Add, Delete or Get Attachments from PDF Document in Android & Java Apps

This technical tip shows how to work with attachment in a PDF document using Aspose.Pdf. Developers can add, delete, get attachment from a PDF file. In order to add attachment in a PDF document, you need to create a FileSpecification object with the file, which needs to be added, and the file description. After that the FileSpecification object can be added to EmbeddedFiles collection of Document object using add(..) method of EmbeddedFiles collection. The EmbeddedFiles collection contains all the attachments added in the PDF file.
The following code snippet shows you how to add attachment in a PDF document.

//open document
com.aspose.pdf.Document pdfDocument = new com.aspose.pdf.Document("/mnt/sdcard/input.pdf");
//setup new file to be added as attachment
com.aspose.pdf.FileSpecification fileSpecification = new com.aspose.pdf.FileSpecification("/mnt/sdcard/sample.txt", "Sample text file");
//add attachment to document's attachment collection
pdfDocument.getEmbeddedFiles().add(fileSpecification);
// Save updated document containing table object
pdfDocument.save("/mnt/sdcard/output.pdf");

The following code snippet shows you how to delete all the attachments from the PDF document.

//open document
com.aspose.pdf.Document pdfDocument = new com.aspose.pdf.Document("/mnt/sdcard/input.pdf");
//delete all attachments
pdfDocument.getEmbeddedFiles().delete();
//save updated file
pdfDocument.save("/mnt/sdcard/output.pdf");

The following code snippet shows you how to get an individual attachment from the PDF document.

//open document
com.aspose.pdf.Document pdfDocument = new com.aspose.pdf.Document("/mnt/sdcard/input.pdf");

//get particular embedded file
com.aspose.pdf.FileSpecification fileSpecification = pdfDocument.getEmbeddedFiles().get_Item(1);
//get the file properties
System.out.printf("Name: - " + fileSpecification.getName());
System.out.printf("\nDescription: - " + fileSpecification.getDescription());
System.out.printf("\nMime Type: - " + fileSpecification.getMIMEType());
// get attachment form PDF file
try {
    InputStream input = fileSpecification.getContents();
    File file = new File(fileSpecification.getName());
    // create path for file from pdf
    file.getParentFile().mkdirs();
    // create and extract file from pdf
    java.io.FileOutputStream output = new java.io.FileOutputStream("/mnt/sdcard/"+fileSpecification.getName(), true);
    byte[] buffer = new byte[4096];
    int n = 0;
    while (-1 != (n = input.read(buffer)))
    output.write(buffer, 0, n);

    // close InputStream object
    input.close();
    output.close();
} catch (IOException e) {
e.printStackTrace();
}
// close Document object
pdfDocument.dispose();

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.

Read more about Aspose.Pdf for Android