最简单的方法（如果您没有那么多折线）是使用 Google Maps Roads API part Snap to Road which

为给定的 GPS 坐标集返回最适合的道路几何形状。 此服务最多需要沿路线收集 100 个 GPS 点，并且 返回一组相似的数据，其中的点被捕捉到最多 车辆行驶的可能道路。

喜欢在this example：

public class MainActivity extends AppCompatActivity implements OnMapReadyCallback {

    private GoogleMap mGoogleMap;
    private MapFragment mapFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mapFragment = (MapFragment) getFragmentManager()
                .findFragmentById(R.id.map_fragment);
        mapFragment.getMapAsync(this);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mGoogleMap = googleMap;

        List<LatLng> sourcePoints = new ArrayList<>();
        sourcePoints.add(new LatLng(<COORDINATES_OF_POLYLINE>));
        ...
        sourcePoints.add(new LatLng(<COORDINATES_OF_POLYLINE>));

        PolylineOptions polyLineOptions = new PolylineOptions();
        polyLineOptions.addAll(sourcePoints);
        polyLineOptions.width(5);
        polyLineOptions.color(Color.BLUE);
        mGoogleMap.addPolyline(polyLineOptions);

        mGoogleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(sourcePoints.get(0),15));

        List<LatLng> snappedPoints = new ArrayList<>();
        new GetSnappedPointsAsyncTask().execute(sourcePoints,null,snappedPoints);
    }


    private String buildRequestUrl(List<LatLng> trackPoints) {
        StringBuilder url = new StringBuilder();
        url.append("https://roads.googleapis.com/v1/snapToRoads?path=");

        for (LatLng trackPoint : trackPoints) {
            url.append(String.format("%8.5f",trackPoint.latitude));
            url.append(",");
            url.append(String.format("%8.5f",trackPoint.longitude));
            url.append("|");
        }
        url.delete(url.length() - 1,url.length());
        url.append("&interpolate=true");
        url.append(String.format("&key=%s",<your_Google_Maps_API_key>);

        return url.toString();
    }


    private class GetSnappedPointsAsyncTask extends AsyncTask<List<LatLng>,Void,List<LatLng>> {

        protected void onPreExecute() {
            super.onPreExecute();
        }

        protected List<LatLng> doInBackground(List<LatLng>... params) {

            List<LatLng> snappedPoints = new ArrayList<>();

            HttpURLConnection connection = null;
            BufferedReader reader = null;

            try {
                URL url = new URL(buildRequestUrl(params[0]));
                connection = (HttpURLConnection) url.openConnection();
                connection.setRequestMethod("GET");
                connection.connect();

                InputStream stream = connection.getInputStream();

                reader = new BufferedReader(new InputStreamReader(stream));
                StringBuilder jsonStringBuilder = new StringBuilder();

                StringBuffer buffer = new StringBuffer();
                String line = "";

                while ((line = reader.readLine()) != null) {
                    buffer.append(line+"\n");
                    jsonStringBuilder.append(line);
                    jsonStringBuilder.append("\n");
                }

                JSONObject jsonObject = new JSONObject(jsonStringBuilder.toString());
                JSONArray snappedPointsArr = jsonObject.getJSONArray("snappedPoints");

                for (int i = 0; i < snappedPointsArr.length(); i++) {
                    JSONObject snappedPointLocation = ((JSONObject) (snappedPointsArr.get(i))).getJSONObject("location");
                    double lattitude = snappedPointLocation.getDouble("latitude");
                    double longitude = snappedPointLocation.getDouble("longitude");
                    snappedPoints.add(new LatLng(lattitude,longitude));
                }

            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (JSONException e) {
                e.printStackTrace();
            } finally {
                if (connection != null) {
                    connection.disconnect();
                }
                try {
                    if (reader != null) {
                        reader.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            return snappedPoints;
        }

        @Override
        protected void onPostExecute(List<LatLng> result) {
            super.onPostExecute(result);

            PolylineOptions polyLineOptions = new PolylineOptions();
            polyLineOptions.addAll(result);
            polyLineOptions.width(5);
            polyLineOptions.color(Color.RED);
            mGoogleMap.addPolyline(polyLineOptions);

            LatLngBounds.Builder builder = new LatLngBounds.Builder();
            builder.include(result.get(0));
            builder.include(result.get(result.size()-1));
            LatLngBounds bounds = builder.build();
            mGoogleMap.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds,10));

        }
    }

}

（为此，您需要在 Google Cloud Console 中为您的项目添加 Google Maps Roads API 支持）

在您使用 Snap To Road 处理所有“初始”多段线后，所有这些多段线都应该完全重叠，您可以使用 Polyline 的 Z-Index 属性来管理多段线的 Z 顺序。

其他方法是“手动”检测折线的重叠。在这种情况下，您应该：

1. 决定如何确定应显示在其他多段线之上的“主”多段线（最长或具有最多点数或其他内容）；
2. 对于“非主”折线的每个点检查是否在“主”折线上（您可以使用isLocationOnPath()的PolyUtil library方法）并根据检查选择线段的颜色结果：如果点在“主要”路径上（在以米为单位的指定容差范围内），则不应显示“非主要”折线段或以其他方式显示所选颜色。