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我正在使用udacity的sunshine應用程序項目製作天氣應用程序，它根據用戶的當前位置更新天氣。我想將當前位置設置爲默認值，讓用戶在首選項中進行更改，如果用戶在首選項中沒有更改位置，它會默認檢測位置並進行設置。我正在使用位置管理器並在首選項中設置默認值。問題都有不同的範圍。這是代碼段的預測。訪問覆蓋函數中的變量並在其他函數中使用
public static String getPreferredLocation(Context context) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
return prefs.getString(context.getString(R.string.pref_location_key),
context.getString(R.string.pref_location_default));
}
而這正是我使用LocationListener的獲取當前城市名稱
public void onLocationChanged(Location loc) {
String longitude = "Longitude: " + loc.getLongitude();
Log.v(TAG, longitude);
String latitude = "Latitude: " + loc.getLatitude();
Log.v(TAG, latitude);
String cityName = null;
Geocoder gcd = new Geocoder(getBaseContext(), Locale.getDefault());
List<Address> addresses;
try {
addresses = gcd.getFromLocation(loc.getLatitude(),
loc.getLongitude(), 1);
if (addresses.size() > 0) {
System.out.println(addresses.get(0).getLocality());
cityName = addresses.get(0).getLocality();
}
}
catch (IOException e) {
e.printStackTrace();
}
}
我想cityname.But更換pref_location_default我無法訪問onLoctionChanged function.I外城市名不能在優先級位置默認情況下使用它們。所有這些都在同一個類中實現，這裏是類的完整代碼。
Utility.java
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.text.format.Time;
import android.util.Log;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import static android.content.ContentValues.TAG;
public class Utility extends Activity implements LocationListener {
public static final String DATE_FORMAT = "yyyyMMdd";
public static String getPreferredLocation(Context context) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
return prefs.getString(context.getString(R.string.pref_location_key),
context.getString(R.string.pref_location_default));
}
public static boolean isMetric(Context context) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
return prefs.getString(context.getString(R.string.pref_units_key),
context.getString(R.string.pref_units_metric))
.equals(context.getString(R.string.pref_units_metric));
}
public static String formatTemperature(Context context, double temperature) {
// Data stored in Celsius by default. If user prefers to see in Fahrenheit, convert
// the values here.
String suffix = "\u00B0";
if (!isMetric(context)) {
temperature = (temperature * 1.8) + 32;
}
// For presentation, assume the user doesn't care about tenths of a degree.
return String.format(context.getString(R.string.format_temperature), temperature);
}
static String formatDate(long dateInMilliseconds) {
Date date = new Date(dateInMilliseconds);
return DateFormat.getDateInstance().format(date);
}
/**
* Helper method to convert the database representation of the date into something to display
* to users. As classy and polished a user experience as "20140102" is, we can do better.
*
* @param context Context to use for resource localization
* @param dateInMillis The date in milliseconds
* @return a user-friendly representation of the date.
*/
public static String getFriendlyDayString(Context context, long dateInMillis) {
// The day string for forecast uses the following logic:
// For today: "Today, June 8"
// For tomorrow: "Tomorrow"
// For the next 5 days: "Wednesday" (just the day name)
// For all days after that: "Mon Jun 8"
Time time = new Time();
time.setToNow();
long currentTime = System.currentTimeMillis();
int julianDay = Time.getJulianDay(dateInMillis, time.gmtoff);
int currentJulianDay = Time.getJulianDay(currentTime, time.gmtoff);
// If the date we're building the String for is today's date, the format
// is "Today, June 24"
if (julianDay == currentJulianDay) {
String today = context.getString(R.string.today);
int formatId = R.string.format_full_friendly_date;
return String.format(context.getString(
formatId,
today,
getFormattedMonthDay(context, dateInMillis)));
} else if (julianDay < currentJulianDay + 7) {
// If the input date is less than a week in the future, just return the day name.
return getDayName(context, dateInMillis);
} else {
// Otherwise, use the form "Mon Jun 3"
SimpleDateFormat shortenedDateFormat = new SimpleDateFormat("EEE MMM dd");
return shortenedDateFormat.format(dateInMillis);
}
}
/**
* Given a day, returns just the name to use for that day.
* E.g "today", "tomorrow", "wednesday".
*
* @param context Context to use for resource localization
* @param dateInMillis The date in milliseconds
* @return
*/
public static String getDayName(Context context, long dateInMillis) {
// If the date is today, return the localized version of "Today" instead of the actual
// day name.
Time t = new Time();
t.setToNow();
int julianDay = Time.getJulianDay(dateInMillis, t.gmtoff);
int currentJulianDay = Time.getJulianDay(System.currentTimeMillis(), t.gmtoff);
if (julianDay == currentJulianDay) {
return context.getString(R.string.today);
} else if (julianDay == currentJulianDay + 1) {
return context.getString(R.string.tomorrow);
} else {
Time time = new Time();
time.setToNow();
// Otherwise, the format is just the day of the week (e.g "Wednesday".
SimpleDateFormat dayFormat = new SimpleDateFormat("EEEE");
return dayFormat.format(dateInMillis);
}
}
/**
* Converts db date format to the format "Month day", e.g "June 24".
