2

我正在使用谷歌地图 V2 开发一个 android 应用程序,以获取最近的加油站及其状态(如果他们有加油与否),现在我到达以获取我当前的位置并在我的当前位置和给定的经度和纬度之间绘制路线并获得在驾驶模式下到该位置的距离和持续时间。

我的问题是如何到达附近的加油站,有没有办法获得它们并获得它们的经度和纬度,因为我想要执行的是找到距离它最近的加油站并且状态为“里面有气” "然后画出到那个位置的路线。

我要执行的场景是获取所有经度和纬度并将它们存储到具有它们状态的数据库中,当用户去任何位置时,它会获取所有最近的加油站然后去数据库搜索状态然后计算距离然后绘制附近车站的“最短路径”路线,这是执行的合适方式还是我可以用另一种方式做,如果是我该怎么做。

请在下面找到我使用的代码,我也在三星 Galaxy S Duos S7562 上进行测试

地图.java

package com.banzina;

public class Map extends Activity  implements LocationListener{

    GoogleMap map;
    ArrayList<LatLng> markerPoints;
    LatLng myposition;
    LatLng position2;
    float[] results = new float[1];
    TextView tvDistanceDuration;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.show_map);

        tvDistanceDuration = (TextView) findViewById(R.id.tv_dis);

        MapFragment fm=(MapFragment) getFragmentManager().findFragmentById(R.id.map);
        map=fm.getMap();
        map.setMyLocationEnabled(true);
        LocationManager locationManager=(LocationManager) getSystemService(LOCATION_SERVICE);
        Criteria criteria=new Criteria(); // object to retrieve provider
        String provider = locationManager.getBestProvider(criteria, true);
        Location location=locationManager.getLastKnownLocation(provider);
        if(location!=null){
        onLocationChanged(location);

    }
    locationManager.requestLocationUpdates(provider, 20000, 0, this);
        markerPoints = new ArrayList<LatLng>();
        map = fm.getMap();
        map.setMyLocationEnabled(true);
        map.setOnMapClickListener(new OnMapClickListener() {
    @Override
    public void onMapClick(LatLng point){
        if(markerPoints.size()>1)            {
            markerPoints.clear();
            map.clear();
        }
        markerPoints.add(point);
        MarkerOptions options = new MarkerOptions();
        options.position(point);
        if(markerPoints.size()==1)       {              options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));             
        }
        else if(markerPoints.size()==2)            {                options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
        }
        map.addMarker(options);     
        position2 = new LatLng(30.08393, 31.24225);
        if(markerPoints.size() >= 2)
        {
            LatLng origin = markerPoints.get(0);
            LatLng dest = markerPoints.get(1);
              String url = getDirectionsUrl(myposition, position2);
              DownloadTask downloadTask = new DownloadTask();
              downloadTask.execute(url);
              Location.distanceBetween(myposition.latitude, myposition.longitude, position2.latitude, position2.longitude, results);
              map.addMarker(new MarkerOptions().position(position2).title("End"));

        }
    }
        });
    }

    public void distanceTo (Location dest){}
    public static void distanceBetween (double startLatitude, double startLongitude, double endLatitude, double endLongitude, float[] results){

    }

    public void onLocationChanged(Location location) {
                double latitude = location.getLatitude();

        double longitude = location.getLongitude();
        LatLng latLng = new LatLng(latitude, longitude);
        myposition = new LatLng(latitude, longitude);

        map.addMarker(new MarkerOptions().position(myposition).title("Start"));
        map.moveCamera(CameraUpdateFactory.newLatLng(latLng));
        map.animateCamera(CameraUpdateFactory.zoomTo(17));
        TextView t=(TextView) findViewById(R.id.tv_location);
        t.setText("Latitude:" +  latitude  + ", Longitude:"+ longitude );
    }

    private String getDirectionsUrl(LatLng origin,LatLng dest){
        String str_origin = "origin="+origin.latitude+","+origin.longitude;
        String str_dest = "destination="+dest.latitude+","+dest.longitude;
             String sensor = "sensor=false";
        String parameters = str_origin+"&"+str_dest+"&"+sensor;

        // Output format
        String output = "json";

        // Building the url to the web service
        String url = "https://maps.googleapis.com/maps/api/directions/"+output+"?"+parameters;

        return url;
    }

    /** A method to download json data from url */
    private String downloadUrl(String strUrl) throws IOException{
        String data = "";
        InputStream iStream = null;
        HttpURLConnection urlConnection = null;
        try{
            URL url = new URL(strUrl);

