Question

我正在看其他帖子，但我无法做到。我想更新我的位置，并在我＆＃34; x＆＃34;我的targetLocation的米。

我使用过这段代码：

private TextView m1TextMessage, m2TextMessage, m3TextMessage;
private LocationManager locationManager;
private Location targetLocation;
double longitude, latitude;
private float distancia;
ProgressDialog pd;
LocationListener listener;

这是我的LocationListener：

public class MyLocationListener implements LocationListener {

    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }

    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub

    }

    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub

    }

    public void onLocationChanged(Location location) {
        // TODO Auto-generated method stub
        float dist=0;
        float error=0;

        //Escribir posición actual en m1TextMessage
        latitude =location.getLatitude();
        longitude = location.getLongitude();

        //calcular distancia al destino y error estimado
        //Escribir distancia al destino y error en m3TextMessage

        Location loc2= new Location(LocationManager.GPS_PROVIDER);

         if (loc2 != null)  
            {
               dist=location.distanceTo(targetLocation);
               error = location.getAccuracy();
               if(dist < distancia){
                   Toast.makeText(getApplicationContext(), "Distancia menor a 10 metros, "+dist+" metros.",Toast.LENGTH_SHORT).show(); 
                   Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
                   Ringtone r = RingtoneManager.getRingtone(getApplicationContext(), notification);
                   r.play();
                  }
            }else
                 Toast.makeText(getApplicationContext(), "location actual es null!!",Toast.LENGTH_SHORT).show();


           m1TextMessage.setText("Posición actual: "+longitude+", "+latitude+"\n");
            m2TextMessage.setText("Posición objetivo: "+targetLocation.getLatitude()+", "+targetLocation.getLongitude()+"\n");
            m3TextMessage.setText("Distancia al objetivo: "+dist+"\nError estimado: "+error);
        //Lanzar un Toast si la distancia al destino es inferior a 10 metros

    }

};

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

    setContentView(R.layout.activity_main);

    m1TextMessage=(TextView) findViewById(R.id.actualPos);
    m2TextMessage=(TextView) findViewById(R.id.destino);
    m3TextMessage=(TextView) findViewById(R.id.distanciaa);
    Button localiza = (Button)findViewById(R.id.button1);

    locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
    localiza.setOnClickListener(this);


}

public class GPSLocation extends AsyncTask<Void, Void, Void>
{  
    boolean running =true;
            @Override
            protected void onPreExecute()
            {  
                super.onPreExecute(); 
                pd = new ProgressDialog(PracticaGPS.this);
                pd.setOnCancelListener(new DialogInterface.OnCancelListener(){
                      public void onCancel(DialogInterface dialog) {
                          pd.cancel();  
                      }
                });
                longitude=0;
                latitude =0;
                getLonLat();
                pd.setCancelable(true);
                pd.setMessage("Getting GPS Location...");
                pd.setProgressStyle(ProgressDialog.STYLE_SPINNER);

                pd.show();

            } 

            @Override 
            protected void onProgressUpdate(Void... values) {
                super.onProgressUpdate(values);


                // Things to be done while execution of long running operation is in progress. For example updating ProgessDialog
             }

            @Override 
            protected void onPostExecute(Void result)
            {  


                    pd.dismiss(); 
            }

            @Override
            protected Void doInBackground(Void... params) {  
                boolean isDataSubmitted = false;

                while(!isDataSubmitted)
                {  
                    if(longitude !=0 && latitude!=0)
                    { 

                        isDataSubmitted = true;
                        Log.d("LONGITUD", ""+longitude);
                        Log.d("LATITUDE", ""+latitude);

                    }  
                } 

                return null;    
            } 
 } 


public void getLonLat(){
    listener = new MyLocationListener();

    if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
        (locationManager).requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 10,listener);
         new GPSLocation().execute();
    }else if (locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 5000, 10, listener);
        Log.d("Long", ""+longitude);
    } else 
        enableLocationSettings();

}

@Override
public void onStart(){

    //Crear servicio de localización LocationManager       
    //Determinar si el GPS está encendido
    //Caso esté apagado, permitir al usuario activarlo mediante método enableLocationSettings()

