Web画像ブラウザ

Androidではどのようにしてネット上の画像を取得しますか?
手順:
1.画像の経路URLを特定する
2.urlによるhttpリクエストの送信
3.要求方式の設定
4.サーバから返されるレスポンスコードを取得する
5.入力フローを取得してリソースを取得します.
具体的なコードは以下の通りです.

public class MainActivity extends Activity{
	protected static final int CHANGE_UI = 1;
	protected static final int ERROR = 2;
	private EditText et_path;
	private ImageView iv;
	//1.           
	private Handler handler = new Handler(){

		@Override
		public void handleMessage(Message msg) {
			if(msg.what == CHANGE_UI){
				Bitmap bitmap = (Bitmap) msg.obj;
				iv.setImageBitmap(bitmap);
			}else if(msg.what == ERROR){
				Toast.makeText(MainActivity.this, "      ", Toast.LENGTH_SHORT).show();
			}
		}
		
	};
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		et_path = (EditText) findViewById(R.id.et_path);
		iv = (ImageView) findViewById(R.id.iv);
	}
	public void click(View v){
		final String path = et_path.getText().toString().trim();
		if(TextUtils.isEmpty(path))
			Toast.makeText(this, "      ！", Toast.LENGTH_SHORT).show();
		else{
			new Thread(){
				public void run() {
					//      get      
					try {
						URL url = new URL(path);
						//  url  http  
						HttpURLConnection conn = (HttpURLConnection) url.openConnection();
						//      
						conn.setRequestMethod("GET");
						conn.setConnectTimeout(5000);
						conn.setReadTimeout(5000);
						conn.setRequestProperty("User-Agent:", " Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; Tablet PC 2.0)");
						
						//           
						int code = conn.getResponseCode();
						if(code==200){
							InputStream is = conn.getInputStream();
							Bitmap bitmap = BitmapFactory.decodeStream(is);
							//iv.setImageBitmap(bitmap);
							//TODO:                ，  ：bitmap
							Message msg = new Message();
							msg.what = CHANGE_UI;
							msg.obj = bitmap;
							handler.sendMessage(msg);
						}else{
							Message msg = new Message();
							msg.what = ERROR;
							handler.sendMessage(msg);
						}
					} catch (Exception e) {
						e.printStackTrace();
						Message msg = new Message();
						msg.what = ERROR;
						handler.sendMessage(msg);
					}
				};
			}.start();
		}
	}
}