this is my code in android and is showing error. I dont know what is wrong but i am certaqin it has to do something with LocationManager because until that line it works fine.
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d("Exception", "Something gone wrong !! ");
/*after this line it shows error */
LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
double longitude = location.getLongitude();
double latitude = location.getLatitude();
All i want right now is to display value of longitude and latitude so that i can be sure code is good till here.
Declate this variable
Location loc;
Write this code in Oncreate() method
LocationManager mlocManager =(LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
Then Write
loc.getLatitude();
loc.getLongitude();
Now you can use the value of latitude and longitude... :-)
Use Below Code Snippet
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/* Use the LocationManager class to obtain GPS locations */
LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
}
/* Class My Location Listener */
public class MyLocationListener implements LocationListener
{
#Override
public void onLocationChanged(Location loc)
{
loc.getLatitude();
loc.getLongitude();
String Text = "My current location is: " +
"Latitud = " + loc.getLatitude() +
"Longitud = " + loc.getLongitude();
Toast.makeText( getApplicationContext(), Text, Toast.LENGTH_SHORT).show();
}
#Override
public void onProviderDisabled(String provider)
{
Toast.makeText( getApplicationContext(), "Gps Disabled", Toast.LENGTH_SHORT ).show();
}
#Override
public void onProviderEnabled(String provider)
{
Toast.makeText( getApplicationContext(), "Gps Enabled", Toast.LENGTH_SHORT).show();
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
}
}
Check Below Line in Manifest file
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
Related
I am trying to get the current location (latitude and longitude values) in my application.
I used the below code.
Problem is----------------->
When the Best provider is GPS,Location returned is null.
I learned some SO posts and I added LocationListener to my code,then it worked but when I restart my device and I run the application again,it gives the same NULL values when Provider is GPS. I don't understand why its not working now.
I also learned that Gps provider is slow in getting values,so I have to add LocationListener to solve this issue.So,I added this to my code
LocationListener locationListener = new MyLocationListener();
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 35000, 10, locationListener);
complete code here ----------->
public void getCurrentlocation()
{
String providers = Settings.Secure.getString(getContentResolver(), Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
Log.e("provider"," "+providers);
if(!providers.contains("gps")){
final Intent poke = new Intent();
poke.setClassName("com.android.settings", "com.android.settings.widget.SettingsAppWidgetProvider");
poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
poke.setData(Uri.parse("3"));
sendBroadcast(poke);
Log.e("your gps is","enabled");
}
LocationListener locationListener = new MyLocationListener();
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 35000, 10, locationListener);
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 35000, 10, locationListener);
// Define the criteria how to select the locatioin provider -> use
// default
Criteria criteria = new Criteria();
String provider = locationManager.getBestProvider(criteria,true);
Log.e("location provider",""+provider);
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null)
{
System.out.println("Provider " + provider + " has been selected.");
strLatitude=String.valueOf(location.getLatitude());
strLongitude=String.valueOf(location.getLongitude());
Log.e("lattitude",strLatitude);
Log.e("logntitude",strLongitude);
latituteField.setText( strLatitude);
longitudeField.setText(strLongitude);
}
else
{
strLatitude=String.valueOf(0);
strLongitude=String.valueOf(0);
Log.e("lattitude",strLatitude);
Log.e("logntitude",strLongitude);
latituteField.setText( strLatitude);
longitudeField.setText(strLongitude);
}
}
private class MyLocationListener implements LocationListener
{
#Override
public void onLocationChanged(Location location)
{
// mLattitude = location.getLatitude();
// mLongitude = location.getLongitude();
//
// Log.w("value : ",
// String.valueOf(location.getLatitude()) + String.valueOf(location.getLongitude())
// +
//
//
// context.sendBroadcast(new Intent(Constants.BRDCAST_LOCATION_UPDATED));
}
#Override
public void onProviderDisabled(String provider)
{
// Log.w("provider", provider);
}
#Override
public void onProviderEnabled(String provider)
{
// Log.w("provider", provider);
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
// Log.w("status", String.valueOf(status));
}
}
please help
Thanks in advance
Well I tried the following code and it fetched the latitude and longitude:
public class MainActivity extends Activity
{
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/* Use the LocationManager class to obtain GPS locations */
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
List<String> providers = lm.getProviders(true);
/* Loop over the array backwards, and if you get an accurate location, then break out the loop*/
Location location = null;
for (int i=providers.size()-1; i>=0; i--) {
location = lm.getLastKnownLocation(providers.get(i));
if (location != null) break;
}
String Text = "My current location is: " +
"Latitud = " + location.getLatitude() +
"Longitud = " + location.getLongitude();
Toast.makeText( getApplicationContext(), Text, Toast.LENGTH_SHORT).show();
}
AndroidManifest.xml:
See that the following permissions are set:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
i use the following code for getting the current latitude and longitude in services but it always return null. please help me.
