问Android:互联网可以在模拟器中使用，但不能在我的手机上使用

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package com.example.beam;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.Scanner;

import org.apache.http.HttpResponse;
import org.apache.http.client.*;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.support.v4.app.NavUtils;

public class MainActivity extends Activity {

String current = null;
Button check;
TextView text;
TextView url;
String[] lines = new String[12];

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);



    check = (Button) findViewById(R.id.checkstatus);
    text = (TextView) findViewById(R.id.textView1);
    url = (TextView) findViewById(R.id.url);

    String[] lines = new String[12];

    check.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            // Attempt to the read the source from a website.
            String bodyHtml = "null";
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpGet httpGet = new       HttpGet("http://www.spring8.or.jp/ext/ja/status/text.html");
            ResponseHandler<String> resHandler = new BasicResponseHandler();

            try {
                bodyHtml = httpClient.execute(httpGet, resHandler);

            } catch (Exception e) {
                e.printStackTrace();
            }
            double current = 0;
            try{
            String derp = bodyHtml.substring(bodyHtml.lastIndexOf("mA") - 5, bodyHtml.lastIndexOf("mA"));
            current = Double.parseDouble(derp);
            }
            catch(Exception e){

            }
            url.setText(current + " mA");


        }
    });
}