我试图递增数组的下一个索引，但它只递增一个索引，然后它将转到0并且它不会转到下一个索引。 以下是示例：http://imgur.com/a/AkHGn
以下是变量：
ArrayList<JSONArray> listOfRouteArray = new ArrayList<>();
private ArrayList<Integer> listOfIndicesOfCurrentRoutes = new ArrayList<>();
private ArrayList<Polyline> polylines = new ArrayList<>();
以下是我的功能：
public void alternateRoute(){
// If the displayed polyline of the route to the first destination is not the last alternative
// polyline, display the next alternative polyline else called the
// incrementRouteIndexOfNextOrderPolyline() function. Take a look at
// incrementRouteIndexOfNextOrderPolyline() and look at this example. example: if we have
// 138 the next count is 139.
if(!listOfRouteArray.isEmpty()){
if((listOfIndicesOfCurrentRoutes.get(0) + 1) <
listOfRouteArray.get(0).length()){
alternatePolyline(0, listOfIndicesOfCurrentRoutes.get(0) + 1);
}
else {
incrementRouteIndexOfNextOrderPolyline(0);
}
}
}
递增索引：
private void incrementRouteIndexOfNextOrderPolyline(int indexOfPolyline){
//sets the polyline of the route to a destination to the first polyline of the list of all
//possible polylines of the route to that destination. Tha is if a digit was 9 set it to 0.
alternatePolyline(indexOfPolyline,0);
//if the route to destination with dealing with is the route to the lastly added destination
//return. that is if the digit is 9 in 9999 return.
if((indexOfPolyline + 1) >= polylines.size()){
return;
}
//if the polyline of the next order route to destination is not that last possible alternative
//polyline for that route, set it to the next possible polyline else increment the index of it's
// next order polyline. that is if we have 118 and we are dealing with 8 make the next count to
// be 119 else we have 119 make it to be 120
if((listOfIndicesOfCurrentRoutes.get(indexOfPolyline + 1) + 1) <
listOfRouteArray.get(indexOfPolyline + 1).length()){
alternatePolyline(indexOfPolyline,
listOfIndicesOfCurrentRoutes.get(indexOfPolyline + 1) + 1);
}else {
incrementRouteIndexOfNextOrderPolyline(indexOfPolyline + 1);
}
这可能需要澄清：
public void alternatePolyline(int indexOfRouteToAlternate, int indexOfNewPolyline){
listOfIndicesOfCurrentRoutes.set(indexOfRouteToAlternate, indexOfNewPolyline);
try {
JSONObject routes = listOfRouteArray.get(indexOfRouteToAlternate).getJSONObject(indexOfNewPolyline);
JSONObject overviewPolylines = routes.getJSONObject("overview_polyline");
String encodedString = overviewPolylines.getString("points");
List<LatLng> list = decodePoly(encodedString);
PolylineOptions options = new PolylineOptions().width(10).color(Color.GREEN).geodesic(true);
for (int z = 0; z < list.size(); z++) {
LatLng point = list.get(z);
options.add(point);
}
polylines.get(indexOfRouteToAlternate).remove();
polylines.set(indexOfRouteToAlternate, mMap.addPolyline(options));
} catch (JSONException e) {
e.printStackTrace();
}
}
我已经在mediafire中上传了整个项目，我个人可以提供源代码来解决这个问题。