Android App中為UnknownHostException，但可在瀏覽器中使用

Question

我知道這個問題已經在SO上問過好幾次了，但是那並不能解決我的問題。

我需要清單文件中的權限。 Web服務在瀏覽器中運行良好，但在Android應用程序中提供了UnknownHostException。

這是我的機器人代碼：

內部艙位

private class WebService extends AsyncTask<String, Void, String>{
            @Override
            protected String doInBackground(String... urls){
                String res = "";
                _callService();
                return res;
            }
            @Override
            protected void onPostExecute(String result){
                progressDialog.dismiss();
                //reset();
            }
        }

_callService（）方法：

public void _callService(){
        try{
            HttpResponse response = null;
            HttpParams httpParameters = new BasicHttpParams();
            HttpConnectionParams.setConnectionTimeout(httpParameters, 400000);
            HttpConnectionParams.setSoTimeout(httpParameters, 600000);
            HttpClient httpclient = new DefaultHttpClient(httpParameters);
            HttpPost httppost = new HttpPost(CommonObject.URL + "CheckUser");
            List<NameValuePair> values = new ArrayList<NameValuePair>();

            values.add(new BasicNameValuePair("Type", String.valueOf(CommonObject.type)));

            if(s5.equalsIgnoreCase("Company Account")){
                values.add(new BasicNameValuePair("UserType", "2"));
                values.add(new BasicNameValuePair("CustomerFirstName", s6));
            }else{
                values.add(new BasicNameValuePair("UserType", "1"));
                values.add(new BasicNameValuePair("CustomerFirstName", s1));
            }

            values.add(new BasicNameValuePair("CustomerEmail", s2));
            values.add(new BasicNameValuePair("CustomerPhoneNo", s3));
            values.add(new BasicNameValuePair("CustomerAccountNo", s4));

            /* Log of above values*/
            Log.v("URL", CommonObject.URL + "CheckUser");
            Log.v("Type", String.valueOf(CommonObject.type));
            if(s5.equalsIgnoreCase("Company Account")){
                Log.v("UserType", "2");
                Log.v("CustomerFirstName", s6);
            }else{
                Log.v("UserType", "1");
                Log.v("CustomerFirstName", s1);
            }
            Log.v("CustomerEmail", s2);
            Log.v("CustomerPhoneNo", s3);
            Log.v("CustomerAccountNo", s4);

            try{
                httppost.setEntity(new UrlEncodedFormEntity(values));
            }catch (UnsupportedEncodingException e) {
                e.printStackTrace();
                Log.e("URL Encoded Form Entity Exception", e.getMessage().toString());
            }

            try{
                response = httpclient.execute(httppost);
            }catch (ClientProtocolException e) {
                e.printStackTrace();
                Log.e("Client Protocol Exception", e.getMessage().toString());
            }catch (IOException e) {
                e.printStackTrace();
                Log.e("IO Exception", e.getMessage().toString());
            }catch(Exception e){
                e.printStackTrace();
                Log.e("Exception", e.getMessage().toString());
            }

            final int statusCode = response.getStatusLine().getStatusCode();
            response_code = String.valueOf(response.getFirstHeader("ResponseCode")).trim();
            response_message = String.valueOf(response.getLastHeader("Message")).trim();

            Log.e("Exact Response From Server", String.valueOf(response));
            Log.e("ResponseCode", response_code);
            Log.e("Message", response_message);

            String content = "";
            if(statusCode == 200){
                HttpEntity mResEntityGet = response.getEntity();
                if (mResEntityGet != null) {
                    try {
                        content = EntityUtils.toString(mResEntityGet);
                    } catch (ParseException e) {
                        e.printStackTrace();
                        Log.e("Parse Exception", e.getMessage().toString());
                    } catch (IOException e) {
                        e.printStackTrace();
                        Log.e("IO Exception", e.getMessage().toString());
                    } catch(Exception e){
                        e.printStackTrace();
                        Log.e("Exception", e.getMessage().toString());
                    }

                    Log.v("CONTENT", content);

                    if(response_code.endsWith("200")){
                        //send_msg = "Mail send";
                    }else{
                        //send_msg = "";
                    }
                }
            }
        }catch(Exception e){
            Log.e("Error in _callService", e.getMessage().toString());
        }
    }

以這種方式在按鈕單擊事件上調用：

WebService service = new WebService();
service.execute();

Answer 1

確認INTERNET權限標簽是否是清單標簽的子級，而不是應用程序標簽的子級。 在其他線程中也出現了類似的錯誤。 Android：UnknownHostException

編輯：在該線程中，如果您閱讀了所有答案，則有多個“可能的解決方案”來解決您的錯誤。

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