谁用过百度地图 地理围栏啊 ，为什么我的围栏无效

Question

//创建围栏对象
mGeofenceClient = new GeofenceClient(getApplicationContext());
//注册围栏监听并开始围栏扫描服务
mGeofenceClient.registerGeofenceTriggerListener(new GeofenceClient.OnGeofenceTriggerListener() {

        @Override
        public void onGeofenceTrigger(String arg0) {
            textView2.setText("进入围栏成功");
        }
    });
    mGeofenceClient.start();
    //设置围栏参数
    BDGeofence fence = new BDGeofence.Builder().
            setGeofenceId("1").
            setCircularRegion(40.042364, 116.334424,BDGeofence.RADIUS_TYPE_MIDDELE).
            setExpirationDruation(100000).
            setCoordType(BDGeofence.COORD_TYPE_BD09LL).build();
    mGeofenceClient.addBDGeofence(fence, new GeofenceClient.OnAddBDGeofencesResultListener() {

        @Override
        public void onAddBDGeofencesResult(int status, String arg1) {
            try {
                if (status == BDLocationStatusCodes.SUCCESS) {
                    textView2.setText("添加围栏成功");
                    mGeofenceClient.startGeofenceScann();
                }
            } catch (Exception e) {
                Log.e("lzp", e.getMessage());
            }
        }
    });

这是在oncreate（）中写的，key没有问题，可以获取当前的位置信息，就是围栏不起作用，求解~~~

Answer 1

BDGeofence.RADIUS_TYPE_MIDDELE 这个半径类型啥意思啊？