在谷歌地图制作公共交通路线

Question

我想在我的城市做一个关于公共交通导航的应用程序，但我不知道我应该用什么来绘制谷歌地图中的路线，任何人都可以提供解决方案？

是A到B和B到A只是使用一条路线还是两个？以及如何将其导入Google地图？我也使用android studio。

Answer 1

你就这样。 这是第一个静态类没有什么改变这个类相同的复制&粘贴。

package com.ibl.googlemap; 

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; 

    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"); 

       /** 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 : 
* http://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; 
} 
} 

听到这个类阅读正确的一些评论。

package com.ibl.googlemap; 

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import java.text.DecimalFormat; 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 

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

import android.app.ProgressDialog; 
import android.content.Intent; 
import android.graphics.Color; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.support.v4.app.FragmentActivity; 
import android.util.Log; 
import android.view.KeyEvent; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.RelativeLayout; 
import android.widget.Toast; 

import com.google.android.gms.maps.CameraUpdateFactory; 
import com.google.android.gms.maps.GoogleMap; 
import com.google.android.gms.maps.GoogleMap.OnMapClickListener; 
import com.google.android.gms.maps.SupportMapFragment; 
import com.google.android.gms.maps.model.BitmapDescriptorFactory; 
import com.google.android.gms.maps.model.LatLng; 
import com.google.android.gms.maps.model.Marker; 
import com.google.android.gms.maps.model.MarkerOptions; 
import com.google.android.gms.maps.model.PolylineOptions; 
import com.ibl.comman.GPSTracker; 
import com.ibl.foodpulse.CreateShareDeal; 
import com.ibl.foodpulse.R; 

public class ViewMapDirection extends FragmentActivity implements  OnClickListener { 

private GoogleMap map; 
private ArrayList<LatLng> markerPoints; 
private Button btnShow; 
private double ans; 

private GPSTracker gps; // this is current location 
private double latitude, longitude; 
// this is user current location lat lng 
private double longitude2, latitude2; 
private int bcid; 
private int vuid; 
String res = ""; 
String url2; 

Boolean checknet = true; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.googlemap_only_activity); 
    gps = new GPSTracker(ViewMapDirection.this); 

    Bundle b = getIntent().getExtras(); 
    latitude = b.getFloat("lat"); // hear i got lat lng from last activity. 
    longitude = b.getFloat("longy"); 
    Log.e("View Map Direction", "get the Lat and Lng :" + latitude + " :: " + longitude); 

    if (gps.canGetLocation()) { 
     // please set here your current location and hide this method 
     latitude2 = gps.getLatitude(); 
     longitude2 = gps.getLongitude(); 
     // hear i will got current location from GPS Tracker 
     Log.e("View Map Direction ", " get Current Lat lng " + latitude2 + " lng " + longitude2); 
    } else { 
     gps.showSettingsAlert(ViewMapDirection.this, ViewMapDirection.this); 
    } 

    Intent j = getIntent(); 
    bcid = j.getIntExtra("BCARD_ID", 0); 
    vuid = j.getIntExtra("VUID1", 0); 
    btnShow = (Button) findViewById(R.id.btn_onlywebview_close); 
    SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager() 
      .findFragmentById(R.id.map_googlemapAct); 

    // Getting Map for the SupportMapFragment 
    map = fm.getMap(); 
    /* 
    * db=new MyDBHandler(this); gp=db.getGPSdata(bcid); 
    */ 
    btnShow.setOnClickListener(this); 

} 

// Initializing 
private String getDirectionsUrl(LatLng origin, LatLng dest) { 

    // Origin of route 
    String str_origin = "origin=" + origin.latitude + "," + origin.longitude; 

    // Destination of route 
    String str_dest = "destination=" + dest.latitude + "," + dest.longitude; 

    // Sensor enabled 
    String sensor = "sensor=false"; 

    // Building the parameters to the web service 
    String parameters = str_origin + "&" + str_dest + "&" + sensor; 

    // Output format 
    String output = "json"; 

    // Start 

    int Radius = 6371;// radius of earth in Km 
    double lat1 = origin.latitude; 
    double lat2 = dest.latitude; 
    double lon1 = origin.longitude; 
    double lon2 = dest.longitude; 
    double dLat = Math.toRadians(lat2 - lat1); 
    double dLon = Math.toRadians(lon2 - lon1); 
    double a = Math.sin(dLat/2) * Math.sin(dLat/2) + Math.cos(Math.toRadians(lat1)) 
      * Math.cos(Math.toRadians(lat2)) * Math.sin(dLon/2) * Math.sin(dLon/2); 
    double c = 2 * Math.asin(Math.sqrt(a)); 
    double valueResult = Radius * c; 
    double km = valueResult/1; 
    DecimalFormat newFormat = new DecimalFormat("####"); 
    int kmInDec = Integer.valueOf(newFormat.format(km)); 
    double meter = valueResult % 1000; 
    int meterInDec = Integer.valueOf(newFormat.format(meter)); 
    Log.i("Radius Value", "" + valueResult + " KM " + kmInDec + " Meter " + meterInDec); 
    ans = Radius * c; 
    // Toast.makeText(getApplicationContext(), "Result" + ans, 
    // Toast.LENGTH_SHORT).show(); 

