【Android开发】XML文件解析

最近在做一个项目，涉及到XML文件的解析，废话不多说，如下：

---

---

读取

private ArrayList<Data> readXMLLocked() {
        File file = new File(mDirPath, mFileName);
        if (!file.exists()) {
            return null;
        }
        ArrayList list = new ArrayList<Data>();
        InputStream in = null;
        try {
            in = new FileInputStream(file);
            XmlPullParser pullParser = Xml.newPullParser();
            pullParser.setInput(in, "UTF-8");
            int event = pullParser.getEventType();
            while (event != XmlPullParser.END_DOCUMENT) {
                switch (event) {
                    case XmlPullParser.START_DOCUMENT:
                        break;
                    case XmlPullParser.START_TAG:
                        String name = pullParser.getName();
                        ILog.d(TAG, "xmlname:" + name);
                        if (TAG_ITEM.equals(name)) {
                            int count = pullParser.getAttributeCount();
                            Data data = new Data();
                            for (int i = 0; i < count; i++) {
                                String attName = pullParser.getAttributeName(i);
                                if (ATT_DATA.equals(attName)) {
                                    data.setmWeight(Float.valueOf(pullParser.getAttributeValue(i)));
                                } else if (ATT_TIME.equals(attName)) {
                                    data.setTime(Long.valueOf(pullParser.getAttributeValue(i)));
                                }
                            }
                            list.add(data);
                        } else if (TAG_VERSION.equals(name)) {

                        }
                        break;
                    case XmlPullParser.END_TAG:
                        break;
                }
                event = pullParser.next();
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        } finally {
            try {
                in.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return list;
    }

保存：

private synchronized boolean saveXMLLocked(ArrayList<Data> list, OutputStream outStream) {
        try {
            XmlSerializer serializer = Xml.newSerializer();
            serializer.setOutput(outStream, "UTF-8");
            serializer.startDocument("UTF-8", true);
            serializer.startTag(null, TAG_IWEIHT);
            serializer.startTag(null, TAG_VERSION);
            serializer.text(String.valueOf(DBHelper.VERSION));
            serializer.endTag(null, TAG_VERSION);
            for (Data data : list) {
                serializer.startTag(null, TAG_ITEM);
                serializer.attribute(null, ATT_DATA, String.valueOf(data.getWeight()));
                serializer.attribute(null, ATT_TIME, String.valueOf(data.getTime()));
                serializer.endTag(null, TAG_ITEM);
            }
            serializer.endTag(null, TAG_IWEIHT);
            serializer.endDocument();
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        } finally {
            try {
                outStream.flush();
                outStream.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return true;
    }

对应的XML文件的格式如下：

<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
<iweight>
    <version>1</version>
        <item data="25.0" time="1482927231388" />
        <item data="75.0" time="1482927234989" />
        <item data="48.0" time="1482927238008" />
</iweight>