app/src/main/java/uk/me/njae/sunshine/ForecastFragment.java

   1 package uk.me.njae.sunshine;
   2
   3 import android.content.Intent;
   4 import android.net.Uri;
   5 import android.os.AsyncTask;
   6 import android.os.Bundle;
   7 import android.support.v4.app.Fragment;
   8 import android.util.Log;
   9 import android.view.LayoutInflater;
  10 import android.view.Menu;
  11 import android.view.MenuInflater;
  12 import android.view.MenuItem;
  13 import android.view.View;
  14 import android.view.ViewGroup;
  15 import android.widget.AdapterView;
  16 import android.widget.ArrayAdapter;
  17 import android.widget.ListView;
  18 import android.widget.Toast;
  19
  20 import org.json.JSONArray;
  21 import org.json.JSONException;
  22 import org.json.JSONObject;
  23
  24 import java.io.BufferedReader;
  25 import java.io.IOException;
  26 import java.io.InputStream;
  27 import java.io.InputStreamReader;
  28 import java.net.HttpURLConnection;
  29 import java.net.URL;
  30 import java.text.SimpleDateFormat;
  31 import java.util.ArrayList;
  32 import java.util.Arrays;
  33 import java.util.Date;
  34 import java.util.List;
  35
  36 /**
  37  * A placeholder fragment containing a simple view.
  38  */
  39 public class ForecastFragment extends Fragment {
  40
  41     private ArrayAdapter<String> mForecastAdapter;
  42
  43     public ForecastFragment() {
  44     }
  45
  46     @Override
  47     public void onCreate(Bundle savedInstanceState) {
  48         super.onCreate(savedInstanceState);
  49         setHasOptionsMenu(true);
  50     }
  51
  52     @Override
  53     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
  54         // Inflate the menu; this adds items to the action bar if it is present.
  55         inflater.inflate(R.menu.forecastfragment, menu);
  56     }
  57
  58     @Override
  59     public boolean onOptionsItemSelected(MenuItem item) {
  60         // Handle action bar item clicks here. The action bar will
  61         // automatically handle clicks on the Home/Up button, so long
  62         // as you specify a parent activity in AndroidManifest.xml.
  63         int id = item.getItemId();
  64         if (id == R.id.action_refresh) {
  65             FetchWeatherTask weatherTask = new FetchWeatherTask();
  66             weatherTask.execute("2642465");
  67             return true;
  68         }
  69         return super.onOptionsItemSelected(item);
  70     }
  71
  72     @Override
  73     public View onCreateView(LayoutInflater inflater, ViewGroup container,
  74                              Bundle savedInstanceState) {
  75
  76         String[] forecastArray = {
  77                 "Today - Sunny - 10/10",
  78                 "Tomorrow - Cloudy - 11/11",
  79                 "Tuesday - Snow - 12/12",
  80                 "Wednesday - Rain - 13/13",
  81                 "Thursday - Hail - 14/14",
  82                 "Friday - Scorchio - 15/15",
  83                 "Saturday - Fog - 16/16"
  84         };
  85
  86         List<String> weekForecast = new ArrayList<String>(
  87                 Arrays.asList(forecastArray));
  88         mForecastAdapter = new ArrayAdapter<String>(
  89                 getActivity(),
  90                 R.layout.list_item_forecast,
  91                 R.id.list_item_forecast_textview,
  92                 weekForecast
  93         );
  94
  95         View rootView = inflater.inflate(R.layout.fragment_main, container, false);
  96
  97         ListView listView = (ListView) rootView.findViewById(R.id.listview_forecast);
  98         listView.setAdapter(mForecastAdapter);
  99         listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
 100             @Override
 101             public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
 102                 String forecast = mForecastAdapter.getItem(position);
 103                 Intent intent = new Intent(getActivity(), DetailActivity.class)
 104                         .putExtra(Intent.EXTRA_TEXT, forecast);
 105                 startActivity(intent);
 106             }
 107         });
 108
 109         return rootView;
 110     }
 111
 112     public class FetchWeatherTask extends AsyncTask<String, Void, String[]> {
 113
 114         private final String LOG_TAG = FetchWeatherTask.class.getSimpleName();
 115
 116         @Override
 117         protected void onPostExecute(String[] result) {
 118             if (result != null) {
 119                 mForecastAdapter.clear();
 120 //                for (String dayForecastStr: result) {
 121 //                    mForecastAdapter.add(dayForecastStr);
 122 //                }
 123                 mForecastAdapter.addAll(result);
 124             }
 125         }
 126
 127         @Override
 128         protected String[] doInBackground(String... params) {
 129             if (params.length == 0) {
 130                 return null;
 131             }
 132
 133             // These two need to be declared outside the try/catch
 134             // so that they can be closed in the finally block.
