Android高德地图开发--读取解析KML文件并显示在地图上

先来看效果图

1 本文实现的功能如下：
1.1 浏览本地文件，找到KML文件；
1.2 读取解析KML文件；
1.3 将KML文件中的位置信息显示在高德地图上；
总体框架和思路：打开文件对话框浏览*.kml文件，点击kml文件之后，返回此文件的路径，在AddSample.java类中获取到我们选择的kml文件的路径，然后调用ReadKml.java类中的parseKml方法，将KML文件路径传给parseKml以便解析。在解析KML时要先将KML文件解压缩（也可以不用解压缩），目的是解析KML压缩文件内的doc.kml。我们解析到KML文件中我们需要的属性值，x,y,name之后，要建立一个Coordinate类，用来存放上述的三个属性，每个Coordinate实例化对象才是我们所需要的。此处可以设置一个list，用来存放每个实例化对象。接下来便是参考高德地图的官方demo设置一下每个point的marker属性了。循环将其添加到地图上即可。
2 具体实现
2.1 打开文件对话框，浏览本地文件（此处完全用的是另外一大神博客中的代码，地址实在是找不到了，在此感谢）
2.1.1 先添加一个按钮的布局文件addsample.xml，点击此按钮后能够弹出打开文件的对话框

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Button        android:id="@+id/addsample_button"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/add_sample" /></LinearLayout>

再添加一个浏览本地文件界面的布局文件filedialogitem.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/file_dialog"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:background="#FFFFFF"    android:padding="4dp"    android:orientation="horizontal" >    <ImageView         android:id="@+id/filedialogitem_img"        android:layout_width="32dp"        android:layout_height="32dp"        android:layout_margin="4dp"/>    <LinearLayout         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:orientation="vertical">        <TextView             android:id="@+id/filedialogitem_name"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:textSize="16sp"            android:textColor="#000000"            android:textStyle="bold"/>        <TextView             android:id="@+id/filedialogitem_path"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:textSize="16sp"            android:textColor="#000000"/>    </LinearLayout></LinearLayout>

2.1.2 添加回调函数CallBackBundle.java

import android.os.Bundle;public interface CallBackBundle {    void callBack(Bundle bundle);}

