안드로이드 와이파이 연결시 준비된 코드 실행2

 Run code when internet / WiFi is connected

Yeah i agree with @alpinescrambler about your manifest declaration should be like this and you want to observe connectivity change

<receiver android:name=".SMSReceiver" >
            <intent-filter>
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
            </intent-filter>
        </receiver>

You should also add this permissions in the manifest

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

If you want to observe all network changes check this out

    public class SMSReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i(TAG, SMSReceiver.class.getSimpleName() +"\naction: " + intent.getAction());
        if(isOnline(context) == true) {
            //do your staff
            context.startActivity(new Intent(context, MainActivity.class));
        }
    }

    boolean isOnline(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo netInfo = cm.getActiveNetworkInfo();
        if (netInfo != null && netInfo.isConnectedOrConnecting()) {
            return true;
        }
        return false;
    }

}

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[출처] http://stackoverflow.com/questions/25941362/run-code-when-internet-wifi-is-connected