            // Creating an http connection to communicate with url
            urlConnection = (HttpURLConnection) url.openConnection();

            // Connecting to url
            urlConnection.connect();

            // Reading data from url
            iStream = urlConnection.getInputStream();

            BufferedReader br = new BufferedReader(new InputStreamReader(iStream));

            StringBuffer sb  = new StringBuffer();

            String line = "";
            while( ( line = br.readLine())  != null){
                sb.append(line);
            }

            data = sb.toString();

            br.close();

        }catch(Exception e){
            Log.d("Exception while downloading url", e.toString());
        }finally{
            iStream.close();
            urlConnection.disconnect();
        }
        return data;
    }

    // Fetches data from url passed
    private class DownloadTask extends AsyncTask<String, Void, String>{

        // Downloading data in non-ui thread
        @Override
        protected String doInBackground(String... url) {

            // For storing data from web service
            String data = "";

            try{
                // Fetching the data from web service
                data = downloadUrl(url[0]);
            }catch(Exception e){
                Log.d("Background Task",e.toString());
            }
            return data;
        }

        // Executes in UI thread, after the execution of
        // doInBackground()
        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);

            ParserTask parserTask = new ParserTask();

            // Invokes the thread for parsing the JSON data
            parserTask.execute(result);
        }
    }

    /** A class to parse the Google Places in JSON format */
    private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap<String,String>>> >{

        // Parsing the data in non-ui thread
        @Override
        protected List<List<HashMap<String, String>>> doInBackground(String... jsonData) {

            JSONObject jObject;
            List<List<HashMap<String, String>>> routes = null;

            try{
                jObject = new JSONObject(jsonData[0]);
                DirectionsJSONParser parser = new DirectionsJSONParser();

                // Starts parsing data
                routes = parser.parse(jObject);
            }catch(Exception e){
                e.printStackTrace();
            }
            return routes;
        }

        // Executes in UI thread, after the parsing process
        @Override
        protected void onPostExecute(List<List<HashMap<String, String>>> result) {
            ArrayList<LatLng> points = null;
            PolylineOptions lineOptions = null;
            MarkerOptions markerOptions = new MarkerOptions();
            String distance = "";
            String duration = "";

            // Traversing through all the routes
            for(int i=0;i<result.size();i++){
                points = new ArrayList<LatLng>();
                lineOptions = new PolylineOptions();

                // Fetching i-th route
                List<HashMap<String, String>> path = result.get(i);

                // Fetching all the points in i-th route
                for(int j=0;j<path.size();j++){
                    HashMap<String,String> point = path.get(j);
                    if(j==0){    // Get distance from the list
                        distance = (String)point.get("distance");
                        continue;
                    }else if(j==1){ // Get duration from the list
                        duration = (String)point.get("duration");
                        continue;
                    }

                    double lat = Double.parseDouble(point.get("lat"));
                    double lng = Double.parseDouble(point.get("lng"));
                    LatLng position = new LatLng(lat, lng);

                    points.add(position);
                }

                // Adding all the points in the route to LineOptions
                lineOptions.addAll(points);
                lineOptions.width(2);
                lineOptions.color(Color.RED);
            }
            tvDistanceDuration.setText("Distance:"+distance + ", Duration:"+duration);

            // Drawing polyline in the Google Map for the i-th route
            map.addPolyline(lineOptions);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.map, menu);
        return true;
    }}

布局 sho_map.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ShowMap" >
<fragment
        android:id="@+id/map"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        class="com.google.android.gms.maps.MapFragment" />
     <TextView
        android:id="@+id/tv_location"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/map"
        android:layout_alignTop="@+id/map"
        android:layout_marginLeft="83dp"
        android:text="TextView" />

     <TextView
         android:id="@+id/tv_dis"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignParentBottom="true"
         android:layout_alignParentLeft="true"
         android:layout_marginBottom="15dp"
         android:layout_marginLeft="14dp"
         android:text="TextView" />

</RelativeLayout>

清单.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.banzina"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="15"
        android:targetSdkVersion="15" />

    <permission
        android:name="com.banzina.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />
    <uses-permission android:name="com.banzina.permission.MAPS_RECEIVE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="android.permission.com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <uses-feature
        android:name="android.hardware.location"
        android:required="false" />
    <uses-feature
        android:name="android.hardware.location.network"
        android:required="false" />
    <uses-feature android:name="android.hardware.location.gps" />
    <uses-feature
        android:name="android.hardware.wifi"
        android:required="false" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.banzina.Map"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="*********My Key********" />


