Question

我已经实现了这段代码来显示基于GPS的地址。纬度和经度工作正常（出现在屏幕上）但是，对于地址，它代表“没有找到地址”。请查看此代码并指出任何错误。谢谢

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_find__location);

    LocationManager locationManager;
    String context = Context.LOCATION_SERVICE;
    locationManager =(LocationManager)getSystemService(context);

    Criteria criteria = new Criteria();
    criteria.setAccuracy(Criteria.ACCURACY_FINE);
    criteria.setAltitudeRequired(false);
    criteria.setBearingRequired(false);
    criteria.setCostAllowed(true);
    criteria.setPowerRequirement(Criteria.POWER_LOW);
    String provider = locationManager.getBestProvider(criteria, true);

    //String provider = LocationManager.GPS_PROVIDER;
    Location location = locationManager.getLastKnownLocation(provider);
    updateWithNewLocation(location);

    locationManager.requestLocationUpdates(provider, 2000, 10, locationListener);

    //buttons assigned
    Button mainMenuBtn = (Button) findViewById(id.mainMenuBtn);

    mainMenuBtn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            finish();


        }
    });
}

    private final LocationListener locationListener = new LocationListener() {

            @Override
    public void onLocationChanged(Location location) {
        updateWithNewLocation(location);

    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderDisabled(String provider) {
        updateWithNewLocation(null);

    }


};

private void updateWithNewLocation(Location location) {
    String latLong;
    TextView myLocationText;
    myLocationText = (TextView)findViewById(R.id.myLocationText);

    String addressString = "no address found";

    if(location != null){
        double lat = location.getLatitude();
        double lng = location.getLongitude();
        latLong = "Lat: "+lat+"\nLong: "+lng;

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


        Geocoder gc = new Geocoder(this,Locale.getDefault());
        try{

            List<Address> addresses = gc.getFromLocation(lat, lng, 1);
            StringBuilder sb = new StringBuilder();
            if (addresses.size() > 0){
                Address address = addresses.get(0);

                for(int i=0; i < address.getMaxAddressLineIndex(); i++)

                    sb.append(address.getAddressLine(i)).append("\n");
                    sb.append(address.getLocality()).append("\n");
                    sb.append(address.getPostalCode()).append("\n");
                    sb.append(address.getCountryName());
            }

              addressString = sb.toString();

        }catch (IOException e){}
    }else{
        latLong = "No location found";
    }

    myLocationText.setText("Your coordinates are:\n"+latLong + "\n"+addressString);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.find__location, menu);
    return true;
}

}

Answer 1

我遇到了同样的问题，非常讨厌。一些答案表明地理编码器并不总是返回一个值，所以你必须循环一些。然而，这不是一个好方法，因为你可能永远不会得到一个值，有时候就是这种情况。因此，我在我的项目中所做的是使用谷歌的反向地理编码API。想法是一样的，但方法论是不同的。

这是api页面：https://developers.google.com/maps/documentation/geocoding/

在此处查看第一个答案：Android Geocoder getFromLocationName always returns null 希望这有帮助

Answer 2

我更喜欢使用Google地理编码API获取地址，通过发送lat lon params，您将获得一些信息 https://developers.google.com/maps/documentation/geocoding/

如何从纬度和经度获得地址？

2 个答案: