Convert Text to PDF

Aspose.PDF for Android via Java provides the capability to convert Text files to PDF format. In this article, we demonstrate how easily and efficiently we can convert a text file to PDF using Aspose.PDF.

When you need to convert a Text file to PDF, initially read the source text file in some reader. We have used StringBuilder to read the Text file contents. Instantiate Document object and add a new page in the Pages collection. Create a new object of TextFragment and pass StringBuilder object to its constructor. Add a new paragraph in Paragraphs collection using TextFragment object and save the resultant PDF file using the Save method of Document class.

Convert plain text file to PDF

public void convertTXTtoPDF_Simple () {
        // Initialize document object

        File pdfDocumentFileName=new File(fileStorage, "demo_txt.pdf");
        File txtDocumentFileName=new File(fileStorage, "Conversion/rfc822.txt");

        // Instantiate a Document object by calling its empty constructor
        document=new Document();

        // Add a new page in Pages collection of Document
        Page page=document.getPages().add();

        String string;
        StringBuilder stringBuilder=new StringBuilder();
        InputStream is;
        try {
            is=new FileInputStream(txtDocumentFileName);
        } catch (FileNotFoundException e) {
            resultMessage.setText(e.getMessage());
            return;
        }
        BufferedReader reader=new BufferedReader(new InputStreamReader(is));
        while (true) {
            try {
                if ((string=reader.readLine()) == null) break;
            } catch (IOException e) {
                resultMessage.setText(e.getMessage());
                return;
            }
            stringBuilder.append(string).append("\n");
        }
        try {
            is.close();
        } catch (IOException e) {
            resultMessage.setText(e.getMessage());
            return;
        }


        // Create an instance of TextFragment and pass the text from reader object to its
        // constructor as argument
        TextFragment text=new TextFragment(stringBuilder.toString());

        // Add a new text paragraph in paragraphs collection and pass the TextFragment
        // object
        page.getParagraphs().add(text);

        // Save resultant PDF file
        try {
            document.save(pdfDocumentFileName.toString());
        } catch (Exception e) {
            resultMessage.setText(e.getMessage());
            return;
        }
        resultMessage.setText(R.string.success_message);
    }

Convert pre-formatted text file to PDF

    public void convertPreFormattedTextToPdf () {

        File txtDocumentFile=new File(fileStorage, "Conversion/rfc822.txt");
        File pdfDocumentFileName=new File(fileStorage, "demo_txt.pdf");
        Path txtDocumentFileName=Paths.get(txtDocumentFile.toString());

        // Read the text file as array of string
        List<String> lines;
        try {
            lines=Files.readAllLines(txtDocumentFileName, ENCODING);
        } catch (IOException e) {
            resultMessage.setText(e.getMessage());
            return;
        }

        // Instantiate a Document object by calling its empty constructor
        document=new Document();

        // Add a new page in Pages collection of Document
        Page page=document.getPages().add();
        int count=4;

        Font font=FontRepository.findFont("Droid Sans Mono");
        // Set left and right margins for better presentation
        page.getPageInfo().getMargin().setLeft(20);
        page.getPageInfo().getMargin().setRight(10);
        page.getPageInfo().getDefaultTextState().setFont(font);
        page.getPageInfo().getDefaultTextState().setFontSize(12);

        for (String line : lines) {
            // check if line contains "form feed" character
            // see https://en.wikipedia.org/wiki/Page_break
            if (line.startsWith("\f")) {
                page=document.getPages().add();
                page.getPageInfo().getMargin().setLeft(20);
                page.getPageInfo().getMargin().setRight(10);
                page.getPageInfo().getDefaultTextState().setFont(font);
                page.getPageInfo().getDefaultTextState().setFontSize(12);
            } else {
                // Create an instance of TextFragment and
                // pass the line to its
                // constructor as argument
                TextFragment text=new TextFragment(line);

                // Add a new text paragraph in paragraphs collection and pass the TextFragment
                // object
                page.getParagraphs().add(text);
            }
        }
        // Save resultant PDF file
        try {
            document.save(pdfDocumentFileName.toString());
        } catch (Exception e) {
            resultMessage.setText(e.getMessage());
            return;
        }
        resultMessage.setText(R.string.success_message);
    }
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