如何在安卓中获取一个地方的时区

Question

我在时区显示方面遇到问题。我需要显示时区和时间，例如"12/11/2014 11：45 IST"。我可以显示时间。但我无法显示哪个地方是PST, EST或IST的区域。我该怎么做？有人可以帮助我吗？

我的源代码很糟糕。

    Calendar c = Calendar.getInstance();
    year = c.get(Calendar.YEAR);
    month = c.get(Calendar.MONTH);
    day = c.get(Calendar.DAY_OF_MONTH);
    hour = c.get(Calendar.HOUR_OF_DAY);
    minute = c.get(Calendar.MINUTE);

Answer 1

 public static String TimezoneUrl = "https://maps.googleapis.com/maps/api/timezone/json?";
 API_KEY="Your API service key";
 newurl = TimezoneUrl+"location="+myLatitude+","
 +myLongitude+"&timestamp="+System.currentTimeMillis() / 1000 + "&key=" + API_KEY;
 response = makeServiceCall(url, ServiceHandler.GET);
 jsonResponse = new JSONObject(response);
 timesone = jsonResponse.getString("timeZoneName");

 for (int i = 0; i < timesone.length(); i++) {
        if (Character.isUpperCase(timesone.charAt(i))) {
            char c = timesone.charAt(i);
            timezone = timezone + c;
    }
 }
  public String makeServiceCall(String url, int method) {
    return this.makeServiceCall(url, method, null);
 }

 public String makeServiceCall(String url, int method,
    List<NameValuePair> params) {
 try {
    // http client
    DefaultHttpClient httpClient = new DefaultHttpClient();
    //httpClient.getParams().setParameter(CoreProtocolPNames.USER_AGENT, "Custom user agent");
    HttpEntity httpEntity = null;
    HttpResponse httpResponse = null;
    // Checking http request method type
     if (method == GET) {
        // appending params to url
        if (params != null) {
            String paramString = URLEncodedUtils    .format(params, "utf-8");
            url += "?" + paramString;
        }
        HttpGet httpGet = new HttpGet(url);
        httpResponse = httpClient.execute(httpGet);
    }
    httpEntity = httpResponse.getEntity();
    response = EntityUtils.toString(httpEntity);
} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
} catch (ClientProtocolException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}
return response;
}

结果将为您提供预期的时区。

Answer 2

你是否使用TimeZone.getDefault（）：大多数应用程序将使用 TimeZone.getDefault（），它根据程序运行的时区返回时区。

更多信息： http://developer.android.com/reference/java/util/TimeZone.html

也试试下面的代码：

TimeZone tz = TimeZone.getDefault();
System.out.println("TimeZone   "+tz.getDisplayName(false, TimeZone.SHORT)+" Timezon id :: " tz.getID());

Answer 3

您可以使用

SimpleDateFormat 以简单的方式使用 TimeZone 格式化Date。例如，要将日期显示为12/11/2014 11:45 IST TimeZone，您可以使用如下所示dd/MM/yyyy HH:mm z格式，其中z将表示TimeZone，如下所示EST, IST。

Calendar cal = Calendar.getInstance();
SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy HH:mm z");
String formatedDate = dateFormat.format(cal.getTime());

Answer 4

public static String getPSTDate() {
        String returnFormat = "";
        try {
            Date startTime = new Date();
            TimeZone pstTimeZone = TimeZone.getTimeZone("America/Los_Angeles");
            DateFormat formatter = DateFormat.getDateInstance();
            formatter.setTimeZone(pstTimeZone);
            returnFormat = formatter.format(startTime);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return returnFormat;
    }
    public static String getPSTime() {
        String returnFormat = "";
        try {
            Date startTime = new Date();
            TimeZone pstTimeZone = TimeZone.getTimeZone("America/Los_Angeles");
            DateFormat formatter = DateFormat.getTimeInstance();
            formatter.setTimeZone(pstTimeZone);
            returnFormat = formatter.format(startTime);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return returnFormat;
    }

Answer 5

下面是一个示例，说明如何确定应用程序的时间与系统时区位于不同的时区。如果是 - 打开时间设置

TimeZone.setDefault(null) // clear cached timezone
val localeCountry = Locale.getDefault().country // get default country 
code
val availableTimeZoneList = TimeZone.getAvailableIDs(localeCountry).toList() // available time zone list for default country code
val currentTimeZone = TimeZone.getDefault()
if(!availableTimeZoneList.contains(currentTimeZone.id) && availableTimeZoneList.all { TimeZone.getTimeZone(it).rawOffset != currentTimeZone.rawOffset }) {
    startActivity(Intent(android.provider.Settings.ACTION_DATE_SETTINGS))
}