Android – uses the page curl effect of the scrolling page curl library, and the page background is displayed as a black border instead of transparency

Hi, I'm using the harism library for page curl effects（ https://github.com/harism/android_page_curl ）The effect is normal, but there are some transparent parts in the background of my page, which are displayed in black. I have tried in GitHub forum（ https://github.com/harism/android_page_curl/issues/25 ）The solutions mentioned in, But the solution doesn't work properly. You can also query my query there. You can also check the attached screenshot

thank you!

resolvent:

    Comments these lines in the activity
                   r.left += border;
                   r.right -= border;
                   r.top += border;
                   r.bottom -= border;

                    r.left += ((r.width() - imageWidth) / 2) - border;
                    r.right = r.left + imageWidth + border + border;
                    r.top += ((r.height() - imageHeight) / 2) - border;
                    r.bottom = r.top + imageHeight + border + border;
replace this function in the CurlView Activity

public void setMargins(float left, float top, float right, float bottom) {
        mRenderer.setMargins(left, top, right, bottom);
    }