I have latitude & longitude which are coming from a URL (JSON). I have to calculate the distance from the users location (needs to be determined first) to a particular latitude & longitude basis (which is coming from a URL) and show the distance between those.
我有来自URL(JSON)的纬度和经度。我必须计算从用户位置(需要首先确定)到特定纬度和经度(来自URL)的距离并显示它们之间的距离。
The JSON data can be seen on the attached image:
可以在附加图像上看到JSON数据:
URL for fetching JSON data for (latitude & longitude of restaurant): https://comida-95724.herokuapp.com/api/v1/restaurants/get_featured_restaurants
获取(餐馆的纬度和经度)的JSON数据的URL: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>
I am getting the results now like below image. In this i have to show the distance between the user and the particular restaurant:
我现在得到的结果如下图所示。在这里我必须显示用户和特定餐厅之间的距离:
Example: Distance of user from Yuuka -The St. Regis Mumbai =1.9 km away
示例:Yuuka - The St. Regis Mumbai的用户距离= 1.9 km
How can I show this?
我该如何展示?
Could anyone please help me?
有人可以帮帮我吗?
1 个解决方案
#1
2
If you know your current location, you can calculate distance between two Location objects in Android as follow:
如果您知道当前位置,则可以计算Android中两个位置对象之间的距离,如下所示:
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);
Here, distance is in meters. Therefore, distance/1000 will be in kilometers.
这里,距离以米为单位。因此,距离/ 1000将以千米为单位。
#1
2
If you know your current location, you can calculate distance between two Location objects in Android as follow:
如果您知道当前位置,则可以计算Android中两个位置对象之间的距离,如下所示:
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);
Here, distance is in meters. Therefore, distance/1000 will be in kilometers.
这里,距离以米为单位。因此,距离/ 1000将以千米为单位。