Convert a bitmap image from a URL and set it to an ImageView

You can use Universal Image Loader, which does all the heavy lifting for you quickly and effectively.

To implement it in your project is simple:

1) Download .jar in this link and import into the "libs" folder of your project

2) In your Application (if you do not have one, see how to create here ) within the onCreate method, initialize the ImageLoader settings:

...

ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this)
        .threadPriority(Thread.NORM_PRIORITY - 2)
        .threadPoolSize(3)
        .diskCacheExtraOptions(480, 320, null)
        .tasksProcessingOrder(QueueProcessingType.LIFO)
        .build();

ImageLoader.getInstance().init(config);

...

3) To implement within ListView , for example, set your Adapter as follows:

private final DisplayImageOptions options;

public SeuAdapter (List<SeusObjetos> list){
    ...

    options = new DisplayImageOptions.Builder()
        .cacheInMemory(true)
        .cacheOnDisk(true)
        .build();
}

public View getView(int position, View convertView, ViewGroup parent) {

    ...
    String suaUrl = "algumaUrl";
    ImageLoader.getInstance().displayImage(suaUrl, suaImageView, options);
    ...

    return convertView;

}

Of course, you will make the implementations that meet your needs in DisplayImageOptions . Explore library documentation to understand and implement what works best for you.

This is a simple and straightforward way to perform the requested procedure.

1 - Create a folder where your images will be, put this code in the main activity:

if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
             File directory = new File(Environment.getExternalStorageDirectory()+File.separator+"/MeuApp/imagens/");
                directory.mkdirs();

        } 

2 - Create a private method called getBitmapFromURL, to "get" the image from a url:

private Bitmap getBitmapFromURL(String url) {
    try {
        URL src = new URL(url);
        HttpURLConnection connection = (HttpURLConnection) src.openConnection();
        connection.setDoInput(true);
        connection.connect();
        InputStream input = connection.getInputStream();
        Bitmap myBitmap = BitmapFactory.decodeStream(input);
        return myBitmap;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
}

3 - Create a method that will receive the converted Bitmap to save to your device:

private void salvando(Bitmap abmp){

    String file_path = Environment.getExternalStorageDirectory().getAbsolutePath() +
            "/MeuApp/imagens/";
            File dir = new File(file_path);
            if(!dir.exists())
            dir.mkdirs();
            File file = new File(dir, "nomedaImagembaixada");
            FileOutputStream fOut;
            try {
            fOut = new FileOutputStream(file);
            ;
            abmp.compress(Bitmap.CompressFormat.PNG, 85, fOut);
            fOut.flush();
            fOut.close();

            } catch (Exception e) {
            e.printStackTrace();
            }


}

4 - This code will download, as it will pass a return to the salvando() method:

salvando(getBitmapFromURL(www.meusite.com.br/imagens/minhaimagens.png));

5 - NOW IF YOU HAVE A URI!

Uri imagemURI = Uri.parse(Environment.getExternalStorageDirectory().getAbsolutePath() +
                "/MeuApp/imagens/" + "nomedaImagembaixada" );

6 - Finally what you wanted in ImageView:

imgview.setImageUri(imagemURI);

OBS: Caso queira mais de uma imagem: Substitua a 'nomedaImagembaixada' por uma variável do tipo STRING e a 'www.meusite.com.br/imagens/minhaimagens.png', TAMBÉM. Assim, cada valor dado, a ambas as variáveis, servirão para gerar novas imagens.