onProviderEnabled无法正常工作？

Question

用于在GPS和GPS之间切换网络位置提供程序我刚试过这样的方式，以确定何时禁用提供程序切换到另一个，但我的onProviderEnabled()未被调用

public void onProviderDisabled(String provider) {
  Toast.makeText(TrackerService.this, "Disabled : " + provider, Toast.LENGTH_LONG).show();
}
public void onProviderEnabled(String provider) {
  Toast.makeText(TrackerService.this, "Enabled : " + provider, Toast.LENGTH_LONG).show()

Answer 1

定义位置监听器，如下所示：

LocationListener locationListener = new LocationListener() {
            public void onLocationChanged(Location location) {

            }
            public void onProviderDisabled(String provider) {}
            public void onProviderEnabled(String provider) {}
            public void onStatusChanged(String provider, int status, Bundle extras) {}
        };

然后：

LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
  lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
  lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);