获取下Jsoup元素同名的Andr​​oid [英] Get Next Jsoup Element with Same Name Android

问题描述

我retreving与Jsoup Android中的元素。我需要从这个code下一ETA元素。我不知道怎么样。我retreiving从XML：<一href=\"http://lapi.transitchicago.com/api/1.0/ttarrivals.aspx?key=201412abc85d49b2b83f907f9e329eaa&mapid=40380\" rel=\"nofollow\">http://lapi.transitchicago.com/api/1.0/ttarrivals.aspx?key=201412abc85d49b2b83f907f9e329eaa&mapid=40380.有人提出了用elem.iterator（），但我不知道如何把这个在我的code（这是它的网站）的 http://www.jsoup.org/apidocs/org/jsoup/select/Elements.html#iterator（）我的code如下。

I'm retreving elements in Android with Jsoup. I need to get the next eta element from this code. I'm not sure how to. I'm retreiving the xml from: http://lapi.transitchicago.com/api/1.0/ttarrivals.aspx?key=201412abc85d49b2b83f907f9e329eaa&mapid=40380. Someone has brought up using elem.iterator(), but I'm not sure how to put this in my code (this is the website for it)http://www.jsoup.org/apidocs/org/jsoup/select/Elements.html#iterator() My code is below.

TestStation.java

TestStation.java

public class TestStation extends Activity {
String URL = "http://lapi.transitchicago.com/api/1.0/ttarrivals.aspx?key=201412abc85d49b2b83f907f9e329eaa&mapid=40380";
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
        setContentView(R.layout.test_station);
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy); 



Document doc = null;

TextView tv = (TextView) findViewById(R.id.tv);
TextView tv1 = (TextView) findViewById(R.id.tv1);
TextView tv2 = (TextView) findViewById(R.id.tv2);
TextView tv3 = (TextView) findViewById(R.id.tv3);
TextView tv4 = (TextView) findViewById(R.id.tv4);
TextView tv5 = (TextView) findViewById(R.id.tv5);

try {
    doc = Jsoup.connect(URL).userAgent("Mozilla/5.0 (Macintosh; U; Intel Mac OS X; de-de) AppleWebKit/523.10.3 (KHTML, like Gecko) Version/3.0.4 Safari/523.10").get();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
    Iterator<Element> iterator = elem.iterator();
while(iterator.hasNext())
{ Element div = iterator.next();

Elements arrT = div.select("arrT");
Elements prdt = div.select("prdt");
Elements staNm = div.select("staNm");
String StaNm = staNm.text();
tv1.setText(String.valueOf (StaNm));


while(iterator.hasNext())
{ Element div1 = iterator.next();

Elements arrT1 = div1.select("arrT");
Elements prdt1 = div1.select("prdt");
Elements staNm1 = div1.select("staNm");
String StaNm1 = staNm1.text();
tv2.setText(String.valueOf (StaNm1));



try {

    SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HH:mm:ss");
    Date date1 = sdf.parse(arrT.text());
    Date date2 = sdf.parse(prdt.text());
    Date date3 = sdf.parse(arrT1.text());
    Date date4 = sdf.parse(prdt1.text());

    long dateDiff = (date1.getTime() - date2.getTime())>0 ? (date1.getTime() - date2.getTime()) :(date2.getTime() - date1.getTime());
    long dateDiff1 = (date3.getTime() - date4.getTime())>0 ? (date3.getTime() - date4.getTime()) :(date4.getTime() - date3.getTime());
    SimpleDateFormat sdf1 = new SimpleDateFormat("mm:00");
    String dateDif = sdf1.format(dateDiff);
    String dateDif1 = sdf1.format(dateDiff1);
    tv.setText(String.valueOf (dateDif));
    tv3.setText(String.valueOf (dateDif1));


    }

catch (ParseException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();



 }

}
}
}

我现在越来越LogCat中的错误，它说，它已停止工作：

I'm now getting LogCat errors, and it says that it has stopped working:

09-26 20:34:50.456: E/AndroidRuntime(22691): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dev.chicagotraintracker/com.dev.chicagotraintracker.TestStation}: java.lang.NullPointerException
09-26 20:34:50.456: E/AndroidRuntime(22691):    at com.dev.chicagotraintracker.TestStation.onCreate(TestStation.java:57)

使用我的code，我得到两个元素，但它们是完全一样的。我得到DATEDIFF和dateDiff1相同的号码。我怎样才能获得具有相同名称的下一个埃塔元素？谢谢你的帮助。

With my code, I get two elements, but they are the exact same. I get the same numbers for dateDiff and dateDiff1. How can I get the next eta element with the same name? Thank you for your help.

推荐答案

所以，如果我理解正确的话，这可能会帮助您：

So if I understood correctly, this might help you:

Elements elem = doc.select("eta");
Iterator<Element> iterator = elem.iterator();
while(iterator.hasNext()) {
    Element etaElement = iterator.next();
    Element arrT = etaElement.select("arrT");    
    Element prdt = etaElement.select("prdt");
    //  1. parse the arrT value
    //  2. parse the prdt value
    //  3. subtract them.
}

这样你就可以单独处理每个条目。请注意，在 div.select 被用于每个 ETA 元素，而不是从整个文件，作为你的code在做什么。

Like this you will be able to individually handle each entry. Note the the div.select is being used for each eta element and not from the whole document, as your code was doing.

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