我在android中创建了一个应用程序。我必须找到用户的当前位置,即城市名称 我使用下面的代码,它可以生成纬度和&经度,但没有得到城市的名称。
我的代码是:
public class GetCurrentLocation extends Activity implements OnClickListener {
private LocationManager locationMangaer=null;
private LocationListener locationListener=null;
private Button btnGetLocation = null;
private EditText editLocation = null;
private ProgressBar pb =null;
private static final String TAG = "Debug";
private Boolean flag = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//if you want to lock screen for always Portrait mode
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
pb = (ProgressBar) findViewById(R.id.progressBar1);
pb.setVisibility(View.INVISIBLE);
editLocation = (EditText) findViewById(R.id.editTextLocation);
btnGetLocation = (Button) findViewById(R.id.btnLocation);
btnGetLocation.setOnClickListener(this);
locationMangaer = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
}
@Override
public void onClick(View v) {
flag = displayGpsStatus();
if (flag) {
Log.v(TAG, "onClick");
editLocation.setText("Please!! move your device to see the changes in coordinates."+"\nWait..");
pb.setVisibility(View.VISIBLE);
locationListener = new MyLocationListener();
locationMangaer.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 10,
locationListener);
} else {
alertbox("Gps Status!!", "Your GPS is: OFF");
}
}
/*----------Method to Check GPS is enable or disable ------------- */
private Boolean displayGpsStatus() {
ContentResolver contentResolver = getBaseContext().getContentResolver();
boolean gpsStatus = Settings.Secure.isLocationProviderEnabled(
contentResolver, LocationManager.GPS_PROVIDER);
if (gpsStatus) {
return true;
} else {
return false;
}
}
/*----------Method to create an AlertBox ------------- */
protected void alertbox(String title, String mymessage) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Your Device's GPS is Disable")
.setCancelable(false)
.setTitle("** Gps Status **")
.setPositiveButton("Gps On",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// finish the current activity
// AlertBoxAdvance.this.finish();
Intent myIntent = new Intent(
Settings.ACTION_SECURITY_SETTINGS);
startActivity(myIntent);
dialog.cancel();
}
})
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// cancel the dialog box
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
/*----------Listener class to get coordinates ------------- */
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 Currrent City is: "+cityName;
editLocation.setText(s);
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
}
}
如何获取城市名称,即用户的当前位置(如德里,孟买等)?
答案 0 :(得分:1)
尝试这种方式:
List<Address> addresses = geocoder.getFromLocation(LATITUDE, LONGITUDE, 1);
if(addresses != null) {
Address returnedAddress = addresses.get(0);
StringBuilder strReturnedAddress = new StringBuilder("Address:\n");
for(int i=0; i<returnedAddress.getMaxAddressLineIndex(); i++) {
strReturnedAddress.append(returnedAddress.getAddressLine(i)).append("\n");
strReturnedAddress.append(returnedAddress.getLocality()).append("\n");
strReturnedAddress.append(areturnedAddress.getPostalCode()).append("\n");
strReturnedAddress.append(returnedAddress.getCountryName()).append("\n");
}
myAddress.setText(strReturnedAddress.toString());
有关更多信息,请访问:http://developer.android.com/reference/android/location/Geocoder.html
答案 1 :(得分:1)
试试这个 -
Geocoder geocoder = new Geocoder(getActivity(),Locale.ENGLISH);
StringBuilder stringBuilder = new StringBuilder();
List<Address> addressList;
try {
addressList = geocoder.getFromLocation(Latitude, Longitude, 1);
if (addressList.size() > 0) {
Address address = addressList.get(0);
for (int i = 0; i < address.getMaxAddressLineIndex(); i++) {
stringBuilder.append(address.getAddressLine(i)).append("\n");
stringBuilder.append(address.getLocality()).append("\n");
stringBuilder.append(address.getPostalCode()).append("\n");
stringBuilder.append(address.getCountryName()).append("\n");
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
不要忘记在清单中提供权限 -
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
答案 2 :(得分:0)
我建议使用Google Play服务来审核位置http://developer.android.com/google/play-services/location.html
如果您的应用可以安装在没有Google Play服务的设备中,请查看此代码https://github.com/BeyondAR/beyondar/tree/master/android/BeyondAR_Framework/src/com/beyondar/android/util/location并从位置管理器开始