Android Open Source - Sunshine Forecast Fragment

• Back to Weather/sunshine  ↑

From Project

Back to project page Sunshine.

License

The source code is released under:

MIT License

Java Source Code

package com.example.android.sunshine.app;
/*ww  w. j  a  va  2 s  .c o  m*/
/**
 * Created by damodar on 09/09/14.
 */

import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.app.Fragment;
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 android.widget.Toast;

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.Arrays;
import java.util.Date;
import java.util.List;

/**
 * A placeholder fragment containing a simple view.
 */
public class ForecastFragment extends Fragment {

    public static ArrayAdapter<String> mForecastAdapter;

    @Override
    public void onCreate(Bundle savedInstance) {
        super.onCreate(savedInstance);
        setHasOptionsMenu(true);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.forecastfragment, menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if(id == R.id.action_refresh) {
            updateWeather();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

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

    public ForecastFragment() {
    }

    private void updateWeather()
    {
        FetchWeatherTask weatherTask = new FetchWeatherTask();

        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
        String location = prefs.getString(getString(R.string.pref_location_key), getString(R.string.pref_location_default));
        String numOfDays = prefs.getString(getString(R.string.pref_days_key), getString(R.string.pref_days_default));

//        if(isNetworkAvailable())
            weatherTask.execute(location, numOfDays);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);

        String[] forecastArray = {
                "Today - Sunny 86/43",
                "Tomorrow - cloudy 86/43",
                "Wednesday - Rainy 86/43",
                "Thursday - Storm 86/43",
                "Friday - Party 86/43",
                "Saturday - Hangover 86/43",
                "Sunday - Bounce back 86/43"
        };

        List<String> weekForecast = new ArrayList<String>(
                Arrays.asList(forecastArray)
        );

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

        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);
                Toast.makeText(getActivity(), forecast, Toast.LENGTH_SHORT).show();

                Intent intent = new Intent(getActivity(), DetailActivity.class)
                        .putExtra(Intent.EXTRA_TEXT,forecast);
                startActivity(intent);

            }
        });

        return rootView;
    }

    public class FetchWeatherTask extends AsyncTask<String, Void, String[]> {

        private final String LOG_TAG = FetchWeatherTask.class.getSimpleName();

        /* The date/time conversion code is going to be moved outside the asynctask later,
 * so for convenience we're breaking it out into its own method now.
 */
        private String getReadableDateString(long time){
            // Because the API returns a unix timestamp (measured in seconds),
            // it 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();
        }

        /**
         * Prepare the weather high/lows for presentation.
         */
        private String formatHighLows(double high, double low) {

            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
            String unitType = prefs.getString(
                    getString(R.string.pref_temperature_units_key),
                    getString(R.string.pref_temperature_units_metric));

            if(unitType.equals(getString(R.string.pref_temperature_units_imperial))) {
                high = (high * 1.8) + 32;
                low = (low * 1.8) + 32;
            } else if(!unitType.equals(getString(R.string.pref_temperature_units_metric))) {
                Log.d(LOG_TAG, "unit type not found: " + unitType);
            }

            // 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;
        }

        /**
         * Take the String representing the complete forecast in JSON Format and
         * pull out the data we need to construct the Strings needed for the wireframes.
         *
         * Fortunately parsing is easy:  constructor takes the JSON string and converts it
         * into an Object hierarchy for us.
         */
        private String[] getWeatherDataFromJson(String forecastJsonStr, int numDays)
                throws JSONException {

            // These are the names of the JSON objects that need to be extracted.
            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++) {
                // For now, using the format "Day, description, hi/low"
                String day;
                String description;
                String highAndLow;

                // Get the JSON object representing the day
                JSONObject dayForecast = weatherArray.getJSONObject(i);

                // The date/time is returned as a long.  We need to convert that
                // into something human-readable, since most people won't read "1400356800" as
                // "this saturday".
                long dateTime = dayForecast.getLong(OWM_DATETIME);
                day = getReadableDateString(dateTime);

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

                // Temperatures are in a child object called "temp".  Try not to name variables
                // "temp" when working with temperature.  It confuses everybody.
                JSONObject temperatureObject = dayForecast.getJSONObject(OWM_TEMPERATURE);
                double low = temperatureObject.getDouble(OWM_MIN);
                double high = temperatureObject.getDouble(OWM_MAX);

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

            return resultStrs;
        }

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


            if(params.length == 0) {
                return null;
            }

            // 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;

// Will contain the raw JSON response as a string.
            String forecastJsonStr = null;

            String format = "json";
            String units = "metric";
//            int numOfDays = 14;

            try {
                // Construct the URL for the OpenWeatherMap query
                // Possible parameters are avaiable at OWM's forecast API page, at
                // http://openweathermap.org/API#forecast
                // URL url = new URL("http://api.openweathermap.org/data/2.5/forecast/daily?q=560001&mode=json&units=metric&cnt=7");

                final String BASE_URL = "http://api.openweathermap.org/data/2.5/forecast/daily?";

                final String QUERY_PARAM = "q";
                final String FORMAT_PARAM = "mode";
                final String UNITS_PARAM = "units";
                final String DAYS_PARAM = "cnt";

                Uri builtUri = Uri.parse(BASE_URL).buildUpon()
                        .appendQueryParameter(QUERY_PARAM,params[0])
                        .appendQueryParameter(FORMAT_PARAM, format)
                        .appendQueryParameter(UNITS_PARAM, units)
                        .appendQueryParameter(DAYS_PARAM, params[1])
                        .build();

                Log.v(LOG_TAG, "Built URI: " + builtUri.toString());

                URL url = new URL(builtUri.toString());

                // Create the request to OpenWeatherMap, and open the 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) {
                    // Nothing to do.
                    forecastJsonStr = null;
                }
                reader = new BufferedReader(new InputStreamReader(inputStream));

                String line;
                while ((line = reader.readLine()) != null) {
                    // Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
                    // But it does make debugging a *lot* easier if you print out the completed
                    // buffer for debugging.
                    buffer.append(line + "\n");
                }

                if (buffer.length() == 0) {
                    // Stream was empty.  No point in parsing.
                    forecastJsonStr = null;
                }
                forecastJsonStr = buffer.toString();

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

            } catch (IOException e) {
                Log.e("ForecastFragment", "Error ", e);
                // If the code didn't successfully get the weather data, there's no point in attemping
                // to parse it.
                forecastJsonStr = null;
            } finally{
                if (urlConnection != null) {
                    urlConnection.disconnect();
                }
                if (reader != null) {
                    try {
                        reader.close();
                    } catch (final IOException e) {
                        Log.e("ForecastFragment", "Error closing stream", e);
                    }
                }
            }

            try {
                return getWeatherDataFromJson(forecastJsonStr, Integer.parseInt(params[1]));
            } catch (JSONException e) {
                Log.e(LOG_TAG, e.getMessage(), e);
                e.printStackTrace();
            }

            return null;
        }


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

Java Source Code List

• Back to Weather/sunshine  ↑