无法在真实手机（Android）上连接到互联网，但可以在模拟器上运行

Question

My app is working well on emulator, but when it's on real android phone (sony erricsson xperia, sony ericsson xperia mini) it can't connect to internet. Phone has active internet connection using EDGE/GPRS.

Here's the class:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;

public class get_string {


    public String response_p (String url)
    {


            HttpClient client = new DefaultHttpClient();
            HttpGet request = new HttpGet(url.toString());

            ResponseHandler<String> responseHandler = new BasicResponseHandler();
            String response_str = null;
            try {
                response_str = client.execute(request, responseHandler);
            } catch (ClientProtocolException e) {

                response_str="NOT";
            } catch (IOException e) {

                response_str="NOT";
            }

            return response_str;


    }

    public String response (String str)
    {
        String res="";
        try {
            URL url = new URL(str);
            HttpURLConnection con = (HttpURLConnection) url
                .openConnection();
            res=readStream(con.getInputStream());
            } catch (Exception e) {
            res="NOT";
        }



         return res;



    }

    private String readStream(InputStream in) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        String line = "",res="";
        while ((line = reader.readLine()) != null) {
            res+=line;
        }

        return res;
    }




}

Same result for both response() and response_p() .

Here's the manifest file:

        </application>
       <uses-permission android:name="android.permission.INTERNET"></uses-permission>
       <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
       <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" /> 
       <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
   </manifest>

How can I solve this problem?

Answer 1

I moved both response() and response_p() to my default activity class and it worked! I still don't know why but both functions worked perfectly in emulator and real phone.

Answer 2

The problem could be SIM specific or device specific. Try the app using a different SIM card or some other device. This will give a better idea of the problem and the people who want to down vote my answer I still haven't gained a commentator badge, so I'm writing my comment as an answer. It is also possible that your URL is not being fetched by the device.