計算行進距離（而不是兩者之間的距離）

Question

我需要計算乘車的距離！ 沒有距離，沒有距離。 如果我們通過Google提供的API計算距離，則距離可以完全不同。 Google可以從一個點到另一點提供1公里，但汽車可以按照騎手想要的方式行駛800米。 使用加速度計沒有幫助。 它適用於步行，但永遠不會加快速度。

關於如何獲得汽車行駛距離的任何建議？

我已經嘗試過使用Google的Location API：distanceTo或distanceBetween根本不是一個選項。 與IN REAL相比，它可以提供明顯不同的結果。 在真正的汽車中，可以穿越非常短的地方並在800米內達到目標，而Google可以在兩個位置之間提供1公里的距離。

下面是我的應用程序的代碼。 速度非常正確。

class HomeScreen : AppCompatActivity(), GoogleApiClient.ConnectionCallbacks,
    GoogleApiClient.OnConnectionFailedListener, SensorEventListener {
    override fun onSensorChanged(event: SensorEvent?) {
        val sensor = event?.sensor
        val values = event?.values
        var value = -1

        if (values != null && values.size ?: 0 > 0) {
            value = values[0].toInt()
        }


        if (sensor != null &&
            sensor.type == Sensor.TYPE_STEP_DETECTOR
        ) {
            val finalSteps = getDistanceRun(steps)
            val finalStepsTruncated = String.format("%.2f", finalSteps)
            distanceTV.text = "$finalStepsTruncated"
            steps++
        }
    }

    override fun onAccuracyChanged(p0: Sensor?, p1: Int) {

    }

    override fun onConnectionFailed(p0: ConnectionResult) {
        val failed = p0
    }

    @SuppressLint("MissingPermission")
    override fun onConnected(p0: Bundle?) {
        if (locationPermissionsGranted(this)) {
            fusedLocationClient?.requestLocationUpdates(locationRequest, object : LocationCallback() {
                override fun onLocationResult(p0: LocationResult?) {
                    val location = p0
                    val metersPerSecond: Float = location?.lastLocation?.speed ?: 0f
                    val speed = metersPerSecond * 3600 / 1000
                    speedTV.text = "${Math.round(speed)} KM/H"
                }
            }, null)

        } else {
            requestPermission(
                this, 0,
                Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION
            )
        }
    }

    override fun onConnectionSuspended(p0: Int) {
        val suspended = p0
    }

    private var fusedLocationClient: FusedLocationProviderClient? = null
    private var mGoogleApiClient: GoogleApiClient? = null
    private lateinit var locationRequest: LocationRequest
    private var steps: Long = 0

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_home_screen)
        locationRequest = LocationRequest()
        locationRequest.priority = LocationRequest.PRIORITY_HIGH_ACCURACY;
        locationRequest.interval = 1000
        locationRequest.fastestInterval = 500

        if (PermissionManager.locationPermissionsGranted(this)) {
            mGoogleApiClient = GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build()

            mGoogleApiClient?.connect()
            fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
            createLocationRequest()
        } else {
            requestPermission(
                this, 0,
                Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION
            )
        }

        val sManager = getSystemService(Context.SENSOR_SERVICE) as SensorManager
        val stepSensor = sManager.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR)
        sManager.registerListener(this, stepSensor, SensorManager.SENSOR_DELAY_FASTEST);
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (PermissionManager.locationPermissionsGranted(this)) {
            mGoogleApiClient = GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build()
            mGoogleApiClient?.connect()
            fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
            createLocationRequest()
        }
    }

    protected fun createLocationRequest() {
        val builder = LocationSettingsRequest.Builder()
            .addLocationRequest(locationRequest)

        val client = LocationServices.getSettingsClient(this)
        val task = client.checkLocationSettings(builder.build())

        task.addOnSuccessListener(this) {

            // All location settings are satisfied. The client can initialize
            // location requests here.
            // ...
        }

        task.addOnFailureListener(this) { e ->

            if (e is ResolvableApiException) {
                // Location settings are not satisfied, but this can be fixed
                // by showing the user a dialog.
                try {
                    // Show the dialog by calling startResolutionForResult(),
                    // and check the result in onActivityResult().
                    e.startResolutionForResult(
                        this@HomeScreen,
                        0
                    )
                } catch (sendEx: IntentSender.SendIntentException) {
                    // Ignore the error.
                }

