当崩溃是没有互联网连接 [英] Crash when is no internet connection

问题描述

以下code崩溃是没有interenet连接时：

The following code crashes when is no interenet connection :

    public String gourl(String myurl,String params) {

        URL url;
        String rasp = "";

        try {
            url = new URL(myurl + params);
            BufferedReader rd = new BufferedReader(new InputStreamReader(
                    url.openStream()));
            String line = "";
            while ((line = rd.readLine()) != null) {
                rasp=rasp + line;
            }

            return rasp;
        } catch (Exception e) {
            Log.w("DHA", "EXCEPTIE URL");
        }       
        return null;
}

如何从发生prevent呢？

How can i prevent this from happening ?

推荐答案

检查连接之前执行你的方法，这样的事情：

Check connection before execute your method, something like that:

    public boolean isNetworkConnected() {
         final ConnectivityManager conMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
         final NetworkInfo activeNetwork = conMgr.getActiveNetworkInfo();
         return activeNetwork != null && activeNetwork.getState() == NetworkInfo.State.CONNECTED;
    }

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