最近在做一个android天气app，没有任何基础，弄出来了一个极为简单的小软件却无法运行，而且没有提示错误，智商很捉急啊，求帮忙

源码如下：
package com.example.w2;

import android.os.Bundle;
import android.app.Activity;
import android.view.View;

import android.widget.*;
import java.io.IOException;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;



public class Main extends Activity{
public static final String PREFS_NAME = "WeatherDataFile";  
SharedPreferences dataofday =null;
private TextView ftdate;
private TextView ftweek;
private TextView ftempe;
private TextView fwinds;
private TextView fweather;
    private Button refresh;
    private String strUrl="http://www.weather.com.cn/weather/101190101.shtml";
    String today; //当前日期
    String dayofweek; //当前星期
    int ftime;//更新时间（整点）
    String date;
    String week;
    String temp;
    String cityname;
    String weather;
    String wind;
   
   
    public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
       ftdate=(TextView)findViewById(R.id.ftdate);
       ftweek=(TextView)findViewById(R.id.ftweek);
   ftempe=(TextView)findViewById(R.id.ftempe);
   fwinds=(TextView)findViewById(R.id.fwinds);
       fweather=(TextView)findViewById(R.id.fweather);
       refresh=(Button)findViewById(R.id.refresh);   
       refresh.setOnClickListener(freshOnClick);
}
private Button.OnClickListener freshOnClick=new Button.OnClickListener(){
   public void onClick(View v) {
   String strResult = connServerForResult(strUrl);
   parseJson(strResult);
             showdata();
           
    }           
     };

   

     private String connServerForResult(String strUrl) {
//获取HttpGet对象
HttpGet httpRequest = new HttpGet(strUrl);
String strResult = "";
try {
// HttpClient对象
HttpClient httpClient = new DefaultHttpClient();
// 获得HttpResponse对象
HttpResponse httpResponse = httpClient.execute(httpRequest);
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
// 取得返回的数据
strResult = EntityUtils.toString(httpResponse.getEntity());
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
if (strResult.charAt(0) != '{')
            strResult = '{' + strResult;
        if (strResult.charAt(strResult.length() - 1) != '}')
            strResult = strResult + '}';
return strResult; //返回结果
};

private void parseJson(String strResult) {
try {
            JSONObject jsonObj = new JSONObject(strResult).getJSONObject("weatherinfo");
            // 打开SharedPreferences更新数据
            Editor write = dataofday.edit();
today = jsonObj.getString("date_y");
dayofweek = jsonObj.getString("week");
ftime = jsonObj.getInt("fchh");
wind =jsonObj.getString("wind");
         write.putInt("ftime", ftime); 
         write.putString("today", today);
         write.putString("dayofweek", dayofweek);
}
    catch (JSONException e) {
        return;
        }
    };

    public void showdata(){   
       ftdate.setText(today);
       ftweek.setText(dayofweek);
       ftempe.setText(temp);
       fweather.setText(weather);  
       fwinds.setText(wind);
}

}
layout/main。xml如下：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background=""
    android:orientation="vertical" >

   
    <LinearLayout
        android:id="@+id/LinearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

         <TextView android:id="@+id/city"
               android:layout_width="fill_parent"
               android:layout_height="fill_parent"  
               android:textColor="blue"        
               android:textSize="25sp"
               android:text="南京天气"
              />  

             <TextView android:id="@+id/ftempe"
               android:layout_width="fill_parent"
               android:layout_height="wrap_content"
               android:paddingLeft="25dp"    
               android:textColor="black"        
               android:textSize="25sp"
               android:text="温度:"
              />  
            <TextView android:id="@+id/fwinds"
               android:layout_width="fill_parent"
               android:layout_height="wrap_content"    
               android:textColor="black"
               android:textSize="25sp"      
               android:text="风力:"
              />
               <TextView
                android:id="@+id/fweather"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.49"
                android:text="天气：晴"
                android:textColor="black"
                android:textSize="25sp" />

                <TextView
                    android:id="@+id/ftdate"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:text="时间：2014年1月1日"
                    android:textColor="black"
                    android:textSize="25sp" />

                <TextView
                    android:id="@+id/ftweek"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:text="星期：星期三"
                    android:textColor="black"
                    android:textSize="25sp" />

        
        <Button
            android:id="@+id/refresh"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/refresh" />
            
          

           </LinearLayout>
    </LinearLayout>
求大神指教！！不胜感激