*
* @param context Context to use for resource localization
* @param dateInMillis The db formatted date string, expected to be of the form specified
* in Utility.DATE_FORMAT
* @return The day in the form of a string formatted "December 6"
*/
public static String getFormattedMonthDay(Context context, long dateInMillis) {
Time time = new Time();
time.setToNow();
SimpleDateFormat dbDateFormat = new SimpleDateFormat(Utility.DATE_FORMAT);
SimpleDateFormat monthDayFormat = new SimpleDateFormat("MMMM dd");
String monthDayString = monthDayFormat.format(dateInMillis);
return monthDayString;
}
public static String getFormattedWind(Context context, float windSpeed, float degrees) {
int windFormat;
if (Utility.isMetric(context)) {
windFormat = R.string.format_wind_kmh;
} else {
windFormat = R.string.format_wind_mph;
windSpeed = .621371192237334f * windSpeed;
}
// From wind direction in degrees, determine compass direction as a string (e.g NW)
// You know what's fun, writing really long if/else statements with tons of possible
// conditions. Seriously, try it!
String direction = "Unknown";
if (degrees >= 337.5 || degrees < 22.5) {
direction = "N";
} else if (degrees >= 22.5 && degrees < 67.5) {
direction = "NE";
} else if (degrees >= 67.5 && degrees < 112.5) {
direction = "E";
} else if (degrees >= 112.5 && degrees < 157.5) {
direction = "SE";
} else if (degrees >= 157.5 && degrees < 202.5) {
direction = "S";
} else if (degrees >= 202.5 && degrees < 247.5) {
direction = "SW";
} else if (degrees >= 247.5 && degrees < 292.5) {
direction = "W";
} else if (degrees >= 292.5 && degrees < 337.5) {
direction = "NW";
}
return String.format(context.getString(windFormat), windSpeed, direction);
}
/**
* Helper method to provide the icon resource id according to the weather condition id returned
* by the OpenWeatherMap call.
*
* @param weatherId from OpenWeatherMap API response
* @return resource id for the corresponding icon. -1 if no relation is found.
*/
public static int getIconResourceForWeatherCondition(int weatherId) {
// Based on weather code data found at:
// http://bugs.openweathermap.org/projects/api/wiki/Weather_Condition_Codes
if (weatherId >= 200 && weatherId <= 232) {
return R.drawable.ic_storm;
} else if (weatherId >= 300 && weatherId <= 321) {
return R.drawable.ic_light_rain;
} else if (weatherId >= 500 && weatherId <= 504) {
return R.drawable.ic_rain;
} else if (weatherId == 511) {
return R.drawable.ic_snow;
} else if (weatherId >= 520 && weatherId <= 531) {
return R.drawable.ic_rain;
} else if (weatherId >= 600 && weatherId <= 622) {
return R.drawable.ic_snow;
} else if (weatherId >= 701 && weatherId <= 761) {
return R.drawable.ic_fog;
} else if (weatherId == 761 || weatherId == 781) {
return R.drawable.ic_storm;
} else if (weatherId == 800) {
return R.drawable.ic_clear;
} else if (weatherId == 801) {
return R.drawable.ic_light_clouds;
} else if (weatherId >= 802 && weatherId <= 804) {
return R.drawable.ic_cloudy;
}
return -1;
}
/**
* Helper method to provide the art resource id according to the weather condition id returned
* by the OpenWeatherMap call.
*
* @param weatherId from OpenWeatherMap API response
* @return resource id for the corresponding icon. -1 if no relation is found.
*/
public static int getArtResourceForWeatherCondition(int weatherId) {
// Based on weather code data found at:
// http://bugs.openweathermap.org/projects/api/wiki/Weather_Condition_Codes
if (weatherId >= 200 && weatherId <= 232) {
return R.drawable.art_storm;
} else if (weatherId >= 300 && weatherId <= 321) {
return R.drawable.art_light_rain;
} else if (weatherId >= 500 && weatherId <= 504) {
return R.drawable.art_rain;
} else if (weatherId == 511) {
return R.drawable.art_snow;
} else if (weatherId >= 520 && weatherId <= 531) {
return R.drawable.art_rain;
} else if (weatherId >= 600 && weatherId <= 622) {
return R.drawable.art_snow;
} else if (weatherId >= 701 && weatherId <= 761) {
return R.drawable.art_fog;
} else if (weatherId == 761 || weatherId == 781) {
return R.drawable.art_storm;
} else if (weatherId == 800) {
return R.drawable.art_clear;
} else if (weatherId == 801) {
return R.drawable.art_light_clouds;
} else if (weatherId >= 802 && weatherId <= 804) {
return R.drawable.art_clouds;
}
return -1;
}
/**
* Helper method to provide the art resource id according to the weather condition id returned
* by the OpenWeatherMap call.
*
* @param weatherId from OpenWeatherMap API response
* @return resource id for the corresponding icon. -1 if no relation is found.
*/
public static int getColorRessourceForWeatherCondition(int weatherId) {
// Based on weather code data found at:
// http://bugs.openweathermap.org/projects/api/wiki/Weather_Condition_Codes
return -1;
}
@Override
public void onLocationChanged(Location loc) {
String longitude = "Longitude: " + loc.getLongitude();
Log.v(TAG, longitude);
String latitude = "Latitude: " + loc.getLatitude();
Log.v(TAG, latitude);
String cityName = null;
Geocoder gcd = new Geocoder(getBaseContext(), Locale.getDefault());
List<Address> addresses;
try {
addresses = gcd.getFromLocation(loc.getLatitude(),
loc.getLongitude(), 1);
if (addresses.size() > 0) {
System.out.println(addresses.get(0).getLocality());
cityName = addresses.get(0).getLocality();
}
}
catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
}