Question

嗨，我有一个全屏应用程序; 第一我想要，例如。下午6点隐藏所有对象，然后每天在特定时间再次显示它们。根据设备时间。

其次，我想每15分钟发送状态和GPS信息，我有一个方法，但我怎么能每15分钟调用一次？

Answer 1

要计划重复任务，可以使用带TimerTask的Timer。

请参阅http://developer.android.com/reference/java/util/Timer.html

EG。对于你的第二个问题，从现在起每15分钟做一次事情：

long INTERVAL_MSEC = 900000;
Timer timer = new Timer();
TimerTask task = new TimerTask() {
    public void run() {
        sendStatusAndGPS();
    }
}
timer.scheduleAtFixedRate(task, 0, INTERVAL_MSEC);

对于第一个问题，您可以将开始时间作为第二个参数传递给timer.scheduleAtFixedRate。

您也可以使用带有postAtTime方法的Handler。

Answer 2

正如nitegazer2003所说，你可以使用：

public void schedule（TimerTask任务，Date when，long period）;

但是如果你想在一天中的特定时段开始重复计时器，你必须设置变量，例如，如果您希望计时器每天在6处重复，您可以执行以下操作：

// get today date
    Date curent_time= new Date(System.currentTimeMillis());
    Calendar cal = Calendar.getInstance();
    cal.setTime(curent_time);
    int hour = cal.get(Calendar.HOUR);
    int min = cal.get(Calendar.MINUTE);
    int sec = cal.get(Calendar.SECOND);

    long when = (6 * 3600)
    - ( (hour*3600) + (min *60) + sec);
// interval should be based on miliseconds so
    long interval = 24*60*60*1000;
    timer.scheduleAtFixedRate(new testtimertask(), when, interval);

但你需要考虑curent_time没有超过你的开始时间，如果是这样你应该使用另一个公式计算何时启动计时器。

Answer 3

因此您需要一个可以唤醒您的应用程序的计划选项，因此您应该使用AlarmManager来执行此操作，您应该查看this link on developers site

这个想法是你创建一个每30分钟调用一次的服务，你将在该服务中写下你的GPS位置代码。

这是我在LocationService.Class

中的代码
public class LocationService extends Service { private class LocationListener implements android.location.LocationListener { Location mLastLocation; public LocationListener(String provider) { Log.e(TAG, "LocationListener " + provider); mLastLocation = new Location(provider); } @Override public void onLocationChanged(Location currentLocation) { sendAllLocationsToServer(); } @Override public void onProviderDisabled(String provider) { Log.e(TAG, "onProviderDisabled: " + provider); } @Override public void onProviderEnabled(String provider) { Log.e(TAG, "onProviderEnabled: " + provider); } @Override public void onStatusChanged(String provider, int status, Bundle extras) { Log.e(TAG, "onStatusChanged: " + provider); } } private void sendAllLocationsToServer() { //send locations to server } LocationListener[] mLocationListeners = new LocationListener[] { new LocationListener(LocationManager.GPS_PROVIDER), new LocationListener(LocationManager.NETWORK_PROVIDER) }; @Override public IBinder onBind(Intent arg0) { return null; } @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.e(TAG, "onStartCommand"); super.onStartCommand(intent, flags, startId); if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { // TODO: Consider calling // ActivityCompat#requestPermissions // here to request the missing permissions, and then overriding // public void onRequestPermissionsResult(int requestCode, String[] permissions, // int[] grantResults) // to handle the case where the user grants the permission. See the documentation // for ActivityCompat#requestPermissions for more details. return START_STICKY; } if (mLocationManager == null) { initializeLocationManager(); try { mLocationManager.requestLocationUpdates( LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE, mLocationListeners[1]); } catch (java.lang.SecurityException ex) { Log.i(TAG, "fail to request location update, ignore", ex); } catch (IllegalArgumentException ex) { Log.d(TAG, "network provider does not exist, " + ex.getMessage()); } try { mLocationManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE, mLocationListeners[0]); } catch (java.lang.SecurityException ex) { Log.i(TAG, "fail to request location update, ignore", ex); } catch (IllegalArgumentException ex) { Log.d(TAG, "gps provider does not exist " + ex.getMessage()); } } else { /*try { mLocationManager.requestLocationUpdates( LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE, mLocationListeners[1]); } catch (java.lang.SecurityException ex) { Log.i(TAG, "fail to request location update, ignore", ex); } catch (IllegalArgumentException ex) { Log.d(TAG, "network provider does not exist, " + ex.getMessage()); }*/ try { mLocationManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE, mLocationListeners[0]); } catch (java.lang.SecurityException ex) { Log.i(TAG, "fail to request location update, ignore", ex); } catch (IllegalArgumentException ex) { Log.d(TAG, "gps provider does not exist " + ex.getMessage()); } try { mLocationManager.requestLocationUpdates( LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE, mLocationListeners[1]); } catch (java.lang.SecurityException ex) { Log.i(TAG, "fail to request location update, ignore", ex); } catch (IllegalArgumentException ex) { Log.d(TAG, "network provider does not exist, " + ex.getMessage()); } } return START_STICKY; } public void cancelService(){ AlarmManager alarmMgr = (AlarmManager) getSystemService(Context.ALARM_SERVICE); Intent alarmIntent = new Intent(getApplicationContext(), LocationService.class); alarmIntent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT); PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 0, alarmIntent, 0); alarmMgr.cancel(pendingIntent); } @Override public void onCreate() { Log.e(TAG, "onCreate"); //TODO should implement an stop point for this service initializeLocationManager(); try { mLocationManager.requestLocationUpdates( LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE, mLocationListeners[1]); } catch (java.lang.SecurityException ex) { Log.i(TAG, "fail to request location update, ignore", ex); } catch (IllegalArgumentException ex) { Log.d(TAG, "network provider does not exist, " + ex.getMessage()); } try { mLocationManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE, mLocationListeners[0]); } catch (java.lang.SecurityException ex) { Log.i(TAG, "fail to request location update, ignore", ex); } catch (IllegalArgumentException ex) { Log.d(TAG, "gps provider does not exist " + ex.getMessage()); } } @Override public void onDestroy() { Log.e(TAG, "onDestroy"); super.onDestroy(); if (mLocationManager != null) { for (int i = 0; i < mLocationListeners.length; i++) { try { mLocationManager.removeUpdates(mLocationListeners[i]); } catch (Exception ex) { Log.i(TAG, "fail to remove location listners, ignore", ex); } } } stopSelf(); } private void initializeLocationManager() { Log.e(TAG, "initializeLocationManager"); if (mLocationManager == null) { mLocationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE); } } }

您可以通过调用cancel（）方法取消此服务，但您的requestCode应与创建PendingIntent
时相同
您提出的所有问题都回答了您的问题。

在每天的特定时间调用方法

3 个答案: