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我試圖將this xml file加載到Android應用程序中。我得到了一切工作，但由於某種原因，我無法加載id。 我一直在谷歌搜索，發現我應該使用parser.getattribute(null,"id"); ，但由於某種原因，它不斷返回null。我也嘗試過parser.getattribute(0);和parser.getattribute(3);，它給了我一個越界異常，但是當我通過程序進行調試並查看解析器類時，值始終包含id。Android XML解析器無法獲取屬性
這是一個簡單的修復，但有沒有人有我如何訪問每個數據集的ID的想法？ 我沒有問題，得到的volume，avg，max，min，stddec，median，percentile的值，但我需要的id也。
這裏是我的XML文件閱讀器類：
public class EveCentralRead {
static final String KEY_SITE = "type";
static final String KEY_volume ="volume";
static final String KEY_avg = "avg";
static final String KEY_max ="max";
static final String KEY_min ="min";
static final String KEY_stddev = "stddev";
static final String KEY_median = "median";
static final String KEY_precentile ="percentile";
static final String KEY_typeID = "type";
public static List<EveCentralHolder> getEveCentralDataFromXML(Context ctx) {
// List of StackSites that we will return
List<EveCentralHolder> stackSites;
stackSites = new ArrayList<EveCentralHolder>();
// temp holder for current StackSite while parsing
EveCentralHolder curStackSite = null;
// temp holder for current text value while parsing
String curText = "";
try {
// Get our factory and PullParser
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser xpp = factory.newPullParser();
// Open up InputStream and Reader of our file.
File file = new File(MainActivity.MainDir+"/prices.xml");
InputStream fis = new FileInputStream(file.getPath());
BufferedReader reader = new BufferedReader(new InputStreamReader(fis));
// point the parser to our file.
xpp.setInput(reader);
// get initial eventType
int eventType = xpp.getEventType();
// Loop through pull events until we reach END_DOCUMENT
boolean getdata = false;
while (eventType != XmlPullParser.END_DOCUMENT) {
// Get the current tag
String tagname = xpp.getName();
// React to different event types appropriately
switch (eventType) {
case XmlPullParser.START_TAG:
// Log.d("hej",tagname);
if(tagname.equalsIgnoreCase(KEY_typeID)){
curStackSite = new EveCentralHolder();
curStackSite.setTypeID(xpp.getAttributeValue(null,"id"));
}
if(tagname.equalsIgnoreCase("sell")){
getdata = true;
curStackSite = new EveCentralHolder();
}
break;
case XmlPullParser.TEXT:
curText = xpp.getText();
if(getdata) {
curText = xpp.getText();
// Log.d("hej", "" + xpp.getText());
}
break;
case XmlPullParser.END_TAG:
// Log.d("hej",tagname);
if (tagname.equalsIgnoreCase("sell")) {
getdata = false;
}
if (tagname.equalsIgnoreCase(KEY_SITE)) {
stackSites.add(curStackSite);
}
if(getdata){
if (tagname.equalsIgnoreCase(KEY_volume)) {
curStackSite.setTypeID(xpp.getAttributeValue(null,"id"));
curStackSite.setVolume(curText);
} else if (tagname.equalsIgnoreCase(KEY_avg)) {
curStackSite.setAvg(curText);
} else if (tagname.equalsIgnoreCase(KEY_max)) {
curStackSite.setMax(curText);
} else if (tagname.equalsIgnoreCase(KEY_min)) {
curStackSite.setMin(curText);
}else if (tagname.equalsIgnoreCase(KEY_stddev)) {
curStackSite.setStddev(curText);
}else if (tagname.equalsIgnoreCase(KEY_precentile)) {
curStackSite.setPercentile(curText);
}
}
break;
default:
break;
}
//move on to next iteration
eventType = xpp.next();
}
} catch (Exception e) {
e.printStackTrace();
}
// return the populated list.
