public Builder setWeight(int weight) {
            if (weight <= 0) {
                throw new IllegalArgumentException("Weight must be > 0");
            }
            this.weight = weight;
            return this;
        }
Sets the weight to use to balance how many Bitmaps of this type are prefilled relative to the other requested
types.
@param weight An integer indicating how to balance pre-filling this size and configuration of
{@link Bitmap} against any other sizes/configurations that may be being pre-filled.
@return This builder.
core/src/main/java/com/bumptech/glide/load/engine/prefill/PreFillType.java