2.1.3 添加OpenFileDialog.java，是实现浏览文件功能的主要代码

import java.io.File;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import com.soil.soilsampling.R;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.Context;import android.os.Bundle;import android.util.AttributeSet;import android.view.View;import android.widget.AdapterView;import android.widget.ListView;import android.widget.SimpleAdapter;import android.widget.Toast;import android.widget.AdapterView.OnItemClickListener;public class OpenFileDialog {    public static String tag = "OpenFileDialog";    public static final String sRoot = "/"; //根目录    public static final String sParent = ".."; //父目录    public static final String sFolder = "."; //当前文件夹    public static final String sEmpty = "";    private static final String sErrorMsg = "访问出错！";    public static Dialog createDialog(int id, Context context, String title, CallBackBundle callBack, String suffix, Map<String, Integer> images)    {        AlertDialog.Builder builder = new AlertDialog.Builder(context);        builder.setView(new FileSelectView(context, id, callBack, suffix, images));        Dialog dialog = builder.create();        dialog.setTitle(title);        return dialog;    }    // 点击打开浏览文件按钮后（或者加载样点按钮）出现的浏览磁盘文件的view    static class FileSelectView extends ListView implements OnItemClickListener    {         // 此view就是一个listview，每一行就是一个文件夹路径，每一行我们设置包括：文件夹图标，文件夹名称，路径        private CallBackBundle callBack = null;        private String path = sRoot;        private List<Map<String, Object>> list = null; //浏览文件窗口实际上是一个listview，那么这个list就是listview的每一行                                        // 一个list包含：当前文件夹的路径，名字和图标        private int dialogId = 0;//对话框ID        private String suffix = null;//我们要选取的文件类型后缀，如kml文件        private Map<String, Integer> imageMap = null;        public FileSelectView(Context context,int dialogId, CallBackBundle callBack, String suffix, Map<String, Integer> images) {            super(context);            this.imageMap = images;            this.suffix = suffix==null?"":suffix.toLowerCase();            this.callBack = callBack;            this.dialogId = dialogId;            this.setOnItemClickListener(this);            refreshFileList();        }        private String getSuffix(String fileName)        {            int dix = fileName.lastIndexOf('.');            if (dix < 0) {                return "";            }            else {                return fileName.substring(dix+1);            }        }        // 获取某个文件目录（如根目录，父目录等目录）的图标        private int getImageId(String s)        {            if (imageMap == null) {                return 0;            }            else if (imageMap.containsKey(s)) {                return imageMap.get(s);            }            else if (imageMap.containsKey(sEmpty)) {                return imageMap.get(sEmpty);            }            else {                return 0;            }        }        // 刷新文件列表        private int refreshFileList()        {            File[] files = null;            try {                files = new File(path).listFiles();            } catch (Exception e) {                files = null;            }            if (files == null) {                //如果访问出错                Toast.makeText(getContext(), sErrorMsg, Toast.LENGTH_SHORT).show();                return -1;            }            if (list != null) {                list.clear();            }            else {                list = new ArrayList<Map<String, Object>>(files.length);            }            //用来保存文件夹和文件的两个列表            ArrayList<Map<String, Object>> lfolders = new ArrayList<Map<String,Object>>();            ArrayList<Map<String, Object>> lfiles = new ArrayList<Map<String,Object>>();            if (! this.path.equals(sRoot)) {                //如果当前目录不是根目录，就添加根目录和上一层目录                Map<String, Object> map = new HashMap<String, Object>();                map.put("name", sRoot);                map.put("path", sRoot);                map.put("img", getImageId(sRoot));                list.add(map);                map = new HashMap<String, Object>();                map.put("name", sParent);                map.put("path", path);                map.put("img", getImageId(sParent));                list.add(map);            }            for (File file:files) {                if (file.isDirectory() && file.listFiles()!=null) {                    //添加文件夹                    Map<String, Object> map = new HashMap<String, Object>();                    map.put("name", file.getName());                    map.put("path", file.getPath());                    map.put("img", getImageId(sFolder));                    lfolders.add(map);                }                else if (file.isFile()) {                    // 添加文件                    String fileSuffix = getSuffix(file.getName()).toLowerCase();                    if(suffix == null || suffix.length()==0 || (fileSuffix.length()>0 && suffix.indexOf("."+fileSuffix+";")>=0))                    {                        Map<String, Object> map = new HashMap<String, Object>();                        map.put("name", file.getName());                        map.put("path", file.getPath());                        map.put("img", getImageId(fileSuffix));                        lfiles.add(map);                    }                }            }            list.addAll(lfolders);//先添加文件夹，确保文件夹显示在list的上面            list.addAll(lfiles);//再添加文件            SimpleAdapter adapter = new SimpleAdapter(getContext(), list, R.layout.filedialogitem, new String[]{"img","name","path"},                     new int[]{R.id.filedialogitem_img, R.id.filedialogitem_name, R.id.filedialogitem_path});            this.setAdapter(adapter);            return files.length;        }        @Override        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {            // TODO Auto-generated method stub            //条目选择            String filePath = (String)list.get(position).get("path");            String fileName = (String)list.get(position).get("name");            if (fileName.equals(sRoot) || fileName.equals(sParent)) {                //如果选择的是根目录或者父目录                File file = new File(filePath);                String pathParent = file.getParent();                if (pathParent != null) {                    path = pathParent;                }                else {                    path = sRoot;                }            }            else {                File file = new File(filePath);                //如果选择的是文件                if (file.isFile()) {                    ((Activity)getContext()).dismissDialog(this.dialogId);//让文件对话框消失                    //设置回调的返回值                    Bundle bundle = new Bundle();                    bundle.putString("path", filePath);                    bundle.putString("name", fileName);                    // 调用事先设置的回调函数                    this.callBack.callBack(bundle);                    return;                }                else if (file.isDirectory()) {                    //如果选择的是文件夹，则进入文件夹                    path = filePath;                }            }            this.refreshFileList();        }    }}

