Android Open Source - Sunshine Forecast Fragment

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Back to project page Sunshine.

License

The source code is released under:

GNU General Public License

Java Source Code

package la.sonny.sunshine;
//from  w w w  .  j  av a 2s .c o m
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Fragment;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;


/**
 * A simple {@link Fragment} subclass.
 * Activities that contain this fragment must implement the
 * {@link ForecastFragment.OnFragmentInteractionListener} interface
 * to handle interaction events.
 * Use the {@link ForecastFragment#newInstance} factory method to
 * create an instance of this fragment.
 *
 */
public class ForecastFragment extends Fragment {

    ArrayAdapter<String> mForecastAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setHasOptionsMenu(true);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        // Inflate the menu; this adds items to the action bar if it is present.
        super.onCreateOptionsMenu(menu, inflater);
        inflater.inflate(R.menu.forecastfragment, menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_refresh) {
            updateWeather();
            return true;
        } else if (id == R.id.action_map) {
            startMap();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        mForecastAdapter =
                new ArrayAdapter<String>(
                        getActivity(),
                        R.layout.list_item_forecast,
                        R.id.list_item_forecast_textview,
                        new ArrayList<String>());

        View rootView = inflater.inflate(R.layout.fragment_main, container, false);

        ListView listView = (ListView) rootView.findViewById(R.id.listview_forecast);
        listView.setAdapter(mForecastAdapter);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
                String forecast = mForecastAdapter.getItem(position);
                Intent intent = new Intent(getActivity(), DetailActivity.class)
                        .putExtra(Intent.EXTRA_TEXT, forecast);
                startActivity(intent);
            }
        });

        return rootView;
    }

    private void updateWeather() {
        FetchWeatherTask weatherTask = new FetchWeatherTask();
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
        String location = preferences.getString(getString(R.string.pref_location_key),
                getString(R.string.pref_location_default));

        // Country code needed to render correct city based on zipcode
        // location += ",US";
        weatherTask.execute(location);
    }

    private void startMap() {
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
        String location = preferences.getString(getString(R.string.pref_location_key),
                getString(R.string.pref_location_default));

        Uri geoLocation = Uri.parse("geo:0,0").buildUpon()
                .appendQueryParameter("q", location).build();

        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setData(geoLocation);
        String debug = intent.getData().toString();
        Log.d("MAPS MAPS MAPS!!!!", debug);
        startActivity(intent);
    }

    @Override
    public void onStart() {
        super.onStart();
        updateWeather();
    }

    public class FetchWeatherTask extends AsyncTask<String, Void, String[]> {
        private final String LOG_TAG = FetchWeatherTask.class.getSimpleName();

        private String getReadableDateString(long time){
            // API returns a unix timestamp (seconds).
            // Must be converted to milliseconds in order to be converted to valid date.
            Date date = new Date(time * 1000);
            SimpleDateFormat format = new SimpleDateFormat("E, MMM d");
            return format.format(date).toString();
        }

        /**
         * Format low/high weather.
         */
        private String formatHighLows(double high, double low) {
            // Default data is fetched in Celsius
            // Convert the values from C to F is user chooses setting
            SharedPreferences sharedPrefs =
                    PreferenceManager.getDefaultSharedPreferences(getActivity());
            String unitType = sharedPrefs.getString(
                    getString(R.string.pref_units_key),
                    getString(R.string.pref_units_metric));

            if (unitType.equals(getString(R.string.pref_units_imperial))) {
                high = (high * 1.8) + 32;
                low = (low * 1.8) + 32;
            }

            // For presentation, assume the user doesn't care about tenths of a degree.
            long roundedHigh = Math.round(high);
            long roundedLow = Math.round(low);

            String highLowStr = roundedHigh + "/" + roundedLow;
            return highLowStr;
        }

        /**
         * Pull out data we need to construct the Strings needed.
         */
        private String[] getWeatherDataFromJson(String forecastJsonStr, int numDays)
                throws JSONException {

            // Names of the JSON objects that need to be extracted.
            // OWM - OpenWeatherMap
            final String OWM_LIST = "list";
            final String OWM_WEATHER = "weather";
            final String OWM_TEMPERATURE = "temp";
            final String OWM_MAX = "max";
            final String OWM_MIN = "min";
            final String OWM_DATETIME = "dt";
            final String OWM_DESCRIPTION = "main";

