嗨，我有一个全屏应用；首先我想要例如。下午 6 点隐藏所有对象，然后在每天的特定时间再次显示它们。基于设备时间。
其次，我想每 15 分钟发送一次状态和 GPS 信息，我有一个方法，但我怎么能每 15 分钟调用一次呢？
问问题
4002 次
3 回答
1
要安排重复任务，您可以将 Timer 与 TimerTask 一起使用。
见http://developer.android.com/reference/java/util/Timer.html
例如。对于您的第二个问题，从现在开始每 15 分钟做一次：
long INTERVAL_MSEC = 900000;
Timer timer = new Timer();
TimerTask task = new TimerTask() {
public void run() {
sendStatusAndGPS();
}
}
timer.scheduleAtFixedRate(task, 0, INTERVAL_MSEC);
对于您的第一个问题，您可以将开始时间作为第二个参数传递给 timer.scheduleAtFixedRate。
您还可以将 Handler 与 postAtTime 方法一起使用。
于 2013-05-08T09:32:46.473 回答
0
正如nitegazer2003所说，您可以使用：
public void schedule（TimerTask 任务、Date when、long period）；
但是如果你想在一天中的特定时间开始重复计时器，你必须设置 when 变量，例如，如果你想要每天在 6 点重复的计时器，你可以这样做：
// 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);
但是您需要考虑curent_time 没有超过您的开始时间，如果是这样，您应该使用另一个公式来计算何时启动计时器。
于 2013-10-03T06:58:44.527 回答
0
所以你需要一个调度选项来唤醒你的应用程序所以你应该使用AlarmManager这样做你应该看看开发者网站上的这个链接
这个想法是您创建一个每 30 分钟调用一次的服务，然后您将在该服务中写入 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requestCode应该与创建时相同PendingIntent
您的两个问题都在提供的链接中得到解答。
于 2018-04-30T11:50:25.837 回答