Develop Reference

Get Location From Offline Application

I'd like to get Geo location by using GPS provider. So my code will be like this
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.provider.Settings;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
LocationManager lm;
TextView textLatitude, textLongitude;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textLatitude = (TextView)findViewById(R.id.textLatitude);
textLongitude = (TextView)findViewById(R.id.textLongitude);
lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
/* Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);*/
}
public void onResume() {
super.onResume();
setup();
}
public void onStart() {
super.onStart();
boolean gpsEnabled, networkEnabled;
gpsEnabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
Log.d("LocationService","GPS Status: "+gpsEnabled);
if(!gpsEnabled) {
networkEnabled =
lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if(!networkEnabled) {
Intent intent =
new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
}
}
public void onStop() {
super.onStop();
lm.removeUpdates(listener);
}
public void setup() {
lm.removeUpdates(listener);
String latitude = "Unknown";
String longitude = "Unknown";
Location gpsLocation = requestUpdatesFromProvider(
LocationManager.GPS_PROVIDER, "GPS not supported");
if(gpsLocation != null) {
Log.d("Location Service","GET FROM GPS");
latitude = String.format("%.7f", gpsLocation.getLatitude());
longitude = String.format("%.7f", gpsLocation.getLongitude());
}
textLatitude.setText(latitude);
textLongitude.setText(longitude);
}
public Location requestUpdatesFromProvider(final String provider
, String error) {
Location location = null;
if (lm.isProviderEnabled(provider)) {
lm.requestLocationUpdates(provider, 0, 0, listener);
Log.d("LocationService","Requesting...");
location = lm.getLastKnownLocation(provider);
//Log.d("LocationSerivce", "Geo :"+location.getLatitude());
} else {
Toast.makeText(this, error, Toast.LENGTH_LONG).show();
}
return location;
}
public LocationListener listener = new LocationListener() {
public void onLocationChanged(Location location) {
textLatitude.setText(String.format("%.7f", location.getLatitude()));
textLongitude.setText(String.format("%.7f",location.getLongitude()));
}
public void onProviderDisabled(String provider) { }
public void onProviderEnabled(String provider) { }
public void onStatusChanged(String provider
, int status, Bundle extras) { }
};
}
The result is ... IT DOESN'T WORK. What have I done wrong?
I've also added permission to manifest file already.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.locationservice"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name
="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.locationservice.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
I search a lot from Internet and I got that it'll work if I combine with Network provider and I have to use internet to get my location. This is not what I want.
I want to get Location from GPS only because I'll use for offline application.
Could you give me any great suggestion. I'll thanks a lot

LocationManager requestLocationUpdates not working

I Have This Creepy problem. i am trying to get the location of my emulator. it working fine when i get the location of my emulator. but when i change my location coordinates nothing happens. gps is working fine.
Here is my code
Main.java
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;
public class Main extends Activity {
TextView tvStatus;
LocationManager lm;
boolean gpsEnabled;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvStatus = (TextView) findViewById(R.id.textView1);
lm = (LocationManager) getSystemService(LOCATION_SERVICE);
if (lm.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
Log.d("", "GPS is Active");
Location l = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
tvStatus.setText(l.getLatitude()+" , "+l.getLongitude());
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
new LocationListener() {
#Override
public void onStatusChanged(String arg0, int arg1,
Bundle arg2) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
#Override
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
#Override
public void onLocationChanged(Location arg0) {
tvStatus.setText("GPS ENABLED: " + gpsEnabled
+ "\nLatitude: " + arg0.getLatitude()
+ "\nLongitude: " + arg0.getLongitude());
}
});
}
}
}
Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.enabelinglocationprovider"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="5"
android:targetSdkVersion="10" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.enabelinglocationprovider.Main"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

Samsung phones have this problem. There is hack to this. You need to kick the locationmanager on the butt to get the latest location from the maps cache.
God.locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,
new LocationListener() {
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
#Override
public void onProviderEnabled(String provider) {
}
#Override
public void onProviderDisabled(String provider) {
}
#Override
public void onLocationChanged(final Location location) {
}
});
currentLocation = God.locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
Call getLastKnownLocation after kicking the requestLocationUpdates with 0's.

It happens with emulators, try rebooting the emulator.
Or, close both eclipse and emulator and start both again

How should I send my GPS coordinates by SMS?