            }
        }
    }

    fun getDistanceRun(steps: Long): Float {
        return (steps * 78).toFloat() / 100000.toFloat()
    }
}

Answer 1

我已經實現了基於gps讀數的里程表，並且通過一秒鍾的讀數，我能夠使里程表講座的准確度大大低於1％。 而且在長達50-70km的距離上，我無法檢測到與道路標記之間的距離超過50m（我什至能夠檢測到何時移動了標記）。所使用的過程涉及對速度讀數進行積分（速度由gps給出向量，因此無需計算其模數）和設備給定時間戳的精確讀數。 切勿使用位置讀數...，因為它們的質量足以使您的里程表偏離讀數的20％以上。 但是，使用速度並將其整合起來可以為您提供良好的低音帶通濾波。

使用的GPS是具有NMEA.0183輸出的標准OEM gps。 速度讀數的分辨率值為0.1，因此我並不期望精度低於1％，目前的gps器件給出的速度讀數的分辨率低於0.001。

Answer 2

您好，我不知道這是否有幫助，但是我曾經寫過一個類，通過將參數輸入到相應方法中來手動計算它：

import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Looper;
import android.support.v4.app.ActivityCompat;
import android.util.Log;
import android.widget.Toast;

import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationCallback;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationResult;
import com.google.android.gms.location.LocationServices;
import com.karumi.dexter.Dexter;
import com.karumi.dexter.MultiplePermissionsReport;
import com.karumi.dexter.PermissionToken;
import com.karumi.dexter.listener.PermissionRequest;
import com.karumi.dexter.listener.multi.MultiplePermissionsListener;

import java.util.List;

/**
 * Created by Ibkunle Adeoluwa on 1/8/2019.
 */


public class LocationManager {

    private FusedLocationProviderClient fusedLocationProviderClient;
    private LocationCallback locationCallback;
    private LocationRequest locationRequest;



    //TODO Import these Libraries in gradle
    /*
    implementation 'com.google.android.gms:play-services-location:11.8.0'
    implementation 'com.karumi:dexter:5.0.0'
    */

    private Activity myActivity;

    public LocationManager(Activity myActivity) {
        this.myActivity = myActivity;
    }


    public void requestLocationPermissions() {
        //Request required permissions using Dexter Library ACCESS_COARSE_LOCATION & ACCESS_FINE_LOCATION
        Dexter.withActivity(myActivity)
                .withPermissions(Manifest.permission.ACCESS_COARSE_LOCATION,
                        Manifest.permission.ACCESS_FINE_LOCATION)
                .withListener(new MultiplePermissionsListener() {
                    @Override
                    public void onPermissionsChecked(MultiplePermissionsReport report) {
                        if (report.areAllPermissionsGranted()) {
                            buildLocationRequest();
                            buildLocationCallback();
                            if (ActivityCompat.checkSelfPermission(myActivity, Manifest.permission.ACCESS_FINE_LOCATION)
                                    != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(myActivity, Manifest.permission.ACCESS_COARSE_LOCATION)
                                    != PackageManager.PERMISSION_GRANTED) {
                                return;
                            }
                            fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(myActivity);
                            fusedLocationProviderClient.requestLocationUpdates(locationRequest, locationCallback, Looper.myLooper());
                        }
                    }

                    @Override
                    public void onPermissionRationaleShouldBeShown(List<PermissionRequest> permissions, PermissionToken token) {
                        Toast.makeText(myActivity, "Location Permission Denied", Toast.LENGTH_SHORT).show();