    </application>
</manifest>  

方向JSONParser.java

package com.banzina;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.google.android.gms.maps.model.LatLng;

public class DirectionsJSONParser {
     /** Receives a JSONObject and returns a list of lists containing latitude and longitude */
    public List<List<HashMap<String,String>>> parse(JSONObject jObject){

        List<List<HashMap<String, String>>> routes = new ArrayList<List<HashMap<String,String>>>() ;
        JSONArray jRoutes = null;
        JSONArray jLegs = null;
        JSONArray jSteps = null;
        JSONObject jDistance = null;
        JSONObject jDuration = null;


        try {

            jRoutes = jObject.getJSONArray("routes");

            /** Traversing all routes */
            for(int i=0;i<jRoutes.length();i++){
                jLegs = ( (JSONObject)jRoutes.get(i)).getJSONArray("legs");
                List path = new ArrayList<HashMap<String, String>>();

                /** Traversing all legs */
                for(int j=0;j<jLegs.length();j++){
                  //  jSteps = ( (JSONObject)jLegs.get(j)).getJSONArray("steps");
                    /** Getting distance from the json data */
                    jDistance = ((JSONObject) jLegs.get(j)).getJSONObject("distance");
                    HashMap<String, String> hmDistance = new HashMap<String, String>();
                    hmDistance.put("distance", jDistance.getString("text"));

                    /** Getting duration from the json data */
                    jDuration = ((JSONObject) jLegs.get(j)).getJSONObject("duration");
                    HashMap<String, String> hmDuration = new HashMap<String, String>();
                    hmDuration.put("duration", jDuration.getString("text"));

                    /** Adding distance object to the path */
                    path.add(hmDistance);

                    /** Adding duration object to the path */
                    path.add(hmDuration);

                    jSteps = ( (JSONObject)jLegs.get(j)).getJSONArray("steps");


                    /** Traversing all steps */
                    for(int k=0;k<jSteps.length();k++){
                        String polyline = "";
                        polyline = (String)((JSONObject)((JSONObject)jSteps.get(k)).get("polyline")).get("points");
                        List<LatLng> list = decodePoly(polyline);

                        /** Traversing all points */
                        for(int l=0;l<list.size();l++){
                            HashMap<String, String> hm = new HashMap<String, String>();
                            hm.put("lat", Double.toString(((LatLng)list.get(l)).latitude) );
                            hm.put("lng", Double.toString(((LatLng)list.get(l)).longitude) );
                            path.add(hm);
                        }
                    }
                    routes.add(path);
                }
            }

        } catch (JSONException e) {
            e.printStackTrace();
        }catch (Exception e){
        }
        return routes;
    }

    /**
    * Method to decode polyline points
    * Courtesy : jeffreysambells.com/2010/05/27/decoding-polylines-from-google-maps-direction-api-with-java
    * */
    private List<LatLng> decodePoly(String encoded) {

        List<LatLng> poly = new ArrayList<LatLng>();
        int index = 0, len = encoded.length();
        int lat = 0, lng = 0;

        while (index < len) {
            int b, shift = 0, result = 0;
            do {
                b = encoded.charAt(index++) - 63;
                result |= (b & 0x1f) << shift;
                shift += 5;
            } while (b >= 0x20);
            int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
            lat += dlat;

            shift = 0;
            result = 0;
            do {
                b = encoded.charAt(index++) - 63;
                result |= (b & 0x1f) << shift;
                shift += 5;
            } while (b >= 0x20);
            int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
            lng += dlng;

            LatLng p = new LatLng((((double) lat / 1E5)),
                                 (((double) lng / 1E5)));
            poly.add(p);
        }
        return poly;
    }

}
4

1 回答 1

4

对于您的应用程序,您需要访问包含 Places 的数据库,例如 Google Places 或 Yelp。

该过程与您为解析方向所做的相同。通过向正确格式的 URL 发送 HTTP GET 请求来查询 API,下载返回的数据(很可能是 JSON 格式),解析它,然后添加你的Markers.

我提到的 API 文档的链接

https://developers.google.com/places/documentation/ http://www.yelp.com/developers/documentation/v2/overview

于 2013-05-14T01:29:38.053 回答