當前位置與搜索地點之間的公路/路線圖

Question

以下是執行2點(origin, current location){geoPoint, "current Location"}至Destination.{geoPoint1, "Desti Location2"}之間道路路徑或路線路徑的代碼。它對我來說工作得很好。

我的問題是如何處理當前位置到搜索位置之間的路徑路徑。這裏我是按鈕搜索位置的onClick，它顯示完美，但是我在參考 - >{current location(scrgeoPoint) to searched location(destgeopointsearch)}之間的路線圖中出現錯誤。

有人有什麼想法嗎？

//search button onclick 
    mapLocationBtn = (Button) findViewById(R.id.locationbutton); 
    mapLocationBtn.setVisibility(View.INVISIBLE); 
    mapLocationBtn.setOnClickListener(new View.OnClickListener() {    
      @Override 
      public void onClick(View v) {   
       String usrLoc = autoCompletetextView.getText().toString(); 
       Geocoder gc = new Geocoder(PlacesMapActivity.this);     
       try { 
        addr=gc.getFromLocationName(usrLoc, 3);//maximum 2 results 
        if(addr.size()>0){ 
         address=addr.get(0);//get the first result 
         convertLongi=address.getLongitude(); 
         convertLati=address.getLatitude(); 
         geopointsearch = new GeoPoint((int)(convertLati * 1E6), (int)(convertLongi * 1E6));          

        // Map geopointsearch overlay item 
         itemizedOverlay2 = new AddItemizedOverlay(drawable_client, PlacesMapActivity.this);  
         overlayitem = new OverlayItem(geopointsearch, "Your Location3", "R u Searching For me!"); 
         itemizedOverlay2.addOverlay(overlayitem);  
         mapOverlays.add(itemizedOverlay2); 
         itemizedOverlay2.populateNow(); 
         mc.animateTo(geopointsearch); 
        // mc.zoomIn(); 
        }      
       } catch (IOException e) {     
        e.printStackTrace(); 
       } 
      }         
     }); 

    // Map overlay item 
    itemizedOverlay = new AddItemizedOverlay(drawable_user, this); 
    overlayitem = new OverlayItem(geoPoint, "Your Location","That is you!"); 
    itemizedOverlay.addOverlay(overlayitem);   
    mapOverlays.add(itemizedOverlay); 
    itemizedOverlay.populateNow();  
    // Map client overlay item 
    itemizedOverlay1 = new AddItemizedOverlay(drawable_client, this);  
    overlayitem1 = new OverlayItem(geoPoint1, "Your Location2", "I am ur client!"); 
    itemizedOverlay1.addOverlay(overlayitem1);    
    mapOverlays.add(itemizedOverlay1); 
    itemizedOverlay1.populateNow(); 
    // Map near overlay item  
    itemizedOverlay = new AddItemizedOverlay(drawable, this); 

    mc = mapView.getController(); 

    // These values are used to get map boundary area 
    // The area where you can see all the markers on screen 
    int minLat = Integer.MAX_VALUE; 
    int minLong = Integer.MAX_VALUE; 
    int maxLat = Integer.MIN_VALUE; 
    int maxLong = Integer.MIN_VALUE; 

    // check for null in case it is null 
    if (nearPlaces.results != null) { 
     // loop through all the places 
     for (Place place : nearPlaces.results) { 
      latitude = place.geometry.location.lat; // latitude 
      longitude = place.geometry.location.lng; // longitude 

      // Geopoint to place on map 
      geoPoin = new GeoPoint((int) (latitude * 1E6), 
        (int) (longitude * 1E6)); 

      // Map overlay item 
      overlayitem = new OverlayItem(geoPoin, place.name, 
        place.vicinity); 

      itemizedOverlay.addOverlay(overlayitem); 

      // calculating map boundary area 
      minLat = (int) Math.min(geoPoin.getLatitudeE6(), minLat); 
      minLong = (int) Math.min(geoPoin.getLongitudeE6(), minLong); 
      maxLat = (int) Math.max(geoPoin.getLatitudeE6(), maxLat); 
      maxLong = (int) Math.max(geoPoin.getLongitudeE6(), maxLong); 
     } 
     mapOverlays.add(itemizedOverlay); 

     // showing all overlay items 
     itemizedOverlay.populateNow(); 
    } 

    DrawPath(geoPoint, geoPoint1, geopointsearch, Color.GREEN, mapView); 

    // Adjusting the zoom level so that you can see all the markers on map 
    mapView.getController().zoomToSpan(Math.abs(minLat - maxLat), Math.abs(minLong - maxLong)); 

    // Showing the center of the map 
    mc.animateTo(new GeoPoint((maxLat + minLat)/2, (maxLong + minLong)/2)); 
    mc.animateTo(geoPoint1); 

    mapView.postInvalidate(); 

} 

private void DrawPath(GeoPoint scrgeoPoint, GeoPoint destgeoPoint, GeoPoint destgeopointsearch, int green, MapView mMapView) { 
    HttpClient httpclient = new DefaultHttpClient(); 
     HttpPost httppost = new HttpPost(makeUrl(scrgeoPoint, destgeoPoint, destgeopointsearch)); 
     HttpResponse response; 
     try { 
      response = httpclient.execute(httppost); 

