Convert a bitmap image to a URL and set in Imageview

Question

Well I would like to know how to set a URL in an Imageview variable, I do not know if I was clear?

  private final DisplayImageOptions options;

public NoticiasAdapter(Activity activity, List objects) {
    super(activity, R.layout.noticia_list_item , objects);
    this.activity = activity;
    this.stocks = objects;

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


public View getView(int position, View convertView, ViewGroup parent) {
    View rowView = convertView;
    StockQuoteView sqView = null;

    if(rowView == null)
    {

        LayoutInflater inflater = activity.getLayoutInflater();
        rowView = inflater.inflate(R.layout.noticia_list_item, null);


        sqView = new StockQuoteView();
         //sqView.quote = (TextView) rowView.findViewById(R.id.ticker_symbol);
        sqView.ticker = (TextView) rowView.findViewById(R.id.ticker_price);
        sqView.img  = (ImageView) rowView.findViewById(R.id.img);     

        rowView.setTag(sqView);
    } else {
        sqView = (StockQuoteView) rowView.getTag();
    }



    Noticias currentStock = (Noticias) stocks.get(position);
    String imagem3 = currentStock.getImagem();

    sqView.ticker.setText(currentStock.getTitulo());
    ImageLoader.getInstance().displayImage(imagem3, sqView.img, options);
  return rowView;
}

protected static class StockQuoteView {
    protected TextView ticker;
    protected TextView quote;
    protected ImageView img;
}

Answer 1

This is a simple and direct 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 "grab" 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 execute the download, as it will pass a return to the method salvando():

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

---

5 - NOW YES 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. 

Answer 2

You can utilize the Universal Image Loader, which does all the heavy lifting for you in a fast and effective way.

To implement it in your project is simple:

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

2) In its Application (if you don’t have a, see how to create here) within the method onCreate, initialize the settings for ImageLoader:

...

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 a ListView, for example, configure 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 on DisplayImageOptions. Explore the documentation of this library to understand and implement what suits you best