Use IllegaleStateException to be consistent with rest of Bitmap class

            throw new IllegalArgumentException("width and height must be > 0");

        }

        if (!isMutable()) {

            throw new IllegalArgumentException("only mutable bitmaps may be reconfigured");

            throw new IllegalStateException("only mutable bitmaps may be reconfigured");

        }

        if (mBuffer == null) {

            throw new IllegalArgumentException("only non-inPurgeable bitmaps may be reconfigured");

            throw new IllegalStateException("only non-purgeable bitmaps may be reconfigured");

        }

        nativeReconfigure(mNativeBitmap, width, height, config.nativeInt, mBuffer.length);