can not setInterval in onLocationChanged

Question

I am trying the 'LocationUpdates' sample from http://developer.android.com/training/location/receive-location-updates.html . This application gets and prints location notifications.

I am trying to change the interval of the location updates according to my latest location.

So - I had added mLocationRequest.setInterval() into onLocationChanged

The result is very wrong. My application is bombarded with many location updates (few a second!!!!)

My only change to the sample is this:

private int x=0;
@Override
public void onLocationChanged(Location location) {
    // Report to the UI that the location was updated
    mConnectionStatus.setText(R.string.location_updated);

    // In the UI, set the latitude and longitude to the value received
    mLatLng.setText(String.valueOf(x++));

    mLocationRequest.setInterval(1000);          // Change 1
    mLocationClient.requestLocationUpdates(mLocationRequest, this); // Change 2
}

How can I change the interval inside onLocationChanged ?

I think that the problem is that requestLocationUpdates resets the last request, and then immediately sends another notification. so a loop is created. (faster than the fastest interval). so I need a reliable way to change the interval of a 'live' LocationRequest

Answer 1

You are not supposed to call mLocationClient.requestLocationUpdates(mLocationRequest, this); inside onLocationChanged(Location location)

since you are registering the listener again, and you will get the first call immediately.

so what i would do would be:

1. dont call mLocationClient.requestLocationUpdates(mLocationRequest, this); and see if anyways mLocationRequest.setInterval(1000); is taking effect

2. if this doesnt work, try to unregister the listener, and then use a trick to wait before registering it again with the new settings, something like:

    Handler h = new Handler();
    @Override
      public void onLocationChanged(Location location) {
       //... all your code
   
   
        mLocationRequest.setInterval(1000);          
        mLocationClient.removeLocationUpdates(LocationListener listener)
   
        h.postDelayed (new Runnable(){
   
          public void run(){
            mLocationClient.requestLocationUpdates(mLocationRequest, YOUROUTTERCLASS.this); 
          }
   
        }, 1000);
   
       }
   

   So during one second there is not registered listener, so you wont get any updated, and after that, the listener is registerered with that interval.