Question

Location.java

package com.localisation;

import java.io.IOException;
import java.util.List;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.View.OnClickListener;
import android.widget.TextView;
import android.widget.Toast;

public class localisation extends Activity implements OnClickListener, LocationListener{
    private LocationManager lManager;
    private Location location;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //On spécifie que l'on va avoir besoin de gérer l'affichage du cercle de chargement
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.main);

        //On récupère le service de localisation
        lManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);


        //On affecte un écouteur d'évènement aux boutons
        findViewById(R.id.obtenir_position).setOnClickListener(this);

    }

        //Méthode déclencher au clique sur un bouton
    public void onClick(View v) {
            obtenirPosition();
        }
    }

    private void afficherLocation() {
        //On affiche les informations de la position a l'écran
        ((TextView)findViewById(R.id.latitude)).setText(String.valueOf(location.getLatitude()));
        ((TextView)findViewById(R.id.longitude)).setText(String.valueOf(location.getLongitude()));
        ((TextView)findViewById(R.id.altitude)).setText(String.valueOf(location.getAltitude()));
    }

    public void onProviderDisabled(String provider) {
        //Lorsque la source (GSP ou réseau GSM) est désactivé
        Log.i("Tuto géolocalisation", "La source a été désactivé");
        //...on affiche un Toast pour le signaler à l'utilisateur
        Toast.makeText(localisation.this,
                String.format("La source \"%s\" a été désactivé", provider),
                Toast.LENGTH_SHORT).show();
        //... et on spécifie au service que l'on ne souhaite plus avoir de mise à jour
        lManager.removeUpdates(this);
        //... on stop le cercle de chargement
        setProgressBarIndeterminateVisibility(false);
    }

    public void onProviderEnabled(String provider) {
        Log.i("Tuto géolocalisation", "La source a été activé.");
    }
    public void onStatusChanged(String provider, int status, Bundle extras) {
        Log.i("Tuto géolocalisation", "Le statut de la source a changé.");
    }

}

Main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:id="@+id/RelativeLayout01"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <TextView android:text="Latitude" 
        android:id="@+id/TextView01"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:gravity="center" 
        android:layout_marginLeft="10dip" />

    <EditText android:text="0.0" 
        android:id="@+id/latitude"
        android:layout_height="wrap_content" 
        android:layout_alignParentRight="true"
        android:editable="false"
        android:focusable="false"
        android:gravity="center" 
        android:layout_marginRight="10dip"
        android:layout_width="150dip" />

    <TextView android:text="Longitude" 
        android:id="@+id/TextView02"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/longitude" 
        android:layout_alignTop="@+id/longitude"
        android:gravity="center" 
        android:layout_marginLeft="10dip" />

    <EditText android:text="0.0" 
        android:id="@+id/longitude"
        android:layout_height="wrap_content" 
        android:layout_alignParentRight="true"
        android:editable="false"
        android:focusable="false"
        android:gravity="center" 
        android:layout_marginRight="10dip"
        android:layout_width="150dip" 
        android:layout_below="@+id/latitude" />

    <TextView android:text="Altitude" 
        android:id="@+id/TextView03"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/altitude" 
        android:layout_alignTop="@+id/altitude"
        android:gravity="center" 
        android:layout_marginLeft="10dip" />

    <EditText android:text="altitude" 
        android:id="@+id/altitude"
        android:layout_height="wrap_content" 
        android:layout_alignParentRight="true"
        android:editable="false"
        android:focusable="false"
        android:gravity="center" 
        android:layout_marginRight="10dip"
        android:layout_below="@+id/TextView02" 
        android:layout_width="150dip" />

    <LinearLayout android:id="@+id/LinearLayout01"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:layout_below="@id/TextView03" 
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dip">


        <Button android:layout_height="wrap_content" 
            android:id="@+id/obtenir_position"
            android:text="Obtenir Position" 
            android:layout_width="100dip" />

    </LinearLayout>
</RelativeLayout>

Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.localisation"
      android:versionCode="1"
      android:versionName="1.0">


    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".localisation"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
    </application>
</manifest>

i have a problem in those codes. My goal is determine my position (longitude, latitude and altitude.

In a database i have some places defined by (longitude, latitude and altitude and i want to determine the most near place. (with google Map API (without displaying the map)

Can you help me please and explain me in details what i do now?

Thank you very much

Answer 1

I am using this code to get the Latitude and longitude of current location:

LocationManager locManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,1000L,500.0f, locationListener);
Location location = locManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

double latitude=0;
double longitude=0;
latitude = location.getLatitude();
longitude = location.getLongitude();