如何用deviceAdministrator获取adroid上的当前位置(纬度，经度)？

import android.Manifest;
import android.app.admin.DeviceAdminReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.Toast;

public class MyDeviceAdminReceiver extends DeviceAdminReceiver {

    private LocationManager locationManager;
    private LocationListener locationListener;

    @Override
    public void onEnabled(Context context, Intent intent) {
        super.onEnabled(context, intent);
        // 获取位置权限
        if (context.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
            locationListener = new LocationListener() {
                @Override
                public void onLocationChanged(Location location) {
                    // 获取到位置信息
                    double latitude = location.getLatitude();
                    double longitude = location.getLongitude();
                    // 在这里处理获取到的位置信息
                    Toast.makeText(context, "Latitude: " + latitude + ", Longitude: " + longitude, Toast.LENGTH_SHORT).show();
                }

                @Override
                public void onStatusChanged(String provider, int status, Bundle extras) {}

                @Override
                public void onProviderEnabled(String provider) {}

                @Override
                public void onProviderDisabled(String provider) {}
            };
            // 请求位置更新
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
        }
    }

    @Override
    public void onDisabled(Context context, Intent intent) {
        super.onDisabled(context, intent);
        // 停止位置更新
        if (locationManager != null && locationListener != null) {
            locationManager.removeUpdates(locationListener);
        }
    }
}