      HttpEntity entity = response.getEntity(); 
      InputStream is = null; 
      is = entity.getContent(); 
      BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8); 
      StringBuilder sb = new StringBuilder(); 
      sb.append(reader.readLine() + "\n"); 
      String line = "0"; 
      while ((line = reader.readLine()) != null) { 
       sb.append(line + "\n"); 
      } 
      is.close(); 
      reader.close(); 
      String result = sb.toString(); 
      JSONObject jsonObject = new JSONObject(result); 
      JSONArray routeArray = jsonObject.getJSONArray("routes"); 
      JSONObject routes = routeArray.getJSONObject(0); 

      // calculate the distance between 2 point 
      JSONArray legs = routes.getJSONArray("legs"); 
      Log.d("JSON","legs: "+legs.toString()); 
      JSONObject steps = legs.getJSONObject(0); 
      Log.d("JSON","steps: "+steps.toString()); 
      JSONObject distance = steps.getJSONObject("distance"); 
      Log.d("JSON","distance: "+distance.toString()); 
      String sDistance = distance.getString("text"); 
      int iDistance = distance.getInt("value");       
      distextView = (TextView) findViewById(R.id.distextView); 
      distextView.setText(distance.getString("text")); 

      JSONObject overviewPolylines = routes.getJSONObject("overview_polyline"); 
      String encodedString = overviewPolylines.getString("points"); 
      List<GeoPoint> pointToDraw = decodePoly(encodedString); 
      mMapView.getOverlays().add(new MyOverLay(pointToDraw)); 

      } catch (ClientProtocolException e) {    
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 

private List<GeoPoint> decodePoly(String encoded) { 
    List<GeoPoint> poly = new ArrayList<GeoPoint>(); 
     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; 

      GeoPoint p = new GeoPoint((int) (((double) lat/1E5) * 1E6), 
        (int) (((double) lng/1E5) * 1E6)); 
      poly.add(p); 
     } 
     return poly; 
    } 

private String makeUrl(GeoPoint scrgeoPoint, GeoPoint destgeoPoint, GeoPoint destgeopointsearch) { 
    StringBuilder urlString = new StringBuilder(); 

    //Origin 
    urlString.append("http://maps.googleapis.com/maps/api/directions/json"); 
    urlString.append("?origin=");// from 
    urlString.append(Double.toString((double) scrgeoPoint.getLatitudeE6()/1.0E6)); 
    urlString.append(","); 
    urlString.append(Double.toString((double) scrgeoPoint.getLongitudeE6()/1.0E6)); 
    //Destination 
    urlString.append("&destination=");// to 
    urlString.append(Double.toString((double) destgeoPoint.getLatitudeE6()/1.0E6)); 
    urlString.append(","); 
    urlString.append(Double.toString((double) destgeoPoint.getLongitudeE6()/1.0E6)); 
    //search location 
    urlString.append("&destination=");// to 
    urlString.append(Double.toString((double) destgeopointsearch.getLatitudeE6()/1.0E6)); 
    urlString.append(","); 
    urlString.append(Double.toString((double) destgeopointsearch.getLongitudeE6()/1.0E6)); 


    urlString.append("&mode=walking&sensor=true");    
    Log.d("xxx", "URL=" + urlString.toString()); 
    return urlString.toString(); 
} 

Answer 1

據我瞭解，你需要保存你的位置和目的地，然後問谷歌的方向，可能是這樣的：（從this後兩者）

Intent intent = new Intent(android.content.Intent.ACTION_VIEW, 
Uri.parse("http://maps.google.com/maps?saddr=20.344,34.34&daddr=20.5666,45.345")); 
startActivity(intent); 

然後，您需要在許多點（從Google獲得）之間繪製線條/路徑，以實現路徑而不會穿過建築物和拐角。也許這代碼可能是勵志您：

private List<Overlay> mapOverlays; 

private Projection projection; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.main); 

linearLayout = (LinearLayout) findViewById(R.id.zoomview); 
mapView = (MapView) findViewById(R.id.mapview); 
mapView.setBuiltInZoomControls(true); 

mapOverlays = mapView.getOverlays();   
projection = mapView.getProjection(); 
mapOverlays.add(new MyOverlay());   

} 

@Override 
protected boolean isRouteDisplayed() { 
return false; 
} 

class MyOverlay extends Overlay{ 

public MyOverlay(){ 

} 

public void draw(Canvas canvas, MapView mapv, boolean shadow){ 
    super.draw(canvas, mapv, shadow); 

    Paint mPaint = new Paint(); 
    mPaint.setDither(true); 
    mPaint.setColor(Color.RED); 
    mPaint.setStyle(Paint.Style.FILL_AND_STROKE); 
    mPaint.setStrokeJoin(Paint.Join.ROUND); 
    mPaint.setStrokeCap(Paint.Cap.ROUND); 
    mPaint.setStrokeWidth(2); 

    GeoPoint gP1 = new GeoPoint(19240000,-99120000); 
    GeoPoint gP2 = new GeoPoint(37423157, -122085008); 

    Point p1 = new Point(); 
    Point p2 = new Point(); 
    Path path = new Path(); 

    projection.toPixels(gP1, p1); 
    projection.toPixels(gP2, p2); 

    path.moveTo(p2.x, p2.y); 
    path.lineTo(p1.x,p1.y); 

    canvas.drawPath(path, mPaint); 
} 

（從this後服用。）