6.06 Notifications Quiz

SunshineSyncAdapter.java

    private void notifyWeather() {
        Context context = getContext();
        //checking the last update and notify if it' the first of the day
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
        String lastNotificationKey = context.getString(R.string.pref_last_notification);
        long lastSync = prefs.getLong(lastNotificationKey, 0);

        if (System.currentTimeMillis() - lastSync >= DAY_IN_MILLIS) {
            // Last sync was more than 1 day ago, let's send a notification with the weather.
            String locationQuery = Utility.getPreferredLocation(context);

            Uri weatherUri = WeatherContract.WeatherEntry.buildWeatherLocationWithDate(locationQuery, System.currentTimeMillis());

            // we'll query our contentProvider, as always
            Cursor cursor = context.getContentResolver().query(weatherUri, NOTIFY_WEATHER_PROJECTION, null, null, null);

            if (cursor.moveToFirst()) {
                int weatherId = cursor.getInt(INDEX_WEATHER_ID);
                double high = cursor.getDouble(INDEX_MAX_TEMP);
                double low = cursor.getDouble(INDEX_MIN_TEMP);
                String desc = cursor.getString(INDEX_SHORT_DESC);

                int iconId = Utility.getIconResourceForWeatherCondition(weatherId);
                String title = context.getString(R.string.app_name);

                // Define the text of the forecast.
                String contentText = String.format(context.getString(R.string.format_notification),
                        desc,
                        Utility.formatTemperature(context, high),
                        Utility.formatTemperature(context, low));

                //build your notification here.


                //refreshing last sync
                SharedPreferences.Editor editor = prefs.edit();
                editor.putLong(lastNotificationKey, System.currentTimeMillis());
                editor.commit();
            }
        }

    }

Instead of declaring a variable for SharedPreferences.Editor(), you can string the methods together from an existing SharedPreferences object.
I've forked for you.

prefs.edit()
    .putLong(lastNotificationKey, System.currentTimeMillis())
    .commit();

Shouldn't the cursor returned by ContentResolver.query( ) be closed?

@arthur7257 Yes, it should!

Just a small comment... the line
private static final long DAY_IN_MILLIS = 1000 * 60 * 60 * 24;
can be replaced by convenience static method for getting length of time unit in milliseconds in TimeUnit class:
private final static long DAY_IN_MILLIS = TimeUnit.DAYS.toMillis(1);