--- /dev/null
+package uk.me.njae.sunshine;
+
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.database.Cursor;
+import android.database.DatabaseUtils;
+import android.net.Uri;
+import android.os.AsyncTask;
+import android.preference.PreferenceManager;
+import android.util.Log;
+import android.widget.ArrayAdapter;
+
+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.Date;
+import java.util.Vector;
+
+import uk.me.njae.sunshine.data.WeatherContract;
+import uk.me.njae.sunshine.data.WeatherContract.LocationEntry;
+import uk.me.njae.sunshine.data.WeatherContract.WeatherEntry;
+
+/**
+ * Created by neil on 09/11/14.
+ */
+
+
+public class FetchWeatherTask extends AsyncTask<String, Void, String[]> {
+
+ private final String LOG_TAG = FetchWeatherTask.class.getSimpleName();
+
+ private ArrayAdapter<String> mForecastAdapter;
+ private final Context mContext;
+
+ public FetchWeatherTask(Context context, ArrayAdapter<String> forecastAdapter) {
+ mContext = context;
+ mForecastAdapter = forecastAdapter;
+ }
+
+ private boolean DEBUG = true;
+
+ /* 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) {
+ // Data is fetched in Celsius by default.
+ // If user prefers to see in Fahrenheit, convert the values here.
+ // We do this rather than fetching in Fahrenheit so that the user can
+ // change this option without us having to re-fetch the data once
+ // we start storing the values in a database.
+ SharedPreferences sharedPrefs =
+ PreferenceManager.getDefaultSharedPreferences(mContext);
+ String unitType = sharedPrefs.getString(
+ mContext.getString(R.string.pref_units_key),
+ mContext.getString(R.string.pref_units_metric));
+
+ if (unitType.equals(mContext.getString(R.string.pref_units_imperial))) {
+ high = (high * 1.8) + 32;
+ low = (low * 1.8) + 32;
+ } else if (!unitType.equals(mContext.getString(R.string.pref_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;
+ }
+
+ /**
+ * Helper method to handle insertion of a new location in the weather database.
+ *
+ * @param locationSetting The location string used to request updates from the server.
+ * @param cityName A human-readable city name, e.g "Mountain View"
+ * @param lat the latitude of the city
+ * @param lon the longitude of the city
+ * @return the row ID of the added location.
+ */
+ private long addLocation(String locationSetting, String cityName, double lat, double lon) {
+
+ Log.v(LOG_TAG, "inserting " + cityName + ", with coord: " + lat + ", " + lon);
+
+ // First, check if the location with this city name exists in the db
+ Cursor cursor = mContext.getContentResolver().query(
+ LocationEntry.CONTENT_URI,
+ new String[]{LocationEntry._ID},
+ LocationEntry.COLUMN_LOCATION_SETTING + " = ?",
+ new String[]{locationSetting},
+ null);
+
+ if (cursor.moveToFirst()) {
+ Log.v(LOG_TAG, "Found it in the database!");
+ int locationIdIndex = cursor.getColumnIndex(LocationEntry._ID);
+ return cursor.getLong(locationIdIndex);
+ } else {
+ Log.v(LOG_TAG, "Didn't find it in the database, inserting now!");
+ ContentValues locationValues = new ContentValues();
+ locationValues.put(LocationEntry.COLUMN_LOCATION_SETTING, locationSetting);
+ locationValues.put(LocationEntry.COLUMN_CITY_NAME, cityName);
+ locationValues.put(LocationEntry.COLUMN_COORD_LAT, lat);
+ locationValues.put(LocationEntry.COLUMN_COORD_LONG, lon);
+
+ Uri locationInsertUri = mContext.getContentResolver()
+ .insert(LocationEntry.CONTENT_URI, locationValues);
+
+ return ContentUris.parseId(locationInsertUri);
+ }
+ }
+
+ /**
+ * 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.
+ * <p/>
+ * 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,
+ String locationSetting)
+ throws JSONException {
+
+ // These are the names of the JSON objects that need to be extracted.
+
+ // Location information
+ final String OWM_CITY = "city";
+ final String OWM_CITY_NAME = "name";
+ final String OWM_COORD = "coord";
+ final String OWM_COORD_LAT = "lat";
+ final String OWM_COORD_LONG = "lon";
+
+ // Weather information. Each day's forecast info is an element of the "list" array.
+ final String OWM_LIST = "list";
+
+ final String OWM_DATETIME = "dt";
+ final String OWM_PRESSURE = "pressure";
+ final String OWM_HUMIDITY = "humidity";
+ final String OWM_WINDSPEED = "speed";
+ final String OWM_WIND_DIRECTION = "deg";
+
+ // All temperatures are children of the "temp" object.
+ final String OWM_TEMPERATURE = "temp";
+ final String OWM_MAX = "max";
+ final String OWM_MIN = "min";
+
+ final String OWM_WEATHER = "weather";
+ final String OWM_DESCRIPTION = "main";
+ final String OWM_WEATHER_ID = "id";
+
+ JSONObject forecastJson = new JSONObject(forecastJsonStr);
+ JSONArray weatherArray = forecastJson.getJSONArray(OWM_LIST);
+
+ JSONObject cityJson = forecastJson.getJSONObject(OWM_CITY);
+ String cityName = cityJson.getString(OWM_CITY_NAME);
+ JSONObject coordJSON = cityJson.getJSONObject(OWM_COORD);
+ double cityLatitude = coordJSON.getLong(OWM_COORD_LAT);
+ double cityLongitude = coordJSON.getLong(OWM_COORD_LONG);
+
+ Log.v(LOG_TAG, cityName + ", with coord: " + cityLatitude + " " + cityLongitude);
+
+ // Insert the location into the database.