I'm getting problems using the SmsManager to sending coordinates via SMS.
I had a problem with the transfer variables between classes, so I used Intent and Bundle, but it displays only NULL.
Does this method is wrong?
Database should I use? Please help ?
ZoltrixGPSActivity Class
package com.zoltrix.gps;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class ZoltrixGPSActivity extends Activity {
TextView textLat;
TextView textLong;
TextView textAlt;
TextView textPro;
TextView textAcc;
TextView textSpeed;
public String onLocat;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btn1 = (Button) findViewById(R.id.buttonExit);
btn1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// exit
finish();
System.exit(0);
}
});
textLat = (TextView) findViewById(R.id.textLat);
textLong = (TextView) findViewById(R.id.textLong);
textAlt = (TextView) findViewById(R.id.textAlt);
textPro = (TextView) findViewById(R.id.textPro);
textAcc = (TextView) findViewById(R.id.textAcc);
textSpeed = (TextView) findViewById(R.id.textSpeed);
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
LocationListener ll = new mylocationlistener();
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll);
}
class mylocationlistener implements LocationListener {
public void onLocationChanged(Location location) {
if (location != null) {
double pLong = location.getLongitude();
double pLat = location.getLatitude();
double pAlt = location.getAltitude();
String PPro = location.getProvider();
float PAcc = location.getAccuracy();
float PSpeed = location.getSpeed();
textLat.setText(Double.toString(pLat));
textLong.setText(Double.toString(pLong));
textAlt.setText(Double.toString(pAlt));
textPro.setText(PPro);
textAcc.setText(Float.toString(PAcc));
textSpeed.setText(Double.toString(PSpeed));
Intent i = new Intent(ZoltrixGPSActivity.this,
SendSMSActivity.class);
i.putExtra("wysokosc", pLat);
i.putExtra("speed", PSpeed);
startActivity(i);
}
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
}
SendSMSActivity Class
package com.zoltrix.gps;
import android.app.Activity;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.Button;
public class SendSMSActivity extends Activity {
Button btnSendSMS;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnSendSMS = (Button) findViewById(R.id.btnSendSMS);
btnSendSMS.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
Bundle extras = getIntent().getExtras();
String ALT = extras.getString("wysokosc");
String SPE = extras.getString("speed");
sendSMS("510100100", "wys" + " " + ALT + " " + "spee" + " - "
+ SPE);
}
});
}
// ---sends an SMS message to another device---
private void sendSMS(String phoneNumber, String message) {
SmsManager sms = SmsManager.getDefault();
sms.sendTextMessage(phoneNumber, null, message, null, null);
}
}
Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.zoltrix.gps"
android:versionCode="1"
android:versionName="1.2" >
<uses-sdk
android:minSdkVersion="4"
android:targetSdkVersion="8" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.RECEIVE_SMS" />
<uses-permission android:name="android.permission.SEND_SMS" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity
android:name="com.zoltrix.gps.SendSMSActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.zoltrix.gps.ZoltrixGPSActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

try as:
i.putExtra("wysokosc",Double.toString(pLat));
i.putExtra("speed", Float.toString(PSpeed));
instead of
i.putExtra("wysokosc", pLat);
i.putExtra("speed", PSpeed);
and declare ZoltrixGPSActivity as in manifast.xml :
<activity
android:name=".ZoltrixGPSActivity" />
instead of
<activity
android:name="com.zoltrix.gps.ZoltrixGPSActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
and add these permissions also in manifast
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

you are putting double & float and taking as string from intent try to make same the both
try this way once ..
i.putExtra("wysokosc", pLat+"");
i.putExtra("speed", PSpeed+"");

Longitude and latitude are not being displayed

I am trying to display the users' position using GPS. I have written the following code so that if GPS is disabled on the device, then the user should enable it by going to the settings.If it is enabled then it should show the current position of the user. I am running the application on a android device. I don't get any errors when running the application but the position will not be displayed. Please help
------------Main Activity--------------------
package com.android.disasterAlertApp;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
LocationListener ll = new mylocationlistener();
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll);
if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){
Toast.makeText(this, "GPS is Enabled in your devide", Toast.LENGTH_SHORT).show();
}
else{
showGPSDisabledAlertToUser();
}
}
private void showGPSDisabledAlertToUser(){
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setMessage("GPS is disabled.Do you want to enable it?")
.setCancelable(false)
.setPositiveButton("Goto Settings Page To Enable GPS",
new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id){
Intent callGPSSettingIntent = new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(callGPSSettingIntent);
}
});
alertDialogBuilder.setNegativeButton("Cancel",
new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id){
dialog.cancel();
}
});
AlertDialog alert = alertDialogBuilder.create();
alert.show();
}
private class mylocationlistener implements LocationListener {
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();
}
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
}
------------Manifest-----------------
<uses-sdk android:minSdkVersion="8" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity
android:name=".Splash"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.android.disasterAlertApp.MAINACTIVITY" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION"></uses-permission>
<uses-permission android:name="android.permission.CONTROL_LOCATION_UPDATES"></uses-permission>
</manifest>

For getting GPS positions it takes time and if your inside a building its difficult to get gps values, if the device is in outside of a bulding we can get gps values..

Add this permission in manifest file
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

Make sure that your device GPS hardware is working. I had 2 brand new LG Lucid phones and the GPS did not work on either of them. On the location settings check only the GPS box and then start Google Map to see if it can obtain location.

Auto Sends GPS Coordinates via SMS

I made an Application that shows my GPS coordinates (Langitude and Latitude) number, which designed with out a map. But I would like to send the lat and long to mobile number/phone number Automatically (no need a send button) every time I open this Application. Anyone can help me..
Gps.java
package Sample.gps.send;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.Toast;
public class Gps extends Activity
{
#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)
{
loc.getLatitude();
loc.getLongitude();
String Text = "My 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)
{
}
}
}
Here is for the AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="Sample.gps.send"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="#drawable/icon"
android:label="#string/app_name">
<activity android:name=".UseGps"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION">
</uses-permission>
<uses-permission android:name="android.permission.SEND_SMS">
</uses-permission>
</manifest>
Here MyLocationListener is an inner class. Can anyone tell how to retrieve the coordinates whenever onLocationChanged method is called? The location is displayed using a Toast. Is it possible to get the coordinates by calling any method from onCreate()?

See, http://mobiforge.com/developing/story/sms-messaging-android. That tutorial will show you how to send an SMS, using that you should be able to figure out what you need to do.
Please use the code tags when posting code samples :-)