LocationManager和跳跃坐标

看看这张图片。 你会看到一些LocationManager如何给出奇怪的坐标。 看起来他们跳了起来。 但同时本机谷歌地图应用程序显示移动设备的正确位置。

我在Android 7.0.0和7.1.1下使用3种不同的智能手机测试了应用程序，并且或多或少得到了相同的结果。

请帮我查看我的代码，看看它仍然缺少哪些设置。

谢谢！

import android.app.Service; import android.content.Context; import android.content.Intent; import android.location.Location; import android.location.LocationManager; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.os.Bundle; import android.os.Handler; import android.os.HandlerThread; import android.os.IBinder; import android.text.format.DateFormat; import android.util.Log; import com.google.gson.Gson; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.math.BigDecimal; import java.math.RoundingMode; import java.net.HttpURLConnection; import java.net.SocketTimeoutException; import java.net.URL; import java.util.Date; public class gps_service2 extends Service { private static final String TAG = "GPS SERVICE"; private LocationManager mLocationManager = null; private static final int LOCATION_INTERVAL = 15000; private static final float LOCATION_DISTANCE = 10f; Context context; private class LocationListener implements android.location.LocationListener { Location mLastLocation; public LocationListener(String provider) { Log.e(TAG, "LocationListener " + provider); mLastLocation = new Location(provider); } @Override public void onLocationChanged(Location location) { Log.e(TAG, "onLocationChanged: " + location); try { ComplexPreferences complexPreferences = ComplexPreferences.getComplexPreferences(context, "App_Settings", 0); AppSettings appSettings = complexPreferences.getObject("App_Settings", AppSettings.class); boolean isMobileDataEnabled = Utils.isMobileDataEnabled(context); if (appSettings != null && (isMobileDataEnabled)) { LocationItem locationItem = new LocationItem(); locationItem.DeviceID = appSettings.getDeviceID(); locationItem.Latitude = Double.toString(location.getLatitude()); locationItem.Longitude = Double.toString(location.getLongitude()); Date d = new Date(); CharSequence timeOfRequest = DateFormat.format("yyyy-MM-dd HH:mm:ss", d.getTime()); locationItem.TimeOfRequest = timeOfRequest.toString(); locationItem.SerialNumber = appSettings.getSerialNumber(); mLastLocation.set(location); Gson gson = new Gson(); String requestObject = gson.toJson(locationItem); Log.d(TAG, "Формирование URL API сервера"); String url = appSettings.getIpAddress() + "/api/staff/savedata"; makeRequest(url, requestObject, dLocation); } } catch (Exception ex) { Log.d(TAG, "Ошибка: " + ex.getMessage()); } } @Override public void onProviderDisabled(String provider) { Log.e(TAG, "onProviderDisabled: " + provider); } @Override public void onProviderEnabled(String provider) { Log.e(TAG, "onProviderEnabled: " + provider); } @Override public void onStatusChanged(String provider, int status, Bundle extras) { Log.e(TAG, "onStatusChanged: " + provider); } } LocationListener[] mLocationListeners = new LocationListener[] { new LocationListener(LocationManager.GPS_PROVIDER), new LocationListener(LocationManager.NETWORK_PROVIDER) }; @Override public IBinder onBind(Intent arg0) { return null; } @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.e(TAG, "onStartCommand"); super.onStartCommand(intent, flags, startId); return START_STICKY; } @Override public void onCreate() { context = this; Log.e(TAG, "onCreate"); initializeLocationManager(); try { mLocationManager.requestLocationUpdates( LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE, mLocationListeners[1]); } catch (java.lang.SecurityException ex) { Log.i(TAG, "fail to request location update, ignore", ex); } catch (IllegalArgumentException ex) { Log.d(TAG, "network provider does not exist, " + ex.getMessage()); } try { mLocationManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE, mLocationListeners[0]); } catch (java.lang.SecurityException ex) { Log.i(TAG, "fail to request location update, ignore", ex); } catch (IllegalArgumentException ex) { Log.d(TAG, "gps provider does not exist " + ex.getMessage()); } } @Override public void onDestroy() { Log.e(TAG, "onDestroy"); super.onDestroy(); if (mLocationManager != null) { for (int i = 0; i < mLocationListeners.length; i++) { try { mLocationManager.removeUpdates(mLocationListeners[i]); } catch (Exception ex) { Log.i(TAG, "fail to remove location listners, ignore", ex); } } } } private void initializeLocationManager() { Log.e(TAG, "initializeLocationManager"); if (mLocationManager == null) { mLocationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE); } } public static double round(double value, int places) { if (places < 0) throw new IllegalArgumentException(); BigDecimal bd = new BigDecimal(value); bd = bd.setScale(places, RoundingMode.HALF_UP); return bd.doubleValue(); } public void makeRequest(String uri, String json, DLocation dLocation) { HandlerThread handlerThread = new HandlerThread("URLConnection"); handlerThread.start(); Handler mainHandler = new Handler(handlerThread.getLooper()); Runnable myRunnable = createRunnable(uri, json, dLocation); mainHandler.post(myRunnable); } private Runnable createRunnable(final String uri, final String data,final DLocation dLocation){ Runnable aRunnable = new Runnable(){ public void run(){ try { //Connect HttpURLConnection urlConnection; urlConnection = (HttpURLConnection) ((new URL(uri).openConnection())); urlConnection.setDoOutput(true); urlConnection.setRequestProperty("Content-Type", "application/json"); urlConnection.setRequestProperty("Accept", "application/json"); urlConnection.setRequestMethod("POST"); urlConnection.setConnectTimeout(12000); urlConnection.setReadTimeout(10000); urlConnection.connect(); //Write OutputStream outputStream = urlConnection.getOutputStream(); BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8")); try { writer.write(data); } catch (IOException e) { e.printStackTrace(); Log.d(TAG,"Ошибка записи в буфер для пережачи по HTTP"); } writer.close(); outputStream.close(); //Read BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream(), "UTF-8")); String line = null; StringBuilder sb = new StringBuilder(); while ((line = bufferedReader.readLine()) != null) { sb.append(line); } bufferedReader.close(); String result = sb.toString(); Log.d(TAG, result); } catch (SocketTimeoutException e){ e.printStackTrace(); Log.d(TAG, "Ошибка HTTP " + e.getMessage()); } catch( Exception e){ e.printStackTrace(); } } }; return aRunnable; } } 

