet connection)
Use a third party pdf Viewer.
You can also send an intent for other apps to handle your pdf.
You can get an InputStream for the file using
getResources().openRawResource(R.raw.ourpdf)
Docs: http://developer.android.com/reference/android/content/res/Resources.html#openRawResource(int)