I need to track user location continuously whether my application is running or not, for this i have a created a background Service and calculate latitude and longitude on Asyntask in this service , my code is running well in emulator but on device it got crashed after saying application is not responding. However log cat does not show any error. Please anybody help me. Thanks in Advance.
Here is MyService.java
public class MyService extends Service {
// flag for GPS status
public static LocationManager manager;
public static boolean isGPSEnabled = false;
public static double lattitude = 0;
public static double longitude = 0;
int count = 0;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
MyFile myFile;
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
} // method ends
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
super.onStartCommand(intent, flags, startId);
System.out.println("On Start Command is called ");
return START_STICKY;
} // method ends
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
System.out.println("Service is created//////////// ");
// start asyntask to get locations
Context mContext = MainActivity.getContextForService();
if(mContext!=null)
{
myFile = new MyFile(mContext);
}
new GetLocations().execute();
}// on create ends
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
System.out.println("Service is Destroyed //////////// ");
if (manager != null && isGPSEnabled == true) {
manager.removeUpdates(mylistener);
System.out.println("Service is Destroyed under if //////////// ");
}
} // method ends
public class GetLocations extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = manager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = manager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (isGPSEnabled) {
/*Criteria criteria = new Criteria();
String bestProvider = manager.getBestProvider(criteria, false);
Location location = manager.getLastKnownLocation(bestProvider);
double lat =location.getLatitude();
double longi =location.getLongitude();
System.out.println("getting location continous ////// Lattti " +location.getLatitude()
);
System.out.println("getting location continous ////// LONGITU " +
location.getLongitude());*/
manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,
0, mylistener);
File root = new File(Environment.getExternalStorageDirectory(),
"Notes");
if (!root.exists()) {
root.mkdirs();
}
} else {
Toast.makeText(MainActivity.getContextForService(),
"Please oN Gps ", Toast.LENGTH_LONG).show();
}
}
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
// getting current lattitude and longitude
return null;
}// method ends
}// asyntask class ends
void handleLocationChanged(Location loc) {
lattitude = loc.getLatitude();
longitude = loc.getLongitude();
if (count == 0) {
Toast.makeText(MainActivity.getContextForService(),
"lat is " + lattitude + " long is " + longitude,
Toast.LENGTH_LONG).show();
count = count + 1;
}
System.out.println("getting location continous ////// Lattti " +
lattitude);
System.out.println("getting location continous ////// LONGITU " +
longitude);
generateNoteOnSD("GpsTesting", "lattitude is" + lattitude + "\n"
+ " longitude" + longitude);
} // method ends
public LocationListener mylistener = new LocationListener() {
@Override
public void onLocationChanged(Location loc) {
handleLocationChanged(loc);
}
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
// Toast.makeText(mContext, "Gps is disable",
// Toast.LENGTH_SHORT).show();
}
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
// Toast.makeText(mContext, "Gps is on", Toast.LENGTH_SHORT).show();
}
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
// Toast.makeText(appcontext, "Gps status is chnged ",
// Toast.LENGTH_SHORT).show();
}
};
public void showSettingsAlert() {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(
MainActivity.getContextForService());
// Setting Dialog Title
alertDialog.setTitle("Alert");
// Setting Dialog Message
alertDialog
.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(
Settings.ACTION_LOCATION_SOURCE_SETTINGS);
getApplicationContext().startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}// method ends
// method for sending notiifcation
public void sendNotification() {
int MY_NOTIFICATION_ID = 1;
PendingIntent contentIntent = PendingIntent.getActivity(
getApplicationContext(), 0,
new Intent(MainActivity.getContextForService(),
MainActivity.class), 0);
Notification myNotification = new NotificationCompat.Builder(
getApplicationContext())
.setContentTitle("Notification for Lat and Long")
.setContentText("hi testing notiifaction on lat and long")
.setTicker(" ToDoList Notification")
.setWhen(System.currentTimeMillis())
.setContentIntent(contentIntent)
.setDefaults(Notification.DEFAULT_SOUND).setAutoCancel(true)
.setSmallIcon(R.drawable.ic_launcher).build();
NotificationManager notificationManager = (NotificationManager) MainActivity
.getContextForService().getSystemService(
Context.NOTIFICATION_SERVICE);
notificationManager.notify(MY_NOTIFICATION_ID, myNotification);
} // method ends
// writing file on
public void generateNoteOnSD(String sFileName, String sBody) {
try {
File root = new File(Environment.getExternalStorageDirectory(),
"Gps_Data");
if (!root.exists()) {
root.mkdirs();
}
File gpxfile = new File(root, sFileName);
FileWriter writer = new FileWriter(gpxfile);
writer.append(sBody);
writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
} // method ends
} // final class ends
Here is MainActivity.java
public class MainActivity extends Activity {
Button btnStart, btnStop;
public static Context mContext;
Intent it;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = this;
btnStart = (Button) findViewById(R.id.btnStart);
btnStop = (Button) findViewById(R.id.btnStop);
btnStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startService(getIntent());
}
});
btnStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
stopService(getIntent());
}
});
} // on create ends
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public Intent getIntent() {
it = new Intent(mContext, MyService.class);
return it;
} // method ends
public static Context getContextForService() {
return mContext;
} // methods ends
} // final class ends