2.1.4 添加AddSample.java，是addsample.xml布局文件的实现

import java.util.HashMap;import java.util.Map;import com.soil.parsexml.ReadKml;import com.soil.soilsampling.R;import android.app.Activity;import android.app.Dialog;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;public class AddSample extends Activity{        static private int openFileDialogId = 0;        ReadKml readKml = new ReadKml();    @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        setContentView(R.layout.addsample);             findViewById(R.id.addsample_button).setOnClickListener(new OnClickListener() {              @Override            public void onClick(View v) {                // TODO Auto-generated method stub                showDialog(openFileDialogId);            }        });    }    @Override    protected Dialog onCreateDialog(int id) {        if (id == openFileDialogId) {            // 设置各种文件类型的图标            Map<String, Integer> images = new HashMap<String, Integer>();            images.put(OpenFileDialog.sRoot, R.drawable.filedialog_root);//根目录图标            images.put(OpenFileDialog.sParent, R.drawable.up32);//返回上一层，父目录图标            images.put(OpenFileDialog.sFolder, R.drawable.folder34);//文件夹图标            images.put("kml", R.drawable.kml32);            //images.put("kmz", R.drawable.kml32);            images.put(OpenFileDialog.sEmpty, R.drawable.filedialog_root);            Dialog dialog = OpenFileDialog.createDialog(id,this , "打开文件", new CallBackBundle() {                @Override                public void callBack(Bundle bundle) {                    // TODO Auto-generated method stub                    String filePath = bundle.getString("path");                    //String fileName = bundle.getString("name");                    setTitle(filePath);                    try {                        readKml.parseKml(filePath);//调用ReadKML类中的解析方法                    } catch (Exception e) {                        // TODO Auto-generated catch block                        e.printStackTrace();                    }                }            }, ".kml;", images);            return dialog;        }        return null;    }}

至此，我们已经实现了打开文件对话框，浏览KML文件的功能，效果图如下：




2.2 读取并解析KML文件
我们要实现的就是，找到sdcard中的KML文件之后，点击，程序便开始解析KML文件。我们要在地图上显示出KML中的点，必须将KML文件中Placemark节点下面的coordinates节点中的x,y坐标解析出来。又每个x,y坐标必须是一对，因此我们建立一个Coordinate类专门用来存放x,y坐标。在解析KML时主要使用了dom4j包。在这里可以参考我的另外一篇博客：http://blog.csdn.net/hnyzwtf/article/details/50202405
2.2.1 新建ReadKml.java实现解析KML的核心功能

import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import java.util.zip.ZipEntry;import java.util.zip.ZipException;import java.util.zip.ZipFile;import java.util.zip.ZipInputStream;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader;import org.jsoup.Jsoup;import org.jsoup.select.Elements;import com.soil.model.Coordinate;import com.soil.soilsampling.MainActivity;import android.util.Log;public class ReadKml {    public static boolean addSampleSuccess = false; //判断读取KML是否成功    private Coordinate coordinate = null; //存储从KML文件中读取出来的坐标值和name    private static List<Coordinate> coordinateList = new ArrayList();//存储每次实例化的Coordinate对象，每个Coordinate都保存着不同的x,y,name    public void parseKml(String pathName) throws Exception    {               File file = new File(pathName);//pathName为KML文件的路径        try {            ZipFile zipFile = new ZipFile(file);            ZipInputStream zipInputStream = null;            InputStream inputStream = null;            ZipEntry entry = null;            zipInputStream = new ZipInputStream(new FileInputStream(file));            while ((entry = zipInputStream.getNextEntry()) != null) {                String zipEntryName = entry.getName();                if (zipEntryName.endsWith("kml") || zipEntryName.endsWith("kmz")) {                                     inputStream = zipFile.getInputStream(entry);                    parseXmlWithDom4j(inputStream);                }else if (zipEntryName.endsWith("png")) {                }            }                       zipInputStream.close();            inputStream.close();        } catch (ZipException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    public Boolean parseXmlWithDom4j(InputStream input) throws Exception    {        SAXReader reader = new SAXReader();        Document document = null;        try {            document = reader.read(input);            Element root = document.getRootElement();//获取doc.kml文件的根结点            listNodes(root);                        addSampleSuccess = true;            //选择sd卡中的kml文件，解析成功后即调用MainActivity中的添加marker的方法向地图上添加样点marker            MainActivity mainActivity = new MainActivity();            mainActivity.addSampleMarker();//调用MainActivity中的方法        } catch (DocumentException e) {            // TODO: handle exception            e.printStackTrace();        }           return addSampleSuccess;    }    //遍历当前节点下的所有节点      public void listNodes(Element node){          String name = "";//Placemark节点中的name属性        String x = "";//坐标x        String y = "";//坐标y        double d_x = 0.0;//对x作string to double        double d_y = 0.0;        try {            if ("Placemark".equals(node.getName())) {//如果当前节点是Placemark就解析其子节点                List<Element> placemarkSons = node.elements();//得到Placemark节点所有的子节点                for (Element element : placemarkSons) { //遍历所有的子节点                              if ("name".equals(element.getName())) {                        name = element.getText();                                       }                                                           }                Element pointSon;//Point节点的子节点                Iterator i = node.elementIterator("Point");//遍历Point节点的所有子节点                while (i.hasNext()) {                    pointSon = (Element)i.next();                    String nodeContent = "";                    nodeContent = pointSon.elementText("coordinates");//得到coordinates节点的节点内容                    String nodeContentSplit[] = null;                    nodeContentSplit = nodeContent.split(",");                    x = nodeContentSplit[1];                    y = nodeContentSplit[0];                    d_x = Double.valueOf(x.trim());                    d_y = Double.valueOf(y.trim());                }                               coordinate = new Coordinate(d_x, d_y , name);                coordinateList.add(coordinate);//将每一个实例化的对象存储在list中            }        } catch (Exception e) {            e.printStackTrace();        }        //同时迭代当前节点下面的所有子节点          //使用递归          Iterator<Element> iterator = node.elementIterator();          while(iterator.hasNext()){              Element e = iterator.next();              listNodes(e);          }         }       public List<Coordinate> getCoordinateList()    {                   return this.coordinateList;    }}