    // End 

    // 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; 
} 

@Override 
protected void onResume() { 
    // TODO Auto-generated method stub 
    super.onResume(); 

    markerPoints = new ArrayList<LatLng>(); 

    // Getting reference to SupportMapFragment of the 
    // activity_main 

    if (map != null) { 
     Log.e(" in View Map ", " in On Resume Method calling ........."); 
     // if (gps.canGetLocation()) { 
     // latitude2 = gps.getLatitude(); 
     // longitude2 = gps.getLongitude(); 

     // Enable MyLocation Button in the Map 
     map.setMyLocationEnabled(true); 
     // Toast.makeText(getApplicationContext(),"Card Lattitude is 
     // "+gp.getGps_lattitude()+" LOngitude is 
     // "+gp.getGps_longitude(),Toast.LENGTH_LONG).show(); 
     LatLng CardPoint = new LatLng(latitude, longitude); 
     // LatLng CardPoint=new 
     // LatLng(21.237425849325856,72.8330023214221); 

     Log.e(" in View Map ", " in On Card Point........." + CardPoint.latitude); 

     MarkerOptions Destpoint = new MarkerOptions(); 
     Destpoint.position(CardPoint); 
     map.addMarker(Destpoint); 
     map.animateCamera(CameraUpdateFactory.newLatLngZoom(CardPoint, 10)); 
     // Toast.makeText(getApplicationContext(),"Visitor Lattitude is 
     // "+latitude2+" LOngitude is 
     // "+longitude2,Toast.LENGTH_LONG).show(); 
     LatLng UserPoint = new LatLng(latitude2, longitude2); 
     MarkerOptions Sourcepoint = new MarkerOptions(); 
     Sourcepoint.position(UserPoint); 
     map.addMarker(Sourcepoint); 

     String url = getDirectionsUrl(UserPoint, CardPoint); 
     DownloadTask downloadTask = new DownloadTask(); 
     downloadTask.execute(url); 
     // } else { 
     // gps.showSettingsAlert(ViewMapDirection.this); 
     // } 
    } 
} 

// 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 = ""; 
     Log.e(" in View Map ", " in Download Task ........." + url.toString()); 
     try { 
      // Fetching the data from web service 
      data = downloadUrl(url[0]); 
     } catch (Exception e) { 
      Log.e("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(); 
     Log.e(" in View Map ", " in on Post ........."); 
     // 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; 
     Log.e(" in View Map ", " in parser Task Calling ........."); 
     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(); 
     Log.e(" in View Map ", " in parser post ........." + result.size()); 
     // Traversing through all the routes 
     for (int i = 0; i < result.size(); i++) { 
      Log.e(" in View Map ", " in Result For ........."); 
      points = new ArrayList<LatLng>(); 
      lineOptions = new PolylineOptions(); 

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

      Log.e(" in View Map ", " in path ........." + path.size()); 
      // Fetching all the points in i-th route 
      for (int j = 0; j < path.size(); j++) { 
       HashMap<String, String> point = path.get(j); 

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

       Log.e("in View Direction ", " lag ,,,,, " + lat + " lng ... " + lng); 
       points.add(position); 
      } 

      // Adding all the points in the route to LineOptions 
      lineOptions.addAll(points); 
      lineOptions.width(4); 
      lineOptions.color(Color.BLUE); 
     } 

     // Drawing polyline in the Google Map for the i-th route 
     // if (gps.canGetLocation()) { 
     // latitude2 = gps.getLatitude(); 
     // longitude2 = gps.getLongitude(); 
     if (map != null) { 
      if (gps.canGetLocation()) { 
       latitude2 = gps.getLatitude(); 
       longitude2 = gps.getLongitude(); 

       Log.e("View Map Direction ", " get Current Lat lng " + latitude2 + " lng " + longitude2); 
       if ((latitude != 0) && (longitude != 0)) { 
        map.addPolyline(lineOptions); 
       } 
      } else { 
       gps.showSettingsAlert(ViewMapDirection.this, ViewMapDirection.this); 
      } 
     } 
     // } else { 
     // gps.showSettingsAlert(ViewMapDirection.this); 
     // } 
     // onResume(); 
    } 
} 

@Override 
public void onClick(View v) { 
    // TODO Auto-generated method stub 
    switch (v.getId()) { 
    case R.id.btn_onlywebview_close: 
     finish(); 
     break; 
    default: 
     break; 
    } 

} 

} 

在上面的类中阅读正确的评论和关注它，因为这个类正在我当前的项目中运行。 这一套在你的清单文件

<provider 
     android:name="com.facebook.NativeAppCallContentProvider" 
     android:authorities="com.facebook.app.NativeAppCallContentProvider1621374528084848" 
     android:exported="true" /> 

    <meta-data 
     android:name="com.google.android.maps.v2.API_KEY" 
     android:value="your key" /> 

    <meta-data 
     android:name="com.google.android.gms.version" 
     android:value="@integer/google_play_services_version" /> 

和u知道还需要添加到Google Play服务库。