return stackSites;
}
}
這裏是我的XML文件：
<evec_api version="2.0" method="marketstat_xml">
<marketstat>
<type id="34">
<buy>
<volume>46278278835</volume>
<avg>6.02</avg>
<max>6.44</max>
<min>2.96</min>
<stddev>0.62</stddev>
<median>6.22</median>
<percentile>6.43</percentile>
</buy>
<sell>
<volume>12569824799</volume>
<avg>6.64</avg>
<max>8.85</max>
<min>6.47</min>
<stddev>0.46</stddev>
<median>6.53</median>
<percentile>6.49</percentile>
</sell>
<all>
<volume>58848103634</volume>
<avg>6.15</avg>
<max>8.85</max>
<min>2.96</min>
<stddev>0.75</stddev>
<median>6.34</median>
<percentile>4.60</percentile>
</all>
</type>
<type id="35">
<buy>
<volume>3893959033</volume>
<avg>11.40</avg>
<max>11.90</max>
<min>7.05</min>
<stddev>1.01</stddev>
<median>11.71</median>
<percentile>11.89</percentile>
</buy>
<sell>
<volume>9116786204</volume>
<avg>13.45</avg>
<max>17.41</max>
<min>11.98</min>
<stddev>0.96</stddev>
<median>12.30</median>
<percentile>12.01</percentile>
</sell>
<all>
<volume>13010745237</volume>
<avg>12.83</avg>
<max>17.41</max>
<min>7.05</min>
<stddev>1.10</stddev>
<median>12.09</median>
<percentile>10.42</percentile>
</all>
</type>
<type id="36">
<buy>
<volume>1287271345</volume>
<avg>44.36</avg>
<max>47.85</max>
<min>23.10</min>
<stddev>5.34</stddev>
<median>47.06</median>
<percentile>47.80</percentile>
</buy>
<sell>
<volume>3753914760</volume>
<avg>56.10</avg>
<max>66.51</max>
<min>48.87</min>
<stddev>4.97</stddev>
<median>54.00</median>
<percentile>49.09</percentile>
</sell>
<all>
<volume>5041186105</volume>
<avg>53.10</avg>
<max>66.51</max>
<min>23.10</min>
<stddev>5.86</stddev>
<median>50.74</median>
<percentile>37.13</percentile>
</all>
</type>
<type id="37">
<buy>
<volume>260386951</volume>
<avg>122.15</avg>
<max>130.02</max>
<min>73.50</min>
<stddev>14.82</stddev>
<median>128.77</median>
<percentile>130.01</percentile>
</buy>
<sell>
<volume>721404372</volume>
<avg>149.07</avg>
<max>215.00</max>
<min>132.00</min>
<stddev>16.06</stddev>
<median>141.37</median>
<percentile>132.75</percentile>
</sell>
<all>
<volume>981791323</volume>
<avg>141.93</avg>
<max>215.00</max>
<min>73.50</min>
<stddev>17.79</stddev>
<median>140.00</median>
<percentile>98.15</percentile>
</all>
</type>
<type id="38">
<buy>
<volume>67805138</volume>
<avg>701.02</avg>
<max>726.00</max>
<min>436.11</min>
<stddev>92.94</stddev>
<median>715.30</median>
<percentile>722.45</percentile>
</buy>
<sell>
<volume>254352194</volume>
<avg>792.02</avg>
<max>1227.41</max>
<min>728.95</min>
<stddev>78.64</stddev>
<median>757.27</median>
<percentile>729.99</percentile>
</sell>
<all>
<volume>322157332</volume>
<avg>772.86</avg>
<max>1227.41</max>
<min>436.11</min>
<stddev>86.94</stddev>
<median>740.90</median>
<percentile>644.00</percentile>
</all>
</type>
<type id="39">
<buy>
<volume>27385528</volume>
<avg>594.54</avg>
<max>654.94</max>
<min>401.00</min>
<stddev>77.95</stddev>
<median>580.03</median>
<percentile>654.91</percentile>
</buy>
<sell>
<volume>308516889</volume>
<avg>973.62</avg>
<max>1599.92</max>
<min>681.96</min>
<stddev>181.14</stddev>
<median>779.83</median>
<percentile>682.79</percentile>
</sell>
<all>
<volume>338902417</volume>
<avg>934.45</avg>
<max>1599.92</max>
<min>7.30</min>
<stddev>218.01</stddev>
<median>760.00</median>
<percentile>456.32</percentile>
</all>
</type>
<type id="40">
<buy>
<volume>14578614</volume>
<avg>1090.66</avg>
<max>1481.00</max>
<min>500.00</min>
<stddev>340.57</stddev>
<median>1387.51</median>
<percentile>1480.15</percentile>
</buy>
<sell>
<volume>170054750</volume>
<avg>2496.43</avg>
<max>3899.91</max>
<min>1498.99</min>
<stddev>689.33</stddev>
<median>2222.44</median>
<percentile>1514.55</percentile>
</sell>
<all>
<volume>194933364</volume>
<avg>2259.76</avg>
<max>3899.91</max>
<min>5.00</min>
<stddev>733.71</stddev>
<median>1950.92</median>
<percentile>6.94</percentile>
</all>
</type>
</marketstat>
</evec_api>
getAttributeValue（null，「id」）的兩個實例都失敗了，還是隻有當您到達END_TAG時調用它的那個？ – bstar55
都失敗了我托盤失敗的每一件事 – fantazituborg