What am i trying to do is to get the GPS location from 2 providers, the first one is the GPS which is the most accurate, the second one is the aGPS which is a combination of GPS and network. I am doing that because aGPS can get location even in tall buildings when normal gps takes more time to get. What i want is to try getting location from the first provider(GPS) for 10 seconds, if in those 10 seconds i get a location!=null, i break the timed loop and take the result to the main thread, which is the main activity. ELSE ill take the location from the second provider(aGPS) if available. If none of the provider where able to get a location, i will return null after the 10 seconds. The problem i am facing is, when i do a timed loop, the app freezes for 10 seconds so im not able to get the location to the main activity.
Here i am trying to get the location on the HomeActivity class that extends Activity:
Button btnRedCross = (Button) this.findViewById(R.id.btnRedCross);
btnRedCross.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
OutRequestsDatabaseHandler db =new OutRequestsDatabaseHandler();
OutRequest outreq = new OutRequest();
outreq.setName("Red Cross");
//TODO get the message from LocalUser db
Calendar cal = Calendar.getInstance();
outreq.setDate(cal.getTimeInMillis());
outreq.setMessage("My Message");
outreq.setType("RedCross");
//outreq.setLongitude(12.123456);
//outreq.setLatitude(12.123456);
db.addOutRequest(HomeActivity.this, outreq);
//HERE I AM TRYING TO GET THE LOCATION
GPSTracker locationtracker=new GPSTracker(HomeActivity.this);
location=locationtracker.getLocation();
Log.i("LocationGetter","Result: Longitude:"+location[0]+" Latitude:"+location[1]);
}
});
}
This is the GPSTracker Class where the 2 providers try to get location:
public class GPSTracker{
Context con;
LocationManager locMgr;
private double longgps;
private double latgps;
private double longnetwork;
private double latnetwork;
private LocationListener gpsLocationListener;
private LocationListener networkLocationListener;
public GPSTracker(final Context context){
con = context;
locMgr = (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
LocationProvider high = locMgr.getProvider(locMgr.getBestProvider(
createFineCriteria(), true));
LocationProvider low = locMgr.getProvider(locMgr.getBestProvider(
createCoarseCriteria(), true));
//GET LOCATION FROM GPS
gpsLocationListener = new LocationListener() {
@Override
public void onStatusChanged(String provider, int status,
Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
context);
alertDialogBuilder
.setMessage(
"Please Enable GPS and Network For Accurate Result")
.setCancelable(false)
.setPositiveButton("Enable GPS",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
Intent callGPSSettingIntent = new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
context.startActivity(callGPSSettingIntent);
}
});
alertDialogBuilder.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = alertDialogBuilder.create();
alert.show();
}
@Override
public void onLocationChanged(Location location) {
longgps = location.getLongitude();
latgps = location.getLatitude();
//Log.i("LocationGetter", "GPS: Longitude:" + longgps+ " Latitude:" + latgps);
}
};
locMgr.requestLocationUpdates(high.getName(), 0, 0f,gpsLocationListener);
//GET LOCATION FROM GPS + NETWORK
networkLocationListener=new LocationListener() {
@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) {
// TODO Auto-generated method stub
}
@Override
public void onLocationChanged(Location location) {
longnetwork = location.getLongitude();
latnetwork = location.getLatitude();
//Log.i("LocationGetter", "Network: Longitude:"+ longnetwork + " Latitude:" + latnetwork);
}
};
locMgr.requestLocationUpdates(low.getName(), 0, 0f,networkLocationListener);
}
public static Criteria createFineCriteria() {
Criteria c = new Criteria();
c.setAccuracy(Criteria.ACCURACY_FINE);
c.setAltitudeRequired(false);
c.setBearingRequired(false);
c.setSpeedRequired(false);
c.setCostAllowed(true);
c.setPowerRequirement(Criteria.POWER_HIGH);
return c;
}
public static Criteria createCoarseCriteria() {
Criteria c = new Criteria();
c.setAccuracy(Criteria.ACCURACY_COARSE);
c.setAltitudeRequired(false);
c.setBearingRequired(false);
c.setSpeedRequired(false);
c.setCostAllowed(true);
c.setPowerRequirement(Criteria.POWER_HIGH);
return c;
}
public double[] getLocation() {
double location[] = new double[2];
Calendar cal = Calendar.getInstance();
Long endtime = cal.getTimeInMillis() + 10000;
while (Calendar.getInstance().getTimeInMillis() < endtime) {
if (longgps != 0 && latgps != 0) {
location[0] = longgps;
location[1] = latgps;
Log.i("LocationGetter", "GPS: Longitude:" + location[0]
+ " Latitude:" + location[1]);
break;
} else if (longnetwork != 0 && latnetwork != 0) {
location[0] = longnetwork;
location[1] = latnetwork;
Log.i("LocationGetter", "Network: Longitude:" + location[0]
+ " Latitude:" + location[1]);
}
}
locMgr.removeUpdates(networkLocationListener);
locMgr.removeUpdates(gpsLocationListener);
networkLocationListener = null;
gpsLocationListener = null;
return location;
}
}
