Android在按钮点击中获取位置

Posted 2023-04-14

【中文标题】Android在按钮点击中获取位置

【英文标题】：Android get Location in Button click

【发布时间】：2017-08-10 23:05:15

【问题描述】：

我尝试在按钮单击中获取位置。我写了LocationListener 方法，一切正常。这是我的来源

private class MyLocationListener implements LocationListener 

    @Override
    public void onLocationChanged(Location loc) 
        editLocation.setText("");
        pb.setVisibility(View.INVISIBLE);
        Toast.makeText(
                getBaseContext(),
                "Location changed: Lat: " + loc.getLatitude() + " Lng: "
                    + loc.getLongitude(), Toast.LENGTH_SHORT).show();
        String longitude = "Longitude: " + loc.getLongitude();
        Log.v(TAG, longitude);
        String latitude = "Latitude: " + loc.getLatitude();
        Log.v(TAG, latitude);

        /*------- To get city name from coordinates -------- */
        String cityName = null;
        Geocoder gcd = new Geocoder(getBaseContext(), Locale.getDefault());
        List<Address> addresses;
        try 
            addresses = gcd.getFromLocation(loc.getLatitude(),
                    loc.getLongitude(), 1);
            if (addresses.size() > 0) 
                System.out.println(addresses.get(0).getLocality());
                cityName = addresses.get(0).getLocality();
            
        
        catch (IOException e) 
            e.printStackTrace();
        
        String s = longitude + "\n" + latitude + "\n\nMy Current City is: "
            + cityName;
        editLocation.setText(s);
    

    @Override
    public void onProviderDisabled(String provider) 

    @Override
    public void onProviderEnabled(String provider) 

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) 

我可以使用LocationListener 检查纬度和经度，但是如何在按钮单击中获取当前位置？

【问题讨论】：

您可以将纬度和经度设为全局 ....因此您可以在任何其他功能中使用它...

怎么样？ @rafsanahmad007

最好的方法是使用回调，在获取位置时通知您；有时，您不能只期望在需要时得到它——比如从快餐店订购

【参考方案1】：

你从LocationManager::getLastKnownLocation()得到它

LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

【参考方案2】：

这是我的代码，它适用于我的应用程序。您可以尝试获取位置。

 ro_gps_icon.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View v) 

            LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
            if (ActivityCompat.checkSelfPermission(RODetailsActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(RODetailsActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
                return;
                       locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 30000, 0, (LocationListener) RODetailsActivity.this);
            Criteria criteria = new Criteria();
            String bestProvider = locationManager.getBestProvider(criteria, true);
            Location location = locationManager.getLastKnownLocation(bestProvider);

            if (location == null) 
                Toast.makeText(getApplicationContext(), "GPS signal not found", Toast.LENGTH_SHORT).show();
            
            if (location != null) 
                Log.e("locatin", "location--" + location);

                Log.e("latitude at beginning",
                        "@@@@@@@@@@@@@@@" + location.getLatitude());
                onLocationChanged(location);
            
        
    );

以及获取数据的方法。

public void onLocationChanged(Location location) 
    Geocoder geocoder;
    List<Address> addresses;
    geocoder = new Geocoder(this, Locale.getDefault());

    double latitude = location.getLatitude();
    double longitude = location.getLongitude();

    Log.e("latitude", "latitude--" + latitude);
    try 
        Log.e("latitude", "inside latitude--" + latitude);
        addresses = geocoder.getFromLocation(latitude, longitude, 1);
        if (addresses != null && addresses.size() > 0) 
            String address = addresses.get(0).getAddressLine(0);
            String city = addresses.get(0).getLocality();
            String state = addresses.get(0).getAdminArea();
            String country = addresses.get(0).getCountryName();
            String postalCode = addresses.get(0).getPostalCode();
            String knownName = addresses.get(0).getFeatureName();

            ro_gps_location.setText(state + " , " + city + " , " + country);
            ro_address.setText(address + " , " + knownName + " , " + postalCode);
        
     catch (IOException e) 
        // TODO Auto-generated catch block
        e.printStackTrace();