如何自动找到当前的经纬度值？

Posted 2023-04-19

【中文标题】如何自动找到当前的经纬度值？

【英文标题】：How to find the current longitude and latitude value automatically?

【发布时间】：2014-03-03 08:43:29

【问题描述】：

我正在尝试制作一款可以提供最近的医院名称和地址的应用程序。我正在使用 Json 解析。这是我的代码..

我正在使用这个 url = "https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=17.4367624,78.439968799&radius=5000&types=hospital&sensor=true&key=AIzaSyAwBKDflSlg9d38GX1xrwpnwcbWCzdVj-A"

我这个 longi 和 lati 值是手动给出的，但我希望无论用户去哪里，它都应该根据当前位置采用相应的 lat & long 值。请帮助我如何解决这个问题......任何帮助都会很明显......谢谢......

public class MainActivity extends Activity 

    JSONArray jsonArray;

    @TargetApi(Build.VERSION_CODES.GINGERBREAD)
    @SuppressLint("NewApi")
    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);

        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
                .permitAll().build();
        StrictMode.setThreadPolicy(policy);

        setContentView(R.layout.activity_main);

        HttpClient client = new DefaultHttpClient();
        HttpPost post = new HttpPost(
                "https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=17.4367624,78.439968799&radius=5000&types=hospital&sensor=true&key=AIzaSyAwBKDflSlg9d38GX1xrwpnwcbWCzdVj-A");
        north=44.1&south=-9.9&east=-22.4&west=55.2&lang=de&username=demo");

        try 
            HttpResponse response = client.execute(post);

            String jsonResult = inputStreamToString(
                    response.getEntity().getContent()).toString();

            jsonArray = new JSONArray(jsonResult);

         catch (ClientProtocolException e) 
            // TODO Auto-generated catch block
            e.printStackTrace();
         catch (IOException e) 
            // TODO Auto-generated catch block
            e.printStackTrace();
         catch (JSONException e) 
            // TODO Auto-generated catch block
            e.printStackTrace();
        

        ListView list = (ListView) findViewById(R.id.listView1);

        List_Adapter la = new List_Adapter();
        list.setAdapter(la);
    

    class List_Adapter extends BaseAdapter 

        @Override
        public int getCount() 
            // TODO Auto-generated method stub
            return jsonArray.length();
        

        @Override
        public Object getItem(int arg0) 
            // TODO Auto-generated method stub
            return null;
        

        @Override
        public long getItemId(int arg0) 
            // TODO Auto-generated method stub
            return 0;
        

        @Override
        public View getView(int index, View v, ViewGroup arg2) 
            // TODO Auto-generated method stub

            v = getLayoutInflater().inflate(R.layout.custom, null);
            TextView tv = (TextView) v.findViewById(R.id.textView1);

            try 
                tv.append("id : "
                        + jsonArray.getJSONObject(index).getString("id")
                                .toString() + "\n");
                tv.append("level: "
                        + jsonArray.getJSONObject(index).getString("level")
                                .toString() + "\n");
                tv.append("time_in_secs: "
                        + jsonArray.getJSONObject(index)
                                .getString("time_in_secs").toString() + "\n");
                tv.append("par: "
                        + jsonArray.getJSONObject(index).getString("par")
                                .toString() + "\n");
                tv.append("initials: "
                        + jsonArray.getJSONObject(index).getString("initials")
                                .toString() + "\n");
                tv.append("quote: "
                        + jsonArray.getJSONObject(index).getString("quote")
                                .toString() + "\n");
                tv.append("time_stamp: "
                        + jsonArray.getJSONObject(index)
                                .getString("time_stamp").toString() + "\n");
             catch (JSONException e) 
                // TODO Auto-generated catch block
                e.printStackTrace();
            

            return v;
        

    

    private StringBuilder inputStreamToString(InputStream is) 
        // TODO Auto-generated method stub

        String rLine = "";
        StringBuilder sb = new StringBuilder();

        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr);

        try 
            while ((rLine = br.readLine()) != null) 

                sb.append(rLine);
            

         catch (IOException e) 
            // TODO Auto-generated catch block
            e.printStackTrace();
        

        return sb;
    

【问题讨论】：

试试下面的链接：***.com/questions/2227292/… 尽管它的目的不同，你只是想得到电话的经度和纬度。该链接是第一个谷歌点击，看起来很可靠。

【参考方案1】：

看看这个指南：

https://developer.android.com/training/location/index.html

如果您关注它，您将收到位置更新并可以将其放入请求字符串中。

【参考方案2】：

试试这个以获得当前位置的详细信息以获取更多详细信息关注android developer site。那里有关于位置感知的完整文档。

首先在清单中指定应用权限以访问当前位置

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

检索当前位置的代码

LocationManager locationManager;
double current_latitude,current_longitude;
String location_context;
Location location;
double[] find_Location() 

    location_context = Context.LOCATION_SERVICE;
    locationManager = (LocationManager)activity.getSystemService(location_context);
    List<String> providers = locationManager.getProviders(true);
    for (String provider : providers) 
        locationManager.requestLocationUpdates(provider, 1000, 0,
            new LocationListener() 

                public void onLocationChanged(Location location) 

                public void onProviderDisabled(String provider) 

                    Toast.makeText(activity.getApplicationContext(), "Gps Disabled", Toast.LENGTH_SHORT ).show(); 
                

                public void onProviderEnabled(String provider) 

                    Toast.makeText(activity.getApplicationContext(), "Gps Enabled", Toast.LENGTH_SHORT).show();
                

                public void onStatusChanged(String provider, int status,
                        Bundle extras) 
            );
        location = locationManager.getLastKnownLocation(provider);
        if (location != null) 
            current_latitude = location.getLatitude();
            current_longitude = location.getLongitude();

        
    
    return new double[]current_latitude,current_longitude;