我很长时间都在尝试这个，所以我在这里寻求一些认真的帮助!!
在我的应用程序中，我想在点击一个按钮时绘制两个以上的替代路线，比如在我的应用程序中我有3个按钮，例如r1，r2和r3。当我在我的应用程序各自的edittexts中输入源位置和目标位置时然后单击输入然后我将默认情况下绘制r1所以现在当我点击r2按钮时，先前在地图上绘制的路径/路线应该被删除/删除，并且新的替代路径/路线应该绘制在地图上但不会发生它不是擦除以前的路径/路线，而是在地图上绘制两条路线:(有人可以帮帮我吗？
这是我的代码。
List<RoutesDictionary> routeDicList = new ArrayList<RoutesDictionary>();
routeTwo.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
map.clear();
routeDicList.clear();
routeType = 2;
rout = "walking";
new TrafficData().execute();
Log.d("TH routeTwo", "In routeTwo After" +
`enter code here`routeDicList.size());
}
});
public class TrafficData extends AsyncTask<Context, String, String> {
routeTwo.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
map.clear();
routeDicList.clear();
routeType = 2;
rout = "walking";
new TrafficData().execute();
}
});
@Override
protected String doInBackground(Context... params) {
try {
if (!via_route.equals("")) {
url = "http://maps.googleapis.com/maps/api/directions/json?origin="
+ sourceAdd
+ "&destination="
+ destinationAdd
+ "&waypoints=via:"
+ via_route
+ "&sensor=false&mode=" + rout;
} else {
url = "http://maps.googleapis.com/maps/api/directions/json?origin="
+ sourceAdd
+ "&destination="
+ destinationAdd
+ "&sensor=false&mode=" + rout;
}
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpPost = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
result = EntityUtils.toString(httpResponse.getEntity());
Log.v("Traffic App : ", "The Traffic App result is : "
+ result);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
Log.v("Traffic App : ", "The Traffic App resultTraffic is : "
+ resultTraffic);
try {
JSONObject routesObj = new JSONObject(result);
String status = routesObj.getString("status");
if (status.equals("OK")) {
routesDictionary = new RoutesDictionary();
allRouteDic.addSrcAddress(sourceAdd);
allRouteDic.addDesAddress(destinationAdd);
AllRoutes.allRoutes.add(allRouteDic);
Log.v("***********************", "THE ***** Array list : ");
JSONArray routesArr = routesObj.getJSONArray("routes");
JSONObject mainObj = routesArr.getJSONObject(0);
JSONArray legsArr = mainObj.getJSONArray("legs");
int legsSize = legsArr.length();
for (int i = 0; i < legsSize; i++) {
routesDictionary.addlegsDistance(legsArr.getJSONObject(
i).getJSONObject("distance"));
routesDictionary.addlegsDuration(legsArr.getJSONObject(
i).getJSONObject("duration"));
routesDictionary.addlegsEndaddress(legsArr
.getJSONObject(i).getString("end_address"));
routesDictionary
.addlegsEndlocation(legsArr.getJSONObject(i)
.getJSONObject("end_location"));
routesDictionary.addlegsStartaddress(legsArr
.getJSONObject(i).getString("start_address"));
routesDictionary.addlegsStartlocation(legsArr
.getJSONObject(i).getJSONObject(
"start_location"));
routeDicList.add(routesDictionary);
JSONArray stepsArr = legsArr.getJSONObject(i)
.getJSONArray("steps");
int stepsLen = stepsArr.length();
for (int j = 0; j < stepsLen; j++) {
routesDictionary
.addlegs_StepsDistance(stepsArr
.getJSONObject(j).getJSONObject(
"distance"));
routesDictionary
.addlegs_StepsDuration(stepsArr
.getJSONObject(j).getJSONObject(
"duration"));
routesDictionary.addlegs_StepsEndlocation(stepsArr
.getJSONObject(j).getJSONObject(
"end_location"));
routesDictionary.addlegs_StepsHtmlInstruct(stepsArr
.getJSONObject(j).getString(
"html_instructions"));
routesDictionary
.addlegs_StepsPloyline(stepsArr
.getJSONObject(j).getJSONObject(
"polyline"));
