Android: Samsung Galaxy Tabs и устройства Android 2.2 Отображение даты GPS на 1 день вперед с 1 января 2012 г.

У меня есть 7-дюймовый Galaxy tab GT-P1000 с версией прошивки 2.3.3 и телефоны под управлением Android 2.2. В обеих версиях, когда я когда-либо пытался получить время от GPS, он показывает на 1 день опережение с 1 января 2012 года. Один и тот же код отлично работает на телефонах Samsung, LG и Motorola.

Пример кода для приложения:

package com.vxceed.dateTime;


import java.util.Calendar;

import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

public class SampleDateTimeActivity extends Activity {

    private LocationManager locationManager;
    private  TextView tv;
    String varTime="";

    /**
     * Location Listener 
     */
    LocationListener locationListener = new LocationListener() {

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {

        }

        @Override
        public void onProviderEnabled(String provider) {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
        }

        @Override
        public void onProviderDisabled(String provider) {
            Toast.makeText(SampleDateTimeActivity.this,"GPS off", Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onLocationChanged(Location location) {
            setCurrentLocation(location);

        }
    };



    private void setCurrentLocation(Location location) {

          varTime=String.valueOf(location.getTime());

    }


    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        locationManager=(LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,0, locationListener);

         tv=(TextView)findViewById(R.id.textView1);

    }


     public void refreshTime(View v)
     {
        String currentGPSTime="";
        currentGPSTime=varTime;
        if(currentGPSTime.compareTo("")==0)
        {
            tv.setText("Time Not Available");
        }
        else
        {
            Calendar cal=Calendar.getInstance();
            cal.setTimeInMillis(new Long(currentGPSTime));

            long currentDeviceTime=Calendar.getInstance().getTimeInMillis();

            Calendar cal2=Calendar.getInstance();
            cal2.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DATE)-1,cal.get(Calendar.HOUR_OF_DAY),cal.get(Calendar.MINUTE));
            long currentGPSTime_less_one_Day=cal2.getTimeInMillis();

            tv.setText( "GPSTIME:"+cal.getTime().toString() +" \n GPS_TIME_in_Millis:"+varTime+"\nDevice_Time_in_millis:"+String.valueOf(currentDeviceTime) +"\nGPS Time -1 day:"+String.valueOf(currentGPSTime_less_one_Day));
        }
     }


    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        if (locationManager != null && locationListener != null){
            locationManager.removeUpdates(locationListener);
            locationManager = null;
        }
    }


}

Я поискал в Google, а затем, обратившись к официальному документу NMEA, выяснил, как использовать данные NMEA. Вот рабочий код для слушателя NMEA:

NmeaListener nmeaListener = new NmeaListener() {

        @Override
        public void onNmeaReceived(long timestamp, String nmea) {

            parse(nmea);
        }
    };


    private boolean parse(String strNMEA) {

        // Discard the sentence if its checksum does not match our calculated
        // checksum
        boolean bStatus = false;
        try {
            if (!IsValid(strNMEA)) {

                return false;
            }
            String[] sArrNMEA = strNMEA.split(",");
            String strNMEAType = sArrNMEA[0];
            if (strNMEAType.equals("$GPRMC")) {

                bStatus = ParseGPRMC(sArrNMEA);
            } else {

                bStatus = false;
            }

            sArrNMEA = null;
        } catch (Exception e) {

        }
        return bStatus;

    }

    private boolean ParseGPRMC(String[] sArrNMEA) {

        boolean result = false;
        try {
            if (sArrNMEA.length > 9) {
                int Hr = 0;
                int Mins = 0;
                int Secs = 0;

                if (!sArrNMEA[1].equals("")) {

                    Hr = Integer.parseInt(sArrNMEA[1].substring(0, 2));
                    Mins = Integer.parseInt(sArrNMEA[1].substring(2, 4));

                    if (sArrNMEA[1].length() > 6) {

                        Secs = Integer.parseInt(sArrNMEA[1].substring(4, 6));
                    } else {
                        Secs = Integer.parseInt(sArrNMEA[1].substring(4));
                    }

                }
                if (!sArrNMEA[9].equals("")) {
                    int Day = Integer.parseInt(sArrNMEA[9].substring(0, 2));
                    int Month = Integer.parseInt(sArrNMEA[9].substring(2, 4));
                    if (Month > 0) {
                        Month = Month - 1;
                    }
                    int Year = Integer.parseInt(sArrNMEA[9].substring(4));
                    Year = 2000 + Year;

                    if (!sArrNMEA[1].equals("")) {

                        Calendar cal = Calendar.getInstance(TimeZone
                                .getTimeZone("UTC"));
                        cal.set(Year, Month, Day, Hr, Mins, Secs);

                        nmeaTime = String.valueOf(cal.getTimeInMillis());

                    }

                }



                result = true;
            }
        } catch (Exception e) {

        }

        return result;

    }

        private boolean IsValid(String strNMEA) {
        // Compare the characters after the asterisk to the calculation
        strNMEA = strNMEA.replace("\r", "");
        strNMEA = strNMEA.replace("\n", "");
        return strNMEA.substring(0, strNMEA.length())
                .substring(strNMEA.indexOf("*") + 1)
                .equalsIgnoreCase(GetChecksum(strNMEA));
    }

 private String GetChecksum(String strNMEA) {
    // Loop through all chars to get a checksum

    int Checksum = 0;
    try {
        char ch = '\0';
        for (int i = 0; i < strNMEA.length(); i++) {
            ch = strNMEA.charAt(i);
            if (ch == '$') {
                // Ignore the dollar sign
            } else if (ch == '*') {
                // Stop processing before the asterisk
                break;
            } else {
                // Is this the first value for the checksum?
                if (Checksum == 0) {
                    // Yes. Set the checksum to the value
                    Checksum = (byte) ch;
                } else {
                    // No. XOR the checksum with this character's value
                    Checksum = Checksum ^ (byte) ch;
                }
            }
        }
    } catch (Exception e) {

    }
    // Return the checksum formatted as a two-character hexadecimal
    return Integer.toHexString(Checksum);
}