How to Convert Memory Stream Image to PDF inside Android Applications

This technical tip shows how developers can convert Memory Stream image to PDF file inside their Android application. The Image class in Aspose.Pdf makes it possible to convert an image from various sources into PDF format. This may include an image from particular location over the hard-drive, an image from MemoryStream or an image at a web location. The ImageInfo class has a method named setMemoryData() which is used to specify MemoryStream as the image source. 

The following code snippet shows you how convert Memory Stream image to PDF file.

try {

     // Create PDF document
     Pdf pdf = new Pdf();

     // Add a section into the PDF document
     Section sec1 = pdf.getSections().add();

     byte[] fileArray = null;

     //=====================================================//
     // Get the Image contents into Byte Array
     //=====================================================//

     try {
            fileArray = getBytesFromFile(new File("/mnt/sdcard/Aspose.jpg"));
         } catch (IOException e) {
            e.printStackTrace();
         }

     // Create an image object in the section
     aspose.pdf.Image img1 = new aspose.pdf.Image(sec1);

     // Add image object into the Paragraphs collection of the section
     sec1.getParagraphs().add(img1);

     // Set the Image file type
     img1.getImageInfo().setImageFileType(ImageFileType.Jpeg);

     // Create a BinayFileStream Object to hold byte array
     BinaryFileStream bstream = new BinaryFileStream(fileArray);
     // Set the image object to use BinaySgtream object
     img1.getImageInfo().setImageStream(bstream);

     // Save the PDF file
     pdf.save("/mnt/sdcard/Image2PDF.pdf");

}catch(java.io.IOException ioe){
                               System.out.println(ioe.getMessage());
              }catch(Exception e){
                               System.out.println(e.getMessage());
              }
}

        //=====================================================//
        // Method Returns the contents of file in a byte array
        //=====================================================//

        private static byte[] getBytesFromFile(File file) throws IOException {

        InputStream is = new FileInputStream(file);

        // Get the size of the file
        long length = file.length();

        /*
         * Ensure that file is not loarger than Integer.MAX_VALUE;
         */

        if (length > Integer.MAX_VALUE) {
            System.out.println("File is too large to process");
            return null;
        }

        // Create the byte array to hold the data
        byte[] bytes = new byte[(int)length];

        // Read in the bytes
        int offset = 0;
        int numRead = 0;
        while ( (offset < bytes.length)
                &&
                ( (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) ) {

            offset += numRead;

        }

        // Ensure all the bytes have been read in
        if (offset < bytes.length) {
            throw new IOException("Could not completely read file " + file.getName());
        }

        is.close();
        return bytes;

        }

Overview: Aspose.Pdf for Android

Aspose.Pdf for Android is a PDF document creation & manipulation component that enables Android applications to read, write & manipulate PDF document without using any other third party application. It allows PDF compression options, table creation & manipulation, support for graph objects, extended security controls, custom font handling, add or remove bookmarks, create table of contents, add, update, delete attachments & annotations, import or export PDF form data, print PDF docs &  much more.

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