尝试封装高德地图定位的一些疑问

查看高德定位Demo,分析后主要有几步

配置参数->开始定位->关闭定位->onDestory()释放资源

设计思路:

1. 低侵入性--其他module不会耦合到定位SDK的代码

2. 傻瓜式使用--结合lifecycle监听页面自动释放资源,用户调用方法处理回调即可

相关代码：

internal class AppLocationHelper {

    private var locationClient: AMapLocationClient? = null
    private var locationOption: AMapLocationClientOption? = null
    private var appLocationListener: IAppLocationListener? = null

    /**
     * 开始定位
     */
    fun startLocation(activity: FragmentActivity, iAppLocationListener: IAppLocationListener?) {
        this.appLocationListener = iAppLocationListener
        activity.lifecycle.addObserver(AppLifecycleObserver())
        //初始化client
        locationClient = AMapLocationClient(activity.applicationContext)
        locationOption = getDefaultOption()
        locationClient?.apply {
            //设置定位参数
            setLocationOption(locationOption)
            // 设置定位监听
            setLocationListener(locationListener)
            // 启动定位
            startLocation()
        }
    }

    private fun destroyLocation() {
        if (null != locationClient) {
            /**
             * 如果AMapLocationClient是在当前Activity实例化的，
             * 在Activity的onDestroy中一定要执行AMapLocationClient的onDestroy
             *
             * 由于我们设计成一次性定位,因此停止定位同时释放资源
             */
            locationClient?.stopLocation()
            locationClient?.onDestroy()
            locationClient = null
            locationOption = null
        }
    }

    /**
     * 默认的定位参数
     *
     */
    private fun getDefaultOption(): AMapLocationClientOption {
       //....
        return mOption
    }

    private val locationListener = AMapLocationListener { location ->
        //a!=null和null!=a 效果一样,但后者可以避免一些赋值异常,equal类似,把常量放在前面
        if (null != appLocationListener && null != location) {
            appLocationListener?.onLocationChanged(toJsonObject(location))
        }
    }

    /*
       错误码errorCode说明
       具体看R.string.amapErrorCodeInfo
     */
    private fun toJsonObject(location: AMapLocation): JSONObject {
        val jsonObject = JSONObject()
        jsonObject.put("latitude", location.latitude)
        jsonObject.put("longitude", location.longitude)
        jsonObject.put("province", location.province)
        jsonObject.put("coordType", location.coordType)
        jsonObject.put("city", location.city)
        jsonObject.put("district", location.district)
        jsonObject.put("cityCode", location.cityCode)
        jsonObject.put("adCode", location.adCode)
        jsonObject.put("address", location.address)
        jsonObject.put("country", location.country)
        jsonObject.put("poiName", location.poiName)
        jsonObject.put("street", location.street)
        jsonObject.put("streetNum", location.streetNum)
        jsonObject.put("aoiName", location.aoiName)
        jsonObject.put("floor", location.floor)
        jsonObject.put("errorCode", location.errorCode)
        jsonObject.put("errorInfo", location.errorInfo)
        jsonObject.put("locationDetail", location.locationDetail)
        jsonObject.put("description", location.description)
        jsonObject.put("locationType", location.locationType)
        jsonObject.put("conScenario", location.conScenario)
        return jsonObject
    }

    /**
     * LifecycleObserver监听当前承载的Activity的生命周期
     */
    inner class AppLifecycleObserver : LifecycleObserver {

        @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
        fun onDestroy() {
            destroyLocation()
        }
    }

}

疑问一:

var locationClient=AMapLocationClient(activity.applicationContext)持有content,如果 AppLocationHelper 定义成 object类, locationClient会警告内存泄漏,这个该怎么优化,没找到方案

疑问二:

startLocation(activity: FragmentActivity) 这样封装的传参,一般用哪个比较合适,Activity/FragmentActivity/ComponentActivity,这几个都能用,有点纠结