Android APP開(kāi)發(fā)KML軌跡導(dǎo)出教程示例

更新時(shí)間：2022年12月09日 09:34:38 作者：cxy107750

這篇文章主要為大家介紹了Android APP開(kāi)發(fā)KML軌跡導(dǎo)出教程示例詳解，有需要的朋友可以借鑒參考下，希望能夠有所幫助，祝大家多多進(jìn)步，早日升職加薪

引言

前兩天在知乎上面找海外騎行、跑步軟件Strava的時(shí)候，看到一個(gè)將運(yùn)動(dòng)軌跡從A App 導(dǎo)出，導(dǎo)入到B APP的工具 APP RunGap，恰巧之前給臺(tái)灣、印度那邊的測(cè)試同事處理他們的問(wèn)題時(shí)，寫過(guò)這樣的一個(gè)工具，KML文件導(dǎo)出，然后在Mac下的 Google 地球上看軌跡是否偏差，是否存在坐標(biāo)類型的轉(zhuǎn)化錯(cuò)誤等問(wèn)題，能夠比較快地定位問(wèn)題。

KML文件，讀者有不知道的可以Google一下，它是一種專門存GPS 點(diǎn)數(shù)據(jù)的xml文件格式。

將以下這個(gè)數(shù)據(jù)結(jié)構(gòu) PathRecord類的GPS點(diǎn) List 轉(zhuǎn)換成xml：

圖 1.0 PathRecord

借用PathRecord的時(shí)間戳生成文件，存入SD卡，然后完文件里寫 List 點(diǎn)，文件帶.kml 后綴。

圖1.1 生成KML文件

寫入kml gps點(diǎn)

public static String pullXMLCreate(String outDir, PathRecord pathRecord) {
        final String fileName = createKmlFile(outDir, pathRecord);
        StringWriter xmlWriter = new StringWriter();
        try {
//      // 方式一：使用Android提供的實(shí)用工具類android.util.Xml
//      XmlSerializer xmlSerializer = Xml.newSerializer();
            // 方式二：使用工廠類XmlPullParserFactory的方式
            XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
            XmlSerializer xmlSerializer = factory.newSerializer();
            xmlSerializer.setOutput(xmlWriter);                // 保存創(chuàng)建的xml
            xmlSerializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
            xmlSerializer.startDocument("utf-8", null);
            //給根節(jié)點(diǎn)kml添加屬性
            xmlSerializer.setPrefix("xmlns", "http://www.opengis.net/kml/2.2");
            xmlSerializer.setPrefix("gx", "http://www.google.com/kml/ext/2.2");// <?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
            xmlSerializer.startTag("", "kml");
            xmlSerializer.startTag("", "Document");
            xmlSerializer.startTag("", "Placemark");
            xmlSerializer.startTag("", "Style");
            xmlSerializer.startTag("", "LineStyle");
            xmlSerializer.startTag(null, "color");
            xmlSerializer.text("ff60ff00");//這里的顏色必須小寫
            xmlSerializer.endTag(null, "color");
            xmlSerializer.startTag(null, "width");
            xmlSerializer.text("6");
            xmlSerializer.endTag(null, "width");
            xmlSerializer.endTag("", "LineStyle");
            xmlSerializer.endTag("", "Style");
            List<Gps> points = pathRecord.locationList;
            xmlSerializer.startTag(null, "LineString");
            xmlSerializer.startTag(null, "coordinates");
            xmlSerializer.text(createKMLPointStr(points));
            xmlSerializer.endTag(null, "coordinates");
            xmlSerializer.endTag(null, "LineString");
            xmlSerializer.endTag("", "Placemark");
            xmlSerializer.endTag("", "Document");
            xmlSerializer.endTag("", "kml");
            xmlSerializer.endDocument();
        } catch (XmlPullParserException e) {// XmlPullParserFactory.newInstance
            e.printStackTrace();
        } catch (IllegalArgumentException e) {    // xmlSerializer.setOutput
            e.printStackTrace();
        } catch (IllegalStateException e) {    // xmlSerializer.setOutput
            e.printStackTrace();
        } catch (IOException e) {// xmlSerializer.setOutput
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        String xmlStr = xmlWriter.toString();
        BaseFileUtil.writeStringToFile(fileName, xmlStr);
        return xmlStr;
    }public static String pullXMLCreate(String outDir, PathRecord pathRecord) {
        final String fileName = createKmlFile(outDir, pathRecord);
        StringWriter xmlWriter = new StringWriter();
        try {
//      // 方式一：使用Android提供的實(shí)用工具類android.util.Xml
//      XmlSerializer xmlSerializer = Xml.newSerializer();
            // 方式二：使用工廠類XmlPullParserFactory的方式
            XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
            XmlSerializer xmlSerializer = factory.newSerializer();
            xmlSerializer.setOutput(xmlWriter);                // 保存創(chuàng)建的xml
            xmlSerializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
            xmlSerializer.startDocument("utf-8", null);
            //給根節(jié)點(diǎn)kml添加屬性
            xmlSerializer.setPrefix("xmlns", "http://www.opengis.net/kml/2.2");
            xmlSerializer.setPrefix("gx", "http://www.google.com/kml/ext/2.2");// <?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
            xmlSerializer.startTag("", "kml");
            xmlSerializer.startTag("", "Document");
            xmlSerializer.startTag("", "Placemark");
            xmlSerializer.startTag("", "Style");
            xmlSerializer.startTag("", "LineStyle");
            xmlSerializer.startTag(null, "color");
            xmlSerializer.text("ff60ff00");//這里的顏色必須小寫
            xmlSerializer.endTag(null, "color");
            xmlSerializer.startTag(null, "width");
            xmlSerializer.text("6");
            xmlSerializer.endTag(null, "width");
            xmlSerializer.endTag("", "LineStyle");
            xmlSerializer.endTag("", "Style");
            List<Gps> points = pathRecord.locationList;
            xmlSerializer.startTag(null, "LineString");
            xmlSerializer.startTag(null, "coordinates");
            xmlSerializer.text(createKMLPointStr(points));
            xmlSerializer.endTag(null, "coordinates");
            xmlSerializer.endTag(null, "LineString");
            xmlSerializer.endTag("", "Placemark");
            xmlSerializer.endTag("", "Document");
            xmlSerializer.endTag("", "kml");
            xmlSerializer.endDocument();
        } catch (XmlPullParserException e) {// XmlPullParserFactory.newInstance
            e.printStackTrace();
        } catch (IllegalArgumentException e) {    // xmlSerializer.setOutput
            e.printStackTrace();
        } catch (IllegalStateException e) {    // xmlSerializer.setOutput
            e.printStackTrace();
        } catch (IOException e) {// xmlSerializer.setOutput
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        String xmlStr = xmlWriter.toString();
        BaseFileUtil.writeStringToFile(fileName, xmlStr);
        return xmlStr;
    }

下面是生成的KML文件內(nèi)容，其實(shí)還可以添加更多輔助信息到KML文件的，這里就略去了，直接上軌跡點(diǎn)，超級(jí)簡(jiǎn)單是不是？

奧森10km 軌跡圖

<?xml version='1.0' encoding='utf-8' ?>
<kml xmlns:xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2">
  <Document>
    <Placemark>
      <Style>
        <LineStyle>
          <color>ff60ff00</color>
          <width>6</width>
        </LineStyle>
      </Style>
      <LineString>
        <coordinates>
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      </LineString>
    </Placemark>
  </Document>
</kml>

直接將kml文件拖到Google 地球上，鐺鐺鐺當(dāng)就展現(xiàn)出來(lái)啦。