LocationManager和跳跃坐标
看看这个图像。你会看到一些LocationManager如何给出奇怪的坐标。看起来他们跳起来了。但与此同时，本地谷歌地图应用程序显示移动设备的正确位置。LocationManager和跳跃坐标
我使用3款不同的智能手机在Android 7.0.0和7.1.1下测试了应用程序，并获得了相同的结果。
请帮我检查我的代码，看看它仍然丢失了哪些设置。
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;
}
}
回答：
，从智能手机/消费级GPS是相当典型行为。为了减少波动，您需要对结果进行归一化。一种方法是计算从坐标的队列中的地理中心，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<Coordinate> 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;
}
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