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
System.out.println("provider "+provider);
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
Try this code for current location:
LocationManager mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 10,
10, mlocListener);
public class MyLocationListener implements LocationListener {
public void onProviderDisabled(String provider)
{
AlertDialog.Builder dlgAlert = new AlertDialog.Builder(
VisualCV.this);
dlgAlert.setMessage("Gps Disabled ");
dlgAlert.setTitle("Message");
dlgAlert.setPositiveButton("OK", null);
dlgAlert.setCancelable(true);
dlgAlert.create().show();
}
public void onProviderEnabled(String provider)
{
Toast.makeText( getApplicationContext(), "Gps enabled", Toast.LENGTH_SHORT ).show();
}
public void onStatusChanged(String provider, int status, Bundle extras)
{
}
public void onLocationChanged(Location loc)
{
// TODO Auto-generated method stub
Latitud = loc.getLatitude();
longtitude = loc.getLongitude();
lang = String.format("%.4f", longtitude);//LONGITUDE
lati = String.format("%.4f", Latitud);//LATITUDE
}
}
Use this piece of code may be it may help you
import com.example.ConfigClass;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
public class GpsListener {
public static GpsListener refrence = null ;
public LocationManager locationManager = null;
public LocationListener locationListener = null;
public Location location = null;
public static GpsListener getInstance(){
if(refrence == null){
refrence = new GpsListener();
}
return refrence;
}
public void startGpsCallBack(Context activityContext){
locationManager = (LocationManager) activityContext.getSystemService(Context.LOCATION_SERVICE);
locationListener = new mylocationlistener();
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
ConfigClass.latitudeValue = location.getLatitude();
ConfigClass.longitudeValue = location.getLongitude();
}
}
public class mylocationlistener implements LocationListener {
#Override
public void onLocationChanged(Location location) {
if (location != null) {
ConfigClass.latitudeValue = location.getLatitude();
ConfigClass.longitudeValue = location.getLongitude();
}
}
#Override
public void onProviderDisabled(String provider) {
}
#Override
public void onProviderEnabled(String provider) {
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
public void stopGpsCallBack(){
if (locationManager != null) {
locationManager.removeUpdates(locationListener);
}
}
public void startGpsCallbackAgain(Context activityContext){
locationManager = (LocationManager) activityContext.getSystemService(Context.LOCATION_SERVICE);
locationListener = new mylocationlistener();
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, 0, 0, locationListener);
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
ConfigClass.latitudeValue = location.getLatitude();
ConfigClass.longitudeValue = location.getLongitude();
}
}
}
This is my code
First startGpsCallBack, then stop it and then call startGPSCallBackAgain method
Check it and let me know if this solves your problem
Try this.
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/* Use the LocationManager class to obtain GPS locations */
LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
}
/* Class My Location Listener */
public class MyLocationListener implements LocationListener
{
public void onLocationChanged(Location loc)
{
loc.getLatitude();
loc.getLongitude();
String Text = "My current location is: " +
"Latitud = " + loc.getLatitude() +
"Longitud = " + loc.getLongitude();
Toast.makeText( getApplicationContext(), Text, Toast.LENGTH_SHORT).show();
}
public void onProviderDisabled(String provider)
{
Toast.makeText( getApplicationContext(), "Gps Disabled", Toast.LENGTH_SHORT ).show();
}
public void onProviderEnabled(String provider)
{
Toast.makeText( getApplicationContext(), "Gps Enabled", Toast.LENGTH_SHORT).show();
}
public void onStatusChanged(String provider, int status, Bundle extras)
{
}
}
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
LocationListener ll = new mylocationlistener();
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll);
I find the onLocationChanged function is PERFECTLY working when the location is Changed with the above code.
///////CLASS mylocationlistener
private class mylocationlistener implements LocationListener {
//#Override
public void onLocationChanged(Location location) {
if (location != null) {
Log.d("LOCATION CHANGED", location.getLatitude() + "");
Log.d("LOCATION CHANGED", location.getLongitude() + "");
Toast.makeText(MainActivity.this,
location.getLatitude() + "" + location.getLongitude(),
Toast.LENGTH_LONG).show();
p = new GeoPoint((int)location.getLatitude(),(int)location.getLongitude());
// p = new GeoPoint((int)8.538754,(int)76.950620);
}
}
//#Override
public void onProviderDisabled(String provider) {
}
// #Override
public void onProviderEnabled(String provider) {
}
// #Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
But the Problem is that I want the variable "p" to be filled with the current location , when the program starts, that is Before the First Change Help !!