            JSONObject forecastJson = new JSONObject(forecastJsonStr);
            JSONArray weatherArray = forecastJson.getJSONArray(OWM_LIST);

            String[] resultStrs = new String[numDays];
            for(int i = 0; i < weatherArray.length(); i++) {
                String day;
                String description;
                String highAndLow;

                // Day JSON object
                JSONObject dayForecast = weatherArray.getJSONObject(i);

                // Make date human-readable.
                long dateTime = dayForecast.getLong(OWM_DATETIME);
                day = getReadableDateString(dateTime);

                // description is child array "weather", which is 1 elements long.
                JSONObject weatherObject = dayForecast.getJSONArray(OWM_WEATHER).getJSONObject(0);
                description = weatherObject.getString(OWM_DESCRIPTION);

                // Temperatures are in child object called "temp".
                JSONObject temperatureObject = dayForecast.getJSONObject(OWM_TEMPERATURE);
                double high = temperatureObject.getDouble(OWM_MAX);
                double low = temperatureObject.getDouble(OWM_MIN);

                highAndLow = formatHighLows(high, low);
                resultStrs[i] = day + " - " + description + " - " + highAndLow;
            }

            return resultStrs;
        }

        @Override
        protected String[] doInBackground(String... params) {

            // These two need to be declared outside the try/catch
            // so that they can be closed in the finally block.
            HttpURLConnection urlConnection = null;
            BufferedReader reader = null;

            // URL Params
            String forecastJsonStr = null;
            String mode = "json";
            String units = "metric";
            String dayCount = "7";

            try {
                // Construct the URL for the OpenWeatherMap query.
                // Other parameters are available at OWM's forecast API page at http://openweathermap.org/API#forecast

                final String BASE_URL = "http://api.openweathermap.org/data/2.5/forecast/daily";
                final String QUERY_PARAM = "q";
                final String MODE_PARAM = "mode";
                final String UNITS_PARAM = "units";
                final String COUNT_PARAM = "cnt";

                Uri uri = Uri.parse(BASE_URL).buildUpon().appendQueryParameter(QUERY_PARAM, params[0])
                        .appendQueryParameter(MODE_PARAM, mode).appendQueryParameter(UNITS_PARAM, units)
                        .appendQueryParameter(COUNT_PARAM, dayCount).build();

                URL url = new URL(uri.toString());
                Log.d(LOG_TAG, "Built URI: " + url.toString());

                // Create request to OpenWeatherMap. Open connection.
                urlConnection = (HttpURLConnection) url.openConnection();
                urlConnection.setRequestMethod("GET");
                urlConnection.connect();

                // Read the input stream into a String
                InputStream inputStream = urlConnection.getInputStream();
                StringBuffer buffer = new StringBuffer();
                if (inputStream == null) {
                    // Do nothing if null.
                    forecastJsonStr = null;
                }
                reader = new BufferedReader(new InputStreamReader(inputStream));

                String line;
                while ((line = reader.readLine()) != null) {
                    // Added newline for debugging buffer.
                    buffer.append(line + "\n");
                }

                if (buffer.length() == 0) {
                    // Stream is empty.  Nothing to parse.
                    forecastJsonStr = null;
                }
                forecastJsonStr = buffer.toString();

                Log.v(LOG_TAG, "Forecast JSON String: " + forecastJsonStr);

            } catch (IOException e) {
                Log.e(LOG_TAG, "Error ", e);
                forecastJsonStr = null;
            } finally{
                if (urlConnection != null) {
                    urlConnection.disconnect();
                }
                if (reader != null) {
                    try {
                        reader.close();
                    } catch (final IOException e) {
                        Log.e(LOG_TAG, "Error closing stream", e);
                    }
                }
            }

            try {
                return getWeatherDataFromJson(forecastJsonStr, Integer.parseInt(dayCount));
            } catch (JSONException e) {
                Log.e(LOG_TAG, e.getMessage(), e);
                e.printStackTrace();
            }

            return null;
        }

        @Override
        protected void onPostExecute(String[] forecast) {
            if (forecast != null) {
                mForecastAdapter.clear();
                for(String dayForecast : forecast) {
                    mForecastAdapter.add(dayForecast);
                }
            }
        }
    }

}

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