android中检查是否联网code

直接贴判断代码了额：

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? ? private boolean isNetworkAvailable() {

        ConnectivityManager connManager = (ConnectivityManager) this                .getSystemService(CONNECTIVITY_SERVICE);        NetworkInfo networkInfo = connManager.getActiveNetworkInfo();        if (networkInfo != null) {            return networkInfo.isAvailable();        } else            return false;}