+ long locationID = addLocation(locationSetting, cityName, cityLatitude, cityLongitude);
+
+ // Get and insert the new weather information into the database
+ Vector<ContentValues> cVVector = new Vector<ContentValues>(weatherArray.length());
+
+ String[] resultStrs = new String[numDays];
+ for (int i = 0; i < weatherArray.length(); i++) {
+ // These are the values that will be collected.
+
+ long dateTime;
+ double pressure;
+ int humidity;
+ double windSpeed;
+ double windDirection;
+
+ double high;
+ double low;
+
+ String description;
+ int weatherId;
+
+ // 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".
+ dateTime = dayForecast.getLong(OWM_DATETIME);
+
+ pressure = dayForecast.getDouble(OWM_PRESSURE);
+ humidity = dayForecast.getInt(OWM_HUMIDITY);
+ windSpeed = dayForecast.getDouble(OWM_WINDSPEED);
+ windDirection = dayForecast.getDouble(OWM_WIND_DIRECTION);
+
+ // Description is in a child array called "weather", which is 1 element long.
+ // That element also contains a weather code.
+ JSONObject weatherObject =
+ dayForecast.getJSONArray(OWM_WEATHER).getJSONObject(0);
+ description = weatherObject.getString(OWM_DESCRIPTION);
+ weatherId = weatherObject.getInt(OWM_WEATHER_ID);
+
+ // 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);
+ high = temperatureObject.getDouble(OWM_MAX);
+ low = temperatureObject.getDouble(OWM_MIN);
+
+ ContentValues weatherValues = new ContentValues();
+
+ weatherValues.put(WeatherEntry.COLUMN_LOC_KEY, locationID);
+ weatherValues.put(WeatherEntry.COLUMN_DATETEXT,
+ WeatherContract.getDbDateString(new Date(dateTime * 1000L)));
+ weatherValues.put(WeatherEntry.COLUMN_HUMIDITY, humidity);
+ weatherValues.put(WeatherEntry.COLUMN_PRESSURE, pressure);
+ weatherValues.put(WeatherEntry.COLUMN_WIND_SPEED, windSpeed);
+ weatherValues.put(WeatherEntry.COLUMN_DEGREES, windDirection);
+ weatherValues.put(WeatherEntry.COLUMN_MAX_TEMP, high);
+ weatherValues.put(WeatherEntry.COLUMN_MIN_TEMP, low);
+ weatherValues.put(WeatherEntry.COLUMN_SHORT_DESC, description);
+ weatherValues.put(WeatherEntry.COLUMN_WEATHER_ID, weatherId);
+
+ cVVector.add(weatherValues);
+
+ String highAndLow = formatHighLows(high, low);
+ String day = getReadableDateString(dateTime);
+ resultStrs[i] = day + " - " + description + " - " + highAndLow;
+ }
+ if (cVVector.size() > 0) {
+ ContentValues[] cvArray = new ContentValues[cVVector.size()];
+ cVVector.toArray(cvArray);
+ int rowsInserted = mContext.getContentResolver()
+ .bulkInsert(WeatherEntry.CONTENT_URI, cvArray);
+ Log.v(LOG_TAG, "inserted " + rowsInserted + " rows of weather data");
+ // Use a DEBUG variable to gate whether or not you do this, so you can easily
+ // turn it on and off, and so that it's easy to see what you can rip out if
+ // you ever want to remove it.
+ if (DEBUG) {
+ Cursor weatherCursor = mContext.getContentResolver().query(
+ WeatherEntry.CONTENT_URI,
+ null,
+ null,
+ null,
+ null
+ );
+
+ if (weatherCursor.moveToFirst()) {
+ ContentValues resultValues = new ContentValues();
+ DatabaseUtils.cursorRowToContentValues(weatherCursor, resultValues);
+ Log.v(LOG_TAG, "Query succeeded! **********");
+ for (String key : resultValues.keySet()) {
+ Log.v(LOG_TAG, key + ": " + resultValues.getAsString(key));
+ }
+ } else {
+ Log.v(LOG_TAG, "Query failed! :( **********");
+ }
+ }
+ }
+ return resultStrs;
+ }
+
+ @Override
+ protected String[] doInBackground(String... params) {
+
+ // If there's no zip code, there's nothing to look up. Verify size of params.
+ if (params.length == 0) {
+ return null;
+ }
+ String locationQuery = params[0];
+
+ // 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 numDays = 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
+ final String FORECAST_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(FORECAST_BASE_URL).buildUpon()
+ .appendQueryParameter(QUERY_PARAM, params[0])
+ .appendQueryParameter(FORMAT_PARAM, format)
+ .appendQueryParameter(UNITS_PARAM, units)
+ .appendQueryParameter(DAYS_PARAM, Integer.toString(numDays))
+ .build();
+
+ 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.
+ return 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.
+ return null;
+ }
+ forecastJsonStr = buffer.toString();
+ } catch (IOException e) {
+ Log.e(LOG_TAG, "Error ", e);
+ // If the code didn't successfully get the weather data, there's no point in attemping
+ // to parse it.
+ return 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, numDays, locationQuery);
+ } catch (JSONException e) {
+ Log.e(LOG_TAG, e.getMessage(), e);
+ e.printStackTrace();
+ }
+ // This will only happen if there was an error getting or parsing the forecast.
+ return null;
+ }
+
+ @Override
+ protected void onPostExecute(String[] result) {
+ if (result != null) {
+ mForecastAdapter.clear();
+ for (String dayForecastStr : result) {
+ mForecastAdapter.add(dayForecastStr);
+ }
+ // New data is back from the server. Hooray!
+ }
+ }
+
+}
\ No newline at end of file
projects / Sunshine.git / blobdiff