Answer 1

这是智能手机/消费级GPS的典型行为。 要减少波动，您需要将结果标准化。 一种方法是从坐标队列计算地理中心，例如： https ： //github.com/Esri/cordova-plugin-advanced-geolocation/blob/master/src/com/esri/cordova/geolocation/utils /GeodataHelper.java#L56

 public class Coordinate { public double latitude; public double longitude; public float accuracy; } public static Coordinate getGeographicCenter(final ConcurrentLinkedQueue queue){ double x = 0; double y = 0; double z = 0; float accuracy = 0; int radiusKM = 6367; for(final Coordinate coordinate : queue){ accuracy += coordinate.accuracy; // Convert latitude and longitude to radians final double latRad = Math.PI * coordinate.latitude / 180; final double lonRad = Math.PI * coordinate.longitude / 180; // Convert to cartesian coords x += radiusKM * Math.cos(latRad) * Math.cos(lonRad); y += radiusKM * Math.cos(latRad) * Math.sin(lonRad); z += radiusKM * Math.sin(latRad); } // Get our averages final double xAvg = x / queue.size(); final double yAvg = y / queue.size(); final double zAvg = z / queue.size(); final float accuracyAvg = accuracy / queue.size(); // Convert cartesian back to radians final double sphericalLatRads = Math.asin(zAvg / radiusKM); final double sphericalLonRads = Math.atan2(yAvg, xAvg); // Convert radians back to latitude and longitude Coordinate centerPoint = new Coordinate(); centerPoint.latitude = sphericalLatRads * (180 / Math.PI); centerPoint.longitude = sphericalLonRads * (180 / Math.PI); centerPoint.accuracy = accuracyAvg; return centerPoint; }