Android using HttpURLConnection get a network picture

package com.example.android.helloactivity;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.widget.Button;
import android.widget.ImageView;

public class HelloActivity extends Activity {
    /** Called when the activity is first created. */

    String imageUrl = "http://avatar.csdn.net/9/B/9/1_yangmi0313.jpg";
    Bitmap bmImg;
    ImageView imView;

    Button button1;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        imView = new ImageView(this);
        imView.setImageBitmap(returnBitMap(imageUrl));
        setContentView(imView);

    }

    public Bitmap returnBitMap(String url) {
        URL myFileUrl = null;
        Bitmap bitmap = null;
        try {
            myFileUrl = new URL(url);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        try {
            HttpURLConnection conn = (HttpURLConnection) myFileUrl
                    .openConnection();
            conn.setDoInput(true);
            conn.connect();
            InputStream is = conn.getInputStream();
            bitmap = BitmapFactory.decodeStream(is);
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return bitmap;
    }
}

Remember add <uses-permission android:name="android.permission.INTERNET" /> into file AndroidManifest.xml.