我需要计算汽车的行驶距离！没有距离，没有距离。如果我们通过Google提供的API计算距离，则距离可以完全不同。 Google可以从一个点到另一点提供1公里，但汽车可以按照骑手想要的方式行驶800米。使用加速度计没有帮助。它适用于步行，但永远不会加快速度。
关于如何获得汽车行驶距离的任何建议？
我尝试使用Google的Location API：distanceTo或distanceBetween根本不是一个选项。与IN REAL相比，它可以提供明显不同的结果。在真正的汽车中，它可以穿越非常短的地方并在800米内达到目标，而Google可以在两个位置之间提供1公里的距离。
下面是我的应用程序的代码。速度非常正确。
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()
}
}
答案 0 :(得分：1)
我已经实现了基于gps读数的里程表，并且通过一秒钟的读数，我能够使里程表讲座的准确度大大低于1％。而且在长达50-70km的距离上，我无法检测到与道路标记之间的距离超过50m（我什至能够检测到何时移动了标记）。所使用的过程涉及对速度读数进行积分（速度由gps给出向量，因此无需计算其模数）和设备给定时间戳的精确读数。切勿使用位置读数...，因为它们的质量足以使您的里程表偏离读数的20％以上。但是，使用这些速度并将其整合起来可以为您提供良好的低音带通滤波。
使用的GPS是具有NMEA.0183输出的标准OEM GPS。速度读数的分辨率值为0.1，因此我不希望精度低于1％，目前的gps设备提供的速度读数的分辨率低于0.001。
答案 1 :(得分：0)
你好，我不知道这是否有帮助，但是我曾经写过一个类，通过将参数输入到各个方法中来手动计算它：
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);
}
}