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Android

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) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ButterKnife.inject(this);
     GPSTracker gps = new GPSTracker(MainActivity.this);
    mProgressBar.setVisibility(View.INVISIBLE);

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

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

    getForecast(latitude, longitude);

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