shows me blank with blinking arrow

[sameera liyanage]

This is my main class

package com.aruna.location;


import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import android.telephony.gsm.GsmCellLocation;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class CellID extends Activity implements OnClickListener{
	
	GsmCellLocation location;
    int cellID, lac;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    	super.onCreate(savedInstanceState);
        setContentView(R.layout.main);    
        
        TelephonyManager tm  = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE); 
        location = (GsmCellLocation) tm.getCellLocation();
       
                cellID = location.getCid();
                lac = location.getLac();
                
                Button bt=(Button)findViewById(R.id.displayMap);
                bt.setOnClickListener(this);
    }
    
    private boolean displayMap(int cellID, int lac) throws Exception 
    {
        String urlString = "http://www.google.com/glm/mmap";            
    
        //---open a connection to Google Maps API---
        URL url = new URL(urlString); 
        URLConnection conn = url.openConnection();
        HttpURLConnection httpConn = (HttpURLConnection) conn;        
        httpConn.setRequestMethod("POST");
        httpConn.setDoOutput(true); 
        httpConn.setDoInput(true);
        httpConn.connect(); 
        
        //---write some custom data to Google Maps API---
        OutputStream outputStream = httpConn.getOutputStream();
        WriteData(outputStream, cellID, lac);       
        
        //---get the response---
        InputStream inputStream = httpConn.getInputStream();  
        DataInputStream dataInputStream = new DataInputStream(inputStream);
        
        //---interpret the response obtained---
        dataInputStream.readShort();
        dataInputStream.readByte();
        int code = dataInputStream.readInt();
        if (code == 0) {
            double lat = (double) dataInputStream.readInt() / 1000000D;
            double lng = (double) dataInputStream.readInt() / 1000000D;
            dataInputStream.readInt();
            dataInputStream.readInt();
            dataInputStream.readUTF();
            
            //---display Google Maps---
            String uriString = "geo:" + lat
                + "," + lng;
            Intent intent = new Intent(android.content.Intent.ACTION_VIEW, 
                Uri.parse(uriString));
            startActivity(intent);
            return true;
        }
        else
        {        	
        	return false;
        }
    }  
    
    
    private void WriteData(OutputStream out, int cellID, int lac) 
    throws IOException
    {    	
        DataOutputStream dataOutputStream = new DataOutputStream(out);
        dataOutputStream.writeShort(21);
        dataOutputStream.writeLong(0);
        dataOutputStream.writeUTF("en");
        dataOutputStream.writeUTF("Android");
        dataOutputStream.writeUTF("1.0");
        dataOutputStream.writeUTF("Web");
        dataOutputStream.writeByte(27);
        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(3);
        dataOutputStream.writeUTF("");

        dataOutputStream.writeInt(cellID);  
        dataOutputStream.writeInt(lac);     

        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(0);
        dataOutputStream.flush();    	
    }

	@Override
	public void onClick(View v) {
		
		try {
			displayMap(cellID, lac);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
    
}

this is my main xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=
    "http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    
<Button 
    android:id="@+id/displayMap"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Display map of current location"
    />  

<TextView  
    android:id="@+id/status"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"    
    />

</LinearLayout>

this is my manifest file

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.aruna.location"
      android:versionCode="1"
      android:versionName="1.0">
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>


    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".CellID"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
</manifest>

this is working fine.But after clicking the button it gives me blank screen with blinking arrow.See the attachment.

[sameera liyanage]

can anyone help me ?