Question

我正在通过这个程序尝试一个简单的http连接，但是获得了resourcenotfoundexception，无法解析主机“www.google.com”：没有与hostname相关的地址。这背后的原因是什么？

public class HttpClientActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

//      StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
//              .permitAll().build();
//      StrictMode.setThreadPolicy(policy);

//      connect();

        new Connection().execute();

    }

    private class Connection extends AsyncTask {

        @Override
        protected Object doInBackground(Object... arg0) {
            connect();
            return null;
        }

    }

    private void connect() {
        try {
            DefaultHttpClient client = new DefaultHttpClient();
            HttpGet request = new HttpGet("http://www.google.com");
            HttpResponse response = client.execute(request);
        } catch (ClientProtocolException e) {
            Log.d("HTTPCLIENT", e.getLocalizedMessage());
        } catch (IOException e) {
            Log.d("HTTPCLIENT", e.getLocalizedMessage());
        }
    }

}

Answer 1

请确认您可以通过自己的APP访问互联网。

该权限在AndroidManifest.xml中定义。确保您拥有以下权限

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

编辑如果仍然无法使用，请尝试使用此代码

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
HttpURLConnection urlc = (HttpURLConnection) (new URL("http://www.google.com").openConnection());
urlc.setRequestProperty("User-Agent", "Test");
urlc.setRequestProperty("Connection", "close");
urlc.setConnectTimeout(1000);
urlc.connect();
Log.i(Tag,Integer.toString(urlc.getResponseCode()));

无法解析主机的http连接

1 个答案: