我有一个应用程序将系统时间与从 GPS 锁定获取的时间进行比较。如果我在我的 HTC One X 上运行该应用程序就可以正常工作。一个 X 正在运行 4.1。如果我在 HTC Desire C(2.3) 上运行该应用程序，则 Gps 的时间与系统时间相同。
例如，如果我进入手机设置并将手机的系统时间更改为向前 1 小时，那么来自 GPS 的时间也反映了这一点。谁能告诉我为什么会这样。它不是 Android 版本，因为它也适用于运行 2.3 的三星 Ace2。我认为这是特定设备的问题。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
nfcscannerapplication = (NfcScannerApplication) getApplication();
appSharedPrefs = PreferenceManager.getDefaultSharedPreferences(NfcBaseActivity.this.getApplicationContext());
prefsEditor = appSharedPrefs.edit();
mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
//setTitle(getCarername() + " is logged in");
}
@Override
protected void onResume() {
super.onResume();
Cursor c = nfcscannerapplication.loginValidate.queryAllFromCompanyIdTable();
if (c != null && c.getCount() > 0) {
mlocListener = new MyLocationListener();
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.GINGERBREAD_MR1) {
mlocManager.requestSingleUpdate(LocationManager.GPS_PROVIDER, mlocListener, null);
}else{
mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
}
}
}
private class MyLocationListener implements LocationListener {
@Override
public void onLocationChanged(Location loc) {
if(mlocListener != null){
mlocManager.removeUpdates(mlocListener);
mlocListener = null;
}
DateTime dt = new DateTime(loc.getTime());
DateTimeFormatter df3 = DateTimeFormat.forPattern("yyyy-MM-dd H:mm:ss.SSS");
String formattedExternalTime = df3.print(dt);
Log.e(TAG, "formatted ext time = " + formattedExternalTime);
nfcscannerapplication.setExternalTime(dt);
String systemExternalTimeTolerance = appSharedPrefs.getString("180", null);
Log.e(TAG, " comp opt 180 = " + systemExternalTimeTolerance);
long toleranceInMillis = Long.parseLong(systemExternalTimeTolerance) * 1000 * 60;
Log.e(TAG, "toleranceInMillis = " + toleranceInMillis);
long differenceBetweenTimes = nfcscannerapplication.getInternalTime().getMillis() -
nfcscannerapplication.getExternalTime().getMillis();
Log.e(TAG, "About to make comparison1 differenceBetweenTimes = " + differenceBetweenTimes);
if(differenceBetweenTimes > toleranceInMillis){
DateTimeFormatter df4 = DateTimeFormat.forPattern("yyyy-MM-dd H:mm");
String formattedExternalTime2 = df4.print(dt);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
NfcBaseActivity.this);
// set title
alertDialogBuilder.setTitle("Please set your phone's system time to " + formattedExternalTime2);
// set dialog message
alertDialogBuilder
.setMessage("Click Ok to exit app")
.setCancelable(false)
.setPositiveButton("Ok",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
dialog.cancel();
System.exit(0);
}
});
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}
long differenceBetweenTimes2 = nfcscannerapplication.getExternalTime().getMillis() -
nfcscannerapplication.getInternalTime().getMillis();
Log.e(TAG, "About to make comparison2 differenceBetweenTimes2 = " + differenceBetweenTimes2);
if(differenceBetweenTimes2 > toleranceInMillis){
DateTimeFormatter df4 = DateTimeFormat.forPattern("yyyy-MM-dd H:mm");
String formattedExternalTime2 = df4.print(dt);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
NfcBaseActivity.this);
// set title
alertDialogBuilder.setTitle("Please set your phone's system time to " + formattedExternalTime2);
// set dialog message
alertDialogBuilder
.setMessage("Click Ok to exit app")
.setCancelable(false)
.setPositiveButton("Ok",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
dialog.cancel();
System.exit(0);
}
});
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}
}