try this code:
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the locatioin provider -> use
// default
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null) {
System.out.println("Provider " + provider + " has been selected.");
onLocationChanged(location);
} else {
latituteField.setText("Location not available");
longitudeField.setText("Location not available");
System.out.println("Location not avilable");
}
}
/* Request updates at startup */
#Override
protected void onResume() {
super.onResume();
locationManager.requestLocationUpdates(provider, 400, 1, this);
}
/* Remove the locationlistener updates when Activity is paused */
#Override
protected void onPause() {
super.onPause();
locationManager.removeUpdates(this);
}
#Override
public void onLocationChanged(Location location) {
double lat = (double) (location.getLatitude());
double lng = (double) (location.getLongitude());
latituteField.setText(String.valueOf(lat));
longitudeField.setText(String.valueOf(lng));
Log.i(TAG, "Lattitude:" +lat);
Log.i(TAG, "Longitude:" +lng);
}
Before you get fix, you can use coarse location. Check this link:
http://devdiscoveries.wordpress.com/2010/02/04/android-use-location-services/
I am attempting to create a simple application whereby GPS coordinates will be stored, and simply display on the screen of the next activity.
So far, I have managed to get the coordinates to display in a toast, so I know the code is working. I am having a problem with the logic. I am attempting to start a new activity (one which will display the coordinates) when the longitude and latitude is found.
Could anyone offer any suggestions as to how I might do something like this?
public class GPSActivity extends Activity{
float longitude = 0;
float latitude = 0;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/* Use the LocationManager class to obtain GPS locations */
LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
Intent intent = new Intent(this, Display.class);
Bundle extras = new Bundle();
do{
extras.putFloat("long", longitude);
extras.putFloat("lat", latitude);
}while(longitude == 0);
// if longitude is no longer zero - meaning it is found
// add extras and call activity.
if(longitude != 0){
intent.putExtras(extras);
startActivity(intent);
}} // end activity
/* Class My Location Listener */
public class MyLocationListener implements LocationListener {
#Override
public void onLocationChanged(Location loc) {
longitude = (float) loc.getLatitude();
latitude = (float) loc.getLongitude();
String text = "My current location is: " + "Latitud = " + loc.getLatitude() + "Longitud = " + loc.getLongitude();
Toast.makeText( getApplicationContext(), text, Toast.LENGTH_SHORT).show();
}
#Override
public void onProviderDisabled(String provider){
Toast.makeText( getApplicationContext(), "Gps Disabled", Toast.LENGTH_SHORT ).show();
}
#Override
public void onProviderEnabled(String provider) {
Toast.makeText( getApplicationContext(), "Gps Enabled", Toast.LENGTH_SHORT).show();
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras){
}
}} // End GPS activity
Not sure why you have put that section in onCreate(), but if you move it into onLocationChanged() it should work.
public class GPSActivity extends Activity{
float longitude = 0;
float latitude = 0;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/* Use the LocationManager class to obtain GPS locations */
LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
}
/* Class My Location Listener */
public class MyLocationListener implements LocationListener {
#Override
public void onLocationChanged(Location loc) {
longitude = (float) loc.getLatitude();
latitude = (float) loc.getLongitude();
String text = "My current location is: " + "Latitud = " + loc.getLatitude() + "Longitud = " + loc.getLongitude();
Toast.makeText( getApplicationContext(), text, Toast.LENGTH_SHORT).show();
Intent intent = new Intent(GPSActivity.this, Display.class);
Bundle extras = new Bundle();
extras.putFloat("long", longitude);
extras.putFloat("lat", latitude);
intent.putExtras(extras);
startActivity(intent);
}
In my app, i need to create an android service to periodically get mobile user's current location(latitude and longitude). The service should get user's location in every 5 minutes.. How can i do this in android service that would run in background. And is this the right approach?
You can write a private/internal class(within your service) that implements locationListener and in the onStart meethod of your service you can requestLocationUpdates which will be listened by your listener
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
MyLocationListener listener = new MyLocationListener();
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, minTime, minDistance, listener);
LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, mlocListener);
}
public class MyLocationListener implements LocationListener
{
#Override
public void onLocationChanged(Location loc)
{
Log.i("**************************************", "Location changed");
loc.getLatitude();
loc.getLongitude();
String Text = "My current location is: " +"Latitude = " + loc.getLatitude() + "Longitude = " + loc.getLongitude();
Toast.makeText( getApplicationContext(), Text, Toast.LENGTH_SHORT).show();
}
#Override
public void onProviderDisabled(String provider)
{
Toast.makeText( getApplicationContext(), "Gps Disabled", Toast.LENGTH_SHORT ).show();
}
#Override
public void onProviderEnabled(String provider)
{
Toast.makeText( getApplicationContext(), "Gps Enabled", Toast.LENGTH_SHORT).show();
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
}
}
You don't need a service to accomplish this. In order to get location every 5mins, in your app, on the activity you can implement the location listener. While setting up the location manager, you can specify the minTime = 5mins (300000 ms). The onlocationChanged method will be called every 5 mins or when the distance change > minDistance, which ever occurs first.
LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
MyLocationListener listener = new MyLocationListener();
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 300000, minDistance, listener);