BmpUtil.java 文件源码

/**
 * 　为指定图片增加阴影
 *
 * @param map    　图片
 * @param radius 　阴影的半径
 * @return bitmap
 */
public static Bitmap drawShadow(Bitmap map, int radius) {
    if (map == null)
        return null;

    BlurMaskFilter blurFilter = new BlurMaskFilter(radius, BlurMaskFilter.Blur.OUTER);
    Paint shadowPaint = new Paint();
    shadowPaint.setMaskFilter(blurFilter);

    int[] offsetXY = new int[2];
    Bitmap shadowImage = map.extractAlpha(shadowPaint, offsetXY);
    shadowImage = shadowImage.copy(Bitmap.Config.ARGB_8888, true);
    Canvas c = new Canvas(shadowImage);
    c.drawBitmap(map, -offsetXY[0], -offsetXY[1], null);
    return shadowImage;
}