WIFI扫描流程分析

  一．启动wifi服务

1.在 SystemServer 启动的时候,会生成一个 ConnectivityService 的实例

路径为：/frameworks/base/services/java/com/android/server/SystemServer.java

try {

             Slog.i(TAG, "Connectivity Service");

             connectivity = ConnectivityService.getInstance(context);

             ServiceManager.addService(Context.CONNECTIVITY_SERVICE, connectivity);

            } catch (Throwable e) {

                Slog.e(TAG, "Failure starting Connectivity Service", e);

            }

2.ConnectivityService 类中private ConnectivityService(Context context) 构造函数创建

    WifiService和WifiStateTracker对象

/frameworks/base/services/java/com/android/server/ConnectivityService.java

for (int netType : mPriorityList) {

            switch (mNetAttributes[netType].mRadio) {

            case ConnectivityManager.TYPE_WIFI:

                if (DBG) Slog.v(TAG, "Starting Wifi Service.");

                WifiStateTracker wst = new WifiStateTracker(context, mHandler);

                WifiService wifiService = new WifiService(context, wst);

                ServiceManager.addService(Context.WIFI_SERVICE, wifiService);

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