routesDictionary
.addlegs_StepsStartlocation(stepsArr
.getJSONObject(j).getJSONObject(
"start_location"));
routesDictionary.addlegs_StepsTravelmode(stepsArr
.getJSONObject(j).getString("travel_mode"));
routeDicList.add(routesDictionary);
}
}
int strLoc = routeDicList.get(0)
.getlegs_StepsStartlocation().size();
for (int k = 0; k < strLoc; k++) {
routesDictionary.addStrLatit(routeDicList.get(0)
.getlegs_StepsStartlocation().get(k)
.getString("lat"));
routesDictionary.addStrlongi(routeDicList.get(0)
.getlegs_StepsStartlocation().get(k)
.getString("lng"));
routeDicList.add(routesDictionary);
}
int endLoc = routeDicList.get(0).getlegs_StepsEndlocation()
.size();
for (int l = 0; l < endLoc; l++) {
routesDictionary.addEndLatit(routeDicList.get(0)
.getlegs_StepsEndlocation().get(l)
.getString("lat"));
routesDictionary.addEndLongi(routeDicList.get(0)
.getlegs_StepsEndlocation().get(l)
.getString("lng"));
routeDicList.add(routesDictionary);
}
int strL = routeDicList.get(0).getStrLatit().size();
for (int m = 0; m < strL; m++) {
Log.v("Traffic : ", "*** Latitude and Longi *** : "
+ routeDicList.get(0).getStrLatit().get(m)
+ " "
+ routeDicList.get(0).getStrLong().get(m));
}
int endL = routeDicList.get(0).getEndLatit().size();
for (int m = 0; m < endL; m++) {
Log.v("Traffic : ", "### Latitude and Longi ### : "
+ routeDicList.get(0).getEndLatit().get(m)
+ " "
+ routeDicList.get(0).getEndLong().get(m));
}
rectOptions = new PolylineOptions();
Log.v("*****************", "The RECTPOINTS SIZE : "
+ rectOptions.getPoints().size());
rectOptions.getPoints().clear();
switch (routeType) {
case 1:
rectOptions.color(Color.RED);
break;
case 2:
rectOptions.color(Color.BLUE);
break;
case 3:
rectOptions.color(Color.GREEN);
break;
default:
break;
}
rectOptions.width(4);
for (int i = 1; i < strL; i++) {
rectOptions.add(new LatLng(Double.valueOf(routeDicList
.get(0).getStrLatit().get(i)), Double
.valueOf(routeDicList.get(0).getStrLong()
.get(i))));
}
// Get back the mutable Polygon
map.clear();
polyline = map.addPolyline(rectOptions.geodesic(false));
polyline.remove();
polyline = map.addPolyline(rectOptions.geodesic(true));
double lng = Double.valueOf(routeDicList.get(0)
.getlegs_StepsStartlocation().get(0)
.getString("lng"));
double lat = Double.valueOf(routeDicList.get(0)
.getlegs_StepsStartlocation().get(0)
.getString("lat"));
map.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(lat, lng), 14.0f));
// start longitude and latitude
double startlng = Double
.valueOf(routeDicList.get(0)
.getlegs_StepsEndlocation().get(0)
.getString("lng"));
double startlat = Double
.valueOf(routeDicList.get(0)
.getlegs_StepsEndlocation().get(0)
.getString("lat"));
// start location marker
addMarker(startlat, startlng);
// end longitude and latitude
double endlng = Double.valueOf(routeDicList.get(0)
.getlegs_StepsStartlocation().get(endLoc - 1)
.getString("lng"));
double endlat = Double.valueOf(routeDicList.get(0)
.getlegs_StepsStartlocation().get(endLoc - 1)
.getString("lat"));
// end location marker
addMarker(endlat, endlng);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
答案 0 :(得分：0)
1-您在主类中为 routeTwo 按钮设置OnClickListener两次，在 AsyncTask 中设置一个， AsyncTask中的一个应该删除。
2-快速按两次按钮会产生问题，因为你将分别启动两个 AsyncTasks ，每个人都会绘制一条路线，这样就会显示两条路线，我更喜欢只使用一个 AsyncTask 作为全局变量，在运行新的变量之前检查是否有正在运行的 AsyncTask ，这可以通过
if(trafficData != null && trafficData.getStatus() != AsyncTask.Status.FINISHED){
trafficData .cancel(true);
}