使用android上的航点绘制驾驶路线(谷歌地图,谷歌方向API,JSON解析,解码谷歌折线) [英] drawing driving routes using waypoints on android ( Google maps, Google direction api, json parsing, decode google polyline)
本文介绍了使用android上的航点绘制驾驶路线(谷歌地图,谷歌方向API,JSON解析,解码谷歌折线)的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
public void drawPath(String result){
try {
final JSONObject jsonObject = new JSONObject(result );
JSONArray routeArray = jsonObject.getJSONArray(routes);
JSONObject routes = routeArray.getJSONObject(0);
JSONObject overviewPolylines = routes.getJSONObject(overview_polyline);
字符串encodedString = overviewPolylines.getString(points);
String statusString = jsonObject.getString(status);
Log.d(test:,encodedString);
列表< LatLng> list = decodePoly(encodedString);
LatLng last = null;
for(int i = 0; i< list.size() - 1; i ++){
LatLng src = list.get(i);
LatLng dest = list.get(i + 1);
last = dest;
Log.d(Last latLng:,last.latitude +,+ last.longitude);
Polyline line = mMap.addPolyline(new PolylineOptions()
.add(new LatLng(src.latitude,src.longitude),new LatLng(dest.latitude,dest.longitude))
.width(4)
.color(Color.GREEN));
Log.d(Last latLng:,last.latitude +,+ last.longitude);
} catch(JSONException e){
e.printStackTrace();
}
catch(ArrayIndexOutOfBoundsException e){
System.err.println(Caught ArrayIndexOutOfBoundsException:+ e.getMessage());
}
}
私人列表< LatLng> decodePoly(字符串编码){
List< LatLng> poly = new ArrayList< LatLng>();
int index = 0;
int length = encoded.length();
int latitude = 0;
int longitude = 0;
while(index< length){
int b;
int shift = 0;
int result = 0;
do {
b = encoded.charAt(index ++) - 63;
result | =(b& 0x1f)<<转移;
shift + = 5;
} while(b> = 0x20); $(结果& 1)!= 0?〜(结果>> 1):(结果>> 1));
latitude + = destLat;
shift = 0;
结果= 0;
do {
b = encoded.charAt(index ++) - 63;
result | =(b& 0x1f)<<转移;
shift + = 5;
} while(b> 0x20); (结果& 1)!= 0?〜(结果>> 1):(结果>> 1));(b)
longitude + = destLong;
poly.add(new LatLng((latitude / 1E5),(longitude / 1E5)));
}
返回poly;
$ b现在我的问题是路由在地图上显示不正确,因为它有路标在链接中。我在android 4.2上使用它
解决方案我已经测试了您的decodePoly部分。在那里似乎没有问题。你可以使用步骤和腿来更精确。
drawPath() is used to draw polyloine on map.
public void drawPath(String result){
try {
final 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");
String statusString = jsonObject.getString("status");
Log.d("test: ", encodedString);
List<LatLng> list = decodePoly(encodedString);
LatLng last = null;
for (int i = 0; i < list.size()-1; i++) {
LatLng src = list.get(i);
LatLng dest = list.get(i+1);
last = dest;
Log.d("Last latLng:", last.latitude + ", " + last.longitude );
Polyline line = mMap.addPolyline(new PolylineOptions()
.add(new LatLng(src.latitude, src.longitude), new LatLng(dest.latitude, dest.longitude))
.width(4)
.color(Color.GREEN));
}
Log.d("Last latLng:", last.latitude + ", " + last.longitude );
}catch (JSONException e){
e.printStackTrace();
}
catch(ArrayIndexOutOfBoundsException e) {
System.err.println("Caught ArrayIndexOutOfBoundsException: "+ e.getMessage());
}
}
private List<LatLng> decodePoly(String encoded){
List<LatLng> poly = new ArrayList<LatLng>();
int index = 0;
int length = encoded.length();
int latitude = 0;
int longitude = 0;
while(index < length){
int b;
int shift = 0;
int result = 0;
do {
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int destLat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
latitude += destLat;
shift = 0;
result = 0;
do {
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b > 0x20);
int destLong = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
longitude += destLong;
poly.add(new LatLng((latitude / 1E5),(longitude / 1E5) ));
}
return poly;
}
Now my problem is route is not displayed correctly in the map as it has waypoints in the link. I am using it on android 4.2
解决方案 I have tested your decodePoly part. seems no problem there. you can use steps and legs to be more precise.
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