我想问你有没有可能的方法来计算两个位置之间的速度例如，如果用户在位置A，然后移动到位置B，如何知道用户在这两点之间的速度?此外，我能否确定用户是在走路、坐车还是坐火车……等等?
- 读取当前位置每30秒或任何间隔你喜欢。
- 获取两个位置之间的差异，并使用以下命令转换为英里:
- 通过除以你的时间间隔得到这段时间内的速度
通过速度值，您也许可以确定速度是步行(最慢)，汽车还是火车(最快)。
如果你的应用程序正在运行，你可以记录GPS传感器的数据来检查速度。或者只是计算用户从A点到b点所需的时间。
全程平均速度为
average speed = distance between A and B / time needed to move from A to B
http://www.firstdroid.com/2010/04/29/android-development-using-gps-to-get-current-location-2/
获取用户的速度，使用这行代码:
speed = loc.getSpeed();
我将解释如何通过使用Android位置管理器在Android设备中使用GPS获得当前用户的速度。获取当前速度对用户来说有多种用途。
GPSManager.java
public class GPSManager implements android.location.GpsStatus.Listener{
private static final int gpsMinTime = 500;
private static final int gpsMinDistance = 0;
private static LocationManager locationManager = null;
private static LocationListener locationListener = null;
private static GPSCallback gpsCallback = null;
Context mcontext;
public GPSManager(Context context) {
mcontext=context;
GPSManager.locationListener = new LocationListener() {
@Override
public void onLocationChanged(final Location location) {
if (GPSManager.gpsCallback != null) {
GPSManager.gpsCallback.onGPSUpdate(location);
}
}
@Override
public void onProviderDisabled(final String provider) {
}
@Override
public void onProviderEnabled(final String provider) {
}
@Override
public void onStatusChanged(final String provider, final int status, final Bundle extras) {
}
};
}
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mcontext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mcontext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
public GPSCallback getGPSCallback()
{
return GPSManager.gpsCallback;
}
public void setGPSCallback(final GPSCallback gpsCallback) {
GPSManager.gpsCallback = gpsCallback;
}
public void startListening(final Context context) {
if (GPSManager.locationManager == null) {
GPSManager.locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
}
final Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setSpeedRequired(true);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
final String bestProvider = GPSManager.locationManager.getBestProvider(criteria, true);
if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions((Activity) context, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, 101);
}
if (bestProvider != null && bestProvider.length() > 0) {
GPSManager.locationManager.requestLocationUpdates(bestProvider, GPSManager.gpsMinTime,
GPSManager.gpsMinDistance, GPSManager.locationListener);
}
else {
final List<String> providers = GPSManager.locationManager.getProviders(true);
for (final String provider : providers)
{
GPSManager.locationManager.requestLocationUpdates(provider, GPSManager.gpsMinTime,
GPSManager.gpsMinDistance, GPSManager.locationListener);
}
}
}
public void stopListening() {
try
{
if (GPSManager.locationManager != null && GPSManager.locationListener != null) {
GPSManager.locationManager.removeUpdates(GPSManager.locationListener);
}
GPSManager.locationManager = null;
}
catch (final Exception ex) {
ex.printStackTrace();
}
}
public void onGpsStatusChanged(int event) {
int Satellites = 0;
int SatellitesInFix = 0;
if (ActivityCompat.checkSelfPermission(mcontext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(mcontext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions((Activity) mcontext, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, 101);
}
int timetofix = locationManager.getGpsStatus(null).getTimeToFirstFix();
Log.i("GPs", "Time to first fix = "+String.valueOf(timetofix));
for (GpsSatellite sat : locationManager.getGpsStatus(null).getSatellites()) {
if(sat.usedInFix()) {
SatellitesInFix++;
}
Satellites++;
}
Log.i("GPS", String.valueOf(Satellites) + " Used In Last Fix ("+SatellitesInFix+")");
}
}
GPSCallback.java
public interface GPSCallback{
public abstract void onGPSUpdate(Location location);
}