android – 任何人都可以指导我如何使用JSON在两个位置之间获取Google方向
作者：互联网
我听说自2012年7月27日以来KML文件已不再可用(因为Google已经改变了检索Google方向的结构,现在你只能通过JSON或XML获取它)
所以PLZ指导我如何在2个位置之间建立道路.
以下代码工作精细NW享受GUYS
这是我的代码：
我提到这个链接：http://www.androidhive.info/2012/08/android-working-with-google-places-and-maps-tutorial/
PlacesMapActivity.java
在下面的代码中,它显示2点之间的直线.
public class PlacesMapActivity extends MapActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map_places);
Intent i = getIntent(); // Getting intent data
String user_latitude = i.getStringExtra("user_latitude");// Users current geo location
String user_longitude = i.getStringExtra("user_longitude");//Userscurrent geo location
nearPlaces = (PlacesList) i.getSerializableExtra("near_places");// Nearplaces list
mapView = (MapView) findViewById(R.id.mapView);
mapView.setBuiltInZoomControls(true);
mapOverlays = mapView.getOverlays();
geoPoint = new GeoPoint((int) (Double.parseDouble(user_latitude) * 1E6), (int) (Double.parseDouble(user_longitude) * 1E6));// Geopoint to place on map
geoPoint1 = new GeoPoint((int) (Double.parseDouble("12.930621") * 1E6),
(int) (Double.parseDouble("77.581710") * 1E6));//Geopoint to Clientplace on map
Drawable drawable_user = this.getResources()
.getDrawable(R.drawable.mark_red); // Drawable marker icon
Drawable drawable_client = this.getResources()
.getDrawable(R.drawable.mark_blue); // Drawable Client icon
Drawable drawable = this.getResources()
.getDrawable(R.drawable.clientflag); // Drawable marker icon
// 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 client 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();
}
// 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();
myoverlay = new MyOverlay();
mapOverlays.add(myoverlay);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.activity_main, menu);
return true;
}
/**
* Event Handling for Individual menu item selected
* Identify single menu item by it's id
* */
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.mylocation:
// Single menu item is selected do something
Toast.makeText(PlacesMapActivity.this, "Moving To Current location", Toast.LENGTH_SHORT).show();
// geoPoint.gpsCurrentLocation();
return true;
case R.id.mapStreet:
Toast.makeText(PlacesMapActivity.this, "Map Normal Street View", Toast.LENGTH_SHORT).show();
if(mapView.isSatellite()==true){
mapView.setSatellite(false);
}
return true;
case R.id.mapSatellite:
Toast.makeText(PlacesMapActivity.this, "Map Satellite View", Toast.LENGTH_SHORT).show();
if(mapView.isSatellite()==false){
mapView.setSatellite(true);
}
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
protected boolean isRouteDisplayed() {
return false;
}
add this road route
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);
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();
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));
urlString.append("&destination=");// to
urlString.append(Double.toString((double) destgeoPoint.getLatitudeE6() / 1.0E6));
urlString.append(",");
urlString.append(Double.toString((double) destgeoPoint.getLongitudeE6() / 1.0E6));
/* urlString.append("&destination=");// searchto
urlString.append(Double.toString((double) destgeopointsearch.getLatitudeE6() / 1.0E6));
urlString.append(",");
urlString.append(Double.toString((double) destgeopointsearch.getLongitudeE6() / 1.0E6));
*/
urlString.append("&sensor=false");
Log.d("xxx", "URL=" + urlString.toString());
return urlString.toString();
}
在最后我有两点之间的道路路线图..添加此代码.
class MyOverLay extends Overlay {
private int pathColor;
private final List<GeoPoint> points;
private boolean drawStartEnd;
public MyOverLay(List<GeoPoint> pointToDraw) {
this(pointToDraw, Color.MAGENTA, true);
}
public MyOverLay(List<GeoPoint> points, int pathColor, boolean drawStartEnd) {
this.points = points;
this.pathColor = pathColor;
this.drawStartEnd = drawStartEnd;
}
private void drawOval(Canvas canvas, Paint paint, Point point) {
Paint ovalPaint = new Paint(paint);
ovalPaint.setStyle(Paint.Style.FILL_AND_STROKE);
ovalPaint.setStrokeWidth(2);
ovalPaint.setColor(Color.BLUE);
int _radius = 6;
RectF oval = new RectF(point.x - _radius, point.y - _radius,
point.x + _radius, point.y + _radius);
canvas.drawOval(oval, ovalPaint);
}
public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
long when) {
Projection projection = mapView.getProjection();
if (shadow == false && points != null) {
Point startPoint = null, endPoint = null;
Path path = new Path();
// We are creating the path
for (int i = 0; i < points.size(); i++) {
GeoPoint gPointA = points.get(i);
Point pointA = new Point();
projection.toPixels(gPointA, pointA);
if (i == 0) { // This is the start point
startPoint = pointA;
path.moveTo(pointA.x, pointA.y);
} else {
if (i == points.size() - 1)// This is the end point
endPoint = pointA;
path.lineTo(pointA.x, pointA.y);
}
}
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(pathColor);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(5);
paint.setAlpha(90);
if (getDrawStartEnd()) {
if (startPoint != null) {
drawOval(canvas, paint, startPoint);
}
if (endPoint != null) {
drawOval(canvas, paint, endPoint);
}
}
if (!path.isEmpty())
canvas.drawPath(path, paint);
}
return super.draw(canvas, mapView, shadow, when);
}
public boolean getDrawStartEnd() {
return drawStartEnd;
}
public void setDrawStartEnd(boolean markStartEnd) {
drawStartEnd = markStartEnd;
}
}
}
解决方法:
自Google关闭KML以来,您可以看到我的帖子here以及如何在JSON中完成答案的完整答案.
标签：kml,android,json,google-maps 来源： https://codeday.me/bug/20191003/1846447.html