                    }
                }).check();
    }


    private void buildLocationRequest() {
        //Get Location
        locationRequest = new LocationRequest();
        locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        locationRequest.setInterval(5000);
        locationRequest.setSmallestDisplacement(10.0f);
    }

    private Location buildLocationCallback() {
        //Process location response
        final Location location = new Location();

        locationCallback = new LocationCallback() {
            @Override
            public void onLocationResult(LocationResult locationResult) {
                super.onLocationResult(locationResult);
                //Log
                Log.d("Location", locationResult.getLastLocation().getLatitude()
                        + "/" + locationResult.getLastLocation().getLongitude());

                location.setLatitude(locationResult.getLastLocation().getLatitude());
                location.setLongitude(locationResult.getLastLocation().getLongitude());


            }
        };
        return location;
    }

    //TODO How to Use

    /***
     * Sample Request
     *
     System.out.println(distance(32.9697, -96.80322, 29.46786, -98.53506, 'M') + " Miles\n");
     System.out.println(distance(32.9697, -96.80322, 29.46786, -98.53506, 'K') + " Kilometers\n");
     System.out.println(distance(32.9697, -96.80322, 29.46786, -98.53506, 'N') + " Nautical Miles\n");

     System.out.println(distance(10.46786, -98.53506,32.9697, -96.80322,  'M') + " Initial Miles\n");
     System.out.println(distance(32.9697, -96.80322, 29.46786, -98.53506, 'M') + " Covered Miles\n");

     System.out.println(coveredDistance(distance(10.46786, -98.53506,32.9697, -96.80322), distance(32.9697, -96.80322, 29.46786, -98.53506))+ " Left Distance\n");

     System.out.println(percentageCoveredDistance(262.6777938054349,1558.5453389875424)+ " Covered Distance Percentage \n");
     *
     *
     ***/


    /**
     * Expected Output
     *
     262.6777938054349 Miles
     422.73893139401383 Kilometers
     228.10939614063963 Nautical Miles

     1558.5453389875424 Initial Miles
     262.6777938054349 Covered Miles

     1295.8675451821075 Left Distance
     17% Covered Distance Percentage
     *
     *
     **/


    /**
     *
     * @param lat1
     * @param lon1
     * @param lat2
     * @param lon2
     * @param unit
     * @return
     */
    private static double distance(double lat1, double lon1, double lat2, double lon2, char unit) {
        double theta = lon1 - lon2;
        double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2)) + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * Math.cos(deg2rad(theta));
        dist = Math.acos(dist);
        dist = rad2deg(dist);
        dist = dist * 60 * 1.1515;
        if (unit == 'K') {
            dist = dist * 1.609344;
        } else if (unit == 'N') {
            dist = dist * 0.8684;
        }
        return (dist);
    }

    /**
     *
     * @param lat1
     * @param lon1
     * @param lat2
     * @param lon2
     * @return
     */
    private static double distance(double lat1, double lon1, double lat2, double lon2) {
        double theta = lon1 - lon2;
        double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2)) + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * Math.cos(deg2rad(theta));
        dist = Math.acos(dist);
        dist = rad2deg(dist);
        dist = dist * 60 * 1.1515;
        return (dist);
    }

    /*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
    /*::  This function converts decimal degrees to radians             :*/
    /*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/

    /**
     *
     * @param deg
     * @return
     */
    private static double deg2rad(double deg) {
        return (deg * Math.PI / 180.0);
    }

    /*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
    /*::  This function converts radians to decimal degrees             :*/
    /*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/

    /**
     *
     * @param rad
     * @return
     */
    private static double rad2deg(double rad) {
        return (rad * 180.0 / Math.PI);
    }

    /*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
    /*::  This function converts subtracts initial from current distance:*/
    /*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/

    /**
     *
     * @param initialDistance
     * @param currentDistance
     * @return
     */
    private static double coveredDistance(double initialDistance, double currentDistance) {
        return (initialDistance - currentDistance);
    }

    /*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
    /*::This function converts the covered distance to percentage of the total :*/
    /*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/

    /**
     *
     * @param coveredDistance
     * @param totalDistance
     * @return
     */
    private static String percentageCoveredDistance(double coveredDistance, double totalDistance) {
        double percent = (100 * coveredDistance) / totalDistance;
        return String.format("%.0f%%", percent);
    }


}