java 监听器实现原理

实例二：

 @Override
    public void onStart(Intent intent, int startid) {
        super.onStart(intent, startid);

 locationService = ((LocationApplication) getApplication()).locationService;
        //获取locationservice实例，建议应用中只初始化1个location实例，然后使用，可以参考其他示例的activity，都是通过此种方式获取locationservice实例的
        locationService.registerListener(mListener);        //注册监听

  if (type == 0) {
            locationService.setLocationOption(locationService.getDefaultLocationClientOption());
        } else if (type == 1) {
            locationService.setLocationOption(locationService.getOption());
        }

   }

   @Override
    public void onDestroy() {
        Log.i("warn", "ondestroy");
        locationService.stop(); //停止定位服务
        locationService.unregisterListener(mListener); //注销掉监听
    }