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Android APP开发KML轨迹导出教程示例

cxy107750 人气:0

引言

前两天在知乎上面找海外骑行、跑步软件Strava的时候,看到一个将运动轨迹从A App 导出,导入到B APP的工具 APP RunGap,恰巧之前给台湾、印度那边的测试同事处理他们的问题时,写过这样的一个工具,KML文件导出,然后在Mac下的 Google 地球上看轨迹是否偏差,是否存在坐标类型的转化错误等问题,能够比较快地定位问题。

KML文件,读者有不知道的可以Google一下,它是一种专门存GPS 点数据的xml文件格式。

将以下这个数据结构 PathRecord类的GPS点 List 转换成xml:

图 1.0 PathRecord

借用PathRecord的时间戳生成文件,存入SD卡,然后完文件里写 List 点, 文件带.kml 后缀。

图1.1 生成KML文件

写入kml gps点

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提供的实用工具类android.util.Xml
//      XmlSerializer xmlSerializer = Xml.newSerializer();
            // 方式二:使用工厂类XmlPullParserFactory的方式
            XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
            XmlSerializer xmlSerializer = factory.newSerializer();
            xmlSerializer.setOutput(xmlWriter);                // 保存创建的xml
            xmlSerializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
            xmlSerializer.startDocument("utf-8", null);
            //给根节点kml添加属性
            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");//这里的颜色必须小写
            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提供的实用工具类android.util.Xml
//      XmlSerializer xmlSerializer = Xml.newSerializer();
            // 方式二:使用工厂类XmlPullParserFactory的方式
            XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
            XmlSerializer xmlSerializer = factory.newSerializer();
            xmlSerializer.setOutput(xmlWriter);                // 保存创建的xml
            xmlSerializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
            xmlSerializer.startDocument("utf-8", null);
            //给根节点kml添加属性
            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");//这里的颜色必须小写
            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文件内容,其实还可以添加更多辅助信息到KML文件的,这里就略去了,直接上轨迹点,超级简单是不是?

奥森10km 轨迹图

<?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>
116.39348170420259,40.01190507680628 
116.39450478868154,40.012104086029254 
116.39481726475313,40.01208005324708 
116.39511694229225,40.012009991578616 
116.39580711364755,40.012061307700286 
116.39665653452886,40.01188178384924 
116.39678459102021,40.01180961243906 
116.39697500459975,40.011471523134674 
116.39698255521978,40.01139207409671 
116.39687616848552,40.01126881996522 
116.39665872919042,40.01115435968396 
116.39654356043086,40.010968925696965 
116.39653036511537,40.01087789762913 
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116.39679748281328,40.010473202401144 
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116.39536108668436,40.02172348883348 
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116.39376968562837,40.02165166688106 
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116.39193652967609,40.02286602701059 
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116.40086147101938,40.0279336357706 
116.40051182038502,40.028538691496564 
116.39987329113715,40.029088053832275 
116.39962006427466,40.02915865707772 
116.39936196461215,40.029161070837674 
116.39808724055626,40.02897535982718 
116.3973751891038,40.028671500090525 
116.39720199786572,40.028660897288304 
116.39592890605488,40.028925593909754 
116.3949549714303,40.02934906630121 
116.39426274832482,40.029812589403946 
116.39359856312939,40.030140254691155 
116.39311998007548,40.03048394400153 
116.39231593389374,40.030749786322964 
116.39135698306774,40.03097689480288 
116.39115736525918,40.030977533521146 
116.3899641069909,40.030828225135366 
116.38724540646109,40.03071910713684 
116.38690936921729,40.03074932895987 
116.38399932313702,40.03057491549396 
116.382732199911,40.03028076317685 
116.38232732000661,40.030273442065464 
116.38178406586397,40.030347550190456 
116.38004988336155,40.03029280366401 
116.37868235429923,40.02999310215089 
116.37781129913705,40.02941602190564 
116.37740685573442,40.02900829910359 
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116.3778745522578,40.02661433982844 
116.37792292072456,40.02635183106591 
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116.38886896687934,40.02200998202478 
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116.38836363506562,40.011955982458204 
116.38994930228544,40.012122471921515 
116.39204826869613,40.01169536122755 
116.3926362705122,40.011811400930924 
116.39317629112587,40.011809775046174 
116.39336336314635,40.0119145377369 
116.39341299039299,40.01191266234115 
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116.39247366922483,40.01038227793181 </coordinates>
      </LineString>
    </Placemark>
  </Document>
</kml>

直接将kml文件拖到Google 地球上,铛铛铛当就展现出来啦。

图1.2 Google地球展示kml文件

生成的kml标准文件,理论上可以导入到其它支持Share的APP,就可以进行数据迁移了。

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