0
I’m building an app that by going through a "line", defined by an interval of latitudes and longitudes, recognizes the passage and displays it in a View.
But I noticed that when passing through the gap at a higher speed, on board a vehicle, it does not recognize the passage.
How can I get this accuracy at a higher speed?
package br.com.nobre.ntrack.activity;
import android.Manifest;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.TextView;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import br.com.nobre.ntrack.R;
import br.com.nobre.ntrack.config.Permissoes;
public class NavegacaoActivity extends AppCompatActivity {
private GoogleMap mMap;
private String[] permissoes = new String[]{Manifest.permission.ACCESS_FINE_LOCATION};
private LocationListener locationListener;
private LocationManager locationManager;
private TextView txtLat, txtLong, txtVelocidade, txtParcial;
private Double testeMaior;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.teste_navegacao);
Permissoes.validarPermissoes(permissoes, this, 1);
txtLat = findViewById(R.id.txtLatitude);
txtLong = findViewById(R.id.txtLongitude);
txtVelocidade = findViewById(R.id.txtVelocidade);
txtParcial = findViewById(R.id.txtParcial);
Double lat1, lat2;
lat1 = -29.909756; // maior
lat2 = -29.909811;
Log.i("teste", "maior = " + testeMaior);
txtParcial.setText("Não passou");
locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
Log.i("teste de localizacao", "Localizacao: " + location.toString());
Double latitude = location.getLatitude();
Double longitude = location.getLongitude();
float velocidade = location.getSpeed();
txtLat.setText("lat: " + latitude);
txtLong.setText("long: " + longitude);
double velocidadeEmKm = (velocidade * 3.6);
txtVelocidade.setText("velocidade: " + velocidadeEmKm);
//-29.909737, -51.142835
//-29.909846, -51.142851
if (latitude >= -29.909846 && latitude <= -29.909737) {
if (longitude >= -51.142851 && longitude <= -51.142835) {
// esta passando na parcial teste efetuado com sucesso
txtParcial.setText("Passou pela parcial");
}
}
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
};
// recuperar localização do usuario
/*
* 1 - provedor de localização
* 2 - Tempo mínimo entre atualizações de localização (milesegundos)
* 3 - Distância mínima entre atualizações de localização (metros)
* Location Listner ( Para recebermos as atualizações)*/
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
for (int permissaoResultado : grantResults) {
if (permissaoResultado == PackageManager.PERMISSION_DENIED) {
//Alerta
alertaValidacaoPermissao();
} else if (permissaoResultado == PackageManager.PERMISSION_GRANTED) {
// recuperar localização do usuario
/*
* 1 - provedor de localização
* 2 - Tempo mínimo entre atualizações de localização (milesegundos)
* 3 - Distância mínima entre atualizações de localização (metros)
* Location Listner ( Para recebermos as atualizações)*/
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}
}
}
}
private void alertaValidacaoPermissao() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(getResources().getString(R.string.permissoes_negadas));
builder.setMessage(getResources().getString(R.string.mensagem_permissoes_negadas));
builder.setCancelable(false);
builder.setPositiveButton(getResources().getString(R.string.confirmar_permissoes_negadas), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
finish();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}
@Override
protected void onStop() {
super.onStop();
locationManager.removeUpdates(locationListener);
}
}
I don’t know how long this interval is that you mentioned and I also don’t know how long your application reads the coordinate. But let’s say that it’s 100 meters wide and for as long as you’ve been between the coordinates the system hasn’t read or if the only reading it’s made has dropped out of that range it won’t recognize.
– Reginaldo Rigo
When you are driving with Waze and out on a parallel track, it takes a long time to 'realize' that you have left the main road.
– Reginaldo Rigo
Another important detail Waze ( for example ) achieves a good level of accuracy because it uses another map to correct the points it receives from GPS. If you do not make any correction the points can be well spread, and it is natural that.
– Reginaldo Rigo