android - onLocationChanged从未调用过

Question

我目前正在实施一项使用Google API获取用户当前位置的功能。

@Override
public void onLocationChanged(Location location) {
    mLastLocation = location;
    LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
    mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng)); // user location center in map (every update)
    mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
}

@Override
public void onConnected(@Nullable Bundle bundle) {
    if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
    }
    Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
    if (location == null) {
        mLocationRequest = LocationRequest.create()
                .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
                .setSmallestDisplacement(DISPLACEMENT)
                .setInterval(UPDATE_INTERVAL)
                .setFastestInterval(FASTEST_INTERVAL);
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
    }else{

    }
}

但是，当onConnected中的requestLocationUpdates时，永远不会触发onLocationChanged回调函数。我已经记录了几个状态，显示已创建mLocationRequest并调用requestLocationUpdates。

有关于此的任何想法吗？谢谢大家！