Android：生成具有资源图像和颜色的 Drawable

Question

I'm using Glide to load image from url and need to have a placeholder which is generated with a transparent pattern stored as a resource and a random background color. Glide allows using Drawable as a placeholder. I have a transparent drawable resource int resId = R.drawable.placeholder; and have Color randomColor = generateRandomColor(); How can I create a Drawable which is created in combination of resource and background random color, smth. like Drawable d = resId + randomColor; ? To have as a result:

Glide.with(getActivity).load(imageUl)
         .asBitmap().placeholder(d)
         .into(imageView); 

Answer 1

You can use the method setColorFilter of Drawable

So the code will be like:

Drawable drawable = getDrawable(resourceId);
drawable.setColorFilter(Color.RED, PorterDuff.Mode.SRC_IN);

Glide.with(getActivity).load(imageUl)
         .asBitmap().placeholder(drawable)
         .into(imageView); 

PorterDuff has a lot of modes , choose the one that's right for you