BaixarImagem.java

public void Clica(View v) {
		final ImageView iv = (ImageView) findViewById(R.id.imageView1);
		new Thread(new Runnable() {
			public void run() {

				final Bitmap imgAux = 
				loadImageFromNetwork("http://targettrust.com.br/img/header-logo_v2.png");
				iv.setImageBitmap(imgAux);
				handler.post(new Runnable() {
					public void run() {
						iv.setImageBitmap(imgAux);
					}
				});
			}

		}).start();
	}
	public Bitmap loadImageFromNetwork(String urlImg) {
		Bitmap img = null;
		try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		try {
			URL url = new URL(urlImg);
			HttpURLConnection conexao = (HttpURLConnection) url
					.openConnection();
			InputStream input = conexao.getInputStream();
			img = BitmapFactory.decodeStream(input);
		} catch (IOException e) {
		}
		return img;
	}