cannot get to load images from a Link in android studio

Question

I have this code, where it gets images from drawables folder. I need to get images form URLs. I think I can do it using Picasso and I tried and I could not nail it.

I have this code in my MainActivity:

public Drawable LoadImageFromWebOperations(String url) {
    try {
        InputStream is = (InputStream) new URL(url).getContent();
        Drawable d = Drawable.createFromStream(is, "image_name");
        return d;
    } catch (Exception e) {
        return null;
    }
}

private Drawable d1 = LoadImageFromWebOperations("http://uupload.ir/files/aud7_brickone.jpg");

private List<App> getApps() {
    List<App> apps = new ArrayList<>();
    apps.add(new App("Google+", d1, 4.6f));
    apps.add(new App("Google+", d1, 4.6f));
    apps.add(new App("Google+", d1, 4.6f));
    apps.add(new App("Google+", d1, 4.6f));
    apps.add(new App("Google+", d1, 4.6f));
    apps.add(new App("Google+", d1, 4.6f));
    apps.add(new App("Google+", d1, 4.6f));
    return apps;
}

and this is my adapter:

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    App app = mApps.get(position);
    holder.imageView.setImageResource(app.getDrawable());
    holder.nameTextView.setText(app.getName());
    holder.ratingTextView.setText(String.valueOf(app.getRating()));
}

and here APP.JAVA

public class App {
    private Drawable mDrawable;
    private String mName;
    private float mRating;

    public App (String name, Drawable drawable, float rating){
        mName = name;
        mDrawable = drawable;
        mRating = rating;
    }

    public float getRating (){return mRating;}
    public Drawable getDrawable (){return mDrawable;}
    public String getName (){return mName;}
}

I need to the images from link like: http://uupload.ir/files/aud7_brickone.jpg

I cannot make it happen!

Answer 1

There are different ways to download an image from an URL. Check the funcion below:

public static Drawable LoadImageFromWebOperations(String url) {
    try {
        InputStream is = (InputStream) new URL(url).getContent();
        Drawable d = Drawable.createFromStream(is, "any_image_name");
        return d;
    } catch (Exception e) {
        return null;
    }
}

Then simply show the returned drawable in your ImageView.

Don't forget to add the internet permissions in your manifest:

<uses-permission android:name="android.permission.INTERNET" />

You could also use this other method, combined with an AsyncTask or a background Thread:

private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
  ImageView bmImage;

  public DownloadImageTask(ImageView bmImage) {
      this.bmImage = bmImage;
  }

  protected Bitmap doInBackground(String url) {
      String urldisplay = url;
      Bitmap mIcon = null;
      try {
        InputStream in = new java.net.URL(urldisplay).openStream();
        mIcon = BitmapFactory.decodeStream(in);
      } catch (Exception e) {
          Log.e("Error", e.getMessage());
          e.printStackTrace();
      }
      return mIcon;
  }

  protected void onPostExecute(Bitmap result) {
      bmImage.setImageBitmap(result);
  }
}

Then you call it wherever you need it with:

new DownloadImageTask((ImageView) findViewById(R.id.imageView))
        .execute("http://uupload.ir/files/aud7_brickone.jpg");

Hope it helps :)