我的应用场景是我想跟踪员工的位置。我有一个广播接收器,它监听设备启动广播并注册一个报警管理器。当警报管理器滴答时,它会注册两个位置监听器,一个用于监听gps,另一个用于监听网络。我希望当我在onLocationChange()方法中获得第一个位置更新时,保存位置并取消注册该位置监听器,以便当警报管理器再次打勾时,它不会重复。要取消注册,我将位置侦听器作为静态对象来访问onLocationChange()。但我发现它不是删除位置监听器。这是我的代码示例:
public class BootTimeServiceActivator extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
Calendar calendar = Calendar.getInstance();
AlarmManager am = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent mIntent = new Intent(context, MyBroadCastReceiver.class);
PendingIntent mPendingIntent = PendingIntent.getBroadcast(context, 0, mIntent, PendingIntent.FLAG_CANCEL_CURRENT);
am.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 20 * 60 * 1000, mPendingIntent);
}
}
//..........
public class MyBroadCastReceiver extends BroadcastReceiver{
public static LocationManager locationManager;
public static MyLocationListener networkLocationListener;
public static MyLocationListener gpsLocationListener;
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
Toast.makeText(context, "Alarm has been called...", Toast.LENGTH_SHORT).show();
initLocationListeners(context);
registerLocationListeners();
}
public void initLocationListeners(Context context) {
locationManager = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
networkLocationListener = new MyLocationListener(context);
gpsLocationListener = new MyLocationListener(context);
}
public void registerLocationListeners() {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 100, 0, gpsLocationListener);
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 100, 0, gpsLocationListener);
}
}
\\.....
public class MyLocationListener implements LocationListener {
Context context;
public MyLocationListener(Context context) {
this.context = context;
}
@Override
public void onLocationChanged(Location location) {
if(location != null) {
SDCardService sdService = new SDCardService(context);
try {
sdService.logToDB(location);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.d("provider",location.getProvider());
if(location.getProvider().equals(LocationManager.GPS_PROVIDER)) {
MyBroadCastReceiver.locationManager.removeUpdates(MyBroadCastReceiver.gpsLocationListener);
}
else if(location.getProvider().equals(LocationManager.NETWORK_PROVIDER)) {
MyBroadCastReceiver.locationManager.removeUpdates(MyBroadCastReceiver.networkLocationListener);
}
}
}
任何人都可以指导我错在哪里吗?
答案 0 :(得分:1)
试试这个..
lmNetwork.removeUpdates(networkLocationListener);
lmGps.removeUpdates(gpsLocationListener);
答案 1 :(得分:1)
啊......我有一个错字错误。实际上在MyBroadCastREciever类中,我将gpsListener注册两次:
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
100, 0,
gpsLocationListener);
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
100, 0,
networkLocationListener); //previously was gpsLocationListener again. Wrong.
那个网络监听器没有被删除。
答案 2 :(得分:0)
你可以用内部类这样做,并删除监听器onPause():
@Override
protected void onPause() {
super.onPause();
GPSlocationManager.removeUpdates(GPSLocationListener);
CellLOcationManager.removeUpdates(NetworkLocationListener);
}
private void SetLocationManager() {
GPSlocationManager =(LocationManager)getSystemService(Context.LOCATION_SERVICE);
CellLOcationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
NetworkLocationListener = new MyNetworkLocationListener();
GPSLocationListener = new MyGPSLocationListener();
GPSlocationManager.requestLocationUpdates("gps", 5000, 1, GPSLocationListener);
CellLOcationManager.requestLocationUpdates("network", 10000, 1, NetworkLocationListener);
}
private class MyNetworkLocationListener implements LocationListener {
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
}