Transformando URL em um Objeto Bitmap[Android]

package br.com.teste;


import java.io.IOException;

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


public class Fotos extends Activity{

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);	
		
		Imagem i = new Imagem();
		try {
			i.baixarImagem("http://upload.wikimedia.org/wikipedia/pt/thumb/b/b4/Corinthians_simbolo.png/230px-Corinthians_simbolo.png");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}
}

package br.com.teste;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class Imagem {
	public Bitmap baixarImagem(String url) throws IOException {

		// definindo a URL
		URL aURL = new URL(url);
		// definindo a conexao
		URLConnection conn = aURL.openConnection();

		// conectando
		conn.connect();

		// pegando a imagem
		InputStream is = conn.getInputStream();

		// criando o buffer
		BufferedInputStream bis = new BufferedInputStream(is);

		// transformando a imagem de stream para um bitmap
		Bitmap bm = null;
		bm = BitmapFactory.decodeStream(bis);

		// fechando os streans
		bis.close();
		is.close();

		return bm;

	}
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="br.com.teste"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-permission android:name="android.permission.INTERNET"></uses-permission>    
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
    <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
    <uses-sdk android:minSdkVersion="3" />
    
	
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity android:name="Fotos">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
            </intent-filter>
        </activity>     
	
    </application>

</manifest>