2.2.2 Coordinate类

package com.soil.model;public class Coordinate {    private double x;    private double y;    private String name;    public Coordinate(double x, double y, String name)    {        this.x = x;        this.y = y;        this.name = name;    }    public double getX() {        return x;    }    public void setX(double x) {        this.x = x;    }    public double getY() {        return y;    }    public void setY(double y) {        this.y = y;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }}

2.3 设置要添加到地图上的point的一些属性
2.3.1 新建SoilSampleUtil.java

package com.soil.utils;import java.util.ArrayList;import java.util.List;import android.util.Log;import com.amap.api.maps.AMap;import com.amap.api.maps.model.BitmapDescriptor;import com.amap.api.maps.model.BitmapDescriptorFactory;import com.amap.api.maps.model.LatLng;import com.amap.api.maps.model.Marker;import com.amap.api.maps.model.MarkerOptions;import com.soil.model.Coordinate;import com.soil.parsexml.ReadKml;import com.soil.soilsampling.R;/* * 设置要添加到地图上的样点Marker的一些属性 * */public class SoilSampleUtil {    public static AMap aMapUtil;//添加marker到地图上需要使用AMap类的实例化对象    static ReadKml readKml = new ReadKml();    private static MarkerOptions markerOption;    private static ArrayList<Marker> markers = new ArrayList<Marker>();     private static List<Coordinate> sampleList = readKml.getCoordinateList();    static double x = 0.0;    static double y = 0.0;      public static void addSampleMarkersData()    {               if (markers.size() == 0) {              //设置marker的图标为默认的天蓝色气泡            BitmapDescriptor bitmapDescriptor = BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE);            for (int i = 0; i < sampleList.size(); i++) {                x = sampleList.get(i).getX();//获取marker的坐标值                y = sampleList.get(i).getY();                                           markerOption = new MarkerOptions();                             markerOption.setFlat(true);                markerOption.anchor(0.5f, 0.5f);                markerOption.icon(bitmapDescriptor);                                markerOption.position(new LatLng(x, y));                                                    //Log.d("SoilSampleUtil", String.valueOf(i)+"-->"+String.valueOf(x)+","+String.valueOf(y));                             try {                                       if (aMapUtil != null) {                        Marker marker = aMapUtil.addMarker(markerOption);                                       markers.add(marker);                    }                    else {                        Log.d("SoilSampleUtil", "aMap is null !!!");                    }                               } catch (Exception e) {                    e.printStackTrace();                }            }        }    }}

2.3.2 我们在MainActivity中添加一个方法，调用2.3.1中的addSampleMarkersData方法即可。

 public void addSampleMarker()    {        if (ReadKml.addSampleSuccess) {            SoilSampleUtil.addSampleMarkersData();                  }          else {            Log.d("MainActivity", "addSampleSuccess is false or aMap is null");        }    }

另外，我们必须在onPause方法中添加以下代码

 @Override    protected void onPause() {          //当点击添加样点数据按钮时，MainActivity就会隐藏不可见，因此，在其声明周期“暂停”之前，必须将AMap的实例化对象传给SoilSampleUtil中的aMapUtil        //以避免AMap实例化对象为空        SoilSampleUtil.aMapUtil = aMap;        super.onPause();        mapView.onPause();    }

3 至此，我们已经实现了解析KML文件并在高德地图加载marker的功能
效果图如下：

源码在这里：http://download.csdn.net/detail/hnyzwtf/9385155