En1q0d

Drawable first = imageViewFirst.getDrawable();
Drawable second = imageViewSecond.getDrawable();
Drawable.ConstantState stateFirst = first.getConstantState();
Drawable.ConstantState stateSecond = second.getConstantState();
if(stateFirst.equals(stateSecond)) {
 // ваш код
}

Drawable imageViewDrawable = imageViewFirst.getDrawable();
Drawable.ConstantState imageViewDrawableState =imageViewDrawable.getConstantState();

Drawable fromResourcesDrawable = getResources().getDrawable(R.drawable.my_drawable);// ваш ресурс
Drawable.ConstantState fromResourcesState =  fromResourcesDrawable.getConstantState();

if(imageViewDrawable.equals(fromResourcesState)) {
 // ваш код
}

PercentRelativeLayout.LayoutParams params = (PercentRelativeLayout.LayoutParams)
                myImageView.getLayoutParams();
 PercentLayoutHelper.PercentLayoutInfo info = params.getPercentLayoutInfo();
 info.heightPercent = 0.50f;
 myImageView.requestLayout();