    //Solicitar actualizaciones de posición al proveedor de GPS (opcionalmente también al proveedor de red)
    //Nota: el LocationListener ya ha sido creado: listener


    super.onStart();
}


private void enableLocationSettings() { //enable Location services is necessary
    Intent settingsIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
    startActivity(settingsIntent);
}


@Override
public void onStop(){
     locationManager.removeUpdates(listener);
     super.onStop();
}

public void onClick(View v) {
        EditText lat, lon, distan;
        lat = (EditText)findViewById(R.id.latitud);
        lon = (EditText)findViewById(R.id.longitud);
        targetLocation = new Location("Target Position");
        targetLocation.setLatitude(Double.valueOf(lat.getText().toString())); //punto pre-definido,
        targetLocation.setLongitude(Double.valueOf(lon.getText().toString())); //no cambiar el valor
        targetLocation.setAltitude(0);
        distan = (EditText)findViewById(R.id.distancia);
        distancia = Float.valueOf(distan.getText().toString());
        new GPSLocation().execute();

}

}

这是我的xml代码：

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Longitud: " />

    <EditText
        android:id="@+id/longitud"
        android:layout_width="101dp"
        android:layout_height="wrap_content"
        android:ems="10" />

    <TextView
        android:id="@+id/texto2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Latitud: " />

    <EditText
        android:id="@+id/latitud"
        android:layout_width="105dp"
        android:layout_height="wrap_content"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Distancia mínima alarma" />

    <EditText
        android:id="@+id/distancia"
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:ems="10" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Enviar Localizacion" />

    <TextView
        android:id="@+id/actualPos"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"

        />

    <TextView
        android:id="@+id/destino"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"

         />
    <TextView
        android:id="@+id/distanciaa"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"

         />

我觉得很简单，但我可以管理它。谢谢。

Answer 1

阅读本文。

http://developer.android.com/reference/android/location/Location.html

使用此功能

public static void distanceBetween (double startLatitude, double startLongitude, double endLatitude, double endLongitude, float[] results)

从函数中获取结果，并在循环中将目标位置减去它。

Answer 2

如果您希望获得从当前位置到目标位置的距离，则可以正确调用此方法..这将根据Google服务提供距离.. simpley它会返回值...它会很好地工作。希望它会对你有所帮助。

package com.google.map;
import java.io.IOException;
import java.io.InputStream;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class Distance   {

public String getDistance(String Source,String Destination) {
    StringBuilder stringBuilder = new StringBuilder();
    String duration_final_value = "";
    try {

        Source = Source.replaceAll(" ", "%20");
        Destination = Destination.replaceAll(" ", "%20");

        HttpPost httppost = new HttpPost(
                "http://maps.google.com/maps/api/directions/json?origin="
                        + Source + "&destination=" + Destination
                        + "&sensor=false&units=metric&mode=driving");//&mode=walking,driving
        HttpClient client = new DefaultHttpClient();
        HttpResponse response;
        stringBuilder = new StringBuilder();

        response = client.execute(httppost);
        HttpEntity entity = response.getEntity();
        InputStream stream = entity.getContent();
        int b;
        while ((b = stream.read()) != -1) {
            stringBuilder.append((char) b);
        }
    } catch (ClientProtocolException e) {
    } catch (IOException e) {
    }

    JSONObject jsonObject = new JSONObject();
    try {
        jsonObject = new JSONObject(stringBuilder.toString()); // first we need to get the full json object which google returns    
        JSONArray routes_Array = jsonObject.getJSONArray("routes"); // in that first we need to go into the routes array
        JSONObject routes_object = (JSONObject) routes_Array.get(0); // in that we need first item 
        JSONArray legs_Array = routes_object.getJSONArray("legs");  // then go into the legs array
        JSONObject legs_object = (JSONObject) legs_Array.get(0);  // in that we need first item.
        JSONObject duration_object = legs_object.getJSONObject("distance"); // go into the distance object      
        // pull out the "duration" object
        duration_final_value = duration_object.getString("text"); // this should be the duration text value (20 hours 40 mins)



    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return duration_final_value;
}
}

更新android Gps LocationListener中的当前位置

2 个答案: