初始化
在 SystemServer 启动的时候,会生成一个 ConnectivityService 的实例,
try {
Log.i(TAG, "Starting Connectivity Service.");
ServiceManager.addService(Context.CONNECTIVITY_SERVICE, new
ConnectivityService(context));
} catch (Throwable e) {
Log.e(TAG, "Failure starting Connectivity Service", e);
}
ConnectivityService 的构造函数会创建 WifiService,
if (DBG) Log.v(TAG,......
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