read file from the assets folder

Question

I have a large text file that is in the assets folder, and I have a button that reads the file's next line successfully. However, I want to read the previous line in case the user clicks another button.

Reading the whole file to memory is not an option. The file lines are not numbered.

Answer 1

InputStream is = getResources().getAssets().open("abc.txt");
String result= convertStreamToString(is);

public static String convertStreamToString(InputStream is)
            throws IOException {
            Writer writer = new StringWriter();
        char[] buffer = new char[2048];
        try {
            Reader reader = new BufferedReader(new InputStreamReader(is,
                    "UTF-8"));
            int n;
            while ((n = reader.read(buffer)) != -1) {
                writer.write(buffer, 0, n);
            }
        } finally {
            is.close();
        }
        String text = writer.toString();
        return text;
}