onLocationChanged不会自动调用

问题描述：

我有一个在Android的onLocationChanged事件的一个问题。这里的触发：

I have a problem with onLocationChanged event in Android. Here's the triggering:

case R.id.start: {
    Points.add(overlay.getMyLocation()); // Points' type is ArrayList<GeoPoint>
    mgr.requestLocationUpdates(best, 0, 3, locationListener);
    }
    break;

和这里的onLocationChanged方式：

And here's the onLocationChanged method:

public void onLocationChanged(Location location) {
    i++;
    Points.add(overlay.getMyLocation());
    MapOverlay mapOverlay = new MapOverlay(Points.get(i-1), Points.get(i));
    map.getOverlays().add(mapOverlay); //does the drawing
    mMapController.animateTo(Points.get(i));
}

所以，onLocationChanged只调用一次，只有在我preSS开始。它应该是每一个位置发生了变化，适当的时候会自动调用？就我而言，事实并非如此。
请帮我。

So, onLocationChanged is called only once and only after I press "start". It's supposed to be called automatically every time the location has changed, right? In my case, it's not.
Please help me.

答

问题似乎得到解决。在的onCreate，我说：

Problem seems to be solved. In onCreate, I added:

Criteria crit = new Criteria();
crit.setAccuracy(Criteria.ACCURACY_FINE);
best = mgr.getBestProvider(crit, false);
mgr.requestLocationUpdates(best, 0, 1, locationListener);

onLocationChanged现在看起来这样的：

onLocationChanged now looks like that:

@Override
public void onLocationChanged(Location location) {
    i++;
    nextPoint = overlay.getMyLocation();
    latitude = nextPoint.getLatitudeE6();
    longtitude = nextPoint.getLongitudeE6();
    lastPoint = new GeoPoint((int) latitude, (int) longtitude);
    Points.add(lastPoint);
    MapOverlay mapOverlay = new MapOverlay(Points.get(i - 1), Points.get(i));
    map.getOverlays().add(mapOverlay);
    mMapController.animateTo(Points.get(i));
    nextPoint = null;
    lastPoint = null;
}

另外，很重要的方法：

Also, very important methods:

@Override
protected void onResume() {
    super.onResume();
    mgr.requestLocationUpdates(best, 10000, 1, locationListener);
}

@Override
protected void onPause() {
    super.onPause();
    mgr.removeUpdates(locationListener);
}

也有一些新的权限：

And also some new permissions:

<uses-permission android:name="android.permission.ACCESS_GPS" />
        <uses-permission android:name="android.permission.ACCESS_LOCATION" />
        <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
        <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
        <uses-permission android:name="android.permission.INTERNET" />

onLocationChanged不会自动调用

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