私は最近、作業中のアプリケーションの単純な速度計算に取り組んでいますが、私が持っているコードでは場所を取得するのに時間がかかりすぎて、このような質問が以前に尋ねられたことは知っていますが、答えはありません私が探している結果を取得しているようです。では、どうすればこのコードに数秒以内に gps を修正させることができますか? My LocationListener:
package me.dylan.acf;
import java.text.DecimalFormat;
import java.util.ArrayList;
import android.app.NotificationManager;
import android.location.Location;
import android.location.LocationListener;
import android.os.Bundle;
import android.text.format.Time;
import android.widget.TextView;
public class GPSManager implements LocationListener {
ArrayList<Double> avgspeeds = new ArrayList<Double>();
TextView debug;
NotificationManager mngr;
double avgspeed;
long lastTime = 0;
GraphView view;
Location lastloc;
int earthRadius = 6371;
long delaytime = 30;
ArrayList<Double> allspeeds = new ArrayList<Double>();
public GPSManager(TextView view) {
debug = view;
Location location = ACF.instance.lmanager
.getLastKnownLocation(ACF.instance
.getProperLocationsServices(ACF.instance
.getApplicationContext()));
if (location != null) {
double speed = location.getSpeed();
lastloc = location;
debug.setText("Average Speed: " + avgspeed + "\nCurrent speed: "
+ speed + "\nLocation updates: " + avgspeeds.size());
}
}
@Override
public void onLocationChanged(Location location) {
// DecimalFormat format = new DecimalFormat("0.00");
double speed = location.getSpeed();
if (lastloc != null) {
double latDist = Math.toRadians(location.getLatitude()
- lastloc.getLatitude());
double lonDist = Math.toRadians(location.getLongitude()
- lastloc.getLongitude());
double lat1 = Math.toRadians(location.getLatitude());
double lat2 = Math.toRadians(lastloc.getLatitude());
double a = Math.sin(latDist / 2) * Math.sin(latDist / 2)
+ Math.sin(lonDist / 2) * Math.sin(lonDist / 2)
* Math.cos(lat1) * Math.cos(lat2);
double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
double dist = earthRadius * c;
speed = (dist * 0.621371) / Math.abs(System.currentTimeMillis() - lastTime * 60 * 60 * 60);
lastTime = System.currentTimeMillis();
}
allspeeds.add(speed);
if (allspeeds.size() > 30) {
allspeeds.remove(0);
}
avgspeed = 0;
for (double d : allspeeds) {
avgspeed += d;
}
avgspeed /= allspeeds.size();
// avgspeed = Double.parseDouble(format.format(avgspeed));
avgspeeds.add(avgspeed);
lastloc = location;
debug.setText("Average Speed: " + avgspeed + "\nCurrent speed: "
+ speed + "\nLocation updates: " + avgspeeds.size());
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
私がそれを呼ぶ場所：
public void updateWithProperService() {
lmanager.requestSingleUpdate(
getProperLocationsServices(getApplicationContext()), GPSmngr,
null);
Timer timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
updateWithProperService();
}
}, 10000);
}
public String getProperLocationsServices(Context context) {
if (lmanager == null)
lmanager = (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
int minTime = 3000;
/*
* boolean isGPS = false; boolean isNetwork = false; try { isGPS =
* lmanager.isProviderEnabled(LocationManager.GPS_PROVIDER); } catch
* (Exception e) { e.printStackTrace(); } try { isNetwork = lmanager
* .isProviderEnabled(LocationManager.NETWORK_PROVIDER); } catch
* (Exception e) { e.printStackTrace(); }
*/
List<String> matchingProviders = lmanager.getAllProviders();
Location bestResult = null;
long bestTime = 0;
for (String provider : matchingProviders) {
Location location = lmanager.getLastKnownLocation(provider);
if (location != null) {
// float accuracy = location.getAccuracy();
long time = location.getTime();
// float bestAccuracy;
/*
* if ((time > minTime && accuracy < bestAccuracy )) {
* bestResult = location; bestTime = time; } else
*/if (time < minTime &&
/* bestAccuracy == Float.MAX_VALUE && */time < bestTime) {
bestResult = location;
bestTime = time;
}
}
}
if (bestResult != null)
return bestResult.getProvider();
else
return LocationManager.NETWORK_PROVIDER;
}