 135             HttpURLConnection urlConnection = null;
 136             BufferedReader reader = null;
 137
 138             // Will contain the raw JSON response as a string.
 139             String forecastJsonStr;
 140
 141             String format = "json";
 142             String units = "metric";
 143             int numDays = 7;
 144
 145             try {
 146                 // Construct the URL for the OpenWeatherMap query
 147                 // Possible parameters are avaiable at OWM's forecast API page, at
 148                 // http://openweathermap.org/API#forecast
 149                 final String FORECAST_BASE_URL = "http://api.openweathermap.org/data/2.5/forecast/daily?";
 150                 final String QUERY_PARAM = "id";
 151                 final String FORMAT_PARAM = "mode";
 152                 final String UNITS_PARAM = "units";
 153                 final String DAYS_PARAM = "cnt";
 154
 155                 Uri builtUri = Uri.parse(FORECAST_BASE_URL).buildUpon()
 156                         .appendQueryParameter(QUERY_PARAM, params[0])
 157                         .appendQueryParameter(FORMAT_PARAM, format)
 158                         .appendQueryParameter(UNITS_PARAM, units)
 159                         .appendQueryParameter(DAYS_PARAM, Integer.toString(numDays))
 160                         .build();
 161
 162                 URL url = new URL(builtUri.toString());
 163 /**/                Log.v(LOG_TAG, "Built URI " + builtUri.toString());
 164
 165                 // Create the request to OpenWeatherMap, and open the connection
 166                 urlConnection = (HttpURLConnection) url.openConnection();
 167                 urlConnection.setRequestMethod("GET");
 168                 urlConnection.connect();
 169
 170                 // Read the input stream into a String
 171                 InputStream inputStream = urlConnection.getInputStream();
 172                 StringBuffer buffer = new StringBuffer();
 173                 if (inputStream == null) {
 174                     // Nothing to do.
 175                     return null;
 176                 }
 177                 reader = new BufferedReader(new InputStreamReader(inputStream));
 178
 179                 String line;
 180                 while ((line = reader.readLine()) != null) {
 181                     // Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
 182                     // But it does make debugging a *lot* easier if you print out the completed
 183                     // buffer for debugging.
 184                     buffer.append(line + "\n");
 185                 }
 186
 187                 if (buffer.length() == 0) {
 188                     // Stream was empty.  No point in parsing.
 189                     return null;
 190                 }
 191                 forecastJsonStr = buffer.toString();
 192 //                Log.v(LOG_TAG, "Forecast JSON string: " + forecastJsonStr);
 193                 try {
 194                     return getWeatherDataFromJson(forecastJsonStr, numDays);
 195                 } catch (JSONException e) {
 196                     Log.e(LOG_TAG, e.getMessage(), e);
 197                     e.printStackTrace();
 198                 }
 199
 200                 // This will only happen if we fail to read the forecast
 201                 return null;
 202
 203             } catch (IOException e) {
 204                 Log.e(LOG_TAG, "Error ", e);
 205                 // If the code didn't successfully get the weather data, there's no point in attempting
 206                 // to parse it.
