我在这个仍然不成功的情况下搜索了很多，我想获得我的应用程序运行的本地时间。我可以使用calender来获得它，但我的问题是，当用户登录到应用程序时，我想读取正确的时间。这意味着实际上用户必须在 9:30 登录，但如果他迟到了 30 分钟。即使他将设备中的当地时间改回 9:30，他也会登录应用程序。（可能性）我想读取正确的时间（即 10:00）。由于这个问题，我想获得全球时间，而不考虑设备时间。我也可以为此使用服务器，但有时是应用程序。将没有互联网设施。
我怎样才能做到这一点？
问问题
897 次
1 回答
2
如果您的设备配备 GPS，您可以从 GPS 获取正确的当地时间。用户不能更改 GPS 时间。;)
您可以强制您的用户打开其 GPS，否则关闭您的应用程序。
location.getTime()
public long getTime ()
Since: API Level 1
Returns the UTC time of this fix, in milliseconds since January 1, 1970.
更新：
在您的活动中：
protected void btnGetPoint_onClick() {
try {
Intent intentToFire = new Intent(
ReceiverPositioningAlarm.ACTION_REFRESH_SCHEDULE_ALARM);
intentToFire.putExtra(ReceiverPositioningAlarm.COMMAND,
ReceiverPositioningAlarm.SENDER_ACT_DOCUMENT);
sendBroadcast(intentToFire);
OnNewLocationListener onNewLocationListener = new OnNewLocationListener() {
@Override
public void onNewLocationReceived(Location location) {
try {
// do what you want
} catch (Exception e) {
MessageBox.showException(ActDocument.this, e);
}
}
};
// start listening for new location
ReceiverPositioningAlarm.setOnNewLocationListener(
onNewLocationListener);
} catch (Exception e) {
//...
}
}
它的界面：
import android.location.Location;
public interface OnNewLocationListener {
public abstract void onNewLocationReceived(Location location);
}
GPS接收器：
package org.mabna.order.receivers;
import java.util.ArrayList;
import org.mabna.order.utils.Farsi;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.location.GpsStatus;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.Gravity;
import android.widget.Toast;
public class ReceiverPositioningAlarm extends BroadcastReceiver {
public static final String COMMAND = "SENDER";
public static final int SENDER_ACT_DOCUMENT = 0;
public static final int SENDER_SRV_POSITIONING = 1;
public static final int MIN_TIME_REQUEST = 5 * 1000;
public static final int MIN_DISTANCE = 10;// in meters
public static final String ACTION_REFRESH_SCHEDULE_ALARM =
"org.mabna.order.ACTION_REFRESH_SCHEDULE_ALARM";
private static Location currentLocation;
private static Location prevLocation;
private static Context _context;
private String provider = LocationManager.GPS_PROVIDER;
private static LocationManager locationManager;
private static LocationListener locationListener = new LocationListener() {
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
try {
String strStatus = "";
switch (status) {
case GpsStatus.GPS_EVENT_FIRST_FIX:
strStatus = "GPS_EVENT_FIRST_FIX";
break;
case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
strStatus = "GPS_EVENT_SATELLITE_STATUS";
break;
case GpsStatus.GPS_EVENT_STARTED:
strStatus = "GPS_EVENT_STARTED";
break;
case GpsStatus.GPS_EVENT_STOPPED:
strStatus = "GPS_EVENT_STOPPED";
break;
default:
strStatus = String.valueOf(status);
break;
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onLocationChanged(Location location) {
try {
gotLocation(location);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
@Override
public void onReceive(final Context context, Intent intent) {
_context = context;
locationManager = (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
if (locationManager.isProviderEnabled(provider)) {
locationManager.requestLocationUpdates(provider, MIN_TIME_REQUEST,
MIN_DISTANCE, locationListener);
Location gotLoc = locationManager.getLastKnownLocation(provider);
gotLocation(gotLoc);
} else {
Toast t = Toast.makeText(context,
Farsi.Convert("please turn the GPS on"),
Toast.LENGTH_LONG);
t.setGravity(Gravity.CENTER, 0, 0);
t.show();
Intent settinsIntent = new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
settinsIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
_context.startActivity(settinsIntent);
}
}
private static void gotLocation(Location location) {
try {
prevLocation = currentLocation == null ?
null : new Location(currentLocation);
currentLocation = location;
if (isLocationNew()) {
// saveLocation(location);
// informing the classes outside of this class that e new point
// received
OnNewLocationReceived(location);
stopLocationListener();
}
} catch (Exception e) {
Toast.makeText(_context,
"error" + e.getMessage(),
Toast.LENGTH_SHORT).show();
}
}
private static boolean isLocationNew() {
if (currentLocation == null) {
return false;
} else if (prevLocation == null) {
return true;
} else if (currentLocation.getTime() == prevLocation.getTime()) {
return false;
} else {
return true;
}
}
public static void stopLocationListener() {
if (locationManager != null)
{
locationManager.removeUpdates(locationListener);
}
}
// listener ----------------------------------------------------
static ArrayList<OnNewLocationListener> arrOnNewLocationListener =
new ArrayList<OnNewLocationListener>();
// Allows the user to set a OnNewLocationListener outside of this class and
// react to the event.
// A sample is provided in ActDocument.java in method: startStopTryGetPoint
public static void setOnNewLocationListener(
OnNewLocationListener listener) {
arrOnNewLocationListener.add(listener);
}
public static void clearOnNewLocationListener(
OnNewLocationListener listener) {
arrOnNewLocationListener.remove(listener);
}
// This function is called after the new point received
private static void OnNewLocationReceived(Location location) {
// Check if the Listener was set, otherwise we'll get an Exception when
// we try to call it
if (arrOnNewLocationListener != null) {
// Only trigger the event, when we have any listener
for (int i = arrOnNewLocationListener.size() - 1; i >= 0; i--) {
arrOnNewLocationListener.get(i).onNewLocationReceived(
location);
}
}
}
}
在清单中：
<receiver android:name=".ReceiverPositioningAlarm" >
<!-- this Broadcast Receiver only listens to the following intent -->
<intent-filter >
<action android:name="org.mabna.order.ACTION_REFRESH_SCHEDULE_ALARM" />
</intent-filter>
</receiver>
于 2012-05-15T05:00:34.800 回答