Berechnung der Entfernung zwischen Benutzerstandort und Restaurantstandort via json (url)

Question

Ich habe latitude & longitude die von einer URL (JSON) kommen. Ich muss die Entfernung vom Standort des Benutzers (muss zuerst bestimmt werden) zu einer bestimmten latitude & longitude Basis (die von einer URL kommt) berechnen und die Entfernung zwischen diesen anzeigen.

zum Abrufen von Daten für JSON (Breite & Länge von Restaurant)

URL::

JSON Daten können auf dem angehängten Bild gesehen werden https://comida-95724.herokuapp.com/api/v1/restaurants/get_featured_restaurants

ListActiivty.java

public class ListViewActivity extends Activity { 
    // Log tag 
    private static final String TAG = ListViewActivity.class.getSimpleName(); 
    // change here url of server api 
    private static final String url = "https://comida-95724.herokuapp.com/api/v1/restaurants/get_featured_restaurants"; 

    private ProgressDialog pDialog; 
    private List<Movie> movieList = new ArrayList<Movie>(); 
    private ListView listView; 

    private CustomListAdapter adapter; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_listview); 
     listView = (ListView) findViewById(R.id.list); 
     adapter = new CustomListAdapter(this, movieList); 

     listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
       Movie movie = movieList.get(position); 
       Intent intent = new Intent(ListViewActivity.this, SecondActivity.class); 
       intent.putExtra("name", movie.getName()); 
       intent.putExtra("average_ratings", movie.getAverage_ratings()); 
       intent.putExtra("full_address", movie.getAddress()); 
       intent.putExtra("image_url", movie.getThumbnailUrl()); 
       intent.putExtra("cuisine",movie.getCuisine()); 
       intent.putExtra("cost",movie.getCost()); 
       startActivity(intent); 

      } 
     }); 
     listView.setAdapter(adapter); 
     pDialog = new ProgressDialog(this); 
     // Showing progress dialog before making http request 
     pDialog.setMessage("Please Keep patience.Its loading..."); 

     pDialog.show(); 

     JsonArrayRequest movieReq = new JsonArrayRequest(url, 
       new Response.Listener<JSONArray>() { 
        @Override 
        public void onResponse(JSONArray response) { 
         Log.d(TAG, response.toString()); 
         hidePDialog(); 
         // Parsing json 
         for (int i = 0; i < response.length(); i++) { 
          try { 
           JSONObject obj = response.getJSONObject(i); 
           Movie movie = new Movie(); 
           //movie.setTitle(obj.getString("title")); 
           movie.setName(obj.getString("name")); 
           //movie.setThumbnailUrl(obj.getString("image")); 
           movie.setThumbnailUrl(obj.getString("org_image_url")); 
           movie.setAverage_ratings(obj.getString("average_ratings")); 
           movie.setCuisine(obj.getString("cuisine")); 
           movie.setAddress(obj.getJSONObject("address").getString("area")); 
           movie.setlatitude(obj.getJSONObject("address").getString("latitude")); 
           movie.setlongitude(obj.getJSONObject("address").getString("longitude")); 
           movieList.add(movie); 
          } catch (JSONException e) { 
           e.printStackTrace(); 
          } 
         } 
         adapter.notifyDataSetChanged(); 
        } 
       }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       VolleyLog.d(TAG, "Error: " + error.getMessage()); 
       hidePDialog(); 

      } 
     }); 

     // Adding request to request queue 
     AppController.getInstance().addToRequestQueue(movieReq); 
    } 

    @Override 
    public void onDestroy() { 
     super.onDestroy(); 
     hidePDialog(); 
    } 

    private void hidePDialog() { 
     if (pDialog != null) { 
      pDialog.dismiss(); 
      pDialog = null; 
     } 
    } 

} 

list_row.xml

<?xml version="1.0" encoding="utf-8"?> 
    <android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:app="http://schemas.android.com/apk/res-auto" 
     xmlns:tools="http://schemas.android.com/tools" 
     android:id="@+id/ly_root" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_margin="12dp" 
     android:background="#FEFEFE" 
     app:cardCornerRadius="8dp"> 
     <RelativeLayout 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content"> 
      <com.android.volley.toolbox.NetworkImageView 
       android:id="@+id/thumbnail" 
       android:layout_width="120dp" 
       android:layout_height="100dp" 
       android:layout_marginRight="8dp" 
       android:scaleType="centerCrop" /> 

      <!-- Restaurant name --> 
      <TextView 
       android:id="@+id/name" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 

       android:layout_toRightOf="@+id/thumbnail" 
       android:textStyle="bold" /> 

      <TextView 
       android:id="@+id/area" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:layout_below="@id/name" 
       android:layout_toRightOf="@+id/thumbnail" 
       android:textColor="#D2691E"/> 

      <!-- Rating --> 
      <TextView 
       android:id="@+id/average_ratings" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:layout_below="@id/area" 
       android:layout_toRightOf="@+id/thumbnail" 
       android:textColor="#D2691E" /> 

      <TextView 
       android:id="@+id/cuisine" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:layout_below="@id/average_ratings" 
       android:layout_toRightOf="@+id/thumbnail" 
       android:textColor="#D2691E" /> 
      <TextView 
       android:id="@+id/cost" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:layout_below="@id/cuisine" 
       android:layout_toRightOf="@+id/thumbnail" 
       android:textColor="#D2691E" /> 
    <TextView 
      android:id="@+id/latitude" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:layout_below="@id/cost" 
      android:layout_toRightOf="@+id/thumbnail" 
      android:textColor="#D2691E" /> 
     <TextView 
      android:id="@+id/longitude" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:layout_below="@id/latitude" 
      android:layout_toRightOf="@+id/thumbnail" 
      android:textColor="#D2691E" /> 
      <TextView 
       android:id="@+id/Distance" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:layout_below="@id/cost" 
       android:layout_toRightOf="@+id/thumbnail" 
       android:textColor="#D2691E" /> 
     </RelativeLayout> 

    </android.support.v7.widget.CardView> 

Ich erhalte die Ergebnisse nun wie Bild unten. Dabei habe ich den Abstand zwischen dem Benutzer zeigen, und dem besonderen Restaurant:

Beispiel: Die Entfernung von Benutzer von Yuuka -Der St. Regis Mumbai = 1,9 km entfernt

Wie kann ich das zeigen?

Könnte mir bitte jemand helfen?

Answer 1

Wenn Sie Ihren aktuellen Standort kennen, können Sie Abstand zwischen zwei Location Objekte in Android wie folgt berechnen:

Location myLocation = new Location("my loc"); 

myLocation.setLatitude(myLat); 
myLocation.setLongitude(myLng); 

Location locFromJson = new Location("loc from json"); 

locFromJson.setLatitude(latFromJson); 
locFromJson.setLongitude(lngFromJson); 

float distance = myLocation.distanceTo(locFromJson); 

Hier distance in Meter. Daher wird distance/1000 in Kilometern angegeben.