问Android:当互联网无法到达，但连接到网络时，广播或回调。

EN

public void GET(){

    String result = "";
    HttpResponse response;
    HttpEntity entity;

    try {

        HttpPost httppost = new HttpPost("http://google.com");
        DefaultHttpClient httpclient = getHttpClientImpl();

        response = httpclient.execute(httppost);
        entity = response.getEntity();

        if (entity != null) {
            InputStream is = entity.getContent();
            if (is != null) {
                StringBuilder sb = new StringBuilder();
                String line;
                try {
                    BufferedReader reader = new BufferedReader(
                            new InputStreamReader(is, "UTF-8"), 8 * 1024);
                    while ((line = reader.readLine()) != null) {
                        sb.append(line);// .append("\n");
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    is.close();
                }
                result = sb.toString();
                if (responseXML.equals("")){

                //  Internet connectivity is lost.

                }else {

                //  Internet connectivity still here xnjoy.

                }

            }
            entity.consumeContent();
        }
        httpclient.getConnectionManager().shutdown();

    } catch (Exception e) {
        Log.d("InputStream", e.getLocalizedMessage());
    }

 }