https://github.com/dvdme/forecastio-lib-java

weather

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;

//note that it's not this name anymore, update it!
import dme.forecastiolib.FIOCurrently;
import dme.forecastiolib.FIODaily;
import dme.forecastiolib.ForecastIO;

public class MainActivity extends Activity {

    final static String APIKEY = YOUR_API_KEY;

    private ListView mainListView ;  
    private ArrayAdapter<String> listAdapter ;  

    /** Called when the activity is first created. */  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  

        // Find the ListView resource.   
        mainListView = (ListView) findViewById( R.id.mainListView );  

        // Create ArrayAdapter using the planet list.  
        listAdapter = new ArrayAdapter<String>(this, R.layout.simple_row);  

        new AsyncCaller().execute();

        // Set the ArrayAdapter as the ListView's adapter.  
        mainListView.setAdapter( listAdapter );

    }  

    private class AsyncCaller extends AsyncTask<Void, Void, ForecastIO> {
        ProgressDialog pdLoading = new ProgressDialog(MainActivity.this);

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            Log.d("My Info", "Inside onPreExecute");
            //this method will be running on UI thread
            pdLoading.setMessage("\tLoading...");
            pdLoading.show();
        }

        @Override
        protected ForecastIO doInBackground(Void... params) {

            //this method will be running on background thread so don't update UI frome here
            //do your long running http tasks here,you dont want to pass argument and u can access the parent class' variable url over here
            String apikey = APIKEY;
            ForecastIO fio = new ForecastIO(apikey);
            fio.setUnits(ForecastIO.UNITS_SI);
            fio.setLang(ForecastIO.LANG_ENGLISH);
            fio.getForecast("38.7252993" , "-9.1500364");

            return fio;
        }

        @Override
        protected void onPostExecute(ForecastIO result) {
            super.onPostExecute(result);
            pdLoading.dismiss();

            //Currently data
            FIOCurrently currently = new FIOCurrently(result);

            //Daily data
            FIODaily daily = new FIODaily(result);

            //Currently data
            listAdapter.add("Currently Data:");
            String [] f  = currently.get().getFieldsArray();
            for(int i = 0; i<f.length;i++){
                listAdapter.add( f[i]+": "+currently.get().getByKey(f[i]) );
            }

            //Daily data
            listAdapter.add("Currently Data:");
            for(int i = 0; i<daily.days(); i++){
                String [] h = daily.getDay(i).getFieldsArray();
                listAdapter.add("Day #"+(i+1));
                for(int j=0; j<h.length; j++)
                    listAdapter.add(h[j]+": "+daily.getDay(i).getByKey(h[j]));
            }

        }

    }

}