Question

i m 采用xmlpullparser in android to parse an xml document that look as:

<top>
  <category>
    <name></name>
    <desc></desc>
    <songs>
      <song>
        <clip></clip>
        <thumb></thumb>
      </song>
      <song>
        <clip></clip>
        <thumb></thumb>
      </song>
    </songs>
  </category>
</top>

我试图这样做:

while (eventType != XmlPullParser.END_DOCUMENT && !done){
                String name = null;
                switch (eventType){
                    case XmlPullParser.START_DOCUMENT:
                        categoriesSong = new ArrayList<TopMousika>();
                        break;
                    case XmlPullParser.START_TAG:
                        name = parser.getName();
                        if (name.equalsIgnoreCase(CATEGORY)){
                            currentCategory = new TopMousika();
                            currentCategory.setId(parser.getAttributeValue(0));
                            currentCategory.setId(parser.getAttributeValue(1));
                        } else if (currentCategory != null){
                            if (name.equalsIgnoreCase(NAME)){
                                currentCategory.setName(parser.nextText());
                            } else if (name.equalsIgnoreCase(DESCRIPTION)){
                                currentCategory.setDescription(parser.nextText());
                            } else if (name.equalsIgnoreCase(THUMBNAIL)){
                                currentCategory.setThumbnail(parser.nextText());
                            } else if (name.equalsIgnoreCase(SONGS)){
                                songs = new ArrayList<SongMousika>();
                                if(name.equalsIgnoreCase(SONG)){
                                    currentSong = new SongMousika();
                                    currentSong.setId(parser.getAttributeValue(0));
                                    Log.d("TEST", "OK");
                                    songs.add(currentSong);
                                } else if (name.equalsIgnoreCase(TITLE)){
                                    Log.d("TEST", "OK2");
                                    currentSong.setTitle(parser.nextText());
                                } else if (name.equalsIgnoreCase(SINGER)){
                                    currentSong.setTitle(parser.nextText());
                                } else if (name.equalsIgnoreCase(THUMBNAIL)){
                                    currentSong.setTitle(parser.nextText());
                                } else if (name.equalsIgnoreCase(PUBLICATION_DATE)){
                                    currentSong.setTitle(parser.nextText());
                                } else if (name.equalsIgnoreCase(CLIP)){
                                    currentSong.setTitle(parser.nextText());
                                }
                                currentCategory.setSongs(songs);
                            }
                        }
                        break;
                    case XmlPullParser.END_TAG:
                        name = parser.getName();
                        if (name.equalsIgnoreCase(CATEGORY) && 
currentCategory != null){
                            currentCategory.setSongs(songs);
                            categoriesSong.add(currentCategory);
                        } else if (name.equalsIgnoreCase(TOP)){
                            done = true;
                        }
                        break;
                }
                eventType = parser.next();
            }

but I can not retrieve my Songs List.

can any one help me please ?

Answer 1

您似乎期待<代码> 姓名在检查之间作出重大改变:

if (name.equalsIgnoreCase(SONGS)) {
    songs = new ArrayList<SongMousika>();
    if(name.equalsIgnoreCase(SONG)) {

如何使用<条码>。。你们需要保留XML,并对每个元素名称作出不同的反应。因此,如果声明在对《第一阶段裁武条约》活动作出反应时没有插手的话,你很可能有<条码>。 (将处理方式推向一种单独的方法可能非常值得。)

EDIT:Okae,因此,你必须使 lo的每 it都只对one tag作出反应。因此,你对开端的处理就好像:

case XmlPullParser.START_TAG: name = parser.getName(); if (name.equalsIgnoreCase(CATEGORY)){ currentCategory = new TopMousika(); currentCategory.setId(parser.getAttributeValue(0)); currentCategory.setId(parser.getAttributeValue(1)); } else if (currentCategory != null) { if (name.equalsIgnoreCase(NAME)){ currentCategory.setName(parser.nextText()); } else if (name.equalsIgnoreCase(DESCRIPTION)){ currentCategory.setDescription(parser.nextText()); } else if (name.equalsIgnoreCase(THUMBNAIL)){ currentCategory.setThumbnail(parser.nextText()); } else if (name.equalsIgnoreCase(SONGS)){ songs = new ArrayList<SongMousika>(); } else if (songs != null) { if(name.equalsIgnoreCase(SONG)) { currentSong = new SongMousika(); currentSong.setId(parser.getAttributeValue(0)); Log.d("TEST", "OK"); songs.add(currentSong); } else if (currentSong != null) { else if (name.equalsIgnoreCase(TITLE)) { Log.d("TEST", "OK2"); currentSong.setTitle(parser.nextText()); } else if (name.equalsIgnoreCase(SINGER)){ currentSong.setSinger(parser.nextText()); } else if (name.equalsIgnoreCase(THUMBNAIL)) // etc } } }

说明在任何途径中,我们从不核对<代码>名称/代码>。具有多重价值观——我们说:

Are we starting a new category?

If so, create it and remember it - then continue with the next iteration.

If not (and if we ve got a category), are we starting a new song list?

If so, create it and remember it - then continue with the next iteration.

If not (and if we ve got a song list), are we starting a new song?

If so, create it and remember it - then continue with the next iteration.

If not (and if we ve got a song)...

Are we reading the title? If so, read the text and set it, then continue.

Are we reading the singer? If so, read the text and set it, then continue.

Are we reading the thumbnail? If so, read the text and set it, then continue.

etc

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