Resize image to full width and variable height with Picasso

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As of Picasso 2.4.0, this operation is now directly supported. Simply add a .resize() request with one of the dimensions as 0. For example, to have a variable width, your call would become:

Picasso.with(this.context)
       .load(message_pic_url)
       .placeholder(R.drawable.profile_wall_picture)
       .resize(0, holder.message_picture.getHeight()),
       .into(holder.message_picture);

Note that this call uses .getHeight() and therefore assumes the message_picture has already been measured. If that isn’t the case, such as when you have inflated a new view in a ListAdapter, you can delay this call until after measurement by adding an OnGlobalLayoutListener to the view:

holder.message_picture.getViewTreeObserver()
      .addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            // Wait until layout to call Picasso
            @Override
            public void onGlobalLayout() {
                // Ensure we call this only once
                imageView.getViewTreeObserver()
                         .removeOnGlobalLayoutListener(this);


                Picasso.with(this.context)
                       .load(message_pic_url)
                       .placeholder(R.drawable.profile_wall_picture)
                       .resize(0, holder.message_picture.getHeight())
                       .into(holder.message_picture);
            }
        });

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