How to select a specific element from an XML file?

Question

Android

There is an XML file voprosi.xml

<?xml version="1.0" encoding="utf-8"?>
    <questions>
    <question>
        <vopros>Сколько будет 2+2?</vopros>
        <otvet_1>2</otvet_1>
        <otvet_2>6</otvet_2>
        <otvet_3>8</otvet_3>
        <otvet_4  name="pravilno">4</otvet_4>
    </question>
    <question>
        <vopros>Сколько будет 3+3?</vopros>
        <otvet_1>12</otvet_1>
        <otvet_2>16</otvet_2>
        <otvet_3>18</otvet_3>
        <otvet_4  name="pravilno">6</otvet_4>
    </question>
    <question>
        <vopros>Сколько будет 4+4?</vopros>
        <otvet_1>22</otvet_1>
        <otvet_2>26</otvet_2>
        <otvet_3>18</otvet_3>
        <otvet_4  name="pravilno">8</otvet_4>
    </question>
    <question>
        <vopros>Сколько будет 5+5?</vopros>
        <otvet_1>2</otvet_1>
        <otvet_2>6</otvet_2>
        <otvet_3>8</otvet_3>
        <otvet_4  name="pravilno">10</otvet_4>
    </question>
</questions>

I need to display in the activity Question 3 and the answer options
Java code that receives data from the XML file

try {
            XmlPullParser parser = getResources().getXml(R.xml.voprosi);

            while (parser.getEventType() != XmlPullParser.END_DOCUMENT) {
                if (parser.getEventType() == XmlPullParser.START_TAG
                        && parser.getName().equals("question")) {
                    
if(numvopr==3)
{

//....... тут надо вывести как-то вопрос и ответы 

 }
                  numvopr++;
                }
                parser.next();
            }


        } catch (Throwable t) {
            Toast.makeText(this,
                    "Ошибка при загрузке XML-документа: " + t.toString(),
                    Toast.LENGTH_LONG).show();
        }

Perhaps you can display the data so as not to parse the entire file, but only by the element number?

Answer 1

with a strong desire - you can, if you go to the block structure of the file,
i.e. when each tag <question>occupies strictly N bytes (the rest can be padded with spaces)
then the required block is found in one step: block number * N
but in a real project they will beat for this and not only on the hands -
there is a parser, there are objects, parsed - got the solution valuable for its predictability and ease of maintenance
PS: <otvet_1>12</otvet_1>it is better not to show view tags to anyone else,
like this it will be correct:

<question id="1" text="Сколько будет 4+4?" > - внесем вопрос в аттрибуты чтобы упростить парсинг
<item id="1" right="true">8</item>
<item id="2" >44</item>