these ways to set the image to ImageView
imageView.setImageResource(R.drawable.ic_launcher);
or
imageView.setBackground(getResources().getDrawable(R.drawable.ic_launcher));
or
BitmapDrawable drawable = (BitmapDrawable) getResources().getDrawable(R.drawable.ic_launcher);
imageView.setImageBitmap(drawable.getBitmap());