 207                 forecastJsonStr = null;
 208             } finally {
 209                 if (urlConnection != null) {
 210                     urlConnection.disconnect();
 211                 }
 212                 if (reader != null) {
 213                     try {
 214                         reader.close();
 215                     } catch (final IOException e) {
 216                         Log.e(LOG_TAG, "Error closing stream", e);
 217                     }
 218                 }
 219             }
 220             return null;
 221         }
 222
 223         /* The date/time conversion code is going to be moved outside the asynctask later,
 224          * so for convenience we're breaking it out into its own method now.
 225          */
 226         private String getReadableDateString(long time) {
 227             // Because the API returns a unix timestamp (measured in seconds),
 228             // it must be converted to milliseconds in order to be converted to valid date.
 229             Date date = new Date(time * 1000);
 230             SimpleDateFormat format = new SimpleDateFormat("E, MMM d");
 231             return format.format(date).toString();
 232         }
 233
 234         /**
 235          * Prepare the weather high/lows for presentation.
 236          */
 237         private String formatHighLows(double high, double low) {
 238             // For presentation, assume the user doesn't care about tenths of a degree.
 239             long roundedHigh = Math.round(high);
 240             long roundedLow = Math.round(low);
 241
 242             String highLowStr = roundedHigh + "/" + roundedLow;
 243             return highLowStr;
 244         }
 245
 246         /**
 247          * Take the String representing the complete forecast in JSON Format and
 248          * pull out the data we need to construct the Strings needed for the wireframes.
 249          * <p/>
 250          * Fortunately parsing is easy:  constructor takes the JSON string and converts it
 251          * into an Object hierarchy for us.
 252          */
 253         private String[] getWeatherDataFromJson(String forecastJsonStr, int numDays)
 254                 throws JSONException {
 255
 256             // These are the names of the JSON objects that need to be extracted.
 257             final String OWM_LIST = "list";
 258             final String OWM_WEATHER = "weather";
 259             final String OWM_TEMPERATURE = "temp";
 260             final String OWM_MAX = "max";
 261             final String OWM_MIN = "min";
 262             final String OWM_DATETIME = "dt";
 263             final String OWM_DESCRIPTION = "main";
 264
 265             JSONObject forecastJson = new JSONObject(forecastJsonStr);
 266             JSONArray weatherArray = forecastJson.getJSONArray(OWM_LIST);
 267
 268             String[] resultStrs = new String[numDays];
 269             for (int i = 0; i < weatherArray.length(); i++) {
 270                 // For now, using the format "Day, description, hi/low"
 271                 String day;
 272                 String description;
 273                 String highAndLow;
 274
 275                 // Get the JSON object representing the day
 276                 JSONObject dayForecast = weatherArray.getJSONObject(i);
 277
 278                 // The date/time is returned as a long.  We need to convert that
 279                 // into something human-readable, since most people won't read "1400356800" as
 280                 // "this saturday".
 281                 long dateTime = dayForecast.getLong(OWM_DATETIME);
 282                 day = getReadableDateString(dateTime);
 283
 284                 // description is in a child array called "weather", which is 1 element long.
 285                 JSONObject weatherObject = dayForecast.getJSONArray(OWM_WEATHER).getJSONObject(0);
 286                 description = weatherObject.getString(OWM_DESCRIPTION);
 287
 288                 // Temperatures are in a child object called "temp".  Try not to name variables
 289                 // "temp" when working with temperature.  It confuses everybody.
 290                 JSONObject temperatureObject = dayForecast.getJSONObject(OWM_TEMPERATURE);
 291                 double high = temperatureObject.getDouble(OWM_MAX);
 292                 double low = temperatureObject.getDouble(OWM_MIN);
 293
 294                 highAndLow = formatHighLows(high, low);
 295                 resultStrs[i] = day + " - " + description + " - " + highAndLow;
 296             }
 297
 298 //            for (String s: resultStrs) {
 299 //                Log.v(LOG_TAG, "Forecast entry: " + s);
 300 //            }
 301             return resultStrs;
 302         }
 303     }
 304 }