我有来自 URL (JSON) 的 latitude
和 longitude
。我必须计算从用户位置(需要首先确定)到特定 latitude
& longitude
基础(来自 URL)的距离并显示距离在这些之间。
JSON 数据可以在附图中看到:
用于获取(餐厅的纬度和经度)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>
我现在得到的结果如下图所示。在此我必须显示用户与特定餐厅之间的距离:
示例:用户距离 Yuuka -The St. Regis Mumbai =1.9 公里远
我怎样才能显示这个?
谁能帮帮我?
最佳答案
如果你知道你当前的位置,你可以在 Android 中计算两个 Location
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);
此处,距离
以米为单位。因此,distance/1000
将以千米为单位。
关于android - 通过 json (url) 计算用户位置和餐厅位置之间的距离,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38991426/