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on the weather app i used to implement longitude and latitude from a GPS class. i call it on my on created.

but now that i have added the daily and weekly forecast it creates an error when i click on weeky or daily forecast:

protected void onCreate(Bundle savedInstanceState) {

     GPSTracker gps = new GPSTracker(MainActivity.this);

    final double latitude = gps.getLatitude();
    final double longitude = gps.getLongitude();

    mRefreshImageView.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            getForecast(latitude, longitude);

    getForecast(latitude, longitude);

    Log.d(TAG, "Main UI code is running!");