CODEWITHSUNDEEP
javaandroidmultithreadinggpsonresume
TheQ
TheQ

Reputation: 2009

Threading and Progressbar in Android?

Hey guys so I'm trying to display gps distance between the user and some place on a card they can see. The problem is, I think the main thread splits or does 2 things at once. At the code below, Android makes a toast while doing the code in the if(flag) statement... so it toasts the GPS difference without getting the coordinates of the user...How do i make it so that, it does if(flag) statement first then goes on to do the toast after and outside the if statement? 

@Override
public void onResume()
{
    super.onResume();
    ImagePath = getIntent().getStringExtra("imagePath");
    if(ImagePath == null)
    {
        Toast.makeText(this,"hello everyone",Toast.LENGTH_LONG).show();
    }
    if(newCardAdded)
    {
        flag = displayGpsStatus();
        if(flag)
        {
            editLocation.setText("Please!! move your device to" +
                    " see the changes in coordinates." + "\nWait..");
            pb.setVisibility(View.VISIBLE);
            locationListener = new MyLocationListener();//LocationListener actually physically gets your location
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 10, locationListener);


        }
        else
        {
            alertbox("Gps Status!!", "Your GPS is: OFF");
        }
            Global_Class.getInstance().getValue().getlatitude = place_lat;
            Global_Class.getInstance().getValue().getlongitutde = place_lon;
            String gps_distance = String.valueOf(gps_difference(user_lon, user_lat,place_lon,place_lat));
            Toast.makeText(this, gps_distance, Toast.LENGTH_LONG).show();

    }

}

Upvotes: 0

Views: 74

Answers (1)

kientux
kientux

Reputation: 1792

LocationManager#requestLocationUpdates

Your locationListener must implement onLocationChanged(Location) method, which will be called for each location update. Then calculate distance and make a toast in that method. Because requestLocationUpdates(...) runs in another thread, there's no way to confirm that it is done before Toast.makeText(...), so you must use your MyLocationListener.

Upvotes: 1

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