我如何在android中解析PDF文件？

Question

I am developing android application. This application allows the user to highlight words in PDF file. Then these words must be extracted, so how can I parse the PDF file to get extracted words from the file without any library? Can any one help me?

Answer 1

You have to code it yourself if you don't want to use a libary. There isn't any build-in classes in Android SDK for PDF manipulation.

However you have to use a Libary and have a look at this question:

PDF Library to rendering the PDF files in Android

Answer 2

You can parse PDF easily on android easily using the iText library as like I've done it on my project by parsing a pdf file from assets and displaying it in the android listview.

iTextG Link: https://developers.itextpdf.com/itextg-android

assetManager = getAssets();

try{
    InputStream inputStream = assetManager.open("sample.pdf");
    String parsedText = "";
    PdfReader reader = new PdfReader(inputStream);
    int n = reader.getNumberOfPages();

    for (int i = 0; i < n; i++)
        parsedText = parsedText + PdfTextExtractor.getTextFromPage(reader, i + 1).trim() + "\n";

    String[] data = parsedText.split("\n");

    for(String d : data){
        patients.add(d);
    }

    reader.close();

}catch (FileNotFoundException e){
    Toast.makeText(this, "File Not Found", Toast.LENGTH_SHORT).show();
}catch (IOException e){
    Toast.makeText(this, "IO Error reading input stream", Toast.LENGTH_SHORT).show();
}